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Si10-417

Pocket Manual Service Diagnosis SPLIT & MULTI

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Si10-417

1. Diagnosis by LED ........................2 1.1 Indoor Unit ..................................... 2 1.2 Outdoor Unit .................................. 4

2. Diagnosis by Remote Controller ..6 2.1 To know the error code.................. 6

3. List of applicable models ...........11 3.1 Indoor Units ................................. 11 3.2 Outdoor Units .............................. 17

4. Error Codes and Description of Fault........................................... 21 4.1 Indoor Unit ................................... 21 4.2 Outdoor Unit ................................ 22 4.3 System......................................... 23

5. Troubleshooting ......................... 24 5.1 5.2 5.3 5.4

Contents

Indoor Unit ................................... 24 Outdoor Unit ................................ 35 System....................................... 124 Check ........................................ 149

1

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Diagnosis by LED

Si10-417

1. Diagnosis by LED 1.1 Indoor Unit The operation lamp flashes when any of the following errors is detected. 1. When a protection device of the indoor or outdoor unit is activated or when the thermistor malfunctions, disabling equipment operation. 2. When a signal transmission error occurs between the indoor and outdoor units. In either case, conduct the diagnostic procedure described in the following pages.

Wall Mounted Type

Indicator lamps ON OFF

Operation lamp (green)

Indicator lamps Operation lamp (green)

2

Service Diagnosis

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Si10-417

Diagnosis by LED

Floor Ceiling Suspended Dual Type OPERATION lamp (green)

Floor Standing Type

ON OFF

OPERATION lamp (green)

Duct Connected Type OPERATION lamp (green)

Service Diagnosis

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Diagnosis by LED

Si10-417

1.2 Outdoor Unit Pair

The outdoor unit has one green LED (LED A) on the PCB. The flashing green LED indicates normal condition of microcomputer operation.

4

Service Diagnosis

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Si10-417

Diagnosis by LED

Multi

There are green and red LEDs on the PCB. The flashing green LED indicates normal equipment condition, and the OFF condition of the red LED indicates normal equipment condition. (Troubleshooting with the green LED) The LED A (green) of the outdoor unit indicate microcomputer operation condition. Even after the error is cancelled and the equipment operates in normal condition, the LED indication remains.

Service Diagnosis

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Diagnosis by Remote Controller

Si10-417

2. Diagnosis by Remote Controller 2.1 To know the error code Method 1

6

1. When the timer cancel button is held down for 5 seconds, a “00” indication flashes on the temperature display section.

Service Diagnosis

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Si10-417

Diagnosis by Remote Controller

2. Press the timer cancel button repeatedly until a continuous beep is produced. „ The code indication changes in the sequence shown below, and notifies with a long beep.

Note:

No.

Code

No.

Code

1

00

16

A1

2

U4

17

C4

3

F3

18

C5

4

E6

19

H9

5

L5

20

J6

6

A6

21

UA

7

E5

22

A5

8

LC

23

J9

9

C9

24

E8

10

U0

25

P4

11

E7

26

L3

12

C7

27

L4

13

H8

28

H6

14

J3

29

H7

15

A3

30

U2

1. A short beep and two consecutive beeps indicate noncorresponding codes. 2. To cancel the code display, hold the timer cancel button down for 5 seconds. The code display also cancels itself if the button is not pressed for 1 minute.

Service Diagnosis

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Diagnosis by Remote Controller

Si10-417

Method 2 1. Enter the diagnosis mode. Press the 3 buttons (TEMP simultaneously.

,TEMP

, MODE)

The digit of the number of tens blinks. Try again from the start when the digit does not blink.

2. Press the TEMP button. Press TEMP or TEMP and change the digit until you hear the sound of “beep” or “pi pi”.

8

Service Diagnosis

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Si10-417

Diagnosis by Remote Controller

3. Diagnose by the sound. “ pi ” : The number of tens does not accord with the error code. “ pi pi ” : The number of tens accords with the error code. “ beep ” : The both numbers of tens and units accord with the error code. (→See 7.) 4. Enter the diagnosis mode again. Press the MODE button.

The digit of the number of units blinks.

5. Press the TEMP button. Press TEMP or TEMP and change the digit until you hear the sound of “beep”.

Service Diagnosis

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Diagnosis by Remote Controller

Si10-417

6. Diagnose by the sound. “ pi ” : The both numbers of tens and units do not accord with the error code. “ pi pi ” : The number of tens accords with the error code. “ beep ” : The both numbers of tens and units accord with the error code. 7. Determine the error code. The digits indicated when you hear the “beep” sound are error code. (Error codes and description → Refer to page 21.) 8. Exit from the diagnosis mode. Press the MODE button.

10

Service Diagnosis

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Si10-417

List of applicable models

3. List of applicable models Even the same error code may be explained on different flowchart pages. Follow the classification Nos. in the table below and check the related page according to the table on page 21.

3.1 Indoor Units 3.1.1 Wall Mounted Type Model AT12BV1LS AT18BV1LS ATK25BVMB ATK35BVMB ATKS20CVMB(9) ATKS25BVMB ATKS25CVMB(9) ATKS35BVMB ATKS35CVMB(9) ATX25BVMB ATX35BVMB ATXS20CVMB(9) ATXS25BVMB ATXS25CVMB(9) ATXS35BVMB ATXS35CVMB(9) ATXS50CVMB FT13BV1LS FT18BV1LS FT24BV1LS FT50BVM FT50CV1A FT60BVM FT60CV1A FTK25AVM(A)(T) FTK25AZVMB FTK25BVMB

Classification No. 2 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 1 1 1

Model FTK35AVM(A)(T) FTK35AZVMB FTK35BVMB FTK50AVM(A)(T) FTK60AVM(A)(T) FTK71AVM(A)(T) FTKD18BVMS FTKD24BVMS FTKD28BVMS FTKD50BVM FTKD50BVMA(9) FTKD50BVMD FTKD50BVMT FTKD60BVM FTKD60BVMA(9) FTKD60BVMD FTKD60BVMT FTKD71BVM FTKD71BVMA(9) FTKD71BVMD FTKD71BVMT FTKE09BVMS FTKE12BVMS FTKE25BVM FTKE25BVMA(9) FTKE25BVMD FTKE25BVMT

Classification No. 1 1 1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1

Refer the classification No. to page 21 Service Diagnosis

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List of applicable models

Model FTKE35BVM FTKE35BVMA(9) FTKE35BVMD FTKE35BVMT FTKS20CVMB(9) FTKS25BVMB FTKS25CVMB(9)(8) FTKS35BVMB FTKS35CVMB(9)(8) FTKS50BVMA(9) FTKS50BVMB FTKS60BVMA(9) FTKS60BVMB FTKS71BVMA(9) FTKS71BVMB FTN20CVMB9 FTN25CVMB9 FTN35CVMB9 FTS20BVMB FTS25BVMB FTS35BVMB FTS50BVMB FTS60BVMB FTX25AMVMC FTX25AVMA FTX25AVMC FTX25AVMT FTX25AZVMB FTX25BVMB FTX35AMVMC FTX35AVMA FTX35AVMC FTX35AVMT FTX35AZVMB

Si10-417

Classification No. 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 1 1 1 1 1 1 2 2 1 1 1 1 1 1 1 1 1 1 1

Model FTX35BVMB FTX50AMVMC FTX50AVMA FTX50AVMC FTX50AVMT FTX60AMVMC FTX60AVMA FTX60AVMC FTX60AVMT FTX71AMVMC FTX71AVMA FTX71AVMC FTX71AVMT FTXD50BMVMC FTXD50BV4(9) FTXD50BVMA(9) FTXD50BVMC FTXD50BVMT FTXD50CMV2C FTXD60BMVMC FTXD60BVMA(9) FTXD60BVMC FTXD60BVMT FTXD71BVMA(9) FTXD71BVMC FTXD71BVMT FTXD80CV4(9) FTXE25BMVMC FTXE25BVMA(9) FTXE25BVMC FTXE25BVMT FTXE35BMVMC FTXE35BVMA(9) FTXE35BVMC

Classification No. 1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1

Refer the classification No. to page 21 12

Service Diagnosis

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Si10-417

Model FTXE35BVMT FTXS20CVMB(9) FTXS25BVMB(A) FTXS25CVMB(9)(8) FTXS35BVMB(A) FTXS35CVMB(9)(8) FTXS50BVMA(9) FTXS50BVMB FTXS60BVMA(9) FTXS60BVMB FTXS71BVMA(9)

List of applicable models

Classification No. 1 1 1 1 1 1 2 2 2 2 2

Model FTXS71BVMB FTY25CVMA FTY35CVMA FTYN20CVMB9 FTYN25CVMB9 FTYN35CVMB9 FTYS20BVMB FTYS25BVMB FTYS35BVMB FTYS50BVMB FTYS60BVMB

Classification No. 2 1 1 1 1 1 1 1 1 2 2

Refer the classification No. to page 21

Service Diagnosis

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List of applicable models

Si10-417

3.1.2 Floor Standing Type Classification No. 2 FVK25AZVMB FVK35AZVMB 2 FVK50AZVMB 2 FVKS25BVMB 2 FVKS35BVMB 2 FVKS50BVMB 2 FVX25AZVMB 2 FVX35AZVMB 2 FVX50AZVMB 2 FVX56AV1C 2 FVXD56CMV2C 2 FVXD68CMV2C 2 FVXS25BVMB 2 FVXS35BVMB(A) 2 FVXS50BVMB(A) 2 Model

Refer the classification No. to page 21

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Service Diagnosis

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Si10-417

List of applicable models

3.1.3 Duct Connected Type Model CDK25AVM CDK25AVMA CDK25AVMD CDK25AZVMB CDK35AVM CDK35AVMA CDK35AVMD CDK35AZVMB CDK50AVM CDK50AVMA CDK50AVMD CDK50AZVMB CDK60AVM CDK60AVMA CDK60AVMD CDK60AZVMB CDKD25CVM(A) CDKD35CVM(A) CDKD50CVM(A) CDKD60CVM(A) CDKS25BVMB CDKS25CVMB CDKS35BVMB CDKS35CVMB CDKS50BVMB CDKS50CVMB CDKS60BVMB CDKS60CVMB CDX25AVMA CDX25AZVMB CDX25BVMC(9) CDX35AVMA

Classification No. 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

Model CDX35AZVMB CDX35BVMC(9) CDX50AVMA CDX50AVMC(9) CDX50AZVMB CDX60AVMA CDX60AVMC(9) CDX60AZVMB CDXD25AVMC CDXD25BMVMC CDXD25CMVMC CDXD25CVMA CDXD35AVMC CDXD35BMVMC CDXD35CMVMC CDXD35CVMA CDXD50AVMC CDXD50CVMA CDXD60AVMC CDXD60BMVMC CDXD60CMVMC CDXD60CVMA CDXS25BVMB CDXS25CVMB(A) CDXS35BVMB CDXS35CVMB(A) CDXS50BVMB CDXS50CVMB(A) CDXS60BVMB CDXS60CVMB(A) FDXD50BMVMC FDXD50CMVMC

Classification No. 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

Refer the classification No. to page 21 Service Diagnosis

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List of applicable models

Si10-417

3.1.4 Floor / Ceiling Suspended Dual Type Model FLK25AVMA FLK25AVMD FLK25AZVMB FLK25BVMB FLK35AVMA FLK35AVMD FLK35AZVMB FLK35BVMB FLK50AVMA FLK50AVMD FLK50AZVMB FLK60AVMA FLK60AVMD FLK60AZVMB FLKS25BVMB FLKS35BVMB FLKS50BVMB FLKS60BVMB FLX25AVMA FLX25AZVMB FLX25BVMB FLX35AVMA FLX35AZVMB FLX35BVMB FLX50AVMA FLX50AZVMB FLX60AVMA FLX60AZVMB FLXS25BVMB(A) FLXS35BVMB(A) FLXS50BVMB(A) FLXS60BVMB(A)

Classification No. 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

Refer the classification No. to page 21 16

Service Diagnosis

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Si10-417

List of applicable models

3.2 Outdoor Units Model 2AMKS40BVMB 2AMXS40BVMB 2MK58AVM 2MK58AVM 2MKD58BVM 2MKS40BVMB 2MXS40BVMB 3AMXS52BVMB 3MK58AVM 3MK58AVM 3MK75AVM 3MK75AVM 3MK75AVMA 3MK75AVMT 3MKD58BVM 3MKD75BVM 3MKD75BVMA 3MKD75BVMT 3MKS50BVMB 3MX52AZVMB 3MX68AVMA 3MX68AVMC 3MX68AVMT 3MXD68BVMA 3MXD68BVMC 3MXD68BVMT 3MXD80BMVMC 3MXS52BVMB 4MK58AZVMB 4MK75AVM 4MK75AVM 4MK75AZVMB

Classification No. 6 6 5 5 5 6 6 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5

Model 4MKD75BVM 4MKS58BVMB 4MKS75BVMB 4MX68AZVMB 4MXS68BVMB 4MXS68BVMB9 AR09BV1LS AR25AV1B AR25AV1B9 AR35AV1B AR35AV1B9 ARK25BVMB ARK35BVMB ARKH20CVMB9 ARKH25CVMB9 ARKH35CVMB9 ARKS25BVMB ARKS35BVMB ARX25BVMB ARX35BVMB ARXH20CVMB9 ARXH25CVMB9 ARXH35CVMB9 ARXS25BVMB ARXS35BVMB ARXS50CVMB R25CV1A R25JV16 R25JV17 R25JV1A R35CV1A R35JV16

Classification No. 5 5 5 5 5 5 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 4 3 3 3 3 3 3

Refer the classification No. to page 22 Service Diagnosis

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List of applicable models

Model R35JV17 R35JV1A RE09JV1LS RE12JV1LS RE25JV1 RE25JV1C RE35JV1 RE35JV1C REY22GV1B REY35GV1B RK25BVMB RK25JAVET RK25JV1NB9 RK25JVE9 RK25JVEA9 RK35BVMB RK35JAVET RK35JV1NB9 RK35JVE9 RK35JVEA9 RKD18BVMS RKD24BVMS RKD25KZV1B RKD28BVMS RKD35KZV1B RKD50BVM RKD50BVMA RKD50BVMT RKD50JVE9 RKD50JVEA9 RKD50JVET RKD60BVM RKD60BVMA RKD60BVMT

Si10-417

Classification No. 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 4 4 3 4 3 4 4 4 4 4 4 4 4 4

Model RKD60JVE RKD60JVEA RKD60JVET RKD71BVM RKD71BVMA RKD71BVMT RKD71JVE RKD71JVEA RKD71JVET RKD80BVMA RKE09BVMS RKE12BVMS RKE25BVM RKE25BVMA RKE25BVMT RKE35BVM RKE35BVMA RKE35BVMT RKH20CVMB9 RKH25CVMB9 RKH35CVMB9 RKS25BVMB RKS35BVMB RKS50BVMA RKS50BVMB RKS50BVMB9 RKS60BVMA RKS60BVMB RKS60BVMB9 RKS71BVMA RKS71BVMB RKS71BVMB9 RN20CVMB9 RN25CVMB9

Classification No. 4 4 4 4 4 4 4 4 4 4 3 3 3 3 3 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 4 3 3

Refer the classification No. to page 22 18

Service Diagnosis

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Si10-417

Model RN35CVMB9 RS20BVMB RS25BVMB RS35BVMB RS50BVMB RS50BVMB RS60BVMB RX25BVMB RX25JAVET RX25JV1NB5 RX25JV1NB9 RX25JVEA9 RX25LV1C RX25LV1C9 RX35BVMB RX35JAVET RX35JV1NB5 RX35JV1NB9 RX35JVEA9 RX35LV1C RX35LV1C9 RX50AZVMB RX50JV4N RX56AV1C RX60AZVMB RX71AZVMB RXD25KZV1B RXD35KZV1B RXD50BMVMC RXD50BV4 RXD50BVMA RXD50BVMT RXD50CMVMC RXD50JV1B

List of applicable models

Classification No. 3 3 3 3 4 4 4 3 3 3 3 3 3 3 3 3 3 3 3 3 3 4 4 4 4 4 3 3 4 4 4 4 4 4

Model RXD50JV1B RXD50JV1B5 RXD50JVEA9 RXD50JVET RXD60BVMA RXD60BVMT RXD60JV1B RXD60JV1B5 RXD60JVEA RXD60JVET RXD68CMV2C RXD71BMVMC RXD71BVMA RXD71BVMT RXD71JV1B RXD71JV1B5 RXD71JVEA RXD71JVET RXD80BVMA RXD80CV4 RXE25BVMA RXE25BVMT RXE25CMV2C RXE35BVMA RXE35BVMT RXE35CMV2C RXH20CVMB9 RXH25CVMB9 RXH35CVMB9 RXS25BVMB RXS35BVMB RXS35BVMB RXS50BVMA RXS50BVMB

Classification No. 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 3 3 3 3 3 3 3 3 3 3 3 3 4 4

Refer the classification No. to page 22 Service Diagnosis

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List of applicable models

Model RXS60BVMA RXS60BVMB RXS71BVMA RXS71BVMB RY25CVMA RY35CVMA RYN20CVMB9

Si10-417

Classification No. 4 4 4 4 3 3 3

Model RYN25CVMB9 RYN35CVMB9 RYS20BVMB RYS25BVMB RYS35BVMB RYS50BVMB RYS60BVMB

Classification No. 3 3 3 3 3 4 4

Refer the classification No. to page 22

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Service Diagnosis

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Si10-417

Error Codes and Description of Fault

4. Error Codes and Description of Fault 4.1 Indoor Unit Code Indication Description of Problem

Classification No. and related page 1

2

A1

Indoor unit PCB abnormality

24

24

A5

Freeze-up protection function or high pressure control

25

25

A6

Fan motor or related abnormality

27

29

C4

Heat exchanger temperature thermistor abnormality Shutter drive motor / shutter limit switch abnormality Room temperature thermistor abnormality

32

32

33

33

32

32

C7 C9

Service Diagnosis

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Error Codes and Description of Fault

Si10-417

4.2 Outdoor Unit Code Indication Description of Problem

Classification No. and related page 3

4

5

6

Anti-icing function

—

—

—

35

Freeze-up protection

—

—

37

—

E5

OL activation (compressor overloaded)

39

40

41

39

E6

Compressor lock

43

44

45

47

E7

DC fan lock

—

48

49

48

E8

Input over current detection

50

52

54

56

EA

Four way valve abnormality

58

60

62

64

F3

Discharge pipe temperature control

66

68

70

72

F6

High pressure control in cooling

74

74

—

75

H6

Position sensor abnormality

77

79

81

83

H8

CT or related abnormality

85

87

89

91

H9

93

93

95

97

93

93

95

97

93

93

95

97

—

—

95

97

J9

Outdoor air thermistor or related abnormality Discharge pipe thermistor or related abnormality Heat exchanger thermistor or related abnormality Liquid pipe thermistor or related abnormality Gas pipe thermistor or related abnormality

—

—

95

97

L3

Electrical box temperature rise

99

101

103

105

L4

Radiation fin temperature rise

107

109

111

113

L5

Output over current detection

115

115

118

121

P4

Radiation fin thermistor or related abnormality

93

93

95

97

A5

J3 J6 J8

22

Service Diagnosis

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Si10-417

Error Codes and Description of Fault

4.3 System Code Indication Description of Problem

00

Normal

U0

Insufficient gas

U2

3

4

5

6

—

—

—

—

124

127

130

133

Low-voltage detection

—

137

138

—

Over-voltage detection

136

—

—

140

142

142

—

142

—

—

144

—

146

146

147

148

—

—

147

148

UA

Signal transmission error (between indoor and outdoor units) Outdoor unit PCB abnormality or signal transmission circuit abnormality Unspecified voltage (between indoor and outdoor units)

UH

Anti-icing function in other rooms

U4

Classification No. and related page

Service Diagnosis

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Troubleshooting

Si10-417

5. Troubleshooting 5.1 Indoor Unit 5.1.1 Indoor Unit PCB Abnormality Remote Controller Display

A1

Method of Malfunction Detection

Evaluation of zero-cross detection of power supply by indoor unit.

Malfunction Decision Conditions

When there is no zero-cross detection in approximately 10 continuous seconds.

Supposed Causes

„ Faulty indoor unit PCB „ Faulty connector connection

Trouble shooting

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Connector connection check (note).

Is it normal?

NO

YES

Correct connections. Replace PCBs. (R1400)

Note:

Connector Nos. vary depending on models. Control connector Model Type Wall Mounted Type 20/25/35 class

Connector No. Terminal strip~Control PCB

Wall Mounted Type 50/60/71 Terminal strip~Control PCB class Ceiling Embedded Duct Type Terminal strip~Control PCB

24

Duct Connected Type

Terminal strip~Control PCB

Floor / Ceiling Suspended Dual Type

S37

Floor Standing Type

Control PCB : S7, S201, S203 Power Supply PCB : S8, S202, S204

Service Diagnosis

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Si10-417

Troubleshooting

5.1.2 Freeze-up Protection Control or High Pressure Control Remote Controller Display

A5

Method of Malfunction Detection

„ High pressure control (heat pump model only)

Malfunction Decision Conditions

„ High pressure control

Supposed Causes

„ Operation halt due to clogged air filter of the indoor

During heating operations, the temperature detected by the indoor heat exchanger thermistor is used for the high pressure control (stop, outdoor fan stop, etc.) „ The freeze-up protection control (operation halt) is activated during cooling operation according to the temperature detected by the indoor unit heat exchanger thermistor.

During heating operations, the temperature detected by the indoor heat exchanger thermistor is above 65°C „ Freeze-up protection When the indoor unit heat exchanger temperature is below 0°C during cooling operation.

unit.

„ Operation halt due to dust accumulation on the indoor

unit heat exchanger.

„ Operation halt due to short-circuit. „ Detection error due to faulty indoor unit heat

exchanger thermistor.

„ Detection error due to faulty indoor unit PCB.

Service Diagnosis

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Troubleshooting

Trouble shooting

Si10-417

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Check the air passage.

Check No.6 Refer to P.157

Is there any short-circuit?

YES

Provide sufficient air passage.

NO Check the intake air filter.

Is it very dirty?

YES

Clean the air filter.

NO Check the dust accumulation on the indoor unit heat exchanger. Is it very dirty?

YES

NO

Clean the heat exchanger.

Check No. 6 Indoor unit heat exchanger thermistor check Does it conform to the thermistor characteristic chart? NO

Note:

26

YES

Replace the indoor unit PCB.

Replace the thermistor (replace the indoor unit PCB). (R1401)

If the outside temperature is below –10°C in the cooling mode, the system may get interrupted with error A5 displayed. The system will be reset itself, but this stop will be put in the error history memory.

Service Diagnosis

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Si10-417

Troubleshooting

5.1.3 Fan Motor (AC Motor) or Related Abnormality Remote Controller Display

A6

Method of Malfunction Detection

The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor operation.

Malfunction Decision Conditions

When the detected rotation speed is less than 50% of the HH tap under maximum fan motor rotation demand.

Supposed Causes

„ Operation halt due to short circuit inside the fan motor

winding.

„ Operation halt due to breaking of wire inside the fan

motor.

„ Operation halt due to breaking of the fan motor lead

wires.

„ Operation halt due to faulty capacitor of the fan motor. „ Detection error due to faulty indoor unit PCB.

Trouble shooting

Be sure to turn off power switch before connect or Caution disconnect connector, or parts damage may be occurred. Operate the fan.

Check No.16 Refer to P.167

Does it rotate?

YES

A

NO Rotate the fan by hand.

Does it rotate smoothly?

NO

YES Check the fan motor voltage. (immediately after re-start)

Is it at the rated voltage?

NO

Replace the fan motor ∗2 Measure the voltage between the red and black lead wires of the fan motor, and check if the maximum voltage reaches the rated voltage. Replace the indoor unit PCB (1)

YES Check the capacitor's conductivity Is there conductivity? NO

Service Diagnosis

YES

Replace the capacitor. (Replace PCB (1).) Replace the fan motor.

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Troubleshooting

Si10-417

A Check No. 16 Check hall IC Is there an output?

NO

Replace the fan motor or indoor unit PCB.

YES Check the fan motor voltage. Is it at the rated voltage? YES

28

NO

Replace indoor unit PCB (1). Replace the fan motor. (R1946)

Service Diagnosis

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Si10-417

Troubleshooting

5.1.4 Fan Motor (DC Motor) or Related Abnormality Remote Controller Display

A6

Method of Malfunction Detection

The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor operation.

Malfunction Decision Conditions

When the detected rotation speed is less than 50% of the H tap under maximum fan motor rotation demand.

Supposed Causes

„ Operation halt due to short circuit inside the fan motor

winding.

„ Operation halt due to breaking of wire inside the fan

motor.

„ Operation halt due to breaking of the fan motor lead

wires.

„ Operation halt due to faulty capacitor of the fan motor. „ Detection error due to faulty indoor unit PCB (1).

Service Diagnosis

29

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Troubleshooting

Trouble shooting

Si10-417

Be sure to turn off power switch before connect or Caution disconnect connector, or parts damage may be occurred. Turn off power supply and rotate fan by hand.

Check No.1 Refer to P.149

Does fan rotate smoothly?

NO

Replace fan motor.

YES

Check No.2 Refer to P.150

Turn power ON and operate fan.

Does it rotate?

NO

A

YES Stop fan motor. Check No.01 Check output of fan motor connector

Is rotation number command pulse generated? YES

30

NO

Replace indoor Replace fan motor.

Replace indoor unit PCB (2) .

Service Diagnosis

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Si10-417

Troubleshooting

A

Turn off power supply and disconnect fan motor connector, then turn power ON. Check No.01 Check output of fan motor connector Is motor power voltage DC 200V generated?

NO

Replace indoor unit PCB (1) .

YES Is motor control power voltage DC 15V generated?

NO

B

YES Turn off power supply and disconnect fan motor connector, then turn power ON again. Check No.01 Check output of fan motor connector

Is rotation number command voltage DC 5V generated?

YES

NO Check No.01 Check output of fan motor connector Is rotation number command pulse generated?

NO

YES

Replace fan motor. Note : Motor may break when the motor connector is disconnected while remaining power supply. Replace fan motor and indoor PCB (2) . Replace indoor unit PCB (2) .

B Check No.02 Check output of indoor unit PCB (1)

Is motor control power voltage DC 16V generetad? YES

Service Diagnosis

NO

Replace indoor unit PCB (1) . Replace indoor unit PCB (2) . (R1214)

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Troubleshooting

Si10-417

5.1.5 Thermistor or Related Abnormality (Indoor Unit) Remote Controller Display

C4, C9

Method of Malfunction Detection

The temperatures detected by the thermistors are used to determine thermistor errors.

Malfunction Decision Conditions

When the thermistor input is more than 4.96 V or less than 0.04 V during compressor operation*. * (reference) When above about 212°C (less than 120 ohms) or below about -50°C (more than 1,860 kohms).

Note:

Supposed Causes Trouble shooting

The values vary slightly in some models.

„ Faulty connector connection „ Faulty thermistor „ Faulty PCB

Be sure to turn off power switch before connect or Caution disconnect connector, or parts damage may be occurred. Check the connector connection.

Check No.6 Refer to P.157

Is it normal?

NO

Correct the connection.

YES Check No. 6 Thermistor resistance check

Is it normal? YES

NO

Replace the thermistor. (Replace the indoor unit PCB.) Replace the indoor unit PCB. (R1403)

C4 : Heat exchanger temperature thermistor C9 : Room temperature thermistor

32

Service Diagnosis

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Si10-417

Troubleshooting

5.1.6 Shutter Drive Motor / Shutter Limit Switch Abnormality Remote Controller Display

C7

Method of Malfunction Detection

The shutter open / close performance is detected by the limit switch attached on its structure. In this way, the shutter drive motor and the shutter limit switch are checked for failure.

Malfunction Decision Conditions

When the shutter is open, the limit switch is closed.

Supposed Causes

„ „ „ „ „

Shutter drive motor defective Shutter limit switch defective Shutter itself deformed (warped) Shutter's sealing material too thick Detection error by broken relay harness or disconnected connector „ Detection error due to defective PCB (2) „ Foreign substance in blow port

Trouble shooting

Be sure to turn off power switch before connect or Caution disconnect connector, or parts damage may be occurred. Turn off the power.

Check No.3 Refer to P.150

Foreign substance in the shutter structure?

YES

Remove such substance.

NO Check No. 3 Check the limit switch continuity.

Limit switch on power?

NO

Replace the limit switch.

YES Open the shutter and turn on the power.

Shutter closed?

NO

A

YES 2A

Service Diagnosis

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Troubleshooting

Si10-417

2A

Shutter opening itself?

YES

NO

Check the shutter's sealing material. Check the shutter for deformation or its sealing material.

A

Relay harness broken or connector disconnected? NO

YES

Reconnect the connector or replace the relay harness. Replace the shutter drive motor or the PC board (2). (Q0346)

34

Service Diagnosis

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Si10-417

Troubleshooting

5.2 Outdoor Unit 5.2.1 Anti-icing Function Remote Controller Display

A5

Method of Malfunction Detection

Indoor unit icing, during cooling operation, is detected by checking the temperatures sensed by the indoor unit heat exchanger temperature thermistor and room temperature thermistor that are located in a shut-down room. At another room (the indoor unit is normal), “UH” is displayed on the remote controller.

Malfunction Decision Conditions

In the cooling mode, the following conditions (A) and (B) are kept together for 5 minutes. (A) Indoor unit heat exchanger temperature ≤ –1°C (B) Indoor unit heat exchanger temperature ≤ Room temperature –10°C „ If the indoor unit anti-icing function is activated four times continuity, the system will be shut down. (The 4-time counter will reset itself if any of the following errors does not occur during the compressor running time (total time): OL, radiation fin temperature rise, insufficient gas, and compressor lock.)

Supposed Causes

„ „ „ „

Wrong wiring or piping Ev malfunctioning in each room Short-circuit Indoor unit heat exchanger temperature thermistor abnormality „ Room temperature thermistor abnormality

Service Diagnosis

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Troubleshooting

Trouble shooting

Si10-417

Be sure to turn off power switch before connect or Caution disconnect connector, or parts damage may be occurred. Check the wiring and piping.

Check No.4 Refer to P.151

Check No.6 Refer to P.157

Wiring or piping out of spec?

YES

Correct the wiring or piping error.

NO Check No. 4 Check the electronic expansion valve.

Normal?

NO

Replace the defective Ev or coil.

YES Check No. 6 Check the outdoor unit heat exchanger thermistor.

Thermistor NO as specified in its characteristic chart? YES Check No. 6 Check the room temperature thermistor. Thermistor NO as specified in its characteristic chart? YES Change the gas to let moisture out of the unit (after drawing a vacuum).

Error again?

NO

YES

Replace the heat exchanger thermistor.

Replace the room temperature thermistor.

Replace the room temperature thermistor or indoor unit heat exchanger thermistor. Do the vacuumdrying. Replace the indoor unit PCB. (R3039)

36

Service Diagnosis

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Si10-417

Troubleshooting

5.2.2 Freeze-up Protection Control Remote Controller Display

A5

Outdoor Unit LED Display

A5 14 21 34 44

Method of Malfunction Detection

Indoor unit icing, during cooling operation, is detected by checking the temperatures sensed by the indoor unit heat exchanger thermistor and room temperature thermistor that are located in a shut-down room.

Malfunction Decision Conditions

In the cooling mode, the following conditions (A) and (B) are kept together for 5 minutes. (A) Indoor unit heat exchanger temperature ≤ –1°C (B) Indoor unit heat exchanger temperature ≤ Room temperature –10°C „ If the indoor unit icing protector is activated four times straight, the system will be shut down. (The 4-time counter will reset itself if any of the following errors does not occur during the compressor running time (total time): OL, radiation fin temperature rise, gas shortage, and compressor startup.)

Supposed Causes

„ „ „ „ „

Service Diagnosis

Wrong wiring or piping Ev malfunctioning in each room Short-circuit Indoor unit heat exchanger thermistor defective Indoor unit thermistor defective

37

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Troubleshooting

Trouble shooting

Si10-417

Be sure to turn off power switch before connect or Caution disconnect connector, or parts damage may be occurred. Check the wiring and piping.

Check No.4 Refer to P.151

Check No.6 Refer to P.157

Wiring or piping out of spec?

YES

Activate the wiring error check mode.

NO Check No. 4 Check the electronic expansion valve.

Motor functioning?

NO

Replace the defective Ev or coil.

YES Check No. 6 Check the outdoor unit heat exchanger thermistor.

Thermistor NO as specified in its characteristic chart? YES Check No. 6 Check the room temperature thermistor. Thermistor NO as specified in its characteristic chart? YES Change the gas to let moisture out of the unit (after drawing a vacuum).

Error again?

NO

YES

Replace the heat exchanger thermistor.

Replace the room temperature thermistor.

Replace the room temperature thermistor or indoor unit heat exchanger thermistor. Do the vacuum-drying.

Replace the indoor unit PCB and then start the wiring error check mode. (R3059)

38

Service Diagnosis

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Si10-417

Troubleshooting

5.2.3 OL Activation (Compressor Overload) Remote Controller Display

E5

Method of Malfunction Detection

A compressor overload is detected through compressor OL.

Malfunction Decision Conditions

„ If the compressor OL is activated twice, the system

Supposed Causes

„ „ „ „ „ „

will be shut down.

„ The error counter will reset itself if this or any other

error does not occur during the following 60-minute compressor running time (total time). * The operating temperature condition is not specified.

Trouble shooting

Check No.4 Refer to P.151

Refrigerant shortage Four way valve malfunctioning Outdoor unit PCB defective Water mixed in the local piping Electronic expansion valve defective Stop valve defective Be sure to turn off power switch before connect or Caution disconnect connector, or parts damage may be occurred. Discharge pipe thermistor disconnected?

Insert the thermistor in position.

NO Check No. 6 Check the thermistors

Check No.5-2 Refer to P.156

YES

Functioning Check No. 4 Check the electronic expantion valve.

Malfunctioning ∗ Discharge pipe thermistor Malfunctioning

Replace the discharge pipe thermistor.

Replace the valve itself or the coil.

Functioning

Check No.6 Refer to P.157

Check No.11 Refer to P.162

Service Diagnosis

Check No. 5-2 Check the four way valve.

Malfunctioning

Functioning Check No. 11 Check the refrigerant line.

Functioning

Replace the four way valve coil or the valve itself. Replace the outdoor unit PCB.

Malfunctioning

Refer to the refrigerant ∗ Refrigerant line check procedure. shortage ∗ Water mixed ∗ Stop valve defective Replace the outdoor unit PCB. (R2841)

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Troubleshooting

Si10-417

5.2.4 OL Activation (Compressor Overload) Remote Controller Display

E5

Method of Malfunction Detection

A compressor overload is detected through compressor OL.

Malfunction Decision Conditions

„ If the compressor OL is activated twice, the system

Supposed Causes

„ „ „ „ „ „

Trouble shooting

Check No.4 Refer to P.151

will be shut down.

„ The error counter will reset itself if this or any other

error does not occur during the following 60-minute compressor running time (total time). * The operating temperature condition is not specified. Refrigerant shortage Four way valve malfunctioning Outdoor unit PCB defective Water mixed in the local piping Electronic expansion valve defective Stop valve defective Be sure to turn off power switch before connect or Caution disconnect connector, or parts damage may be occurred. Discharge pipe thermistor disconnected?

Insert the thermistor in position.

NO Check No. 6 Check the thermistors

Check No.5-1 Refer to P.155

YES

Functioning Check No. 4 Check the electronic expantion valve.

Malfunctioning ∗ Discharge pipe thermistor Malfunctioning

Replace the discharge pipe thermistor.

Replace the valve itself or the coil.

Functioning

Check No.6 Refer to P.157

Check No.11 Refer to P.162

40

Check No. 5-1 Check the four way valve.

Malfunctioning

Functioning Check No. 11 Check the refrigerant line.

Functioning

Replace the four way valve coil or the valve itself. Replace the outdoor unit PCB.

Malfunctioning

Refer to the refrigerant ∗ Refrigerant line check procedure. shortage ∗ Water mixed ∗ Stop valve defective Replace the outdoor unit PCB. (R2841)

Service Diagnosis

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Si10-417

Troubleshooting

5.2.5 OL Activation (Compressor Overload) Remote Controller Display

E5

Outdoor Unit LED Display

A5 14 21 34 41

Method of Malfunction Detection

A compressor overload is detected through compressor OL.

Malfunction Decision Conditions

„ If the compressor OL is activated twice, the system

Supposed Causes

„ „ „ „ „ „

will be shut down.

„ The error counter will reset itself if this or any other

error does not occur during the following 60-minute compressor running time (total time). * The operating temperature condition is not specified.

Service Diagnosis

Refrigerant shortage Four way valve malfunctioning Outdoor unit PCB defective Water mixed in the local piping Electronic expansion valve defective Shut-off valve defective

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Troubleshooting

Trouble shooting

Check No.4 Refer to P.151

Si10-417

Be sure to turn off power switch before connect or Caution disconnect connector, or parts damage may be occurred. Discharge pipe thermistor disconnected?

Insert the thermistor in position.

NO Check No. 6 Check the thermistors

Check No.5-1 Refer to P.155

YES

Functioning Check No. 4 Check the electronic expantion valve.

Malfunctioning ∗ Discharge pipe thermistor Malfunctioning

Replace the discharge pipe thermistor.

Replace the valve itself or the coil.

Functioning

Check No.6 Refer to P.157

Check No.11 Refer to P.162

42

Check No. 5-1 Check the four way valve.

Malfunctioning

Functioning Check No. 11 Check the refrigerant line.

Functioning

Replace the four way valve coil or the valve itself. Replace the outdoor unit PCB.

Malfunctioning

Refer to the refrigerant ∗ Refrigerant line check procedure. shortage ∗ Water mixed ∗ Stop valve defective Replace the outdoor unit PCB. (R2841)

Service Diagnosis

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Si10-417

Troubleshooting

5.2.6 Compressor Lock Remote Controller Display

E6

Method of Malfunction Detection

A compressor lock is detected by checking the compressor running condition through the position detection circuit.

Malfunction Decision Conditions

„ The system judges the compressor lock, and stops

Supposed Causes

„ Compressor locked

due to over current.

„ The system judges the compressor lock, and cannot

operation with position detection within 15 seconds after start up. „ The system will be shut down if the error occurs 16 times. „ Clearing condition: Continuous run for about 5 minutes (normal)

Trouble shooting

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Turn off the power. Disconnect the harnesses U, V and W. ∗ Inverter checker Part No.: 1225477

Check with the inverter checker (∗).

Normal?

NO

YES Turn off the power and reconnect the harnesses. Turn on the power again and get the system restarted.

Emergency stop without compressor running?

YES

Correct the power supply or replace the SPM. (Replace the outdoor unit PCB.)

Replace the compressor.

NO System shut down after errors repeated several times? YES

Note:

NO

Check the electronic expansion valve. Replace it as required. Replace the compressor. (R2842)

If the model doesn’t have SPM, replace the outdoor unit PCB.

Service Diagnosis

43

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Troubleshooting

Si10-417

5.2.7 Compressor Lock Remote Controller Display

E6

Method of Malfunction Detection

A compressor lock is detected by checking the compressor running condition through the position detection circuit.

Malfunction Decision Conditions

„ The position detection circuit detects a compressor

Supposed Causes

„ Compressor locked

Trouble shooting

frequency of below 10 Hz for 20 seconds or a frequency of above 160 Hz. „ 40 seconds after the compressor has started, the position detection circuit detects a compressor frequency of above 180 Hz. „ The system will be shut down if the error occurs 16 times. „ Clearing condition: Continuous run for about 5 minutes (normal)

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Turn off the power. Disconnect the harnesses U, V and W. ∗ Inverter checker Part No.: 1225477

Check with the inverter checker (∗).

Normal?

NO

YES Turn off the power and reconnect the harnesses. Turn on the power again and get the system restarted.

Emergency stop without compressor running?

YES

Correct the power supply or replace the SPM. (Replace the outdoor unit PCB.)

Replace the compressor.

NO System shut down after errors repeated several times? YES

44

NO

Check the electronic expansion valve. Replace it as required. Replace the compressor. (R2842)

Service Diagnosis

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Si10-417

Troubleshooting

5.2.8 Compressor Lock Remote Controller Display

E6

Outdoor Unit LED Display

A5 11 24 34 41

Method of Malfunction Detection

A compressor lock is detected by checking the compressor running condition through the position detection circuit.

Malfunction Decision Conditions

„ The position detection circuit detects a compressor

Supposed Causes

„ Compressor locked

frequency of below 10 Hz for 20 seconds or a frequency of above 160 Hz. „ 40 seconds after the compressor has started, the position detection circuit detects a compressor frequency of above 180 Hz. „ The system will be shut down if the error occurs 16 times. „ Clearing condition: Continuous run for about 5 minutes (normal)

Trouble shooting

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Caution

Turn off the power. Disconnect the harnesses U, V and W. ∗ Inverter checker Part No.: 1225477

Check with the inverter checker (∗).

Normal?

NO

YES Turn off the power and reconnect the harnesses. Turn on the power again and get the system restarted.

Emergency stop without compressor running?

YES

Correct the power supply or replace the SPM. (Replace the outdoor unit PCB.)

Replace the compressor.

NO A

Service Diagnosis

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Troubleshooting

Si10-417

A

System shut down after errors repeated several times? YES

NO

Check the electronic expansion valve. Replace it as required. Replace the compressor. (R2842)

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Service Diagnosis

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Si10-417

Troubleshooting

5.2.9 Compressor Lock Remote Controller Display

E6

Method of Malfunction Detection

A compressor lock is detected by checking the compressor running condition through the position detection circuit.

Malfunction Decision Conditions

„ The position detection circuit detects a compressor

frequency of below 5 Hz for several tens of seconds.

„ The system will be shut down if the error occurs 16

times.

„ Clearing condition: Continuous run for about 5

minutes (normal) Supposed Causes

„ Compressor locked

Trouble shooting

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Turn off the power. Disconnect the harnesses U, V and W. ∗ Inverter checker Part No.: 1225477

Check with the inverter checker (∗).

Normal?

NO

YES Turn off the power and reconnect the harnesses. Turn on the power again and get the system restarted.

Emergency stop without compressor running?

YES

Correct the power supply or replace the SPM. (Replace the outdoor unit PCB.)

Replace the compressor.

NO System shut down after errors repeated several times? YES

Note:

NO

Check the electronic expansion valve. Replace it as required. Replace the compressor. (R2842)

If the model doesn't have SPM, replace the outdoor unit PCB.

Service Diagnosis

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Troubleshooting

Si10-417

5.2.10 DC Fan Lock Remote Controller Display

E7

Method of Malfunction Detection

A fan motor or related error is detected by checking the high-voltage fan motor rpm being detected by the hall IC.

Malfunction Decision Conditions

„ The fan does not start in 30 seconds even when the

fan motor is running.

„ The system will be shut down if the error occurs 16

times.

„ Clearing condition: Continuous run for about 5

minutes (normal) Supposed Causes

„ Fan motor breakdown „ Harness or connector disconnected between fan

motor and PCB or in poor contact

„ Foreign matters stuck in the fan

Trouble shooting

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Fan motor connector disconnected?

Check No.15-1·2 Refer to P.165

YES

NO Foreign matters in or around the fan? NO

YES

Turn off the power and reconnect the connector. Remove.

Get started. Check No. 15-1·2 Check the outdoor unit PCB rpm pulse input. Pulse signal inputted?

NO

Replace the outdoor unit fan motor.

YES Replace the outdoor unit PCB. (R2843)

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Service Diagnosis

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Si10-417

Troubleshooting

5.2.11 DC Fan Lock Remote Controller Display

E7

Outdoor Unit LED Display

A5 14 24 34 44

Method of Malfunction Detection

A fan motor line error is detected by checking the highvoltage fan motor rpm being detected by the Hall IC.

Malfunction Decision Conditions

„ The fan does not start in 30 seconds even when the

fan motor is running.

„ The system will be shut down if the error occurs 16

times.

„ Clearing condition: Continuous run for about 5

minutes (normal) Supposed Causes

„ Fan motor breakdown „ Harness or connector disconnected between fan

motor and PCB or in poor contact

„ Foreign matters stuck in the fan

Trouble shooting

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Fan motor connector disconnected?

Check No.15-1·2 Refer to P.165

YES

NO Foreign matters in or around the fan? NO

YES

Turn off the power and reconnect the connector. Remove.

Get started. Check No. 15-1·2 Check the outdoor unit PCB rpm pulse input. Pulse signal inputted?

NO

Replace the outdoor unit fan motor.

YES Replace the outdoor unit PCB. (R2843)

Service Diagnosis

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Troubleshooting

Si10-417

5.2.12 Input Over Current Detection Remote Controller Display

E8

Method of Malfunction Detection

An input over-current is detected by checking the input current value being detected by CT with the compressor running.

Malfunction Decision Conditions

„ The following CT input with the compressor running

Supposed Causes

„ „ „ „ „

Trouble shooting

Check No.7-1 Refer to P.158

Check No.8 Refer to P.160

continues for 2.5 seconds. Cooling: Above 11A, Heating: Above 13A Over-current due to compressor failure Over-current due to defective power transistor Over-current due to defective outdoor unit PCB Error detection due to outdoor unit PCB Over-current due to short-circuit

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

∗ An input over-current may result from wrong internal wiring. If the wires have been disconnected and reconnected for part replacement, for example, and the system is interrupted by an input over-current, take the following procedure. Get restarted and measure the input current. Input current flowing above its stop level?

NO

YES Turn off the power and disconnect the harnesses U, V and W. ∗ Inverter checker Part No.: 1225477

Check with the inverter checker (∗).

Any LED off? NO A

50

Replace the outdoor unit PCB.

YES

Correct the power supply or replace the SPM. (Replace the outdoor unit PCB.)

Service Diagnosis

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Si10-417.fm Page 51 Wednesday, September 22, 2004 6:38 PM

Si10-417

Troubleshooting

A

Turn off the power, and reconnect the harnesses. Turn on the power again and get restarted. Check No. 8 Check the discharge pressure.

Check No. 7-1 Check the installation condition. (R2952)

Note:

If the model doesn’t have SPM, replace the outdoor unit PCB.

Service Diagnosis

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Si10-417.fm Page 52 Wednesday, September 22, 2004 6:38 PM

Troubleshooting

Si10-417

5.2.13 Input Over Current Detection Remote Controller Display

E8

Method of Malfunction Detection

An input over-current is detected by checking the input current value being detected by CT with the compressor running.

Malfunction Decision Conditions

„ The following CT input with the compressor running

Supposed Causes

„ Over-current due to compressor failure „ Over-current due to defective power transistor „ Over-current due to defective inverter main circuit

continues for 2.5 seconds. CT input : Above 20 A „ The system will be shut down if the error occurs 16 times. „ Clearing condition : Continuous run for about 5 minutes (normal)

electrolytic capacitor

„ Over-current due to defective outdoor unit PCB „ Error detection due to outdoor unit PCB „ Over-current due to short-circuit

52

Service Diagnosis

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Si10-417.fm Page 53 Wednesday, September 22, 2004 6:38 PM

Si10-417

Troubleshooting

Trouble shooting

Check No.7-1 Refer to P.158

Check No.8 Refer to P.160

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

∗ An input over-current may result from wrong internal wiring. If the wires have been disconnected and reconnected for part replacement, for example, and the system is interrupted by an input over-current, take the following procedure. Get restarted and measure the input current.

Input current flowing above its stop level?

NO

Replace the outdoor unit PCB.

YES Check No. 14 Check the main circuit electrolytic capacitor.

Check No.14 Refer to P.164

Normal?

NO

Replace the electrolytic capacitor.

YES Turn off the power and disconnect the harnesses U, V and W.

∗ Inverter checker Part No.: 1225477

Check with the inverter checker (∗).

Any LED off?

YES

NO Turn off the power, and reconnect the harnesses. Turn on the power again and get restarted.

Correct the power supply or replace the SPM. (Replace the outdoor unit PCB.)

Check No. 8 Check the discharge pressure.

Check No. 7-1 Check the installation condition.

Service Diagnosis

(R2844)

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Si10-417.fm Page 54 Wednesday, September 22, 2004 6:38 PM

Troubleshooting

Si10-417

5.2.14 Input Over Current Detection Remote Controller Display

E8

Outdoor Unit LED Display

A5 11 24 31 44

Method of Malfunction Detection

An input over-current is detected by checking the input current value being detected by CT with the compressor running.

Malfunction Decision Conditions

„ The following CT input with the compressor running

Supposed Causes

„ Over-current due to compressor failure „ Over-current due to defective power transistor „ Over-current due to defective inverter main circuit

continues for 2.5 seconds. CT input : Above 20 A „ The system will be shut down if the error occurs 16 times. „ Clearing condition : Continuous run for about 5 minutes (normal)

electrolytic capacitor

„ Over-current due to defective outdoor unit PCB „ Error detection due to outdoor unit PCB „ Over-current due to short-circuit

54

Service Diagnosis

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Si10-417.fm Page 55 Wednesday, September 22, 2004 6:38 PM

Si10-417

Troubleshooting

Trouble shooting

Check No.7-1 Refer to P.158

Check No.8 Refer to P.160

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

∗ An input over-current may result from wrong internal wiring. If the wires have been disconnected and reconnected for part replacement, for example, and the system is interrupted by an input over-current, take the following procedure. Get restarted and measure the input current.

Input current flowing above its stop level?

NO

Replace the outdoor unit PCB.

YES Check No. 14 Check the main circuit electrolytic capacitor.

Check No.14 Refer to P.164

Normal?

NO

Replace the electrolytic capacitor.

YES Turn off the power and disconnect the harnesses U, V and W.

∗ Inverter checker Part No.: 1225477

Check with the inverter checker (∗).

Any LED off?

YES

NO Turn off the power, and reconnect the harnesses. Turn on the power again and get restarted.

Correct the power supply or replace the SPM. (Replace the outdoor unit PCB.)

Check No. 8 Check the discharge pressure.

Check No. 7-1 Check the installation condition.

Service Diagnosis

(R2844)

55

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Si10-417.fm Page 56 Wednesday, September 22, 2004 6:38 PM

Troubleshooting

Si10-417

5.2.15 Input Over Current Detection Remote Controller Display

E8

Method of Malfunction Detection

An input over-current is detected by checking the input current value being detected by CT with the compressor running.

Malfunction Decision Conditions

„ The following CT input with the compressor running

Supposed Causes

„ Over-current due to compressor failure „ Over-current due to defective power transistor „ Over-current due to defective inverter main circuit

continues for 2.5 seconds. CT input: Above 11 A „ The system will be shut down if the error occurs 16 times. „ Clearing condition : Continuous run for about 5 minutes (normal)

electrolytic capacitor

„ Over-current due to defective outdoor unit PCB „ Error detection due to outdoor unit PCB „ Over-current due to short-circuit

56

Service Diagnosis

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Si10-417.fm Page 57 Wednesday, September 22, 2004 6:38 PM

Si10-417

Troubleshooting

Trouble shooting

Check No.7-2 Refer to P.159

Check No.8 Refer to P.160

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

∗ An input over-current may result from wrong internal wiring. If the wires have been disconnected and reconnected for part replacement, for example, and the system is interrupted by an input over-current, take the following procedure. Get restarted and measure the input current.

Input current flowing above its stop level?

NO

Replace the outdoor unit PCB.

YES Check No. 14 Check the main circuit electrolytic capacitor.

Check No.14 Refer to P.164

Normal?

NO

Replace the electrolytic capacitor.

YES Turn off the power and disconnect the harnesses U, V and W.

∗ Inverter checker Part No.: 1225477

Check with the inverter checker (∗).

Any LED off? NO Turn off the power, and reconnect the harnesses. Turn on the power again and get restarted.

YES

Correct the power supply or replace the SPM. (Replace the outdoor unit PCB.)

Check No. 8 Check the discharge pressure. Check No. 7-2 Check the installation condition.

Note:

(R2844)

If the model doesn’t have SPM, replace the outdoor unit PCB.

Service Diagnosis

57

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Troubleshooting

Si10-417

5.2.16 Four Way Valve Abnormality Remote Controller Display

EA

Method of Malfunction Detection

The liquid pipe temperature thermistor, the outdoor air temperature thermistor and the outdoor unit heat exchanger thermistor are checked to see if they function within their normal ranges in the operating mode.

Malfunction Decision Conditions

A following condition occurs after 3 minutes of the compressor start. „ Cooling / dry operation (outdoor unit heat exchanger temp. – liquid pipe temp.) < –5°C „ Heating (liquid pipe temp. – outdoor unit heat exchanger temp.) < 0°C

Supposed Causes

„ „ „ „ „ „ „

58

Connector in poor contact Thermistor defective Outdoor unit PCB defective Four way valve coil or harness defective Four way valve defective Foreign substance mixed in refrigerant Insufficient gas

Service Diagnosis

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Si10-417.fm Page 59 Wednesday, September 22, 2004 6:38 PM

Si10-417

Troubleshooting

Trouble shooting

Caution

Four way valve coil disconnected (loose)?

Check No.5-2 Refer to P.156

Check No.6 Refer to P.157

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

YES

Correct.

NO Harness out of connector?

YES

Reconnect.

NO Check the continuity of the four way valve coil and harness.

Check No.11 Refer to P.162

Disconnect the harness from the connector. Resistance between harnesses about 3kΩ±0.5kΩ?

NO

Replace the four way valve coil.

YES Check No. 5-2 Check the four way valve switching output.

Malfunctioning

Replace the outdoor unit PCB.

Functioning Any thermistor disconnected?

YES

Reconnect in position.

NO Check No. 6 Check the thermistors.

Malfunctioning

Replace a defective thermistor.

Functioning Check No. 11 Malfunctioning Refer to the refrigerant Check the refrigerant line. l Insufficient line check procedure. gas l Water mixed Functioning l Stop valve defective Replace the four way valve (defective or dust-clogged). (R3040)

Service Diagnosis

59

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Si10-417.fm Page 60 Wednesday, September 22, 2004 6:38 PM

Troubleshooting

Si10-417

5.2.17 Four Way Valve Abnormality Remote Controller Display

EA

Method of Malfunction Detection

The indoor air temperature thermistor, the indoor unit heat exchanger thermistor, the outdoor temperature thermistor and the outdoor unit heat exchanger thermistor are checked to see if they function within their normal ranges in the operating mode.

Malfunction Decision Conditions

A following condition continues over 10 minute after operating 5 minutes. „ Cooling / dry operation (room temp. – indoor heat exchanger temp.) < -10°C „ Heating (indoor unit heat exchanger temp. – room temp.) < -10°C

Supposed Causes

„ „ „ „ „ „ „

60

Connector in poor contact Thermistor defective Outdoor unit PCB defective Four way valve coil or harness defective Four way valve defective Foreign substance mixed in refrigerant Insufficient gas

Service Diagnosis

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Si10-417

Troubleshooting

Trouble shooting

Caution

Four way valve coil disconnected (loose)?

Check No.5-2 Refer to P.156

Check No.6 Refer to P.157

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

YES

Correct.

NO Harness out of connector?

YES

Reconnect.

NO Check the continuity of the four way valve coil and harness.

Check No.11 Refer to P.162

Disconnect the harness from the connector. Resistance between harnesses about 3kΩ±0.5kΩ?

NO

Replace the four way valve coil.

YES Check No. 5-2 Check the four way valve switching output.

Malfunctioning

Replace the outdoor unit PCB.

Functioning Any thermistor disconnected?

YES

Reconnect in position.

NO Check No. 6 Check the thermistors.

Malfunctioning

Replace a defective thermistor.

Functioning Check No. 11 Malfunctioning Refer to the refrigerant Check the refrigerant line. l Insufficient line check procedure. gas l Water mixed Functioning l Stop valve defective Replace the four way valve (defective or dust-clogged). (R3040)

Service Diagnosis

61

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Si10-417.fm Page 62 Wednesday, September 22, 2004 6:38 PM

Troubleshooting

Si10-417

5.2.18 Four Way Valve Abnormality Remote Controller Display

EA

Method of Malfunction Detection

The room temperature thermistor, the indoor unit heat exchanger thermistor, the outdoor temperature thermistor and the outdoor unit heat exchanger thermistor are checked to see if they function within their normal ranges in the operating mode.

Malfunction Decision Conditions

A following condition continues over 1 minute after operating 10 minutes. „ Cooling / dry operation (room temp. – indoor heat exchanger temp.) < –10°C „ Heating (indoor unit heat exchanger temp. – room temp.) < –10°C

Supposed Causes

„ „ „ „ „ „ „

62

Connector in poor contact Thermistor defective Outdoor unit PCB defective Four way valve coil or harness defective Four way valve defective Foreign substance mixed in refrigerant Insufficient gas

Service Diagnosis

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Si10-417.fm Page 63 Wednesday, September 22, 2004 6:38 PM

Si10-417

Troubleshooting

Trouble shooting

Caution

Four way valve coil disconnected (loose)?

Check No.5-1 Refer to P.155

Check No.6 Refer to P.157

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. YES

Correct.

NO Harness out of connector?

YES

Reconnect.

NO Check the continuity of the four way valve coil and harness.

Check No.11 Refer to P.162

Disconnect the harness from the connector. Resistance between harnesses about 1500 Ω?

NO

Replace the four way valve coil.

YES Check No. 5-1 Check the four way valve switching output.

Malfunctioning

Replace the outdoor unit PCB.

Functioning Any thermistor disconnected?

YES

Reconnect in position.

NO Check No. 6 Check the thermistors.

Malfunctioning

Replace a defective thermistor.

Functioning Check No. 11 Check the refrigerant line. Functioning

Malfunctioning

Refer to the

l Insufficient refrigerant line check gas procedure. l Water mixed l Stop valve defective

Replace the four way valve (defective or dust-clogged). (R2845)

Service Diagnosis

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Troubleshooting

Si10-417

5.2.19 Four Way Valve Abnormality Remote Controller Display

EA

Outdoor Unit LED Display

A5 14 21 31 41

Method of Malfunction Detection

The liquid pipe thermistor, the outdoor temperature thermistor and the outdoor unit heat exchanger thermistor are checked to see if they function within their normal ranges in the operating mode.

Malfunction Decision Conditions

Either of the following conditions occurs 3 minutes after the compressor has started. „ Cooling / dry operation (Outdoor unit heat exchanger temperature – Liquid pipe temperature) < –5°C „ Heating operation (Liquid pipe temperature – Outdoor unit heat exchanger temperature) < –5°C

Supposed Causes

„ „ „ „ „ „

64

Connector in poor contact Thermistor defective Outdoor unit PCB defective Four way valve coil or harness defective Four way valve defective Foreign substance mixed in refrigerant

Service Diagnosis

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Si10-417

Troubleshooting

Trouble shooting

Caution

Four-way valve coil disconnected (loose)?

Check No.5-1 Refer to P.155

Check No.6 Refer to P.157

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. YES

Correct.

NO Harness out of connector?

YES

Reconnect.

NO Check the continuity of the four-way valve coil and harness.

Check No.11 Refer to P.162

Disconnect the harness from the connector. Resistance between harnesses about 1500 Ω?

NO

Replace the four-way valve coil.

YES Check No. 5-1 Check the four-way valve switching output.

Malfunctioning

Replace the outdoor unit PC board.

Functioning Any thermistor disconnected?

YES

Reconnect in position.

NO Check No. 6 Check the thermistors.

Malfunctioning

Replace a defective thermistor.

Functioning Check No. 11 Check the refrigerant line. Functioning

Malfunctioning

Refer to the

l Water mixed refrigerant line check l Shut-off procedure. valve defective

Replace the four way valve (defective or dust-clogged). (Q0353)

Service Diagnosis

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Si10-417.fm Page 66 Wednesday, September 22, 2004 6:38 PM

Troubleshooting

Si10-417

5.2.20 Discharge Pipe Temperature Control Remote Controller Display

F3

Method of Malfunction Detection

The discharge pipe temperature control (stop, frequency drooping, etc.) is checked with the temperature being detected by the discharge pipe thermistor.

Malfunction Decision Conditions

„ If a stop takes place 6 times successively due to

abnormal discharge pipe temperature, the system will be shut down. „ If the temperature being detected by the discharge pipe thermistor rises above °C, the compressor will stop. (The error is cleared when the temperature has dropped below °C.) Stop temperatures FTK(X)S, ATK(X)S series

others

1. above 45Hz (rising), above 40Hz (dropping)

120

80

117

80

2. 130~45Hz (rising), 25~40Hz (dropping)

110

70

117

80

3. below 30Hz (rising), below 25Hz (dropping)

105

65

117

80

„ The error counter will reset itself if this or any other

error does not occur during the following 60-minute compressor running time (total time). Supposed Causes

„ „ „ „ „ „ „ „

66

Refrigerant shortage Four way valve malfunctioning Discharge pipe thermistor defective (heat exchanger or outdoor air temperature thermistor defective) Outdoor unit PCB defective Water mixed in the local piping Electronic expansion valve defective Stop valve defective

Service Diagnosis

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Si10-417.fm Page 67 Wednesday, September 22, 2004 6:38 PM

Si10-417

Trouble shooting

Check No.4 Refer to P.151

Check No.6 Refer to P.157

Check No.11 Refer to P.162

Troubleshooting

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Check No. 6 Check the thermistors.

Functioning Check No. 4 Check the electronic expansion valve.

pipe thermistor l Outdoor unit heat exchanger thermistor l Outdoor temperature thermistor Malfunctioning

Replace a defective thermistor.

Replace the valve itself or the coil.

Functioning Check No. 11 Check the refrigerant line. Functioning

Service Diagnosis

Malfunctioning

l Discharge

Malfunctioning to the refrigerant l Refrigerant Refer line check procedure. shortage l Four way valve malfunctioning l Water mixed l Stop valve defective Replace the outdoor unit PCB. (R2846)

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Si10-417.fm Page 68 Wednesday, September 22, 2004 6:38 PM

Troubleshooting

Si10-417

5.2.21 Discharge Pipe Temperature Control Remote Controller Display

F3

Method of Malfunction Detection

The discharge pipe temperature control (stop, frequency drooping, etc.) is checked with the temperature being detected by the discharge pipe thermistor.

Malfunction Decision Conditions

„ If a stop takes place 6 times successively due to

Supposed Causes

abnormal discharge pipe temperature, the system will be shut down. „ If the temperature being detected by the discharge pipe thermistor rises above 120°C, the compressor will stop. (The error is cleared when the temperature has dropped below 107°C.) Stop temperatures (in case of 5.0kW class) (1) 110°C : above 45Hz (rising), above 40Hz (dropping) (2) 102°C : 30~45Hz (rising), 25~40Hz (dropping) (3) 98°C : below 30Hz (rising), below 25Hz (dropping) „ The error counter will reset itself if this or any other error does not occur during the following 60-minute compressor running time (total time). „ „ „ „ „ „ „ „

68

Refrigerant shortage Four way valve malfunctioning Discharge pipe thermistor defective (heat exchanger or outdoor temperature thermistor defective) Outdoor unit PCB defective Water mixed in the local piping Electronic expansion valve defective Stop valve defective

Service Diagnosis

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Si10-417.fm Page 69 Wednesday, September 22, 2004 6:38 PM

Si10-417

Trouble shooting

Check No.4 Refer to P.151

Check No.6 Refer to P.157

Check No.11 Refer to P.162

Troubleshooting

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Check No. 6 Check the thermistors.

Functioning Check No. 4 Check the electronic expansion valve.

pipe thermistor l Outdoor unit heat exchanger thermistor l Outdoor temperature thermistor Malfunctioning

Replace a defective thermistor.

Replace the valve itself or the coil.

Functioning Check No. 11 Check the refrigerant line. Functioning

Service Diagnosis

Malfunctioning

l Discharge

Malfunctioning to the refrigerant l Refrigerant Refer line check procedure. shortage l Four way valve malfunctioning l Water mixed l Stop valve defective Replace the outdoor unit PCB. (R2846)

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Si10-417.fm Page 70 Wednesday, September 22, 2004 6:38 PM

Troubleshooting

Si10-417

5.2.22 Discharge Pipe Temperature Control Remote Controller Display

F3

Outdoor Unit LED Display

A5 14 21 34 41

Method of Malfunction Detection

The discharge pipe temperature control (stop, frequency drooping, etc.) is checked with the temperature being detected by the discharge pipe thermistor.

Malfunction Decision Conditions

„ If a stop takes place 6 times straight due to abnormal

Supposed Causes

discharge pipe temperature, the system will be shut down. „ If the temperature being detected by the discharge pipe thermistor rises above 120°C, the compressor will stop. (The error is cleared when the temperature has dropped below 107°C.) Stop temperatures (in the case of 3MXS52BVMB) (1) 110°C when the frequency rises above 45 Hz or drops below 40 Hz. (2) 102°C when the frequency rises from 30 Hz to 45 Hz or drops from 40 Hz to 25 Hz. (3) 98°C when the frequency rises just up to 30 Hz or drops below 25 Hz. „ The error counter will reset itself if this or any other error does not occur during the following 60-minute compressor running time (total time). „ „ „ „ „ „ „ „

70

Refrigerant shortage Four way valve malfunctioning Discharge pipe thermistor defective (heat exchanger or outdoor temperature thermistor defective) Outdoor unit PCB defective Water mixed in the local piping Electronic expansion valve defective Stop valve defective

Service Diagnosis

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Si10-417.fm Page 71 Wednesday, September 22, 2004 6:38 PM

Si10-417

Trouble shooting

Check No.4 Refer to P.151

Check No.6 Refer to P.157

Check No.11 Refer to P.162

Troubleshooting

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Check No. 6 Check the thermistors. Functioning

Check No. 4 Check the electronic expansion valve.

pipe thermistor l Outdoor unit heat exchanger thermistor l Outdoor temperature thermistor Malfunctioning

Replace a defective thermistor.

Replace the valve itself or the coil.

Functioning Check No. 11 Check the refrigerant line. Functioning

Service Diagnosis

Malfunctioning

l Discharge

Malfunctioning to the refrigerant l Refrigerant Refer line check procedure. shortage l Four way valve malfunctioning l Water mixed l Stop valve defective Replace the outdoor unit PCB. (R2846)

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Troubleshooting

Si10-417

5.2.23 Discharge Pipe Temperature Control Remote Controller Display

F3

Method of Malfunction Detection

The discharge pipe temperature control (stop, frequency drooping, etc.) is checked with the temperature being detected by the discharge pipe thermistor.

Malfunction Decision Conditions

„ If a stop takes place 6 times successively due to

Supposed Causes

abnormal discharge pipe temperature, the system will be shut down. „ If the temperature being detected by the discharge pipe thermistor rises above 110°C, the compressor will stop. (The error is cleared when the temperature has dropped below 97°C.) Stop temperatures (1) 110°C : above 45Hz (rising), above 40Hz (dropping) (2) 102°C : 30~45Hz (rising), 25~40Hz (dropping) (3) 98°C : below 30Hz (rising), below 25Hz (dropping) „ The error counter will reset itself if this or any other error does not occur during the following 60-minute compressor running time (total time). „ Refrigerant shortage „ Four way valve malfunctioning „ Discharge pipe thermistor defective „ „ „ „

72

(heat exchanger or outdoor air temperature thermistor defective) Outdoor unit PCB defective Water mixed in the local piping Electronic expansion valve defective Stop valve defective

Service Diagnosis

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Si10-417.fm Page 73 Wednesday, September 22, 2004 6:38 PM

Si10-417

Trouble shooting

Check No.4 Refer to P.151

Check No.6 Refer to P.157

Check No.11 Refer to P.162

Troubleshooting

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Check No. 6 Check the thermistors. Functioning

Check No. 4 Check the electronic expansion valve.

pipe thermistor l Outdoor unit heat exchanger thermistor l Outdoor temperature thermistor Malfunctioning

Replace a defective thermistor.

Replace the valve itself or the coil.

Functioning Check No. 11 Check the refrigerant line. Functioning

Service Diagnosis

Malfunctioning

l Discharge

Malfunctioning to the refrigerant l Refrigerant Refer line check procedure. shortage l Four way valve malfunctioning l Water mixed l Stop valve defective Replace the outdoor unit PCB. (R2846)

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Si10-417.fm Page 74 Wednesday, September 22, 2004 6:38 PM

Troubleshooting

Si10-417

5.2.24 High Pressure Control in Cooling Remote Controller Display

F6

Method of Malfunction Detection

High-pressure control (stop, frequency drop, etc.) is activated in the cooling mode if the temperature being sensed by the heat exchanger thermistor exceeds the limit.

Malfunction Decision Conditions

Activated when the temperature being sensed by the heat exchanger thermistor rises above 60°C. (Deactivated when the said temperature drops below 50°C.)

Supposed Causes

„ „ „ „ „ „ „

Trouble shooting

The installation space is not large enough. Faulty outdoor unit fan Faulty electronic expansion valve Faulty defrost thermistor Faulty outdoor unit PCB Faulty stop valve Dirty heat exchanger

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Check the installation space.

Check No.4 Refer to P.151

Check No.6 Refer to P.157

Check No.7-1 Refer to P.158

Check No.9 Refer to P.160

Check No.7-1 Installation condition check Normal

Abnormal

Check No.9 Outdoor fan check

Abnormal

Normal

Change the air outlet grille position. Change the installation location. Clean the heat exchanger. Replace the fan motor. Repair the connector or fan motor lead wires.

Check No.4 Electronic expansion valve check

Judgment

Abnormal

Normal Check No.6 Heat exchanger thermistor check

Judgment

Abnormal

Replace the electronic expansion valve or coil. Replace the PCB.

Replace the heat exchanger thermistor.

Normal Replace PCB. (R2855)

74

Service Diagnosis

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Si10-417.fm Page 75 Wednesday, September 22, 2004 6:38 PM

Si10-417

Troubleshooting

5.2.25 High Pressure Control in Cooling Remote Controller Display

F6

Method of Malfunction Detection

High-pressure control (stop, frequency drop, etc.) is activated in the cooling mode if the temperature being sensed by the heat exchanger thermistor exceeds the limit.

Malfunction Decision Conditions

Activated when the temperature being sensed by the heat exchanger thermistor rises above 54°C. (Deactivated when the said temperature drops below 52°C.)

Supposed Causes

„ „ „ „ „ „ „

Service Diagnosis

The installation space is not large enough. Faulty outdoor unit fan Faulty electronic expansion valve Faulty outdoor unit heat exchanger thermistor Faulty outdoor unit PCB Faulty stop valve Dirty heat exchanger

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Troubleshooting

Trouble shooting

Si10-417

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Check the installation space.

Check No.4 Refer to P.151

Check No.6 Refer to P.157

Check No.7-2 Refer to P.159

Check No.9 Refer to P.160

Check No.7-2 Installation condition check Normal

Abnormal

Check No.9 Outdoor fan check

Abnormal

Normal

Change the air outlet grille position. Change the installation location. Clean the heat exchanger. Replace the fan motor. Repair the connector or fan motor lead wires.

Check No.4 Electronic expansion valve check

Judgment

Abnormal

Normal

Replace the electronic expansion valve or coil. Replace the PCB.

Check No.6 Heat exchanger thermistor check

Judgment

Abnormal

Replace the heat exchanger thermistor.

Normal Replace PCB. (R2855)

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Si10-417

Troubleshooting

5.2.26 Position Sensor Abnormality Remote Controller Display

H6

Method of Malfunction Detection

FTK(X)S, ATK(X)S series only A compressor startup failure is detected by checking the compressor running condition through the position detection circuit.

Malfunction Decision Conditions

„ The compressor fails to start in about 15 seconds

after the compressor run command signal is sent.

„ Clearing condition: Continuous run for about 5

minutes (normal)

„ The system will be shut down if the error occurs 16

times. Supposed Causes

„ „ „ „ „

Service Diagnosis

Compressor relay cable disconnected Compressor itself defective Outdoor unit PCB defective Stop valve closed Input voltage out of specification

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Troubleshooting

Trouble shooting

Si10-417

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Check No. 13 Check for short-circuit.

Check No.13 Refer to P.163

Normal

NO

Replace the outdoor unit PCB.

YES Check the electrolytic capacitor voltage.

DC290~380V?

NO

Replace the outdoor unit PCB.

YES Electricals or compressor harnesses connected as specified?

NO

Reconnect as specified.

YES Turn off the power. Disconnect the harnesses U, V and W. ∗ Inverter checker Part No.: 1225477

Check with the inverter checker (∗).

Any LED off? NO

YES

Correct the power supply or replace the outdoor unit PCB. Replace the compressor. (R3041)

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Si10-417

Troubleshooting

5.2.27 Position Sensor Abnormality Remote Controller Display

H6

Method of Malfunction Detection

A compressor startup failure is detected by checking the compressor running condition through the position detection circuit.

Malfunction Decision Conditions

„ The compressor fails to start in about 15 seconds

after the compressor run command signal is sent.

„ Clearing condition: Continuous run for about 5

minutes (normal)

„ The system will be shut down if the error occurs 16

times. Supposed Causes

„ „ „ „ „

Service Diagnosis

Compressor relay cable disconnected Compressor itself defective Outdoor unit PCB defective Stop valve closed Input voltage out of specification

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Troubleshooting

Trouble shooting

Si10-417

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Check No. 13 Check for short-circuit.

Check No.13 Refer to P.163

Normal

NO

YES Check the electrolytic capacitor voltage.

DC380±30V?

NO

Replace the outdoor unit PCB, outdoor unit fan.

Replace the outdoor unit PCB.

YES Electricals or compressor harnesses connected as specified?

NO

Reconnect as specified.

YES Turn off the power. Disconnect the harnesses U, V and W. ∗ Inverter checker Part No.: 1225477

Check with the inverter checker (∗).

Any LED off? NO

YES

Correct the power supply or replace the outdoor unit PCB. Replace the compressor. (R2847)

80

Service Diagnosis

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Si10-417

Troubleshooting

5.2.28 Position Sensor Abnormality Remote Controller Display

H6

Outdoor Unit LED Display

A5 14 24 31 41

Method of Malfunction Detection

A compressor startup failure is detected by checking the compressor running condition through the position detection circuit.

Malfunction Decision Conditions

„ The compressor fails to start in about 15 seconds

after the compressor run command signal is sent.

„ Clearing condition: Continuous run for about 5

minutes (normal)

„ The system will be shut down if the error occurs 16

times. Supposed Causes

„ „ „ „ „

Service Diagnosis

Compressor relay cable disconnected Compressor itself defective Outdoor unit PCB defective Stop valve closed Input voltage out of specification

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Troubleshooting

Trouble shooting

Si10-417

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Check No. 13 Check for short-circuit.

Check No.13 Refer to P.163

Normal

NO

YES Check the electrolytic capacitor voltage.

DC380±30V?

NO

Replace the outdoor unit PCB, outdoor unit fan.

Replace the outdoor unit PCB.

YES Electricals or compressor harnesses connected as specified?

NO

Reconnect as specified.

YES Turn off the power. Disconnect the harnesses U, V and W. ∗ Inverter checker Part No.: 1225477

Check with the inverter checker (∗).

Any LED off? NO

YES

Correct the power supply or replace the outdoor unit PCB. Replace the compressor. (R2847)

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Service Diagnosis

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Si10-417

Troubleshooting

5.2.29 Position Sensor Abnormality Remote Controller Display

H6

Method of Malfunction Detection

A compressor startup failure is detected by checking the compressor running condition through the position detection circuit.

Malfunction Decision Conditions

„ The compressor is not running in about 15 seconds

after the compressor run command signal is sent.

„ Clearing condition: Continuous run for about 5

minutes (normal)

„ The system will be shut down if the error occurs 8

times. Supposed Causes

„ „ „ „ „

Service Diagnosis

Compressor relay cable disconnected Compressor itself defective Outdoor unit PCB defective Stop valve closed Input voltage out of specification

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Troubleshooting

Trouble shooting

Si10-417

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Check No. 13 Check for short-circuit.

Check No.13 Refer to P.163

Normal

NO

Replace the outdoor unit PCB.

YES Check the electrolytic capacitor voltage.

DC290~380V?

NO

Replace the outdoor unit PCB.

YES Electricals or compressor harnesses connected as specified?

NO

Reconnect as specified.

YES Turn off the power. Disconnect the harnesses U, V and W. ∗ Inverter checker Part No.: 1225477

Check with the inverter checker (∗).

Any LED off? NO

YES

Correct the power supply or replace the outdoor unit PCB. Replace the compressor. (R3041)

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Si10-417

Troubleshooting

5.2.30 CT or Related Abnormality Remote Controller Display

H8

Method of Malfunction Detection

A CT or related error is detected by checking the compressor running frequency and CT-detected input current.

Malfunction Decision Conditions

The compressor running frequency is below 62 Hz and the CT input is below 0.1 V. (The input current is also below 0.5 A.) „ If this error repeats 4 times, the system will be shut down. „ The error counter will reset itself if this or any other error does not occur during the following 60-minute compressor running time (total time).

Supposed Causes

„ „ „ „

Trouble shooting

Check No.12 Refer to P.163

Power transistor defective Internal wiring broken or in poor contact Reactor defective Outdoor unit PCB defective Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Turn off the power and turn it on again. Get the system started.

∗ Running current as shown at right with relay cable 1 or 2? NO Check No. 12 Check the capacitor voltage.

DC290~380V?

YES

Replace the outdoor unit PCB.

Current Capacitor charged (guideline) when the indoor unit or outdoor unit main relay turns on

YES A

Rising with increasing frequency 2 sec

Time

NO Measure the rectifier input voltage. Voltage within the allowable range (Supply voltage±15%)? NO

Service Diagnosis

YES

Replace the outdoor unit PCB. Check the supply voltage.

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Troubleshooting

Si10-417

A Turn off the power. Disconnect the harnesses U, V and W. Check with the inverter checker (∗).

Any LED off?

* Inverter checker Part No.: 1225477 YES

NO Turn off the power and reconnect the above harnesses. Then turn on the power again and get the system restarted.

Compressor running?

YES

Correct the power supply or replace the SPM. (Replace the outdoor unit PCB.)

Replace the outdoor unit PCB.

NO Replace the compressor.

Note:

86

(R3042)

If the model doesn’t have SPM, replace the outdoor unit PCB.

Service Diagnosis

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Si10-417

Troubleshooting

5.2.31 CT or Related Abnormality Remote Controller Display

H8

Method of Malfunction Detection

A CT or related error is detected by checking the compressor running frequency and CT-detected input current.

Malfunction Decision Conditions

The compressor running frequency is below 55 Hz and the CT input is below 0.1 V. (The input current is also below 1.25 A.) „ If this error repeats 4 times, the system will be shut down. „ The error counter will reset itself if this or any other error does not occur during the following 60-minute compressor running time (total time).

Supposed Causes

„ „ „ „

Trouble shooting

Check No.12 Refer to P.163

Power transistor defective Internal wiring broken or in poor contact Reactor defective Outdoor unit PCB defective Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Turn off the power and turn it on again. Get the system started.

∗ Running current as shown at right with relay cable 1 or 2? NO Check No. 12 Check the capacitor voltage.

DC380±30V?

YES

Replace the outdoor unit PCB.

Capacitor charged Current (guideline) when the indoor unit or outdoor unit main relay turns on

YES A

Rising with increasing frequency 2 sec

Time

NO Measure the rectifier input voltage. Voltage within the allowable range (Supply voltage±15%)? NO

Service Diagnosis

YES

Replace the outdoor unit PCB. Check the supply voltage.

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Troubleshooting

Si10-417

A Turn off the power. Disconnect the harnesses U, V and W. Check with the inverter checker (∗).

Any LED off?

* Inverter checker Part No.: 1225477 YES

NO Turn off the power and reconnect the above harnesses. Then turn on the power again and get the system restarted.

Compressor running?

YES

Correct the power supply or replace the SPM. (Replace the outdoor unit PCB.)

Replace the outdoor unit PCB.

NO Replace the compressor.

88

(R2848)

Service Diagnosis

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Si10-417

Troubleshooting

5.2.32 CT or Related Abnormality Remote Controller Display

H8

Outdoor Unit LED Display

A5 14 24 31 41

Method of Malfunction Detection

A CT or related error is detected by checking the compressor running frequency and CT-detected input current.

Malfunction Decision Conditions

The compressor running frequency is below 55 Hz and the CT input is below 0.1 V. (The input current is also below 1.25 A.) „ If this error repeats 4 times, the system will be shut down. „ The error counter will reset itself if this or any other error does not occur during the following 60-minute compressor running time (total time).

Supposed Causes

„ „ „ „

Service Diagnosis

Power transistor defective Internal wiring broken or in poor contact Reactor defective Outdoor unit PCB defective

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Troubleshooting

Trouble shooting

Check No.12 Refer to P.163

Si10-417

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Turn off the power and turn it on again. Get the system started.

∗ Running current as shown at right with relay cable 1 or 2?

YES

Current Capacitor charged (guideline) when the indoor unit or outdoor unit main relay turns on

NO Check No. 12 Check the capacitor voltage.

DC380±30V?

Replace the outdoor unit PCB.

YES A

Rising with increasing frequency 2 sec

Time

NO Measure the rectifier input voltage. Voltage within the allowable range (Supply voltage±15%)?

YES

NO

Replace the outdoor unit PCB. Check the supply voltage.

A Turn off the power. Disconnect the harnesses U, V and W. Check with the inverter checker (∗).

Any LED off?

* Inverter checker Part No.: 1225477 YES

NO Turn off the power and reconnect the above harnesses. Then turn on the power again and get the system restarted.

Compressor running?

YES

Correct the power supply or replace the SPM. (Replace the outdoor unit PCB.)

Replace the outdoor unit PCB.

NO Replace the compressor.

90

(R2848)

Service Diagnosis

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Si10-417

Troubleshooting

5.2.33 CT or Related Abnormality Remote Controller Display

H8

Method of Malfunction Detection

A CT or related error is detected by checking the compressor running frequency and CT-detected input current.

Malfunction Decision Conditions

The compressor running frequency is above 68 Hz and the CT input is below 0.1 V. (The input current is also below 1.25 A.) „ If this error repeats 4 times, the system will be shut down. „ The error counter will reset itself if this or any other error does not occur during the following 60-minute compressor running time (total time).

Supposed Causes

„ „ „ „

Trouble shooting

Check No.12 Refer to P.163

Power transistor defective Internal wiring broken or in poor contact Reactor defective Outdoor unit PCB defective Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Turn off the power and turn it on again. Get the system started.

∗ Running current as shown at right with relay cable 1 or 2? NO Check No. 12 Check the capacitor voltage.

DC290~380V?

YES

Replace the outdoor unit PCB.

Current Capacitor charged (guideline) when the indoor unit or outdoor unit main relay turns on

YES A

Rising with increasing frequency 2 sec

Time

NO Measure the rectifier input voltage. Voltage within the allowable range (Supply voltage±15%)? NO

Service Diagnosis

YES

Replace the outdoor unit PCB. Check the supply voltage.

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Troubleshooting

Si10-417

A Turn off the power. Disconnect the harnesses U, V and W. Check with the inverter checker (∗).

Any LED off?

* Inverter checker Part No.: 1225477 YES

NO Turn off the power and reconnect the above harnesses. Then turn on the power again and get the system restarted.

Compressor running?

YES

Correct the power supply or replace the SPM. (Replace the outdoor unit PCB.)

Replace the outdoor unit PCB.

NO Replace the compressor.

Note:

92

(R3042)

If the model doesn’t have SPM, replace the outdoor unit PCB.

Service Diagnosis

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Si10-417

Troubleshooting

5.2.34 Thermistor or Related Abnormality (Outdoor Unit) Remote Controller Display

P4, J3, J6, H9

Method of Malfunction Detection

This type of error is detected by checking the thermistor input voltage to the microcomputer. [A thermistor error is detected by checking the temperature.]

Malfunction Decision Conditions

The thermistor input is above 4.96 V or below 0.04 V with the power on. Error J3 is judged if the discharge pipe thermistor temperature is smaller than the condenser thermistor temperature.

Supposed Causes

„ „ „ „ „

Connector in poor contact Thermistor defective Outdoor unit PCB defective Indoor unit PCB defective Condenser thermistor defective in the case of J3 error (outdoor unit heat exchanger thermistor in the cooling mode, or indoor unit heat exchanger thermistor in the heating mode)

Service Diagnosis

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Troubleshooting

Trouble shooting

Si10-417

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Turn on the power again.

Check No.6 Refer to P.157

Error displayed again on remote controller?

NO

Reconnect.

YES Connector or thermistor disconnected?

YES

Reconnect.

NO Check No. 6 Check the thermistor resistance value.

Normal?

NO

YES

Check No. 6 Check the indoor unit heat exchanger thermistor resistance value in the heating mode. Indoor unit heat exchanger thermistor functioning? YES

NO

Replace defective one(s) of the following thermistors. l Radiation fin thermistor l Discharge pipe temperature thermistor l Outdoor unit heat exchanger temperature thermistor l Outdoor air thermistor Replace the following thermistor. l Indoor unit heat exchanger thermistor Replace the outdoor unit PCB. (Replace the indoor unit PCB.) (R2849)

P4 : Radiation fin thermistor J3 : Discharge pipe thermistor J6 : Outdoor heat exchanger thermistor H9 : Outdoor air thermistor

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Service Diagnosis

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Si10-417

Troubleshooting

5.2.35 Thermistor or Related Abnormality (Outdoor Unit) Remote Controller Display

P4, J3, J6, J8, J9, H9

Outdoor Unit LED Display

A5 14 24 31 41

Method of Malfunction Detection

This type of error is detected by checking the thermistor input voltage to the microcomputer. [A thermistor error is detected by checking the temperature being detected by each thermistor.]

Malfunction Decision Conditions

When the thermistor input is above 4.96 V or below 0.04 V with the power on, the J3 error is judged if the discharge pipe thermistor temperature is smaller than the condenser thermistor temperature, or the system will be shut down if all the units are judged with the J8 error.

Supposed Causes

„ „ „ „ „

Connector in poor contact Thermistor defective Outdoor unit PCB defective Indoor unit PCB defective Condenser thermistor defective in the case of J3 error (outdoor unit heat exchanger thermistor in the cooling mode, or indoor unit heat exchanger thermistor in the heating mode)

Service Diagnosis

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Troubleshooting

Trouble shooting

Si10-417

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Turn on the power again.

Check No.6 Refer to P.157

Error displayed again on remote controller?

NO

Reconnect.

YES Connector or thermistor disconnected?

YES

Reconnect.

NO Check No. 6 Check the thermistor resistance value.

Normal? J3 error if discharge pipe thermistor temperature is smaller than condenser thermistor temperature

NO

YES

Cooling: Outdoor unit heat exchanger thermistor Heating: Indoor unit heat exchanger thermistor

Check No. 6 Check the indoor unit heat exchanger thermistor resistance value in the heating mode. Indoor unit heat exchanger thermistor functioning? YES

NO

Replace defective one(s) of the following thermistors. l Radiation fin thermistor l Discharge pipe temperature thermistor l Outdoor unit heat exchanger temperature thermistor l Liquid pipe thermistor l Gas pipe thermistor l Outdoor temperature thermistor

Replace the following thermistor. l Indoor unit heat exchanger thermistor Replace the outdoor unit PC board. (Replace the indoor unit PC board.) (Q0357)

P4 : Radiation fin thermistor J3 : Discharge pipe temperature thermistor J6 : Outdoor unit heat exchanger temperature thermistor J8 : Liquid pipe thermistor J9 : Gas pipe thermistor H9 : Outdoor temperature thermistor

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Service Diagnosis

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Si10-417

Troubleshooting

5.2.36 Thermistor or Related Abnormality (Outdoor Unit) Remote Controller Display

P4,J3,J6,J8,J9,H9

Method of Malfunction Detection

This type of error is detected by checking the thermistor input voltage to the microcomputer. [A thermistor error is detected by checking the temperature.]

Malfunction Decision Conditions

The thermistor input is above 4.96 V or below 0.04 V with the power on. Error J3 is judged if the discharge pipe thermistor temperature is smaller than the condenser thermistor temperature. In case of J8 or J9, the system will be shut down when the error is detected at all of operating units.

Supposed Causes

„ „ „ „ „

Connector in poor contact Thermistor defective Outdoor unit PCB defective Indoor unit PCB defective Condenser thermistor defective in the case of J3 error (outdoor unit heat exchanger thermistor in the cooling mode, or indoor unit heat exchanger thermistor in the heating mode)

Service Diagnosis

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Troubleshooting

Trouble shooting

Si10-417

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Turn on the power again.

Check No.6 Refer to P.157

Error displayed again on remote controller?

NO

Reconnect.

YES Connector or thermistor disconnected?

YES

Reconnect.

NO Check No. 6 Check the thermistor resistance value.

Normal?

NO

YES

Check No. 6 Check the indoor unit heat exchanger thermistor resistance value in the heating mode.

Indoor unit heat exchanger thermistor functioning? YES

NO

Replace defective one(s) of the following thermistors. l Radiation fin thermistor l Discharge pipe temperature thermistor l Outdoor unit heat exchanger temperature thermistor l Liquid pipe thermistor l Gas pipe thermistor l Outdoor temperature thermistor Replace the following thermistor. l Indoor unit heat exchanger thermistor Replace the outdoor unit PCB. (Replace the indoor unit PCB.) (R3043)

P4 : Radiation fin thermistor J3 : Discharge pipe temperature thermistor J6 : Outdoor unit heat exchanger temperature thermistor J8 : Liquid pipe temperature thermistor J9 : Gas pipe temperature thermistor H9 : Outdoor air temperature thermistor

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Si10-417

Troubleshooting

5.2.37 Electrical Box Temperature Rise Remote Controller Display

L3

Method of Malfunction Detection

An electrical box temperature rise is detected by checking the radiation fin thermistor with the compressor off.

Malfunction Decision Conditions

With the compressor off, the radiation fin temperature is above 122°C. (Reset is made when the temperature drops below 113°C.)

Supposed Causes

„ „ „ „ „

Trouble shooting

Fin temperature rise due to defective outdoor unit fan Fin temperature rise due to short-circuit Fin thermistor defective Connector in poor contact Outdoor unit PCB defective Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. WARNING To cool down the electricals, the outdoor unit fan gets started when the radiation fin temperature rises above 120˚C and stops itself when it drops below 113˚C.

Turn off the power and turn it on again.

Check No.6 Refer to P.157

Error again or outdoor unit fan activated?

YES

A

NO

Check No.7-1 Refer to P.158

B Check No. 9 Check the outdoor unit fan or related.

Malfunctioning

Functioning

Check No.9 Refer to P.160

Radiation fin dirty?

Too dirty

Replace the fan motor. Correct the connectors and fan motor leads. Replace the outdoor unit PCB. Clean up the radiation fin.

Slightly dirty Check No. 7-1 Check the installation condition.

Service Diagnosis

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Troubleshooting

Si10-417

A Check No. 6 Check the thermistor resistance value. l Fin thermistor Check the radiation fin temperature.

Thermistor as specified in its characteristic chart?

NO

Replace the fin thermistor.

YES

Above 122˚C?

NO

Replace the outdoor unit PCB.

YES B

100

(R2953)

Service Diagnosis

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Si10-417

Troubleshooting

5.2.38 Electrical Box Temperature Rise Remote Controller Display

L3

Method of Malfunction Detection

An electrical box temperature rise is detected by checking the radiation fin thermistor with the compressor off.

Malfunction Decision Conditions

With the compressor off, the radiation fin temperature is above 80°C (above 75°C in the case of 7.1kW class). (Reset is made when the temperature drops below 70°C.)

Supposed Causes

„ „ „ „ „

Trouble shooting

Fin temperature rise due to defective outdoor unit fan Fin temperature rise due to short-circuit Fin thermistor defective Connector in poor contact Outdoor unit PCB defective Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. WARNING To cool down the electricals, the outdoor unit fan gets started when the radiation fin temperature rises above 78˚C and stops itself when it drops below 70˚C.

Turn off the power and turn it on again.

Check No.6 Refer to P.157

Error again or outdoor unit fan activated?

YES

A

NO

Check No.7-1 Refer to P.158

B Check No. 9 Check the outdoor unit fan or related.

Malfunctioning

Functioning

Check No.9 Refer to P.160

Radiation fin dirty?

Too dirty

Replace the fan motor. Correct the connectors and fan motor leads. Replace the outdoor unit PCB. Clean up the radiation fin.

Slightly dirty Check No. 7-1 Check the installation condition.

Service Diagnosis

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Troubleshooting

Si10-417

A Check No. 6 Check the thermistor resistance value. l Fin thermistor Check the radiation fin temperature.

Thermistor as specified in its characteristic chart?

NO

Replace the fin thermistor.

YES Above 80˚C?

NO

Replace the outdoor unit PCB.

YES B

102

(R2850)

Service Diagnosis

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Si10-417

Troubleshooting

5.2.39 Electrical Box Temperature Rise Remote Controller Display

L3

Outdoor Unit LED Display

A5 14 24 31 44

Method of Malfunction Detection

An electrical box temperature rise is detected by checking the radiation fin thermistor with the compressor off.

Malfunction Decision Conditions

With the compressor off, the radiation fin temperature is above 80°C (above 75°C in the case of 8.0 · 9.0kW class). (Reset is made when the temperature drops below 70°C.)

Supposed Causes

„ „ „ „ „

Trouble shooting

Fin temperature rise due to defective outdoor unit fan Fin temperature rise due to short-circuit Fin thermistor defective Connector in poor contact Outdoor unit PCB defective Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. WARNING To cool down the electricals, the outdoor unit fan gets started when the radiation fin temperature rises above 78˚C and stops itself when it drops below 70˚C.

Turn off the power and turn it on again.

Check No.6 Refer to P.157

Error again or outdoor unit fan activated?

YES

A

NO

Check No.7-1 Refer to P.158

B Check No. 9 Check the outdoor unit fan or related.

Malfunctioning

Functioning

Check No.9 Refer to P.160

Radiation fin dirty?

Too dirty

Replace the fan motor. Correct the connectors and fan motor leads. Replace the outdoor unit PCB. Clean up the radiation fin.

Slightly dirty Check No. 7-1 Check the installation condition.

Service Diagnosis

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Troubleshooting

Si10-417

A Check No. 6 Check the thermistor resistance value. l Fin thermistor Check the radiation fin temperature.

Thermistor as specified in its characteristic chart?

NO

Replace the fin thermistor.

YES

Above 90˚C?

NO

Replace the outdoor unit PCB.

YES B

104

(R2850)

Service Diagnosis

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Si10-417.fm Page 105 Wednesday, September 22, 2004 6:38 PM

Si10-417

Troubleshooting

5.2.40 Electrical Box Temperature Rise Remote Controller Display

L3

Method of Malfunction Detection

An electrical box temperature rise is detected by checking the radiation fin thermistor with the compressor off.

Malfunction Decision Conditions

With the compressor off, the radiation fin temperature is above 80°C (above 75°C in the case of 7.1kW class). (Reset is made when the temperature drops below 70°C.)

Supposed Causes

„ „ „ „ „

Trouble shooting

Fin temperature rise due to defective outdoor unit fan Fin temperature rise due to short-circuit Fin thermistor defective Connector in poor contact Outdoor unit PCB defective

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. WARNING To cool down the electricals, the outdoor unit fan gets started when the radiation fin temperature rises above 78˚C and stops itself when it drops below 70˚C.

Turn off the power and turn it on again.

Check No.6 Refer to P.157

Error again or outdoor unit fan activated?

Check No.7-2 Refer to P.159

YES

A

NO B Check No. 9 Check the outdoor unit fan or related.

Malfunctioning

Functioning

Check No.9 Refer to P.160

Radiation fin dirty?

Too dirty

Replace the fan motor. Correct the connectors and fan motor leads. Replace the outdoor unit PCB. Clean up the radiation fin.

Slightly dirty Check No. 7-2 Check the installation condition.

Service Diagnosis

105

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Si10-417.fm Page 106 Wednesday, September 22, 2004 6:38 PM

Troubleshooting

Si10-417

A Check No. 6 Check the thermistor resistance value. l Fin thermistor Check the radiation fin temperature.

Thermistor as specified in its characteristic chart?

NO

Replace the fin thermistor.

YES Above 80˚C?

NO

Replace the outdoor unit PCB.

YES B

106

(R2850)

Service Diagnosis

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Si10-417.fm Page 107 Wednesday, September 22, 2004 6:38 PM

Si10-417

Troubleshooting

5.2.41 Radiation Fin Temperature Rise Remote Controller Display

L4

Method of Malfunction Detection

A radiation fin temperature rise is detected by checking the radiation fin thermistor with the compressor on.

Malfunction Decision Conditions

If the radiation fin temperature with the compressor on is above 81°C, „ If a radiation fin temperature rise takes place 4 times successively, the system will be shut down. „ The error counter will reset itself if this or any other error does not occur during the following 60-minute compressor running time (total time).

Supposed Causes

„ „ „ „ „

Trouble shooting

Fin temperature rise due to defective outdoor unit fan Fin temperature rise due to short-circuit Fin thermistor defective Connector in poor contact Outdoor unit PCB defective Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Turn off the power and turn it on again to get the system started.

Check No.6 Refer to P.157 Error displayed again?

YES

A

NO

Check No.7-1 Refer to P.158

B Check No. 9 Check the outdoor unit fan or related.

Malfunctioning

Functioning

Check No.9 Refer to P.160

Radiation fin dirty?

Too dirty

Replace the fan motor. Correct the connectors and fan motor leads. Replace the outdoor unit PCB. Clean up the radiation fin.

Slightly dirty Check No. 7-1 Check the installation condition.

Service Diagnosis

107

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Si10-417.fm Page 108 Wednesday, September 22, 2004 6:38 PM

Troubleshooting

Si10-417

A Check No. 6 Check the thermistor resistance value. l Fin thermistor Check the radiation fin temperature.

Thermistor as specified in its characteristic chart?

NO

Replace the fin thermistor.

YES Above 81˚C?

YES B

NO

Check the power transistor and fin for looseness. If they are found to be fit tightly, replace the PCB or the power transistor. (R2954)

108

Service Diagnosis

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Si10-417.fm Page 109 Wednesday, September 22, 2004 6:38 PM

Si10-417

Troubleshooting

5.2.42 Radiation Fin Temperature Rise Remote Controller Display

L4

Method of Malfunction Detection

A radiation fin temperature rise is detected by checking the radiation fin thermistor with the compressor on.

Malfunction Decision Conditions

If the radiation fin temperature with the compressor on is above 90°C, „ If a radiation fin temperature rise takes place 4 times successively, the system will be shut down. „ The error counter will reset itself if this or any other error does not occur during the following 60-minute compressor running time (total time).

Supposed Causes

„ „ „ „ „

Trouble shooting

Fin temperature rise due to defective outdoor unit fan Fin temperature rise due to short-circuit Fin thermistor defective Connector in poor contact Outdoor unit PCB defective Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Turn off the power and turn it on again to get the system started.

Check No.6 Refer to P.157 Error displayed again?

YES

A

NO

Check No.7-1 Refer to P.158

B Check No. 9 Check the outdoor unit fan or related.

Malfunctioning

Functioning

Check No.9 Refer to P.160

Radiation fin dirty?

Too dirty

Replace the fan motor. Correct the connectors and fan motor leads. Replace the outdoor unit PCB. Clean up the radiation fin.

Slightly dirty Check No. 7-1 Check the installation condition.

Service Diagnosis

109

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Si10-417.fm Page 110 Wednesday, September 22, 2004 6:38 PM

Troubleshooting

Si10-417

A Check No. 6 Check the thermistor resistance value. l Fin thermistor Check the radiation fin temperature.

Thermistor as specified in its characteristic chart?

NO

Replace the fin thermistor.

YES Above 90˚C? YES B

NO

Check the power transistor and fin for looseness. If they are found to be fit tightly, replace the PCB or the power transistor. (R2851)

110

Service Diagnosis

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Si10-417.fm Page 111 Wednesday, September 22, 2004 6:38 PM

Si10-417

Troubleshooting

5.2.43 Radiation Fin Temperature Rise Remote Controller Display

L4

Outdoor Unit LED Display

A5 11 21 31 44

Method of Malfunction Detection

A radiation fin temperature rise is detected by checking the radiation fin temperature being detected by the fin thermistor with the compressor on.

Malfunction Decision Conditions

If the radiation fin temperature with the compressor on is above 90°C for 5.2~7.5 kW-or-smaller class systems or above 85°C for 8.0 · 9.0 kW class systems, „ If a radiation fin temperature rise takes place 4 times successively, the system will be shut down. „ The error counter will reset itself if this or any other error does not occur during the following 60-minute compressor running time (total time).

Supposed Causes

„ „ „ „ „

Trouble shooting

Fin temperature rise due to defective outdoor unit fan Fin temperature rise due to short-circuit Fin thermistor defective Connector in poor contact Outdoor unit PCB defective Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Turn off the power and turn it on again to get the system started.

Check No.6 Refer to P.157

Error displayed again?

YES

NO

Check No.7-1 Refer to P.158

Check No. 9 Check the outdoor unit fan or related.

B Malfunctioning

Functioning

Check No.9 Refer to P.160

Radiation fin dirty?

A

Too dirty

Replace the fan motor. Correct the connectors and fan motor leads. Replace the outdoor unit PCB. Clean up the radiation fin.

Slightly dirty Check No. 7-1 Check the installation condition.

Service Diagnosis

111

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Si10-417.fm Page 112 Wednesday, September 22, 2004 6:38 PM

Troubleshooting

Si10-417

A Check No. 6 Check the thermistor resistance value. l Fin thermistor Check the radiation fin temperature.

Thermistor as specified in its characteristic chart?

NO

Replace the fin thermistor.

YES Above 90˚C? YES B

NO

Check the power transistor and fin for looseness. If they are found to be fit tightly, replace the PCB or the power transistor. (R2851)

112

Service Diagnosis

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Si10-417.fm Page 113 Wednesday, September 22, 2004 6:38 PM

Si10-417

Troubleshooting

5.2.44 Radiation Fin Temperature Rise Remote Controller Display

L4

Method of Malfunction Detection

A radiation fin temperature rise is detected by checking the radiation fin thermistor with the compressor on.

Malfunction Decision Conditions

If the radiation fin temperature with the compressor on is above 90°C, „ If a radiation fin temperature rise takes place 4 times successively, the system will be shut down. „ The error counter will reset itself if this or any other error does not occur during the following 60-minute compressor running time (total time).

Supposed Causes

„ „ „ „ „

Trouble shooting

Fin temperature rise due to defective outdoor unit fan Fin temperature rise due to short-circuit Fin thermistor defective Connector in poor contact Outdoor unit PCB defective Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Turn off the power and turn it on again to get the system started.

Check No.6 Refer to P.157 Error displayed again?

YES

A

NO

Check No.7-2 Refer to P.159

B Check No. 9 Check the outdoor unit fan or related.

Malfunctioning

Functioning

Check No.9 Refer to P.160

Radiation fin dirty?

Too dirty

Replace the fan motor. Correct the connectors and fan motor leads. Replace the outdoor unit PCB. Clean up the radiation fin.

Slightly dirty Check No. 7-2 Check the installation condition.

Service Diagnosis

113

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Si10-417.fm Page 114 Wednesday, September 22, 2004 6:38 PM

Troubleshooting

Si10-417

A Check No. 6 Check the thermistor resistance value. l Fin thermistor Check the radiation fin temperature.

Thermistor as specified in its characteristic chart?

NO

Replace the fin thermistor.

YES Above 90˚C? YES B

NO

Check the power transistor and fin for looseness. If they are found to be fit tightly, replace the PCB or the power transistor. (R2851)

114

Service Diagnosis

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Si10-417.fm Page 115 Wednesday, September 22, 2004 6:38 PM

Si10-417

Troubleshooting

5.2.45 Output Over Current Detection Remote Controller Display

L5

Method of Malfunction Detection

An output over-current is detected by checking the current that flows in the inverter DC section.

Malfunction Decision Conditions

„ A position signal error occurs while the compressor is

running.

„ A speed error occurs while the compressor is running. „ An output over-current input is fed from the output

over-current detection circuit to the microcomputer.

„ The system will be shut down if the error occurs 16

times.

„ Clearing condition: Continuous run for about 5

minutes (normal) Supposed Causes

„ „ „ „ „ „ „ „

Service Diagnosis

Over-current due to defective power transistor Over-current due to wrong internal wiring Over-current due to abnormal supply voltage Over-current due to defective PCB Error detection due to defective PCB Over-current due to closed stop valve Over-current due to compressor failure Over-current due to poor installation condition

115

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Si10-417.fm Page 116 Wednesday, September 22, 2004 6:38 PM

Troubleshooting

Trouble shooting

Check No.7-1 Refer to P.158

Check No.8 Refer to P.160

Check No.13 Refer to P.163

Si10-417

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

∗ An output over-current may result from wrong internal wiring. If the wires have been disconnected and reconnected for part replacement, for example, and the system is interrupted by an output over-current, take the following procedure.

Stop valve fully open?

Fully open the stop valve.

YES Turn off the power and turn it on again to get the system started. See if the same error occurs. NO Error again?

A

YES Turn off the power and disconnect the harnesses U, V and W.

Check with the inverter checker (∗).

Any LED off? NO 2A

116

NO

YES

Correct the power supply or replace the SPM. (Replace the outdoor unit PCB.)

Service Diagnosis

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Si10-417.fm Page 117 Wednesday, September 22, 2004 6:38 PM

Si10-417

Troubleshooting

A Monitor the supply voltage, discharge and suction pressures, and other factors for a long term. Possible causes l Instantaneous supply voltage drop l Compressor motor overloaded l Contact-induced electrical short-circuit

Keep on using as it is (monitor). Check the electricals' connectors and other fittings. ∗ Inverter checker Part No.: 1225477

2A Check No. 13 Check the power transistor.

Normal?

NO

YES Turn off the power, and reconnect the harnesses. Turn on the power again and get restarted.

Replace the SPM. (Replace the outdoor unit PCB.)

Check the supply voltage.

Voltage as rated?

NO

Correct the power supply.

YES Short-circuit or breakage between compressor's coil phases?

YES

Replace the compressor.

NO Check No. 8 Check the discharge pressure. Check No. 7-1 Check the installation condition. (R2852)

Service Diagnosis

117

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Si10-417.fm Page 118 Wednesday, September 22, 2004 6:38 PM

Troubleshooting

Si10-417

5.2.46 Output Over Current Detection Remote Controller Display

L5

Outdoor Unit LED Display

A5 11 21 34 41

Method of Malfunction Detection

An output over-current is detected by checking the current that flows in the inverter DC section.

Malfunction Decision Conditions

„ A position signal error occurs while the compressor is

running.

„ A speed error occurs while the compressor is running. „ An output over-current input is fed from the output

over-current detection circuit to the microcomputer.

„ The system will be shut down if the error occurs 16

times.

„ Clearing condition: Continuous run for about 5

minutes (normal) Supposed Causes

118

„ „ „ „ „ „ „ „

Over-current due to defective power transistor Over-current due to wrong internal wiring Over-current due to abnormal supply voltage Over-current due to defective PCB Error detection due to defective PCB Over-current due to closed stop valve Over-current due to compressor failure Over-current due to poor installation condition

Service Diagnosis

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Si10-417.fm Page 119 Wednesday, September 22, 2004 6:38 PM

Si10-417

Troubleshooting

Trouble shooting

Check No.7-1 Refer to P.158

Check No.8 Refer to P.160

Check No.13 Refer to P.163

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

∗ An output over-current may result from wrong internal wiring. If the wires have been disconnected and reconnected for part replacement, for example, and the system is interrupted by an output over-current, take the following procedure.

Stop valve fully open?

NO

Fully open the stop valve.

YES Turn off the power and turn it on again to get the system started. See if the same error occurs. NO Error again?

A

YES Turn off the power and disconnect the harnesses U, V and W.

Keep on using as it is (monitor). Check the electricals' connectors and other fittings. ∗ Inverter checker Part No.: 1225477

Check with the inverter checker (∗).

YES Any LED off? NO 2A

Service Diagnosis

Correct the power supply or replace the SPM. (Replace the outdoor unit PCB.)

119

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Troubleshooting

Si10-417

A Monitor the supply voltage, discharge and suction pressures, and other factors for a long term. Possible causes l Instantaneous supply voltage drop l Compressor motor overloaded l Contact-induced electrical short-circuit

Keep on using as it is (monitor). Check the electricals' connectors and other fittings. ∗ Inverter checker Part No.: 1225477

2A Check No. 13 Check the power transistor.

Normal?

NO

YES Turn off the power, and reconnect the harnesses. Turn on the power again and get restarted.

Replace the SPM. (Replace the outdoor unit PCB.)

Check the supply voltage.

Voltage as rated?

Correct the power supply or replace the SPM. (Replace the outdoor unit PCB.)

NO

Correct the power supply.

YES Short-circuit or breakage between compressor's coil phases?

YES

Replace the compressor.

NO Check No. 8 Check the discharge pressure. Check No. 7-1 Check the installation condition. (R2852)

120

Service Diagnosis

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Si10-417.fm Page 121 Wednesday, September 22, 2004 6:38 PM

Si10-417

Troubleshooting

5.2.47 Output Over Current Detection Remote Controller Display

L5

Method of Malfunction Detection

An output over-current is detected by checking the current that flows in the inverter DC section.

Malfunction Decision Conditions

„ A position signal error occurs while the compressor is

running.

„ A speed error occurs while the compressor is running. „ An output over-current input is fed from the output

over-current detection circuit to the microcomputer.

„ The system will be shut down if the error occurs 16

times.

„ Clearing condition: Continuous run for about 5

minutes (normal) Supposed Causes

„ „ „ „ „ „ „ „

Service Diagnosis

Over-current due to defective power transistor Over-current due to wrong internal wiring Over-current due to abnormal supply voltage Over-current due to defective PCB Error detection due to defective PCB Over-current due to closed stop valve Over-current due to compressor failure Over-current due to poor installation condition

121

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Troubleshooting

Trouble shooting

Check No.7-2 Refer to P.159

Check No.8 Refer to P.160

Check No.13 Refer to P.163

Si10-417

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

∗ An output over-current may result from wrong internal wiring. If the wires have been disconnected and reconnected for part replacement, for example, and the system is interrupted by an output over-current, take the following procedure.

Stop valve fully open?

NO

Fully open the stop valve.

YES Turn off the power and turn it on again to get the system started. See if the same error occurs. NO Error again?

A

YES Turn off the power and disconnect the harnesses U, V and W.

Keep on using as it is (monitor). Check the electricals' connectors and other fittings. ∗ Inverter checker Part No.: 1225477

Check with the inverter checker (∗).

YES Any LED off? NO 2A

122

Correct the power supply or replace the SPM. (Replace the outdoor unit PCB.)

Service Diagnosis

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Si10-417.fm Page 123 Wednesday, September 22, 2004 6:38 PM

Si10-417

Troubleshooting

A Monitor the supply voltage, discharge and suction pressures, and other factors for a long term. Possible causes l Instantaneous supply voltage drop l Compressor motor overloaded l Contact-induced electrical short-circuit

Keep on using as it is (monitor). Check the electricals' connectors and other fittings. ∗ Inverter checker Part No.: 1225477

2A Check No. 13 Check the power transistor.

Normal?

NO

YES Turn off the power, and reconnect the harnesses. Turn on the power again and get restarted.

Replace the SPM. (Replace the outdoor unit PCB.)

Check the supply voltage.

Voltage as rated?

Correct the power supply or replace the SPM. (Replace the outdoor unit PCB.)

NO

Correct the power supply.

YES Short-circuit or breakage between compressor's coil phases?

YES

Replace the compressor.

NO Check No. 8 Check the discharge pressure. Check No. 7-1 Check the installation condition. (R2852)

Service Diagnosis

123

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Troubleshooting

Si10-417

5.3 System 5.3.1 Insufficient Gas Remote Controller Display

U0

Method of Malfunction Detection

Gas shortage detection I : A gas shortage is detected by checking the CT-detected input current value and the compressor running frequency. Gas shortage detection II : A gas shortage is detected by checking the difference between indoor unit heat exchanger temperature and room temperature as well as the difference between outdoor unit heat exchanger temperature and room temperature.

Malfunction Decision Conditions

Gas shortage detection I : Input current < (A/Hz) x Compressor running frequency × Voltage + However, when the status of running frequency > (Hz) is kept on for a certain time. Note : The values are different from model to model.

FTK(X)S, ATK(X)S series.

1120 / 256

–80

65

Others

2760 / 256

–140

55

Gas shortage detection II : If a gas shortage error takes place 4 times successively, the system will be shut down. The error counter will reset itself if this or any other error does not occur during the following 60-minute compressor running time (total time). Supposed Causes

„ Refrigerant shortage (refrigerant leakage) „ Poor compression performance of compressor „ Discharge pipe thermistor disconnected, or indoor unit

or outdoor unit heat exchanger thermistor disconnected, room or outdoor air temperature thermistor disconnected „ Stop valve closed „ Electronic expansion valve defective

124

Service Diagnosis

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Si10-417.fm Page 125 Wednesday, September 22, 2004 6:38 PM

Si10-417

Troubleshooting

Trouble shooting

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. YES

Any thermistor disconnected?

Check No.4 Refer to P.151

NO

Check No.6 Refer to P.157

Reconnect in position. * Discharge pipe thermistor * Indoor / outdoor unit heat exchanger thermistor * Room temperature thermistor * Outdoor air thermistor

Stop valve closed?

YES

Open the stop valve.

NO Check for gas leakage. Oil oozing at relay pipe connections?

YES

NO Oil oozing at internal piping?

YES

Repair the pipe flare or replace the square union. A

NO Check No. 4 Electronic expansion valve functioning?

NO

YES

Check the CT.

Malfunctioning

Replace the electronic expansion valve. CT in trouble (refer to H8).

Functioning Change for a specified amount of fresh refrigerant.

Gas shortage error again?

YES

B

NO Procedure complete

Service Diagnosis

125

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Troubleshooting

Si10-417

A

Compressor vibrating too much?

YES

NO

Check the power transistor harness for looseness. Correct it as required. Also replace cracked pipe if any. Check the pipes for improper contact. Correct as required. Also replace cracked pipe if any.

B Malfunctioning Check No. 6 Check the thermistors.

Functioning

Replace the room temperature or outdoor air thermistor, or the indoor unit or outdoor unit heat exchanger thermistor. (1) Replace the PCB. (2) Replace the compressor. (R2853)

126

Service Diagnosis

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Si10-417.fm Page 127 Wednesday, September 22, 2004 6:38 PM

Si10-417

Troubleshooting

5.3.2 Insufficient Gas Remote Controller Display

U0

Method of Malfunction Detection

Gas shortage detection I : A gas shortage is detected by checking the CT-detected input current value and the compressor running frequency. Gas shortage detection II : A gas shortage is detected by checking the difference between indoor unit heat exchanger temperature and room temperature as well as the difference between outdoor unit heat exchanger temperature and room temperature.

Malfunction Decision Conditions

Gas shortage detection I : Input current < (A/Hz) x Compressor running frequency × Voltage + However, when the status of running frequency > 55 (Hz) is kept on for a certain time. Note : The values are different from model to model.

R410A

1756 / 256

–50

R22

2600 / 256

–300

RXD71BVMA

2420 / 256

55

Gas shortage detection II : If a gas shortage error takes place 4 times successively, the system will be shut down. The error counter will reset itself if this or any other error does not occur during the following 60-minute compressor running time (total time). Supposed Causes

„ Refrigerant shortage (refrigerant leakage) „ Poor compression performance of compressor „ Discharge pipe thermistor disconnected, or indoor unit

or outdoor unit heat exchanger thermistor disconnected, room or outside air temperature thermistor disconnected „ Stop valve closed „ Electronic expansion valve defective

Service Diagnosis

127

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Troubleshooting

Trouble shooting

Si10-417

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Any thermistor disconnected?

Check No.4 Refer to P.151

Check No.6 Refer to P.157

NO

YES * Discharge pipe thermistor * Indoor / outdoor unit heat exchanger thermistor * Room temperature thermistor * Outdoor air thermistor

Stop valve closed?

YES

Reconnect in position.

Open the stop valve.

NO Check for gas leakage. Oil oozing at relay pipe connections?

YES

NO Oil oozing at internal piping?

YES

Repair the pipe flare or replace the square union. A

NO Check No. 4 Electronic expansion valve functioning?

NO

YES

Check the CT.

Malfunctioning

Replace the electronic expansion valve. CT in trouble (refer to H8).

Functioning Change for a specified amount of fresh refrigerant.

Gas shortage error again?

YES

B

NO Procedure complete

128

Service Diagnosis

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Si10-417.fm Page 129 Wednesday, September 22, 2004 6:38 PM

Si10-417

Troubleshooting

A

Compressor vibrating too much?

YES

NO

Check the power transistor harness for looseness. Correct it as required. Also replace cracked pipe if any. Check the pipes for improper contact. Correct as required. Also replace cracked pipe if any.

B Malfunctioning Check No. 6 Check the thermistors.

Functioning

Replace the room temperature or outdoor air thermistor, or the indoor unit or outdoor unit heat exchanger thermistor. (1) Replace the PCB. (2) Replace the compressor. (R2853)

Service Diagnosis

129

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Troubleshooting

Si10-417

5.3.3 Insufficient Gas Remote Controller Display

U0

Outdoor Unit LED Display

A5 11 21 34 44

Method of Malfunction Detection

Gas shortage detection I : A gas shortage is detected by checking the CT-detected input current value and the compressor running frequency. Gas shortage detection II : A gas shortage is detected by checking the difference between indoor unit heat exchanger temperature and room temperature as well as the difference between outdoor unit heat exchanger temperature and room temperature.

Malfunction Decision Conditions

Gas shortage detection I : Input current < 8.78 / 256 (A/Hz) x Compressor running frequency + 0.25 However, when the status of running frequency > 55 (Hz) is kept on for a certain time. Note : The values are different from model to model. Gas shortage detection II : If a gas shortage error takes place 4 times straight, the system will be shut down. The error counter will reset itself if this or any other error does not occur during the following 60-minute compressor running time (total time).

Supposed Causes

„ Refrigerant shortage (refrigerant leakage) „ Poor compression performance of compressor „ Discharge pipe thermistor disconnected, or indoor unit

or outdoor unit heat exchanger thermistor disconnected, room or outside air temperature thermistor disconnected „ Stop valve closed „ Electronic expansion valve defective

130

Service Diagnosis

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Si10-417.fm Page 131 Wednesday, September 22, 2004 6:38 PM

Si10-417

Troubleshooting

Trouble shooting

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Any thermistor disconnected?

Check No.4 Refer to P.151

Check No.6 Refer to P.157

NO

YES * Discharge pipe thermistor * Indoor / outdoor unit heat exchanger thermistor * Room temperature thermistor * Outdoor air thermistor

Stop valve closed?

YES

Reconnect in position.

Open the stop valve.

NO Check for gas leakage. Oil oozing at relay pipe connections?

YES

NO Oil oozing at internal piping?

YES

Repair the pipe flare or replace the square union. A

NO Check No. 4 Electronic expansion valve functioning?

NO

YES

Check the CT.

Malfunctioning

Replace the electronic expansion valve. CT in trouble (refer to H8).

Functioning Change for a specified amount of fresh refrigerant.

Gas shortage error again?

YES

B

NO Procedure complete

Service Diagnosis

131

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Troubleshooting

Si10-417

A

Compressor vibrating too much?

YES

NO

Check the power transistor harness for looseness. Correct it as required. Also replace cracked pipe if any. Check the pipes for improper contact. Correct as required. Also replace cracked pipe if any.

B Malfunctioning Check No. 6 Check the thermistors.

Functioning

Replace the room temperature or outdoor air thermistor, or the indoor unit or outdoor unit heat exchanger thermistor. (1) Replace the PCB. (2) Replace the compressor. (R2853)

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5.3.4 Insufficient Gas Remote Controller Display

U0

Method of Malfunction Detection

Gas shortage detection I : A gas shortage is detected by checking the power consumption value and the compressor running frequency. Gas shortage detection II : A gas shortage is detected by checking the difference between indoor unit heat exchanger temperature and room temperature as well as the difference between outdoor unit heat exchanger temperature and room temperature.

Malfunction Decision Conditions

Gas shortage detection I : Power consumption < 1862 / 256 (A/Hz) × Compressor running frequency + (-18) However, when the status of running frequency > 61 (Hz) is kept on for a certain time. Note : The values are different from model to model. Gas shortage detection II : When the condition of the following 1-3 continued for a certain time. 1. During discharge pipe temperature control 2. Discharge pipe temp. > (255 / 256) × target discharge pipe temp. +20 3. Electronic expansion valve opening (the biggest value among operating units) ≥ 450 If a gas shortage error takes place 4 times successively, the system will be shut down. The error counter will reset itself if this or any other error does not occur during the following 60-minute compressor running time (total time).

Supposed Causes

„ Refrigerant shortage (refrigerant leakage) „ Poor compression performance of compressor „ Discharge pipe thermistor disconnected, or indoor unit

or outdoor unit heat exchanger thermistor disconnected, room or outdoor air temperature thermistor disconnected „ Stop valve closed „ Electronic expansion valve defective

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Trouble shooting

Si10-417

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Any thermistor disconnected?

Check No.4 Refer to P.151

Check No.6 Refer to P.157

NO

YES * Discharge pipe thermistor * Indoor / outdoor unit heat exchanger thermistor * Room temperature thermistor * Outdoor air thermistor

Stop valve closed?

YES

Reconnect in position.

Open the stop valve.

NO Check for gas leakage. Oil oozing at relay pipe connections?

YES

NO Oil oozing at internal piping?

YES

Repair the pipe flare or replace the square union. A

NO Check No. 4 Electronic expansion valve functioning?

NO

YES

Check the CT.

Malfunctioning

Replace the electronic expansion valve. CT in trouble (refer to H8).

Functioning Change for a specified amount of fresh refrigerant.

Gas shortage error again?

YES

B

NO Procedure complete

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A

Compressor vibrating too much?

YES

NO

Check the power transistor harness for looseness. Correct it as required. Also replace cracked pipe if any. Check the pipes for improper contact. Correct as required. Also replace cracked pipe if any.

B Malfunctioning Check No. 6 Check the thermistors.

Functioning

Replace the room temperature or outdoor air thermistor, or the indoor unit or outdoor unit heat exchanger thermistor. (1) Replace the PCB. (2) Replace the compressor. (R2853)

Service Diagnosis

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5.3.5 Over-voltage Detection Remote Controller Display

U2

Method of Malfunction Detection

An abnormal voltage rise is detected by checking the specified over-voltage detection circuit.

Malfunction Decision Conditions

„ An over-voltage signal is fed from the over-voltage

Supposed Causes

„ Supply voltage not as specified „ Over-voltage detection circuit defective „ PAM control part(s) defective

detection circuit to the microcomputer (The voltage is over 400V). „ The system will be shut down if the error occurs 5 times. „ Clearing condition: Continuous run for about 60 minutes (normal)

Trouble shooting

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Caution

Check the supply voltage.

Supply voltage as specified?

NO

Correct the power supply.

YES

Turn on the power again.Error displayed again?

NO

A

YES Repeat a couple of times. A Disturbance factors ∗ Noise ∗ Power supply distortion

Replace the SPM. (Replace the outdoor unit PCB.)

Check for such factors for a long term. (R2957)

Note:

136

If the model doesn’t have SPM, replace the outdoor unit PCB.

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Troubleshooting

5.3.6 Low-voltage Detection Remote Controller Display

U2

Method of Malfunction Detection

An abnormal voltage rise or drop is detected by checking the detection circuit or DC voltage detection circuit.

Malfunction Decision Conditions

„ An over-voltage signal is fed from the over-voltage

Supposed Causes

„ Supply voltage not as specified „ Over-voltage detector or DC voltage detection circuit

detection circuit to the microcomputer, or the voltage being detected by the DC voltage detection circuit is judged to be below 150 V for 0.1 second. „ The system will be shut down if the error occurs 16 times. „ Clearing condition: Continuous run for about 60 minutes (normal)

defective

„ PAM control part(s) defective

Trouble shooting

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Caution

Check the supply voltage.

Supply voltage as specified?

NO

Correct the power supply.

YES

Turn on the power again. System restarted? NO Repeat a couple of times. A

YES

A

Replace the SPM. (Replace the outdoor unit PCB.)

(Precaution before turning on the power again) Make sure the power has been off for at least 30 seconds. Disturbance factors Check for such factors ∗ Noise ∗ Power supply distortion for a long term. ∗ Try to get restarted a couple of times. (R2854)

Service Diagnosis

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5.3.7 Low-voltage Detection Remote Controller Display

U2

Outdoor Unit LED Display

A5 14 21 31 44

Method of Malfunction Detection

An abnormal voltage rise or drop is detected by checking the detection circuit or DC voltage detection circuit.

Malfunction Decision Conditions

„ An over-voltage signal is fed from the over-voltage

Supposed Causes

„ Supply voltage not as specified „ Over-voltage detector or DC voltage detection circuit

detection circuit to the microcomputer, or the voltage being detected by the DC voltage detection circuit is judged to be below 150 V for 0.1 second. „ The system will be shut down if the error occurs 16 times. „ Clearing condition: Continuous run for about 60 minutes (normal)

defective

„ PAM control part(s) defective

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Troubleshooting

Trouble shooting

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Caution

Check the supply voltage.

Supply voltage as specified?

NO

Correct the power supply.

YES

Turn on the power again. System restarted?

YES

A

NO Repeat a couple of times. A

Replace the SPM. (Replace the outdoor unit PCB.)

(Precaution before turning on the power again) Make sure the power has been off for at least 30 seconds. Disturbance factors Check for such factors ∗ Noise ∗ Power supply distortion for a long term. ∗ Try to get restarted a couple of times. (R2854)

Service Diagnosis

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Si10-417

5.3.8 Over-voltage Detection Remote Controller Display

U2

Method of Malfunction Detection

An abnormal voltage rise is detected by checking the detection circuit or DC voltage detection circuit.

Malfunction Decision Conditions

„ An over-voltage signal is fed from the over-voltage

Supposed Causes

„ Supply voltage not as specified „ Over-voltage detector or DC voltage detection circuit

detection circuit to the microcomputer, or more than 430 V occurred the voltage detected by the DC voltage detection circuit. „ The system will be shut down if the error occurs 4 times. „ Clearing condition: Continuous run for about 60 minutes (normal)

defective

„ PAM control part(s) defective

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Troubleshooting

Trouble shooting Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Check the supply voltage.

Supply voltage as specified?

NO

Correct the power supply.

YES

Turn on the power again. System restarted?

YES

A

NO Repeat a couple of times. Replace the SPM. (Replace the outdoor unit PCB.) A (Precaution before turning on the power again) Make sure the power has been off for at least 30 seconds. Disturbance factors Check for such factors ∗ Noise ∗ Power supply for a long term. distortion ∗ Try to get restarted a couple of times. (R2854)

Note:

If the model doesn't have SPM, replace the outdoor unit PCB.

Service Diagnosis

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5.3.9 Signal Transmission Error (between Indoor and Outdoor Units) Remote Controller Display

U4

Method of Malfunction Detection

The data received from the outdoor unit in indoor unitoutdoor unit signal transmission is checked whether it is normal.

Malfunction Decision Conditions

When the data sent from the outdoor unit cannot be received normally, or when the content of the data is abnormal.

Supposed Causes

„ Faulty outdoor unit PCB. „ Faulty indoor unit PCB. „ Indoor unit-outdoor unit signal transmission error due

to wiring error.

„ Indoor unit-outdoor unit signal transmission error due

to disturbed power supply waveform.

„ Indoor unit-outdoor unit signal transmission error due

to breaking of wire in the connection wires between the indoor and outdoor units (wire No. 2).

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Trouble shooting

Check No.10 Refer to P.162

Troubleshooting

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Check the indoor unit-outdoor unit connection wires. Is there any wiring error? NO Check the outdoor unit's LED A.

Is LED A flashing?

YES

NO

Correct the indoor unit-outdoor unit connection wires.

Diagnose the outdoor unit.

YES Check the voltage of the indoor unit-outdoor unit connection wires between No. 1 and No. 2, and between No 2 and No. 3. Is the voltage 0 V?

YES

NO Check No. 10 Check power supply waveform. Is there any disturbance? YES

NO

Replace the connection wires between the indoor and outdoor units.

Replace indoor unit control PCB . Locate the cause of the disturbance of the power supply waveform, and correct it. (R2840)

Service Diagnosis

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5.3.10 Outdoor Unit PCB Abnormality or Signal Transmission Circuit Abnormality Remote Controller Display

U4

Method of Malfunction Detection

The data received from the outdoor unit in indoor unitoutdoor unit signal transmission is checked whether it is normal.

Malfunction Decision Conditions

When the data sent from the outdoor unit cannot be received normally, or when the content of the data is abnormal. If the indoor unit cannot communicate with the outdoor unit for 15 seconds, the system will be shut down.

Supposed Causes

„ Faulty outdoor unit PCB. „ Faulty indoor unit PCB. „ Indoor unit-outdoor unit signal transmission error due

to wiring error.

„ Indoor unit-outdoor unit signal transmission error due

to breaking of wire in the connection wires between the indoor and outdoor units (the transmission wire).

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Troubleshooting

Trouble shooting

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Check the indoor unit-outdoor unit connection wires.

Is there any wiring error?

YES

NO Fully insulated? ex. between wirings, earth. Fine

Not enough

The connection YES wiring length over 30m? NO Check the outdoor unit's LED A.

Is LED A flashing?

NO

Correct the indoor unit-outdoor unit connection wires. Replace the connection wirings.

Carry out the wiring work within the regulation. (less than 30m)

Replace the outdoor unit PCB.

YES Disconnect the No.3 terminal. Check the voltage of the indoor unit-outdoor unit connection wires between No.2 and No. 3. (Touch the No.2 termintal with (-) in DC range)

Is the voltage 30~50V?

YES

Replace the indoor unit PCB.

NO Replace the outdoor unit PCB. (R3046)

Service Diagnosis

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5.3.11 Unspecified Voltage (between Indoor and Outdoor Units) Remote Controller Display

UA

Method of Malfunction Detection

The supply power is detected for its requirements (different from separate type and multi type) by the indoor / outdoor transmission signal.

Malfunction Decision Conditions

The separate type and multi type are interconnected.

Supposed Causes

„ „ „ „

Trouble shooting

Wrong models interconnected Wrong indoor unit PCB mounted Indoor unit PCB defective Wrong outdoor unit PCB mounted or defective

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Check the indoor and outdoor unit model numbers. Indoor unit and outdoor unit matched?

NO

Match the compatible models.

YES Check the code numbers (2P01234, for example) of the indoor and outdoor unit PC boards with the Parts List.

Matched compatibly? YES

146

NO

Change for the specified PC board (1) or (2). Replace the indoor unit PC board (1) (or the outdoor unit PC board). (Q0347)

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5.3.12 Anti-icing Function in Other Rooms / Unspecified Voltage (between Indoor and Outdoor Units) Remote Controller Display

UA, UH

Outdoor Unit LED Display

A5 11 21 31 41

Method of Malfunction Detection

A wrong connection is detected by checking the combination of indoor and outdoor units on the microcomputer.

Malfunction Decision Conditions

„ Operation halt due to the anti-icing function in other

rooms

„ Operation halt due to unspecified internal and/or

external voltages

„ Operation halt due to mismatching of indoor and

outdoor units Supposed Causes

„ Operation halt due to the anti-icing function in other

rooms

„ Wrong connections at the indoor unit „ PCB wrongly connected

Trouble shooting

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Error-displaying air-conditioner running?

NO

YES Supply voltage as specified?

NO

The freeze protection function is activated in other rooms. Refer to A5. Correct.

YES Check the model name.

Normal?

NO

Reconnect.

YES Check the combination of all the models being connected. (R3066)

Service Diagnosis

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5.3.13 Anti-icing Function in Other Rooms / Unspecified Voltage (between Indoor and Outdoor Units) Remote Controller Display

UA,UH

Method of Malfunction Detection

A wrong connection is detected by checking the combination of indoor and outdoor units on the microcomputer.

Malfunction Decision Conditions

„ Operation halt due to the anti-icing function in other

Supposed Causes

„ Operation halt due to the anti-icing function in other

Trouble shooting

rooms

„ Operation halt due to unspecified voltage between

indoor and outdoor units rooms

„ Wrong connections at the indoor unit „ PCB wrongly connected

Caution

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Error-displaying air-conditioner running?

NO

The anti-icing function is activated in other rooms. Refer to A5.

YES Supply voltage as specified?

NO

Correct.

YES Check the model number.

Normal?

NO

Reconnect.

YES Check the combination of all the models being connected. (R3045)

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5.4 Check 5.4.1 Fan Motor Connector Output Check Check No.01

1. Check connector connection. 2. Check motor power supply voltage output (pins 4-7 and 4-8). 3. Check motor control voltage (pins 4-3). 4. Check rotation command voltage output (pins 4-2). 5. Check rotation pulse input (pins 4-1). S1 7 6 5 4 3 2 1

Motor power supply voltage Unused Unused P.0V (reference potential) Motor control voltage (15 VDC) Rotation command voltage (1~ 6 VDC) Rotation pulse input (R3199)

Upper fan connector 7 6 5 4 3 2 1

Motor power supply voltage Unused Unused P.0V (reference potential) Motor control voltage (15 VDC) Rotation command voltage (1~ 5 VDC) Rotation pulse input

Lower fan connector 8 Motor power supply voltage 7 Unused 6 Unused 5 Unused 4 P.0V (reference potential) 3 Motor control voltage (15 VDC) 2 Rotation command voltage (1 to 5 VDC) 1 Rotation pulse input (R1224)

Service Diagnosis

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Check No.02

Si10-417

1. Check connector connection. 2. Check motor control voltage output (pins 2-1). S202 5 4 3 2 1

Motor power supply voltage Unused Unused P.0V (reference potential) Motor control power supply (R1073)

5.4.2 Limit Switch Continuity Check Check No.3

Remove the front grille. The limit switch is located at the left side of the drain pan assembly. Check the continuity of the switch connection.

Upward Tester Limit switch Forward

Shutter status

Open

Closed

Continuity

Continuity

No continuity (Q0363)

∗

150

The shutter can be opened and closed with hand. Keep the shutter open and closed all the way for each continuity check steps.

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5.4.3 Electronic Expansion Valve Check Check No.4 (for Pair System)

Conduct the followings to check the electronic expansion valve (EV). 1. Check to see if the EV connector is correctly inserted in the PCB. Compare the EV unit and the connector number. 2. Turn the power off and back on again, and check to see if all the EVs generate latching sound. 3. If any of the EVs does not generate latching noise in the above step 2, disconnect that connector and check the conductivity using a tester. Check the conductivity between pins 1, 3 and 6, and between pins 2, 4 and 5. If there is no conductivity between the pins, the EV coil is faulty. Harness 6P

Check

6P Connector 1

2

3

4

5

6

5-2 5-4 6-1 6-3

(R1082)

4. If no EV generates latching sound in the above step 2, the outdoor unit PCB is faulty. 5. If the conductivity is confirmed in the above step 2, mount a good coil (which generated latching sound) in the EV unit that did not generate latching sound, and check to see if that EV generates latching sound. ∗If latching sound is generated, the outdoor unit PCB is faulty. ∗If latching sound is not generated, the EV unit is faulty. Note:

Please note that the latching sound varies depending on the valve type.

Service Diagnosis

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Check No.4 (for Multi System)

Conduct the followings to check the electronic expansion valve (EV). 1. Check to see if the EV connector is correctly inserted in the PCB. Compare the EV unit and the connector number. 2. Turn the power off and back on again, and check to see if all the EVs generate latching sound. 3. If any of the EVs does not generate latching noise in the above step 2, disconnect that connector and check the conductivity using a tester. Check the conductivity between pins 1, 3 and 6, and between pins 2, 4 and 5. If there is no conductivity between the pins, the EV coil is faulty. 4. If no EV generates latching sound in the above step 2, the outdoor unit PCB is faulty. 5. If the conductivity is confirmed in the above step 2, mount a good coil (which generated latching sound) in the EV unit that did not generate latching sound, and check to see if that EV generates latching sound. ∗If latching sound is generated, the outdoor unit PCB is faulty. ∗If latching sound is not generated, the EV unit is faulty.

Note:

Please note that the latching sound varies depending on the valve type.

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Valve Body Condition Check Method / Measure (Symptom) (1) Valve body catches Reset power supply and cooling operation unit at fully opened or half conduct by unit. opened position. Check the liquid pipe (Symptom) temperature of noCooling: operation unit. „Water leakage at the no-operation unit Is it almost „Flow noise of same as the outside NO refrigerant in the noair temperature? operation unit „Operation halt due to YES icing protection Replace the EVn of the room.

Heating: (R1431) „The unit does not heat „Refrigerant flow rate vary by unit (Discharge air temperatures are different by room) „Peak cut (2) Valve body catches Reset power supply and conduct cooling operation unit at complete close by unit. position. (Symptom) Check the low pressure Cooling: „The only unit having problem does not cool Does the the room . pressure become into NO „When the only faulty vacuum zone? unit is in operation, the unit makes pump YES down. (The low pressure of Replace the EVn of the room. the unit becomes (R1432) vacuum) „IT is activated. „Abnormal discharge pipe temperature Heating: Insufficient gas due to liquid refrigerant stagnation inside the faulty indoor unit (Only for heat pump model) „The unit does not heat the room. „IT is activated. „Abnormal discharge pipe temperature

Service Diagnosis

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Troubleshooting

Valve Body Condition (Symptom) (3) Valve does not open fully. (Symptom) „The unit does not cool nor heat (only for heat pump model.) „IT is actuated. „Abnormal discharge pipe temperature

154

Si10-417

Check Method / Measure Check the number of rotation of shaft if it is 5 and half from full open to complete close using manual coil for electronic expansion valve. When the number of rotation of shaft is less than the above value, the valve may catch anywhere of the body.

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5.4.4 Four Way Valve Performance Check Check No.5-1

Turn off the power and turn it on again. Start the heating-mode run.

S80 voltage at DC 180-220 V with compressor on? (Fig. 1)

∗ Four way valve coil Cooling / dry : No continuity Heating : Continuity

NO

Replace the outdoor unit PCB.

YES Disconnect the four way valve coil from the connector and check the continuity. Four way valve coil resistance at 1500 Ω?

NO

YES (Fig. 1) Voltage at S80

Replace the four way valve coil. Replace the four way valve.

DC180-220V

Compressor Time ON

Service Diagnosis

(R2856)

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Check No.5-2

Si10-417

Turn off the power and turn it on again. Start the heating-mode run.

S80 voltage at DC 180-220 V with compressor on? (Fig. 1)

∗ Four way valve coil Cooling / dry : No continuity Heating : Continuity

NO

Replace the outdoor unit PCB.

YES Disconnect the four way valve coil from the connector and check the continuity. Four way valve coil resistance at 3kΩ±0.5kΩ?

NO

YES (Fig. 1) Voltage at S80

Replace the four way valve coil. Replace the four way valve.

DC180-220V

Compressor Time ON

156

(R3047)

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5.4.5 Thermistor Resistance Check Check No.6

Remove the connectors of the thermistors on the PCB, and measure the resistance of each thermistor using tester. The relationship between normal temperature and resistance is shown in the graph and the table below. Thermistor

R25°C=20kΩ B=3950

Temperature (°C) -20

211.0 (kΩ)

-15

150

-10

116.5

-5

88

0

67.2

5

51.9

10

40

15

31.8

20

25

25

20

30

16

35

13

40

10.6

45

8.7

50

7.2

Service Diagnosis

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5.4.6 Installation Condition Check Check No.7-1

Installation condition check

Check the allowable dimensions of the air suction and discharge area.

Abnormal

Normal Does the discharged air from other outdoor unit cause an increase of the suction air temperature?

YES

Change the position of the air discharge grille or the installation location.

Change the position of the air discharge grille or the installation location.

NO Is the heat exchanger very dirty?

YES

Clean the heat exchanger.

NO Is the air flow blocked by obstacles or winds blowing in the opposite direction? NO

YES Change the installation location or direction. Check the outside air temperature (temperature of air taken in by the outdoor unit). (The outside air temperature shall be 43˚C or lower.) (R1438)

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Check No.7-2

Troubleshooting

Installation condition check

Check the allowable dimensions of the air suction and discharge area.

Abnormal

Normal Does the discharged air from other outdoor unit cause an increase of the suction air temperature?

YES

NO Is the heat exchanger very dirty?

YES

Change the position of the air discharge grille or the installation location.

Change the position of the air discharge grille or the installation location.

Clean the heat exchanger.

NO Is the air flow blocked by obstacles or winds blowing in the opposite direction? NO

YES Change the installation location or direction. Check the outside air temperature (temperature of air taken in by the outdoor unit). (The outside air temperature shall be 46˚C or lower.) (R3048)

Service Diagnosis

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5.4.7 Discharge Pressure Check Check No.8 Discharge pressure check

High

NO

Replace compessor.

YES Is the stop valve open?

NO

Open the stop valve.

YES Is the connection pipe deformed?

NO

Replace the pipe installed at the site.

YES At the heat exchanger and air filter dirty? YES

NO

Clean. Replace the compressor. (R1443)

5.4.8 Outdoor Unit Fan System Check Check No.9

„ With DC Motor Check the outdoor unit fan system.

Outdoor unit fan running?

NO

A

YES Outdoor unit fan system functioning.

A

Fan motor lead wire connector disconnected?

YES

Reconnect.

NO Go to Check No. 15-1·2. (R2857)

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„ With AC Motor Check the outdoor fan system.

Does the outdoor fan rotate? YES

NO

Abnormal Check the fan motor lead wire Repair. connector for secure connection. Normal

Does Are the YES resistance at connector the outdoor unit fan start just after the power leads ∞? 1. red - black, is turned on? 2. white black NO NO Check the fan capacitor for continuity.

YES Replace the fan motor.

Continuity

No continuity

Replace the fan motor.

Replace the outdoor unit PCB. The outdoor fan system is normal. (R2670)

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5.4.9 Power Supply Waveforms Check Check No.10

Measure the power supply waveform between pins 1 and 3 on the terminal board, and check the waveform disturbance. „ Check to see if the power supply waveform is a sine wave (Fig.1). „ Check to see if there is waveform disturbance near the zero cross (sections circled in Fig.2) [Fig.1]

[Fig.2]

5.4.10 Inverter Units Refrigerant System Check Check No.11

Refrigerant system check Is the discharge thermister disconnected from the holder?

YES

Correct the problem.

NO YES Conduct vacuum Conduct the drying. check after operating the NO equipment for Check for gas leaks. a sufficient See the section on insufficient length of time. gas detection. YES Replace the refrigerant. Is any moisture found in sight glass.

(R1445)

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5.4.11 Capacitor Voltage Check Check No.12

„ Checking the capacitor voltage z With the circuit breaker still on, measure the voltage at

the power transistor (+) and (-) terminals. Set the multi-tester to DC and VOLTAGE RANGE before measurement. Be careful never to touch any live parts. * Since capacitor (+) and (-) are connected to power transistor (+) and (-), capacitor voltage can be measured at the power transistor (+) and (-) terminals.

5.4.12 Power Transistor Check Check No.13

„ Checking the power transistor z Never touch any live parts for at least 10 minutes after

turning off the circuit breaker. z If you cannot avoid to touch a live part, make sure that

the power transistor's supply voltage is below 50 V using the tester. z For the UVW, make measurements at the Faston terminal on the board or the relay connector. Tester's Power Power negative transistor UVW transistor UVW terminal (+) (–) Tester's Power Power positive UVW transistor UVW transistor terminal (+) (–) Normal Several kΩ to several MΩ resistance Abnormal 0 or ∞ resistance

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5.4.13 Main Circuit Electrolytic Capacitor Check Check No.14

„ Checking the main circuit electrolytic capacitor z Never touch any live parts for at least 10 minutes after

turning off the circuit breaker. z If unavoidably necessary to touch a live part, make

sure there is no DC voltage using the tester. z Check the continuity with the tester. Reverse the pins

and make sure there is continuity.

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5.4.14 Turning Speed Pulse Input on the Outdoor Unit PCB Check Check No.15-1

Make sure the voltage of 270±30V is being applied. (1) Stop the operation first and then the power, and disconnect the connector S70. (2) Make sure there is about DC 270 V between pins 4 and 7. (3) With the system and the power still off, reconnect the connector S70. (4) Make a turn of the fan motor with a hand, and make sure the pulse (0-15 V) appears twice at pins 1 and 4. If the fuse is blown out, the outdoor-unit fan may also be in trouble. Check the fan too. If the voltage in Step (2) is not applied, it means the PCB is defective. Replace the PCB. If the pulse in Step (4) is not available, it means the Hall IC is defective. Replace the DC fan motor.If there are both the voltage (2) and the pulse (4), replace the PCB. PCB S70 7 6 5 4 3 2 1

Turning speed pulse input (0-15 V) 15V

DC270V (R2859)

∗ Propeller fan motor : S70

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Check No.15-2

Si10-417

Make sure the voltage of 290~380V is being applied. (1) Stop the operation first and then the power off, and disconnect the connector S70. (2) Make sure there is about DC 280 V between pins 4 and 7. (3) With the system and the power still off, reconnect the connector S70. (4) Make a turn of the fan motor with a hand, and make sure the pulse (0-15 V) appears twice at pins 1 and 4. If the fuse is blown out, the outdoor-unit fan may also be in trouble. Check the fan too. If the voltage in Step (2) is not applied, it means the PCB is defective. Replace the PCB. If the pulse in Step (4) is not available, it means the Hall IC is defective. Replace the DC fan motor. If there are both the voltage (2) and the pulse (4), replace the PCB. PCB S70 7 6 5 4 3 2 1

Fan motor power supply voltage (310~340V)

P.0V (reference of electric potential) Fan motor control voltage (DC15V) Turning speed control voltage (DC~6.5V) Turning speed pulse input

(R3052)

∗ Propeller fan motor : S70

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5.4.15 Hall IC Check Check No.16

1. Check the connector connection. 2. With the power ON, operation OFF, and the connector connected, check the following. ∗Output voltage of about 5 V between pins 1 and 3. ∗Generation of 3 pulses between pins 2 and 3 when the fan motor is operating. Failure of (1) Æ faulty PCB Æ Replace the PCB. Failure of (2) Æ faulty hall IC Æ Replace the fan motor. Both (1) and (2) result Æ Replace the PCB.

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Cover.fm Page 2 Wednesday, September 22, 2004 6:36 PM

Dealer Head Office: Umeda Center Bldg., 4-12, Nakazaki-Nishi 2-chome, Kita-ku, Osaka, 530-8323 Japan Tokyo Office: JR Shinagawa East Bldg., 18-1, Konan 2-chome, Minato-ku, Tokyo, 108-0075 Japan

http://www.daikin.com/global/ c All rights reserved

The specifications, designs, and information in this brochure are subject to change without notice.

Printed in Japan 09/2004 AK