Panasonic WH-ADF0309J3E5CM Service Manual page 250

25.2.4 Indoor Refrigerant Liquid Temperature Sensor Abnormality (- / - / H23)
Malfunction Decision Conditions:
During startup and operation of cooling and heating, the temperatures detected by the indoor refrigerant liquid
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
Temperature (°C)
Caution
Check the CN-TH1 connector connection:
- Turn OFF the power.
- Check the connector connection.
Is the CN-TH1 connector
connection normal?
Check the indoor refrigerant liquid temperature sensor:
- Plug out connector from the outdoor unit PCB (main).
- Measure the resistance of the indoor refrigerant liquid
temperature sensor.
Is the measured resistance of the
indoor refrigerant liquid 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
250
- Connector poor contact.
- Correct the connection.
- Defect in indoor refrigerant liquid
temperature sensor.
- Replace the indoor refrigerant
liquid temperature sensor.
- Defect in indoor unit PCB (main).
- Replace the indoor unit PCB (main).