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14.4.9 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
Sensor (Thermistor)
Characteristics
70
60
50
Resistance (kΩ)
40
30
20
10
0
Temperature (ºC)
-10 0 10 20 30 40 50
1 Outdoor Air Sensor
2 Outdoor Heat Exchanger
Sensor
1
2
When abnormality indication starts again
Check the outdoor air temperature sensor:
• Plug out connector from the outdoor unit PCB
• Measure the resistance of the outdoor air temperature
sensor
Is the measured resistance of the outdoor air temperature
sensor matches the value specified in its characteristic
chart?
• Defect in outdoor air temperature sensor
• Replace the outdoor air temperature sensor
• Defect in outdoor unit PCB
• Replace the outdoor unit PCB
For safety reason and to prevent component
breakdown, always switch off the power
before remove and connect the component.
Check the connector connection:
• Turn off the power
• Check the connector connection
Is the connector connection normal?
YES
• Connector poor contact
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