Panasonic CU-4E24RBU - Page 58

58
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
Check the compressor discharge temperature
sensor:
- Plug out connector from the outdoor unit PCB
- Measure the resistance of the compressor
discharge temperature sensor
- Defect in compressor
discharge temperature sensor
- Replace the compressor
discharge temperature sensor
Yes
Is the measured resistance of the
compressor discharge temperature
sensor matches the value specified in
its characteristic chart?
No
Check the CN-DIS connector connection:
- Turn OFF the power
- Check the connector connection
- Connector poor contact
- Correct the connection
No
Is the CN-DIS connector
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.
Compressor / DischargeTemp. Sensor
(Thermistor) Characteristics
70
60
50
R
esistance (
k
Ω
)
40
30
20
10
0
T
e
m
pe
r
atu
r
e
°
C
(
°
F
)
20
(68)
40
(104)
60
(140)
80
(176)
100
(212)
120
(248)
140
(284)