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13.5.7 H23 (Indoor Pipe Temperature Sensor Abnormality)
Malfunction Decision Conditions
During startup and operation of cooling, 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
esi
st
an
ce
(kΩ
)
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 outdoor air temperature sensor:
●
Plug out connector from the outdoor unit PCB
●
Measure the resistance of the outdoor intake air
temperature sensor
●
Defect in outdoor intake air temperature sensor
●
Replace the outdoor intake air temperature
sensor
●
Detect 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?
●
Connector poor contact
●
Correct the connection
YES
NO
Is the measured resistance of the outdoor intake air
temperature sensor matches the value specified in its
characteristic chart?
NO
YES
For safety reason and to prevent component
breakdown, always switch off the power
before remove and connect the component.
Caution