Panasonic WH-MHF09G3E5 Service Manual page 120

16.5.36 Indoor Water Outlet Temperature Sensor Abnormality (F45)
Malfunction Decision Conditions:
During startup and operation of heating, the temperatures detected by the indoor water outlet temperature sensor
are used to determine sensor errors.
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
Temperature (°C)
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 outlet temperature sensor:
- Plug out connector from the indoor unit PCB (main).
- Measure the resistance of the indoor water outlet
temperature sensor.
Is the measured resistance of the
indoor water outlet temperature
sensor matches the value specified
in its characteristic chart?
30 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
120
- Connector poor contact.
- Correct the connection.
- Defect in indoor water outlet
temperature sensor.
- Replace the indoor water outlet
temperature sensor.
- Defect in indoor unit PCB (main).
- Replace the indoor unit PCB (main).