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78
15.5.7 H23 (Indoor Pipe Temperature Sensor Abnormality)
Malfunction Decision Conditions
During startup and operation of cooling and heating, the temperatures detected by the indoor heat exchanger
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
e
si
sta
nce
(k
Ω
)
Temperature (ºF)
40
30
20
10
0
1 Pipe temp. Sensor
2 Intake Air Temp. Sensor
1
2
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 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 outdoor intake air
temperature sensor matches the value specified in its
characteristic chart?
●
●
Replace the outdoor intake air temperature
sensor
●
Defect in outdoor unit PCB
●
Replace the outdoor unit PCB
Check the connector connection:
●
Plug out connector from the indoor unit PCB
●
Measure the resistance of the indoor pipe temperature
sensor
Is the connector connection normal?
YES
●
Connector poor contact
●
Correct the connection
NO
NO
YES
Defect in outdoor intake air temperature sensor
Caution
14
32
50
68
86
104
122