73
16.4.9 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
Checkthe connector connection:
●
Turn off the power
●
Check the connector connection
Is the connector connection normal?
●
Connector poor contact
●
Correctthe connection
No
YES
No
Caution
For safety reason and to prevent
component breakdown, always switch
off the power before remove and
connect the component.
Summary of Contents for CS-HZ9RKE
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Page 97: ...97 Figure 10 ...