Panasonic WH-MHF09G3E5 Service Manual page 94

16.5.10 Deice Circulation Error (H65)
Malfunction Decision Conditions:
During deice operation, flow switch detects water flow for 10 seconds during deice.
Malfunction Caused:
1 Secondary pump.
2 Flow switch faulty.
3 Water pump faulty.
4 Indoor PCB.
Abnormality Judgment:
Continue 10 seconds.
Troubleshooting:
This error occurs during
deice operation.
Is secondary
pump installed directly
to the indoor unit?
NO
Flow switch remain ON - check
flow switch direction and continuity.
Flow switch defective?
NO
Replace indoor PCB.
For safety reason and to prevent component breakdown,
Caution
always switch off the power before remove and connect the component.
● Relocate secondary pump to buffer tank
YES
so that it does not circulate water to
indoor unit during deice.
YES
● Replace flow switch.
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