mabe N Series, Service Manaul

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Seivice diagnosis
Domestic air conditioner
The temperatures detected by the thermistors are used to determine thermistor errors
when the thermistor input is more than 4.92V or less than 0.08V during compressor
operation.
Note: The values vary slightly in some models
Faulty connector connection
Faulty thermistor
Faulty PCB
* Caution Be sure to turn off power switch before connect or disconnect connector, or else
parts damage may be occurred.
Thermistor resistance check method:
Remove the connector of the thermistor on the PCB, and measure the resistance of thermistor using tester. The
relationship between normal temperature and resistance is shown in the value of indoor thermistor.
Method of
malfunction tection
Malfunction
detection conditions
*Thermistor
resistance check
Yes
Troubleshooting
E1: Room temperature sensor failure
E2: Heat-exchange sensor failure
LED1 flash 10 times Defrost temperature sensor failure
LED1 flash 11 times Suction temperature sensor failure
LED1 flash 12 times Ambient temperature sensor failure
LED1 flash 13 times Discharge temperature sensor failure
Indoor display
Outdoor display
Thermistor resistance check
Is it normal?
Yes
NO
Yes
Is it normal?
NO
Check the connector onnection
Replace the thermistor
Replace the indoor unit PCB
Correct the connection
8.5. 1 Thermistor or Related Abnormality
LED1 flash 14 times Discharge temperature sensor failure
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