40 Specifications subject to change without notice. SG-38MHRC-01
DIAGNOSIS AND SOLUTION (CONT)
IPM malfunction or IGBT over-strong current protection diagnosis and solution (P0)
Description: When the voltage signal, that the IPM sends to the compressor drive chip is abnormal, the display LED displays P0”and the air
conditioner turns off.
Possible causes:
• Wiring mistake
• IPM malfunction
• Faulty outdoor fan assembly
• Compressor malfunction
• Faulty outdoor PCB
Troubleshooting
Check the wiring between main the
PCB and the compressor.
Correct the connection or replace
the wires and connectors.
Yes
No
Check the IPM. No
Yes
Replace the IPM board or replace
the main PCB.
Check the outdoor fan and the
outdoor unit ventilation.
No
Yes
Check the compressor resistance values.
No
Replace the compressor.
Yes
Replace the outdoor main PCB.
Refer to the
Fan Speed out of Control
solution.
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