Panasonic WH-UD30BE5-1 Service Manual page 65

16.5.22. Outdoor Discharge Pipe Temperature Sensor Abnormality (F40)
Malfunction Decision Conditions:
During startup and operation of heating, the temperatures detected by the outdoor discharge pipe temperature sensor are used
to determine sensor error.
Malfunction Caused:
1. Faulty connector connection.
2. Faulty sensor.
3. Faulty outdoor unit PCB.
Abnormality Judgment:
Continue for 5 seconds.
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