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17.4.3 H14 (Indoor Intake Air Temperature Sensor Abnormality)
Malfunction Decision Conditions
During startup and operation of cooling and heating, the temperatures detected by the indoor intake air
temperature sensor are used to determine sensor errors.
Malfunction Caused
Faulty
connector
connection.
Faulty
sensor.
Faulty
PCB.
Troubleshooting
Check the connector connection:
Turn off the power.
Check the connector connection.
Check the connector connection.
Is the connector connection normal?
When abnormality indication starts again.
For safety reason and to prevent component
breakdown, always switch off the power
before remove and connect the component.
breakdown, always switch off the power
before remove and connect the component.
Connector poor contact.
Correct the connection.
Correct the connection.
Defect in indoor unit PCB.
Replace the indoor unit PCB.
Replace the indoor unit PCB.
Defect in indoor intake air temperature sensor.
Replace the indoor intake air temperature sensor.
Replace the indoor intake air temperature sensor.
Check the indoor intake air temperature sensor:
Plug out connector from the indoor unit PCB.
Measure the resistance of the indoor intake air
temperature sensor.
Measure the resistance of the indoor intake air
temperature sensor.
Is the measured resistance of the indoor intake air
temperature sensor matches the value specified in its
characteristic chart?
temperature sensor matches the value specified in its
characteristic chart?
NO
NO
YES
YES
0
10
-10
10
20
30
40
50
0
20
30
40
50
60
70
Temperature (°C)
Resi
stan
ce
(K
)
Sensor (Thermistor)
Characteristics
Pipe temp. Sensor
Intake Air Temp. Sensor
Intake Air Temp. Sensor
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