193
19.5.4 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.
- Connector poor contact.
- Correct the connection.
- Defect in indoor refrigerant liquid
temperature sensor.
- Replace the indoor refrigerant
liquid temperature sensor.
- Defect in indoor unit PCB (main).
- Replace the indoor unit PCB (main).
Check the CN-TH1 connector connection:
- Turn OFF the power.
- Check the connector connection.
Check the indoor refrigerant liquid temperature sensor:
- Plug out connector from the outdoor unit PCB (main).
- Measure the resistance of the indoor refrigerant liquid
temperature sensor.
Is the CN-TH1 connector
connection normal?
Is the measured resistance of the
indoor refrigerant liquid temperature
sensor matches the value specified
in its characteristic chart?
No
No
Yes
Yes
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)
Resi
stanc
e (K
)
Troubleshooting:
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
Caution