96
16.4.10 H28 (Outdoor Pipe Temperature Sensor Abnormality)
Malfunction Decision Conditions
During startup and operation of cooling, 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
Is the measured resistance of the outdoor heat exchanger
temperature sensor matches the value specified in its
characteristic chart?
Is the connector connection normal?
When abnormality indication starts again.
For safety reason and to prevent
component breakdown, always switch
off the power before remove and
connect the component.
No
No
YES
YES
Check the outdoor heat exchanger temperature sensor:
Plug out connector from the outdoor unit PCB.
Measure the resistance of the outdoor heat exchanger
temperature sensor.
0
10
-10
10
20
30
40 50
0
20
30
40
50
60
70
Temperature (°C)
Resist
an
ce
(k
)
Sensor (Thermistor)
Characteristics
Outdoor Air Sensor
Outdoor Heat Exchanger
Sensor
Check the connector connection:
Turn off the power.
Check the connector connection.
Connector poor contact.
Correct the connection.
Defect in outdoor unit PCB.
Replace the outdoor unit PCB.
Defect in outdoor heat exchanger
temperature sensor.
Replace the outdoor heat exchanger
temperature sensor.
