Thermistor Or Related Abnormality; Indoor Display; Outdoor Display - Haier AS12GB3HRA Service Manual

11.4.1 Thermistor or Related Abnormality

Indoor Display

Outdoor display

Method of
malfunction
detection
Malfunction
detection
conditions
Supposed
causes
Troubleshooting
*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.
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
The temperatures are detected by the thermistror which are used to
determine the errors
When the thermistor input voltage is more than 4.92V or less than 0.08V
during compressor operation
The values vary slightly in some models
Faulty connector connection
Faulty thermistor
Faulty PCB
Be sure to turn off power switch before connect or disconnect connector, or
else
parts damage may be caused
Check the connector connection,
whether if it loose or misplug
Thermistor resistance check
Is the resistance is conformity
with normal temperature
NO
YES
36
YES
Re-connect
NO
Replace the thermistor
Replace the indoor PCB
Domestic air conditioner
Service diagnosis