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17.5.39 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.
Troubleshooting:
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
No
No
Yes
Yes
Check the CN-TH1 connector connnection:
- Turn OFF the power
- Check the connector connection
- Connector poor contact
- Correct the connection
- Defect in indoor water inlet
temperature sensor
- Replace the indoor water inlet
temperature sensor
- Defect in indoor unit PCB (main)
- Replace the indoor unit PCB (main)
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
Is the CN-TH1 connector
connection normal?
Is the measured resistance of the
indoor water inlet temperature sensor
matches the value specified in its
characteristic chart?
Caution
Indoor Refrigerant Liquid / Water Inlet / Water
Outlet Sensor Characteristic
-10
0
10
20
30
40
50
50
60
70
80
90
100
110
120
40
30
10
20
0
Temperature (°C)
Res
ista
nc
e (K
)
