CS-E7RKDW, CS-E9RKDW, CS-E12RKDW, CS-E15RKDW, CS-E18RKDW, CS-E24RKDW, CS-E28RKDS, CU-E7RKD, CU-E9RKD, CU-E12RKD, CU-E15RKD, CU-E18RKD, CU-E24RKD, CU-E28RKD - Panasonic Air Conditioner Service Manual (repair manual). Page 124

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124 
17.4.9  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 
 
 
 
 
 
 
 
 
 
 
 
 
Check the connector connection:
Is the measured resistance of the outdoor air temperature
sensor matches the value specified in its characteristic
chart?
Is the connector connection normal?
When abnormality indication starts again.
For safety reason and to prevent component
breakdown, always switch off the power
before remove and connect the component.
Turn off the power.
Check the connector connection.
Defect in outdoor air temperature sensor.
Replace the outdoor air temperature sensor.
Defect in outdoor unit PCB.
Replace the outdoor unit PCB.
NO
NO
YES
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.
0
10
-10
10
20
30
40 50
0
20
30
40
50
60
70
Temperature (°C)
Re
si
sta
nce
(K

)
Sensor (Thermistor)
Characteristics




Outdoor Air Sensor
Outdoor Heat Exchanger
Sensor

Display

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