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17.5.24 Output Over Current Detection (F23)
Malfunction Decision Conditions:
During operation of cooling and heating, when outdoor DC current is above 34A (UX09FE8, UX12FE8, UD09FE8,
UD12FE8, UD16FE8), 54A (UX16FE8) 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:
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
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 eletronic circuit
defect due to power transistor
shorted.
- Replace the outdoor unit
PCB (main).
Checking the power transistor
Never touch any live parts for at least 10 minutes after turning off the circuit breaker.
If unavoidably necessary touch a live part, make sure the power transistor’s supply
voltage is below 50 V using the tester.
For the UVW, make measurements at the Faston terminal on the board or the relay
connector.
Tester’s negative terminal
Several kohms to several Mohms
Power transistor
(+)
Power transistor
(+)
Power transistor
(-)
Power transistor
(-)
UVW
UVW
UVW
UVW
Tester’s positive terminal
Normal resistance
Abnormal resistance
0 or
∞
Yes
No
Summary of Contents for WH-ADC0916G9E8
Page 34: ...34 4 2 Outdoor Unit Air inlet rear Air inlet side Air inlet side Air outlet Air outlet ...
Page 40: ...40 8 Wiring Connection Diagram 8 1 Indoor Unit RY HT L1 RY HT L2 RY V3 RY V2 RY HT L3 ...
Page 100: ...100 Note Default value refer Location of Control and Component OPERATION ACTUAL ...