Panasonic WH-MXC09J3E8 Service Manual page 189

17.5.39 Indoor Water Inlet Temperature Sensor Abnormality (F37)
Malfunction Decision Conditions:
During startup and operation of cooling and heating, the temperatures detected by the indoor water inlet
temperature sensor are used to determine sensor error.
Malfunction Caused:
1 Faulty connector connection.
2 Faulty sensor.
3 Faulty indoor unit PCB (main).
Abnormality Judgment:
Continue for 5 seconds.
Troubleshooting:
Indoor Refrigerant Liquid / Water Inlet / Water
Outlet Sensor Characteristic
120
110
100
90
80
70
60
50
40
30
20
10
0
-10 0 10 20 30
Temperature (°C)
Caution
Check the CN-TH1 connector connnection:
- Turn OFF the power
- Check the connector connection
Is the CN-TH1 connector
connection normal?
Check the indoor water inlet temperature sensor:
- Plug out connector from the indoor unit PCB (main)
- Measure the resistance of the indoor water inlet
temperature sensor
Is the measured resistance of the
indoor water inlet temperature sensor
matches the value specified in its
characteristic chart?
40 50
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
No
Yes
No
Yes
189
- Connector poor contact
- Correct the connection
- Defect in indoor water inlet
temperature sensor
- Replace the indoor water inlet
temperature sensor
- Defect in indoor unit PCB (main)
- Replace the indoor unit PCB (main)