Panasonic WH-SXH09D0E8 Service Manual page 71

16.5.25 Power Factor Correction (PFC) Abnormality (F41)
Malfunction Decision Conditions:
During operation of cooling and heating, when the PFC protection circuitry in the outdoor unit PCB (main) senses
abnormal high DC voltage level.
Malfunction Caused:
1 Power supply surge.
2 Compressor windings not uniform.
3 Faulty outdoor unit PCB (main).
Abnormality Judgment:
Continue 4 times in 20 minutes.
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