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16.5.4 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.
Check the indoor refrigerant liquid temperature sensor:
- Plug out connector from the indoor unit PCB (main)
- Measure the resistance of the indoor refrigerant liquid
temperature sensor
- Defect in indoor refrigerant liquid
temperature sensor
- Replace the indoor refrigerant
liquid temperature sensor
Yes
Is the measured resistance of the
indoor refrigerant liquid temperature
sensor matches the value specified
in its characteristic chart?
No
Check the CN-TH1 connector connection:
- Turn OFF the power
- Check the connector connection
- Connector poor contact
- Correct the connection
No
Is the CN-TH1 connector
connection normal?
- Defect in indoor unit PCB (main)
- Replace the indoor unit PCB (main)
Yes
Troubleshooting:
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
Caution