Panasonic WH-ADC0309H3E Service Manual page 194

17.5.45 Outdoor Defrost Temperature Sensor Abnormality (F43)
Malfunction Decision Conditions:
During startup and operation of cooling and heating, the temperatures detected by the outdoor defrost
temperature sensor are used to determine sensor error.
Malfunction Caused:
1 Faulty connector connection.
2 Faulty sensor.
3 Faulty outdoor unit PCB (main).
Abnormality Judgment:
Continue for 5 seconds.
Troubleshooting:
Outdoor Pipe / Outdoor Defrost Sensor
Characteristic
30
25
20
15
10
5
0
-10 0 10 20
Temperature (°C)
Check the CN-TH2 connector connnection:
- Turn OFF the power.
- Check the connector connection.
Is the CN-TH2 connector
connection normal?
Check the outdoor defrost temperature sensor:
- Plug out connector from the outdoor unit PCB (main).
- Measure the resistance of the outdoor defrost
temperature sensor.
Is the measured resistance of the
outdoor defrost 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
194
- Connector poor contact.
- Correct the connection.
- Defect in outdoor defrost
temperature sensor.
- Replace the outdoor defrost
temperature sensor.
- Defect in outdoor unit PCB (main).
- Replace the outdoor unit PCB (main).