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17.5.42 Outdoor Discharge Pipe Temperature Sensor Abnormality (F40)
Malfunction Decision Conditions:
During startup and operation of cooling and heating, the temperatures detected by the outdoor discharge 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:
Compressor Tank / Compressor Discharge Sensor
Characteristic
350
300
250
200
150
100
50
0
-10
0
10
20
Temperature (°C)
Check the CN-DIS connector connnection:
- Turn OFF the power.
- Check the connector connection.
Is the CN-DIS connector
connection normal?
Check the outdoor discharge pipe temperature sensor:
- Plug out connector from the outdoor unit PCB (main).
- Measure the resistance of the outdoor discharge
pipe temperature sensor.
Is the measured resistance of the
outdoor discharge pipe temperature
sensor matches the value specified
in its characteristic chart?
30
40
50
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
No
Yes
No
Yes
191
- Connector poor contact.
- Correct the connection.
- Defect in outdoor discharge pipe
temperature sensor.
- Replace the outdoor discharge pipe
temperature sensor.
- Defect in outdoor unit PCB (main).
- Replace the outdoor unit PCB (main).
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