Panasonic CU-3E19RBU-5 Service Manual page 74

15.2.9 H36 (Outdoor Gas Pipe Temperature Sensor Abnormality)
Malfunction Decision Conditions

During startup and operation of cooling and heating, the temperatures detected by the outdoor gas pipe
temperature sensor are used to determine sensor errors.
Malfunction Caused

Faulty connector connection.

Faulty sensor.

Faulty PCB.
Abnormality Judgment:

Continue for 5 seconds.
Troubleshooting
Sensor (Thermistor)
Characteristics
70
1
Outdoor Air Sensor
2
Outdoor Heat Exchanger
60
Sensor
50
40
1
30
2
20
10
0
-10 0 10 20 30
(14) (32) (50) (68) (86)
Temperature °C (°F)
Caution
Check the connector connection:
- Turn off the power
- Check the connector connection
Is the connector
connection normal?
Check the outdoor gas pipe temperature sensor:
- Plug out connector from the outdoor unit PCB
- Measure the resistance of the outdoor gas pipe
temperature sensor
Is the measured resistance of the
outdoor gas pipe temperature
sensor matches the value
specified in its characteristic chart?
40 50
(104) (122)
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
No
Yes
No
Yes
74
- Connector poor contact
- Correct the connection
- Defect in outdoor gas pipe
temperature sensor
- Replace the outdoor gas pipe
temperature sensor
- Defect in outdoor unit PCB
- Replace the outdoor unit PCB