Panasonic WH-MXC09J3E8 Service Manual page 162

17.5.13 Water Flow Switch Abnormality (H62)
Malfunction Decision Conditions:
During operation of cooling and heating, the water flow detected by the indoor water flow switch is used to
determine water flow error.
Malfunction Caused:
1 Faulty water pump.
2 Water leak in system.
3 Faulty connector connection.
4 Faulty water flow switch.
5 Faulty indoor unit PCB (main).
Abnormality Judgment:
Continue for 10 seconds (but no judgment for 70 seconds after compressor startup/restart).
Troubleshooting:
Check the system water pump.
Is the water pump working?
Yes
Check the system water passage.
Is there any water leakage?
No
Check the CN-FLOW connector connection:
- Turn OFF the power
- Check the connector connection
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
Caution
No
Replace the faulty water
pump.
Yes
Fix the system water
leakage.
Is the CN-FLOW connector
connection normal?
Yes
Check the indoor water flow switch:
- Plug out connector from the indoor
unit PCB (main)
- Dismantle the water flow switch
- Position the water flow switch in
reverse direction (downward)
- Measure the continuity of the
water flow switch
Is there any continuity?
Yes
162
No
- Connector poor contact
- Correct the connection
- Defect in indoor water flow
No
switch
- Replace the indoor water
flow switch
- Defect in indoor unit PCB
(main)
- Replace the indoor unit PCB
(main)