Panasonic CS-E18SD3UAW service manual - Page 80

H27 Outdoor Air Temperature Sensor Abnormality

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15.5.9 H27 (Outdoor Air Temperature Sensor Abnormality) Malfunction Decision Conditions  During startup and operation of cooling and heating, the temperatures detected by the outdoor 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 For safety reason and to prevent component breakdown, always switch off the power Caution before remove and connect the component. NO 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 air temperature sensor ● Connector poor contact ● Correct the connection Is the measured resistance of the outdoor air temperature NO sensor matches the value specified in its characteristic chart? YES ● Defect in outdoor air temperature sensor ● Replace the outdoor air temperature sensor ● Defect in outdoor unit PCB ● Replace the outdoor unit PCB Sensor (Thermistor) Characteristics 70 1 Outdoor Air Sensor 60 2 Outdoor Heat Exchanger Sensor 50 40 1 30 20 2 10 0 14 32 50 68 86 104 122 Temperature (ºF) Resistance (kΩ) 80

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15.5.9
H27 (Outdoor Air Temperature Sensor Abnormality)
Malfunction Decision Conditions
During startup and operation of cooling and heating, the temperatures detected by the outdoor 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 outdoor air temperature sensor:
●
Plug out connector from the outdoor unit PCB
●
Measure the resistance of the outdoor 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 air temperature
sensor matches the value specified in its characteristic
chart?
●
●
Replace the outdoor air temperature sensor
●
Defect in outdoor unit PCB
●
Replace the outdoor 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 outdoor air temperature sensor
Sensor (Thermistor)
Characteristics
70
60
50
Resistance (kΩ)
Temperature (ºF)
40
30
20
10
0
1
Outdoor Air Sensor
2
Outdoor Heat Exchanger
Sensor
2
1
Caution
14
32
50
68
86
104
122