WH-MXC16G9E8 - Panasonic Air Conditioner Service Manual (repair manual). Page 124

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124 
16.5.32  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 10 minutes. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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