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16.5.42 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.
Check the supply voltage.
Correct the power supply.
No
Supply voltage as specified?
Operate the system. Verify PFC
abnormality by measuring the DC
voltage between DCP-OUT and DCN-
OUT of the outdoor unit PCB (main).
- Defect in PFC circuitry
- Replace the outdoor unit
PCB (main)
Yes
Is the DC voltage between DCP-
OUT and DCN-OUT normal
(between 285-315Vdc)?
No
Yes
Check the compressor winding resistance:
- Turn OFF the power supply and disconnect
the harnesses U, V, and W
- Measure the winding resistance between U-
V, V-W, and W-U
Yes
Are the compressor’s winding
resistance (U-V, V-W, U-W)
uniform?
Replace the compressor.
Replace the outdoor unit
PCB (main).
No
Troubleshooting:
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
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