Panasonic CS-E18SD3UAW service manual - Page 75

H15 Compressor Temperature Sensor Abnormality

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15.5.4 H15 (Compressor Temperature Sensor Abnormality) Malfunction Decision Conditions  During startup and operation of cooling and heating, the temperatures detected by the outdoor compressor 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 outdoor compressor temperature sensor: ● Plug out connector from the outdoor unit PCB ● Measure the resistance of the outdoor compressor temperature sensor 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 Is the measured resistance of the outdoor compressor temperature sensor matches the value specified in its characteristic chart? YES Compressor Temp. Sensor (Thermistor) Characteristics 70 60 50 40 30 20 10 0 68 104 140 176 212 248 284 Temperature (oF) NO ● Defect in outdoor compressor temperature sensor ● Replace the outdoor compressor temperature sensor ● Defect in outdoor unit PCB ● Replace the outdoor unit PCB Resistance (kΩ) 75

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75
15.5.4
H15 (Compressor Temperature Sensor Abnormality)
Malfunction Decision Conditions
During startup and operation of cooling and heating, the temperatures detected by the outdoor compressor
temperature sensor are used to determine sensor errors.
Malfunction Caused
Faulty connector connection.
Faulty sensor.
Faulty PCB.
Troubleshooting
Compressor Temp. Sensor
(Thermistor) Characteristics
70
60
50
40
30
20
10
0
Temperature (
o
F)
Resistance (kΩ)
68
104
140
176
212
248
284
When abnormality indication starts again
Check the outdoor compressor temperature sensor:
●
Plug out connector from the outdoor unit PCB
●
Measure the resistance of the outdoor compressor
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 compressor
temperature sensor matches the value specified in its
characteristic chart?
●
●
Replace the outdoor compressor 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 compressor temperature sensor
Caution