58
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
R
esi
st
an
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 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
