Carrier 40MB C Series Service Manual page 25

IPM malfunction or IGBT over−strong current protection diagnosis and solution (P0)
Error Code
Malfunction decision conditions
Supposed causes
P0
When the voltage signal that IPM send to compressor drive chip is abnormal, the display
LED shows "P0" and AC turns off.
Wiring mistake; IPM malfunction; Outdoor fan assembly faulty Compressor malfunction;
Outdoor PCB faulty
Fig. 32 – Troubleshooting
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