80
15.5.9 H27 (Outdoor Air Temperature Sensor Abnormality)
Malfunction Decision Conditions
During startup and operation of cooling and heating, the temperatures detected by the outdoor air temperature
sensor are used to determine sensor errors.
Malfunction Caused
Faulty connector connection.
Faulty sensor.
Faulty PCB.
Troubleshooting
When abnormality indication starts again
Check the outdoor air temperature sensor:
●
Plug out connector from t he outdoor unit PCB
●
Measure the resistance of the outdoor air temperature
sensor
For safety reason and to prevent component
breakdown, always switch off the power
before remove and connect the component.
Is the measured resistance of the outdoor air temperature
sensor matches the value specified in its characteristic
chart?
●
●
Replace the outdoor air temperature sensor
●
Defect in outdoor unit PCB
●
Replace the outdoor unit PCB
Check the connector connection:
●
Turn off the power
●
Check the connector connection
Is the connector connection normal?
YES
●
Connector poor contact
●
Correct the connection
NO
NO
YES
Defect in outdoor air temperature sensor
Sensor (Thermistor)
Characteristics
70
60
50
Resistance (kΩ)
Temperature (ºF)
40
30
20
10
0
1 Outdoor Air Sensor
2
Outdoor Heat Exchanger
Sensor
2
1
Caution
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