Panasonic CS-Z20VKR Service Manual page 128

17.4.11 H30 (Compressor Discharge Temperature Sensor Abnormality)
Malfunction Decision Conditions

During startup and operation of cooling and heating, the temperatures detected by the outdoor discharge pipe
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 outdoor discharge pipe temperature sensor:
Plug out connector from the outdoor unit PCB.
Measure the resistance of the outdoor discharge pipe
temperature sensor.
Is the measured resistance of the outdoor discharge pipe
temperature sensor matches the value specified in its
characteristic chart?
Compressor Temp. Sensor
(Thermistor) Charateristics
70
60
50
40
30
20
10
0
20 40
YES
YES
60 80 100 120 140
Temperature (°C)
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.
Defect in outdoor discharge pipe
temperature sensor.
NO
Replace the outdoor discharge pipe
temperature sensor.
Defect in outdoor unit PCB.
Replace the outdoor unit PCB.
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