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16.5.44 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:
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
Check the outdoor defrost temperature sensor:
- Plug out connector from the outdoor unit PCB (main)
- Measure the resistance of the outdoor defrost
temperature sensor
- Defect in outdoor defrost
temperature sensor
- Replace the outdoor defrost
temperature sensor
Yes
Is the measured resistance of the
outdoor defrost temperature sensor
matches the value specified in its
characteristic chart?
No
Check the CN-TH2 connector connection:
- Turn OFF the power
- Check the connector connection
- Connector poor contact
- Correct the connection
No
Is the CN-TH2 connector
connection normal?
- Defect in outdoor unit PCB (main)
- Replace the outdoor unit PCB (main)
Yes
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