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17.5.43 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.
Troubleshooting:
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
Yes
Yes
No
No
No
Yes
Check the supply voltage.
Are the compressor’s winding
resistance (U-V, V-W, U-W)
uniform?
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.
Correct the power supply.
Replace the compressor.
Replace the outdoor unit
PCB (main).
- Defect in PFC circuitry.
- Replace the outdoor unit
PCB (main).
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).
Is the DC voltage between DCP-
OUT and DCN-OUT normal
(between 285-315 Vdc)?
