Ipm Malfunction Or Igbt Over-Strong Current Protection Diagnosis - Carrier 38MHRC Service Manual

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.
Check the outdoor fan and the
outdoor unit ventilation.
Check the compressor resistance values.
Replace the outdoor main PCB.
40
No
Check the IPM.
Yes
Yes
Yes
Specifications subject to change without notice.
Correct the connection or replace
Yes
the wires and connectors.
Replace the IPM board or replace
No
the main PCB.
Refer to the
No Fan Speed out of Control
solution.
No Replace the compressor.
SG-38MHRC-01