Panasonic WH-UD30BE5-1 Service Manual page 66

16.5.23. Power Factor Correction (PFC) Abnormality (F41)
Malfunction Decision Conditions:
During operation of heating, when the PFC protection circuitry in the outdoor unit main PCB senses abnormal high DC voltage
level.
Malfunction Caused:
1. Power supply surge.
2. Compressor windings not uniform.
3. Faulty outdoor unit PCB.
Abnormality Judgment:
Continue 4 times in 10 minutes.
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