Panasonic CU-5E36QBU-5, Service Manual

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62
15.2.10 H37 (Outdoor Liquid Pipe Temperature Sensor Abnormality)
Malfunction Decision Conditions

During startup and operation of cooling and heating, the temperatures detected by the outdoor liquid 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
Check the outdoor liquid pipe temperature sensor:
- Plug out connector from the outdoor unit PCB
- Measure the resistance of the outdoor liquid pipe
temperature sensor
- Defect in outdoor liquid pipe
temperature sensor
- Replace the outdoor liquid
pipe temperature sensor
Yes
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Is the measured resistance of the
outdoor liquid pipe temperature
sensor matches the value
specified in its characteristic chart?
No
Check the connector connection:
- Turn off the power
- Check the connector connection
- Connector poor contact
- Correct the connection
No
Is the connector
connection normal?
- Defect in outdoor unit PCB
- Replace the outdoor unit PCB
Yes
Sensor (Thermistor)
Characteristics
Outdoor Air Sensor
Outdoor Heat Exchanger
Sensor
1
2
1
2
70
60
50
40
30
20
-10
(14)
0
(32)
10
(50)
20
(68)
30
(86)
40
(104)
50
(122)
10
0
Re
s
is
ta
n
c
e
(k
Ω
)
Temperature °C (°F)
Caution