Panasonic WH-SDC09H3E8 Service Manual page 193

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
(UD16HE8) 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.
Troubleshooting:
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
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
Caution
Are the compressor's
winding resistance (U-V, V-
W, or U-W) shorted?
193
- Compressor defective due to
Yes
winding shorted
- Replace the compressor
- Outdoor electronic circuit
No
defect due to power transistor
shorted
- Replace the outdoor unit
PCB (main)