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Diagnostic procedure for check code
Check code
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Fixed-speed compressor fault
OCR: Overload Current Relay
Does the fixed-speed high
pressure switch operate?
Yes
Are the fixed-speed high
pressure switch parts normal?
Yes
Is service valve fully open?
Yes
Does the outdoor fan
normally operate?
Yes
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
No
C
Troubleshooting
Operation cause
1. Fixed-speed compressor high pressure SW error.
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.
No
No
Check parts.
If defective, replace.
No
Open service valve fully.
No
Are the connection, capacitor
No
and fan motor normal?
Repair failed position.
No
Are the high pressure sensor
characteristics normal?
Replace high pressure sensor.
Yes
Remove cause.
No
See judgment flow of fixed-speed
IOL, OL circuits "E6".
No
Reset relay.
Check compressor withstand
resistance.
No
Yes
Check and modify wiring
Yes
Check outdoor interface PC board.
If defective replace board.
Is the fixed-speed
IOL circuit normal?
Yes
Is the fixed-speed
OCR circuit normal?
Yes
Is circuit wiring normal?
Yes
57
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