Panasonic CU-3E19RBU-5 Service Manual page 68

15.2.3 H15 (Compressor Temperature Sensor Abnormality)
Malfunction Decision Conditions

During startup and operation of cooling and heating, the temperatures detected by the compressor discharge
temperature sensor are used to determine sensor errors.
Malfunction Caused

Faulty connector connection.

Faulty sensor.

Faulty outdoor unit PCB.
Abnormality Judgment:

Continue for 5 seconds.
Troubleshooting
Compressor / DischargeTemp. Sensor
(Thermistor) Characteristics
70
60
50
40
30
20
10
0
20 40 60 80 100 120
(68) (104) (140) (176) (212) (248)
Temperature °C (°F)
Caution
Check the CN-DIS connector connection:
- Turn OFF the power
- Check the connector connection
Is the CN-DIS connector
connection normal?
Check the compressor discharge temperature
sensor:
- Plug out connector from the outdoor unit PCB
- Measure the resistance of the compressor
discharge temperature sensor
Is the measured resistance of the
compressor discharge temperature
sensor matches the value specified in
its characteristic chart?
140
(284)
For safety reason and to prevent component
breakdown, always switch off the power
before remove and connect the component.
No
Yes
No
Yes
68
- Connector poor contact
- Correct the connection
- Defect in compressor
discharge temperature sensor
- Replace the compressor
discharge temperature sensor
- Defect in outdoor unit PCB
- Replace the outdoor unit PCB