200
16.5.40 Indoor Water Inlet Temperature Sensor Abnormality (F37)
Malfunction Decision Conditions:
During startup and operation of cooling and heating, the temperatures detected by the indoor water inlet
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 water inlet temperature sensor:
- Plug out connector from the indoor unit PCB (main)
- Measure the resistance of the indoor water inlet
temperature sensor
- Defect in indoor water inlet
temperature sensor
- Replace the indoor water inlet
temperature sensor
Yes
Is the measured resistance of the
indoor water inlet 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