Panasonic WH-ADF0309J3E5CM Service Manual page 257

25.2.11 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 water system passage
Is there any water leakage
No
Check the CN-FLWSEN 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 water leakage
Is the CN4 connector
connection normal?
Yes
Check the Vdc from the indoor unit PCB
(main):
- Disconnect flow sensor from the indoor
unit PCB terminal CN-FLWSEN
- Turn ON the power.
- Measure the Vdc as shown in Figure 1
(pin 1 and 3)
- Is the Vdc measurement 5Vdc?
Yes
- Defect in flow sensor.
- Replace the flow sensor
5Vdc
257
No
- Connector poor contact.
- Correct the connection.
- Defect in indoor unit PCB
No
(main).
- Replace the indoor unit PCB
(main).
5V
CN-FLWSEN
(WHT)
1
BR
W
C92
B
0.1u
BL
4
R130
10k
Figure 1
FLOW
SENSOR