51
13.5.9 H27 (Outdoor Air Temperature Sensor Abnormality)
Malfunction Decision Conditions
During startup and operation of cooling, the temperatures detected by the outdoor air temperature sensor are
used to determine sensor errors.
Malfunction Caused
Faulty connector connection.
Faulty sensor.
Faulty PCB.
Troubleshooting
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 air temperature
sensor
Is the measured resistance of the outdoor air temperature
sensor matches the value specified in its characteristic
chart?
● Defect in outdoor air temperature sensor
● Replace the outdoor air temperature sensor
● Defect in outdoor unit PCB
● Replace the outdoor unit PCB
Check the connector connection:
●
Turn off the power
●
Check the connector connection
Is the connector connection normal?
● Connector poor contact
● Correct the connection
NO
YES
NO
YES
R
e
si
st
anc
e
(k
Ω)
Temperature (°C)
For safety reason and to prevent component
breakdown, always switch off the power
before remove and connect the component.
Sensor (Thermistor)
Characteristics
70
60
50
40
30
20
10
0
1 Outdoor Air Sensor
2 Outdoor Heat Exchang er
Sensor
1
2
-10
0
10
20
30
40
50
Caution
