Outdoor unit display LED STATUS
P0 Temperature protection of compressor top.
Off: 105c; On: 90c
The trouble shooting is same with the one of indoor unit P2 protection.
Outdoor unit display
LED STATUS
P3 Compressor current protection
Outdoor unit display
LED STATUS
P4
Inverter module protection
The trouble shooting is same with the one of indoor unit P0 protection
Check the resistance of compressor, normally
U and V is 0.6 ohm
U and W is 0.6 ohm
V and W is 0.6 ohm
Turn one indoor unit only, Does the compressor start after
3 minutes?
Does the trouble occur again after compressor
running some time?
No
Yes
No
The compressor is defective
Check the refrigerant circulation volume and pressure
No
The compressor is defective
Yes
If refrigerant circulation volume and pressure is OK, change the outdoor main PCB.
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