Panasonic CS-CZ25WKE - Page 91

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17.5.7 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
Resistance (kΩ)
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 indoor air temperature sensor:
● Plug out connector from the indoor unit PCB
● Measure the resistance of the indoor intake air
temperature sensor
● Defect in indoor intake air temperature sensor
● Replace the indoor intake air temperature
sensor
● Detect in indoor unit PCB
● Replace the indoor 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 indoor intake air
temperature sensor matches the value specified in its
characteristic chart?
NO
YES
Caution