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16.5.33 Output Over Current Detection (F23)
Malfunction Decision Conditions:
During operation of cooling and heating, when outdoor DC current is above 34 A (UX09,12HE8) or 54 A ±
4.0 A
(UX16HE8) is detected by the IPM DC Peak sensing circuitry in the outdoor unit PCB (main).
Malfunction Caused:
1 Faulty outdoor unit PCB (main).
2 Faulty compressor.
Abnormality Judgment:
Continue for 7 times.
Yes
No
Check the compressor winding resistance:
- Turn OFF the power and disconnect the
harnesses U, V, and W
- Measure the winding resistance between
U-V, V-W, and W-U
Are the compressor’s
winding resistance (U-V, V-
W, or U-W) shorted?
- Compressor defective due to
winding shorted
- Replace the compressor
- Outdoor electronic circuit
defect due to power transistor
shorted
- Replace the outdoor unit
PCB (main)
Troubleshooting:
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
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