Pioneer WYC009AMFI20 Service Manual page 40

9.3.8 IPM malfunction or IGBT over-strong current protection diagnosis and solution(P0)
Error Code
Malfunction decision
conditions
Supposed causes
Trouble shooting:
P0
When the voltage signal that IPM send to compressor drive chip
is abnormal, the display LED will show "P0" and AC will turn off.
Wiring mistake
●
IPM malfunction
●
Outdoor fan ass'y faulty
●
Compressor malfunction
●
Outdoor PCB faulty
●
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