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16.5.32 Outdoor Discharge Pipe Temperature Sensor Abnormality (F40)
Malfunction Decision Conditions:
During startup and operation of 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:
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
Compressor Tank / Compressor Discharge Sensor
Characteristic
-10
0
10
20
30
40
50
150
200
250
300
350
100
50
0
Temperature (°C)
R
esi
st
ance
(K
)
No
No
Yes
Yes
Check the CN-DIS connector connnection:
- Turn OFF the power.
- Check the connector connection.
- 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).
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 CN-DIS connector
connection normal?
Is the measured resistance of the
outdoor discharge pipe temperature
sensor matches the value specified
in its characteristic chart?
