Panasonic CS-MS9SD3H Service Manual page 45

13.5.3 H14 (Indoor Intake Air Temperature Sensor Abnormality)
Malfunction Decision Conditions

During startup and operation of cooling, 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
50
1
40
2
30
20
10
0
-10 0 10 20
Temperature (ºC)
YES
YES
30 40 50
For safety reason and to prevent component
breakdown, always switch off the power
Caution
before remove and connect the component.
NO
● Connector poor contact
● Correct the connection
NO
●
Defect in indoor intake air tempeature sensor
● Replace the indoor intake air temperature
sensor
● Defect in indoor unit PCB
● Replace the indoor unit PCB
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