Panasonic CS-PS9JKT, Service Manual

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14.4.7 H23 (Indoor Pipe Temperature Sensor Abnormality)
Malfunction Decision Conditions
•
During startup and operation of cooling and heating, the temperatures detected by the indoor heat exchanger
temperature sensor are used to determine sensor errors.
Malfunction Caused
•
Faulty connector connection.
•
Faulty sensor.
•
Faulty PCB.
Troubleshooting
Sensor (Thermistor)
Characteristics
70
60
50
R
esi
st
an
ce
(k
Ω
)
Temperature (ºC)
40
30
20
10
-10 0 10 20 30 40 50
0
1 Pipe temp. Sensor
2 Intake Air Temp. Sensor
1
2
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 intake air
temperature sensor
•
Defect in outdoor intake air temperature sensor
•
Replace the outdoor intake air temperature
sensor
•
Detect in 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.
Check the connector connection:
•
Plug out connector from the indoor unit PCB
•
Measure the resistance of the indoor pipe temperature
sensor
Is the connector connection normal?
•
Connector poor contact
•
Correct the connection
YES
NO
Is the measured resistance of the outdoor intake air
temperature sensor matches the value specified in its
characteristic chart?
NO
YES