Panasonic CS-E18SD3UAW service manual - Page 78

H23 Indoor Pipe Temperature Sensor Abnormality

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15.5.7 H23 (Indoor Pipe Temperature Sensor Abnormality) Malfunction Decision Conditions  During startup and operation of cooling and heating, the temperatures detected by the indoor heat exchanger 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: ● Plug out connector from the indoor unit PCB ● Measure the resistance of the indoor pipe temperature sensor For safety reason and to prevent component breakdown, always switch off the power Caution before remove and connect the component. Is the connector connection normal? YES Check the outdoor air temperature sensor: ● Plug out connector from the outdoor unit PCB ● Measure the resistance of the outdoor intake air temperature sensor NO ● Connector poor contact ● Correct the connection Is the measured resistance of the outdoor 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) NO ● Defect in outdoor intake air temperature sensor ● Replace the outdoor intake air temperature sensor ● Defect in outdoor unit PCB ● Replace the outdoor unit PCB Resistance (kΩ) 78

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78
15.5.7
H23 (Indoor Pipe Temperature Sensor Abnormality)
Malfunction Decision Conditions
During startup and operation of cooling and heating, the temperatures detected by the indoor heat exchanger
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 outdoor air temperature sensor:
●
Plug out connector from the outdoor unit PCB
●
Measure the resistance of the outdoor 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 outdoor intake air
temperature sensor matches the value specified in its
characteristic chart?
●
●
Replace the outdoor intake air temperature
sensor
●
Defect in outdoor unit PCB
●
Replace the outdoor unit PCB
Check the connector connection:
●
Plug out connector from the indoor unit PCB
●
Measure the resistance of the indoor pipe temperature
sensor
Is the connector connection normal?
YES
●
Connector poor contact
●
Correct the connection
NO
NO
YES
Defect in outdoor intake air temperature sensor
Caution
14
32
50
68
86
104
122