Panasonic WH-SDC09H3E8 Service Manual page 203

16.5.43 Outdoor Pipe Temperature Sensor Abnormality (F42)
Malfunction Decision Conditions:
During startup and operation of cooling and heating, the temperatures detected by the outdoor pipe 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:
Caution
Check the CN-TH1 connector connection:
- Turn OFF the power
- Check the connector connection
Is the CN-TH1 connector
connection normal?
Check the outdoor pipe temperature sensor:
- Plug out connector from the outdoor unit PCB (main)
- Measure the resistance of the outdoor pipe
temperature sensor
Is the measured resistance of the
outdoor pipe temperature sensor
matches the value specified in its
characteristic chart?
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
No
Yes
No
Yes
203
- Connector poor contact
- Correct the connection
- Defect in outdoor pipe temperature
sensor
- Replace the outdoor pipe
temperature sensor
- Defect in outdoor unit PCB (main)
- Replace the outdoor unit PCB (main)