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15.5.10 H28 (Outdoor Pipe Temperature Sensor Abnormality)
Malfunction Decision Conditions
During startup and operation of cooling and heating, the temperatures detected by the outdoor pipe 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 heat exchanger temperature sensor:
●
Plug out connector from t he outdoor unit PCB
●
Measure the resistance of the outdoor heat exchanger
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 heat exchanger
temperature sensor matches the value specified in its
characteristic chart?
●
●
●
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?
YES
●
Connector poor contact
●
Correct the connection
NO
NO
YES
Defect in outdoor heat exchanger
temperature sensor
Replace the outdoor heat exchanger
temperature sensor
Sensor (Thermistor)
Characteristics
70
60
50
R
e
si
sta
n
ce
(k
Ω
)
Temperature (ºF)
40
30
20
10
0
1 Outdoor Air Sensor
2 Outdoor Heat Exchanger
Sensor
2
1
Caution
14
32
50
68
86
104
122