Panasonic CS-Z35UD3RAW - H24: Indoor Pipe Temperature Sensor 2 Abnormality

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18.4.8 H24 (Indoor Pipe Temperature Sensor 2 Abnormality)
Malfunction Decision Conditions
 During startup and operation of cooling and heating, the temperatures detected by the indoor heat exchanger
temperature sensor 2 are used to determine sensor errors.
Malfunction Caused
 Faulty connector connection.
 Faulty sensor.
 Faulty PCB.
Troubleshooting
When abnormality indication starts again.
For safety reason and to prevent component
breakdown, always switch off the power
before remove and connect the component.
Connector poor contact.
Correct the connection.
Defect in outdoor unit PCB.
Replace the outdoor unit PCB.
Defect in outdoor intake air temperature sensor.
Replace the outdoor intake air temperature
sensor.
NO
NO
YES
YES
Check the connector connection:
Plug out connector from the indoor unit PCB.
Is the connector connection normal?
Measure the resistance of the indoor pipe temperature
sensor.
Check the outdoor air temperature sensor:
Is the measured resistance of the outdoor intake air
temperature sensor matches the value specified in its
characteristic chart?
Plug out connector from the outdoor unit PCB.
Measure the resistance of the outdoor intake air
temperature sensor.
Caution
Sensor (Thermistor)
Characteristics
70
60
50
R
e
s
i
s
t
a
n
ce
(
k
Ω)
T
e
m
p
e
r
a
t
u
r
e
°
C
(
°
F
)
40
30
20
10
-10
(14)
0
(32)
10
(50)
20
(68)
30
(86)
40
(104)
50
(122)
0
1 Pipe temp. Sensor
2 Intake Air Temp. Sensor
1
2