Panasonic WH-UD30BE5-1 Service Manual page 58

16.5.15. IPM Overheating (F22)
Malfunction Decision Conditions:
During operation of heating, when temperature 95°C is detected by the outdoor IPM temperature sensor.
Malfunction Caused:
1. Faulty outdoor unit fan motor.
2. Faulty outdoor unit PCB.
Abnormality Judgment:
Continue 3 times in 30 minutes.
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