Seivice diagnosis
Domestic air conditioner
11.4.1 Thermistor or Related Abnormality
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.
z Note: The values vary slightly in some models
Ŷ Faulty connector connection
Ŷ Faulty thermistor
Ŷ 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.
*Thermistor resistance check
Yes
NO
Yes
Check the connector connection,
whether if it loose or misplug
Re-connect
NO
Replace the thermistor
Replace the indoor PCB
Is the resistance is conformity
with normal temperature
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
Method of
malfunction detection
Malfunction detection
conditions
Troubleshooting
Supposed causes
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