Panasonic CS-E18SD3UAW service manual - Page 74

H14 Indoor Intake Air Temperature Sensor Abnormality

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15.5.3 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 connector connection: ● Turn off the power ● Check the connector connection Is the connector connection normal? YES 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 Is the measured resistance of the indoor intake air temperature sensor matches the value specified in its characteristic chart? YES Sensor (Thermistor) Characteristics 70 1 Pipe temp. Sensor 60 2 Intake Air Temp. Sensor 50 1 40 2 30 20 10 0 14 32 50 68 86 104 122 Temperature (ºF) For safety reason and to prevent component breakdown, always switch off the power Caution before remove and connect the component. NO ● Connector poor contact ● Correct the connection NO ● Defect in indoor intake air tempeature sensor ● Replace the indoor intake air temperature sensor ● Defect in indoor unit PCB ● Replace the indoor unit PCB Resistance (kΩ) 74

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74
15.5.3
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
Sensor (Thermistor)
Characteristics
70
60
50
Resistance (kΩ)
Temperature (ºF)
40
30
20
10
0
1 Pipe temp. Sensor
2 Intake Air Temp. Sensor
1
2
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?
●
●
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
Defect in indoor intake air tempeature sensor
Caution
14
32
50
68
86
104
122