57
Troubleshooting
Diagnostic procedure for check code
Check code Operation cause
[Ad] 1. Fixed-speed compressor high pressure SW error.
Fixed-speed compressor fault 2. Fixed-speed compressor IOL operation.
3. Service valve closed.
4. Outdoor fan, capacitor error.
5. Multi Controller/outdoor PMV blockage.
6. Outdoor heat exchanger blockage.
7. SV2 circuit blockage.
8. Miswiring of communicaiton between indoor and outdoor unit.
9. Pd sensor error.
10.Refrigerant overcharge.
OCR: Overload Current Relay
Does the fixed-speed high
pressure switch operate?
Are the fixed-speed high
pressure switch parts normal?
Is service valve fully open?
Does the outdoor fan
normally operate?
Is there a problem with the
outdoor unit heat exchanger?
(1) Blockage of heat exchanger
(2) Short circuit (air flow)
(3) Blockage of air flow
C
Check parts.
If defective, replace.
Open service valve fully.
Remove cause.
Are the connection, capacitor
and fan motor normal?
Are the high pressure sensor
characteristics normal?
See judgment flow of fixed-speed
IOL, OL circuits “E6”.
Check outdoor interface PC board.
If defective replace board.
Is the fixed-speed
IOL circuit normal?
Is circuit wiring normal?
Check and modify wiring
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Ye s
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No
No
No
No
No
No
No
Repair failed position.
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No
Replace high pressure sensor.
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No
Reset relay.
Check compressor withstand
resistance.
Is the fixed-speed
OCR circuit normal?
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Ye s
No
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