60
15.4.9 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
Sensor (Therm istor)
Characteristics
70
60
50
R
esi
st
an
ce
(k
Ω
)
40
30
20
10
0
Temperature (ºC)
-10
0
10
20
30
40
50
1 Outdoor Air Sensor
2 Outdoor Heat Exchanger
Sensor
1
2
Is the measured resistance of the outdoor heat exchanger
temperature sensor matches the value specified in its
characteristic chart?
YES
When abnormality indicationstarts again
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
●
Defectin outdoor heat exchanger
temperaturesensor
●
Replace the outdoor heat exchanger
temperaturesensor
●
Defectin 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.
Checkthe connector connection:
●
Turn off the power
●
Check the connector connection
Is the connector connection normal?
●
Connector poor contact
●
Correctthe connection
No
YES
No
