Panasonic CS-Z20TKR Service Manual page 120

17.4.3 H14 (Indoor Intake Air Temperature Sensor Abnormality)
Malfunction Decision Conditions

During startup and operation of cooling and heating, the temperatures detected by the indoor intake air
temperature sensor are used to determine sensor errors.
Malfunction Caused

Faulty connector connection.

Faulty sensor.

Faulty PCB.
Troubleshooting
When abnormality indication starts again.
Check the connector connection:
Turn off the power.
Check the connector connection.
Is the connector connection normal?
Check the indoor intake air temperature sensor:
Plug out connector from the indoor unit PCB.
Measure the resistance of the indoor intake air
temperature sensor.
Is the measured resistance of the indoor intake air
temperature sensor matches the value specified in its
characteristic chart?
Sensor (Thermistor)
Characteristics
70
1 Pipe temp. Sensor
60
2 Intake Air Temp. Sensor Intake Air Temp. Sensor
50
1
40
2
30
20
10
0
-10 0 10 20
Temperature (°C)
YES
YES
30 40 50
For safety reason and to prevent component
breakdown, always switch off the power
before remove and connect the component.
NO
Connector poor contact.
Correct the connection.
NO
Defect in indoor intake air temperature sensor.
Replace the indoor intake air temperature sensor.
Defect in indoor unit PCB.
Replace the indoor unit PCB.
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