Panasonic CU-4Z80TBE Service Manual page 296

16.2.7 H32 (Outdoor Heat Exchanger Temperature Sensor 2 Abnormality)
Malfunction Decision Conditions

During startup and operation of cooling and heating, the temperatures detected by the outdoor heat exchanger
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 heat exchanger
temperature sensor matches the value specified in its
characteristic chart?
YES
YES
296
For safety reason and to prevent
component breakdown, always switch
Caution
off the power before remove and
connect the component.
NO ● Connector poor contact
● Correct the connection
● Defect in outdoor discharge pipe
NO temperature sensor
● Replace the outdoor discharge pipe
temperature sensor
● Defect in outdoor unit PCB
● Replace the outdoor unit PCB