Panasonic WH-SXC09H3E8 Service Manual page 177

16.5.13 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 9 minutes 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
No
Replace the faulty water
pump.
Yes
Fix the system water
leakage.
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
Is the CN-FLOW connector
connection normal?
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?
177
No
- Connector poor contact
- Correct the connection
Yes
- Defect in indoor water flow
No
switch
- Replace the indoor water
flow switch
Yes
- Defect in indoor unit PCB
(main)
- Replace the indoor unit PCB
(main)