186
17.5.42 Outdoor Pipe Temperature Sensor Abnormality (F42)
Malfunction Decision Conditions:
During startup and operation of cooling and heating, the temperatures detected by the outdoor pipe 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.
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 outdoor pipe temperature
sensor
- Replace the outdoor pipe
temperature sensor
- Defect in outdoor unit PCB (main)
- Replace the outdoor unit PCB (main)
Check the outdoor pipe temperature sensor:
- Plug out connector from the outdoor unit PCB (main)
- Measure the resistance of the outdoor pipe
temperature sensor
Is the CN-TH1 connector
connection normal?
Is the measured resistance of the
outdoor pipe temperature sensor
matches the value specified in its
characteristic chart?
Caution
Outdoor Pipe / Outdoor Defrost Sensor
Characteristic
-10
0
10
20
30
40
50
15
20
25
30
10
5
0
Temperature (°C)
Re
si
st
an
ce
(K
)
