Haier 1U12BS3ERA Service Manual page 40

11.4.1 Thermistor or Related Abnormality
Indoor display
Outdoor display
Method of
malfunction detection
Malfunction detection
conditions
Supposed causes
Troubleshooting
Check the connector connection,
whether if it loose or misplug
*Thermistor resistance check
Is the resistance is conformity
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 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,
NO
with normal temperature
parts damage may be occurred.
Yes
NO
Replace the thermistor
Yes
Replace the indoor PCB
38
Re-connect
Domestic air conditioner
Installations
or else