Service manual

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14
Troubleshooting
Diagnostic Procedure for Check Code
Check code Operation cause
1. Inverter high-pressure SW error
2. Inverter IOL (Inner Overload) operation
3. Service valve closed
[21] 4. Outdoor fan, capacitor error
Inverter high-pressure SW 5. Indoor/Outdoor PMV blockage
system alarm 6. Outdoor heat exchanger blockage
7. SV2 circuit blockage
8. Indoor – Outdoor communication error
9. Pd sensor error
10. Refrigerant over charge
Does the inverter
high-pressure switch operate?
Are the connections for the
capacitor and fan motor normal?
Is the high-pressure sensor
characteristics normal?
Is the inverter high-pressure
switch normal?
Is service valve fully open?
Does the outdoor fan
operate?
Refrigerant over charge
Blockage
Pipe breakage
Abnormal overload
Remove cause.
Check parts.
If defective, replace.
Open service valve fully.
Check and modify wiring.
Repair defective part.
Replace high-pressure sensor.
See judgment flow of inverter
IOL operation circuit "E5".
Repair SV2 bypass circuit.
(Coil error, disconnection of
wiring, etc.)
Check outdoor inverter P.C. board.
If defective replace board.
No
No
Yes
No
Yes
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
Is there a problem with the
outdoor unit heat exchanger?
➀ Blockage of heat exchanger
➁ Short circuit
Yes
No
Is SV2 bypass circuit normal?
No
Yes
Is the inverter IOL circuit normal?
Is circuit wiring normal?