54
15.4.3 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
Sensor (Thermistor)
Characteristics
70
60
50
R
esi
sta
n
ce
(k
Ω
)
Temperature (ºC)
40
30
20
10
-10
0
10
20
30
40
50
0
1 Pipe temp. Sensor
2 Intake Air Temp. Sensor
1
2
When abnormality indication starts again
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
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 indoor intake air
temperature sensor matches the value specified in its
characteristic chart?
●
Defect in indoor intake air temperature sensor
●
Replace the indoor intake air temperature
sensor
●
●
Defect in indoor unit PCB
Replace the indoor 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
