Pioneer WAE012AMFI15RL Service Manual page 57

9.4.10 Inverter compressor drive error diagnosis and solution(P4)
Error Code
Malfunction decision
conditions
Supposed causes
Trouble shooting:
Remark：
1) 9000 BTU, Heat Pump, 230V model: Measure the black pin and red pin of the motor connector, the resistance
should be around 385Ω at 20℃(68℉)
2) 9000 BTU and 12000 BTU 115 VAC Models, Both Cool Only and Heat Pump: Measure the black pin and red pin
of the motor connector, the resistance should be around 50Ω at 20℃(68℉)
3) 12000 BTU 230 VAC Models, Both Cool Only and Heat Pump: Measure the black pin and red pin of the motor
connector, the resistance should be around 293Ω at 20℃(68℉)
4) 18000 BTU 230 VAC Models, Both Cool Only and Heat Pump: Measure the black pin and red pin of the motor
connector, the resistance should be around 84.5Ω at 20℃(68℉)
5) 24000 BTU 230 VAC Models, Both Cool Only and Heat Pump: Measure the black pin and red pin of the motor
connector, the resistance should be around 88.5Ω at 20℃(68℉)
P4
An abnormal inverter compressor drive is detected by a special
detection circuit, including communication signal detection,
voltage detection, compressor rotation speed signal detection
and so on.
Wiring mistake; IPM malfunction; Outdoor fan ass'y faulty
Compressor malfunction; Outdoor PCB faulty
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