Panasonic CS-E12RB4UW, Service Manual

Page: 63 / 109

63
15.4.3 H14 (Indoor Intake Air Temperature Sensor Abnormality)
Malfunction Decision Conditions

During startup and operation of cooling and heating, the temperatures detected by the indoor intake air
temperature sensor are used to determine sensor errors.
Malfunction Caused

Faulty connector connection.

Faulty sensor.

Faulty PCB.
Troubleshooting
When abnormality indication starts again.
Check the indoor intake air temperature sensor:
•
Plug out connector from the indoor unit PCB.
• Measure the resistance of the indoor intake air
temperature sensor.
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 indoor intake air
temperature sensor matches the value specified in its
characteristic chart?
• Defect in indoor intake air temperature sensor.
• Replace the indoor intake air temperature
sensor.
• Defect in indoor unit PCB.
• Replace the indoor unit PCB.
Check the connector connection:
•
Turn off the power.
• Check the connector connection.
Is the connector connection normal?
YES
• Connector poor contact.
• Correct the connection.
NO
NO
YES
Sensor (Thermistor)
Characteristics
70
60
50
R
es
is
ta
n
c
e(
k
Ω
)
Temperature °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
Caution