Panasonic CU-4E24RBU - Page 62

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15.2.7 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 pipe temperature
sensor 2 are used to determine sensor errors.
Malfunction Caused
 Faulty connector connection.
 Faulty sensor.
 Faulty outdoor unit PCB.
Abnormality Judgment:
 Continue for 5 seconds.
Troubleshooting
Check the outdoor pipe temperature sensor 2:
- Plug out connector from the outdoor unit PCB
- Measure the resistance of the outdoor pipe
temperature sensor 2
- Defect in outdoor pipe
temperature sensor 2
- Replace the outdoor pipe
temperature sensor 2
Yes
Is the measured resistance of the
outdoor pipe temperature sensor
2 matches the value specified in
its characteristic chart?
No
Check the CN-TH2 connector connection:
-TurnOFFthepower
- Check the connector connection
-Connectorpoorcontact
- Correct the connection
No
IstheCN-TH2connector
connection normal?
- Defect in outdoor unit PCB
- Replace the outdoor unit PCB
Yes
For safety reason and to prevent component
breakdown, always switch off the power
before remove and connect the component.
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
Resistance (kΩ )
Temperature °C (°F)