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15.4.7 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
Resistance (k)
Tempera t ure ( ºC)
40
30
20
10
-10 0 10 20 30 40 50
0
1 Pipe temp. Sensor
2IntakeAirTemp.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
For safety reason and to prevent component
breakdown, always switch off the power
before remove and connect the component.
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
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