LG Therma V fault CH32

What it means

Comp Off function activates when the discharge temperature is sensed and rises above a certain temperature

Likely causes

1. Overload operation
2. Outdoor fan restraint, shielding, clogging
3. Refrigerant leakage (shortage)
4. Inverter compressor discharge sensor defective
5. EEV connector missing / EEV assembly fault
6. Insufficient power-on time before operation (less than 12 hours)
7. Faulty IPM (Intelligent Power Module)
8. Faulty compressor (insulation or coil failure)
9. Faulty inverter board
10. Unstable or zero output voltage from inverter
11. Fan locked
12. Obstruction/shield around the heat exchanger
13. Insufficient distance between product and wall
14. Piping condition issues such as pipe bending
15. EEV operation/connection status fault
16. Abnormal refrigerant pressure
17. Compressor restraint
18. Compressor wiring reverse phase loss
19. Short circuit or opening of internal connection line in compressor
20. Compressor winding resistance out of spec
21. Compressor insulation resistance failure
22. Inverter PCB assembly or connector connection fault
23. IGBTM failure
24. Refrigerant accumulation in internal compressor after mounting or extended power-off period, causing temporary reduced insulation resistance

Where to start

1. Is the product installation in good condition? Check whether the fan is locked, remove shields around heat exchangers, secure the distance between the outdoor unit and the wall, check for bent pipes and abnormalities. If No, remedy: remove cause of error.
2. Is there enough refrigerant? Check refrigerant leakage, supply refrigerant if not enough. If No, remedy: treat the leakage point and supply additional refrigerant.
3. Is the EEV properly assembled? Check the status of PCB(Inverter) EEV1 assembly, check the status of EEV assembly, check PCB(Inverter) IPM input signal connectors short-circuit -> refer to CH21 trouble shooting method. If No, remedy: LEV assembly / replacement.