Pioneer WAE009AMFI15RL, Service Manual

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9.4.10 Inverter compressor drive error diagnosis and solution(P4)
Error Code
P4
Malfunction decision
conditions 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.
Supposed causes Wiring mistake; IPM malfunction; Outdoor fan ass’y faulty
Compressor malfunction; Outdoor PCB faulty
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
℉
)