Service diagnosis
31 Domestic air conditioner
10.3.1 Thermistor or Related Abnormality
Indoor Display E1: Room temperature sensor failure
E2: Heat
●
-exchange sensor failure
Outdoor display 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
Method of The temperatures detected by the thermistors are used to determine thermistor errors
Malfunction
Detection
Malfunction When the thermistor input is more than 4.92V or less than 0.08V during compressor
Decisi
on
operation.
Conditions
z Note: The values vary slightly in some model
s
Suppo
sed ■ Faulty connector connection
Causes ■ Faulty thermistor
●
■ F
aulty PCB
Troublesho
oting *
Caution Be sure to turn off power switch before connect or disconnect connector,
or
●
else parts damage may be occurred.
Thermistor resistance chec
●
k 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
Is it normal?
Ye
s
NO
Yes
Is it normal?
NO
Check the connector connection.
Replace the thermistor
Replace the indoor unit PCB
Correct the connection
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