Eeprom Abnormal - Haier 1U12DR4EAA Service Manual

Check the connector connection.
Thermistor resistance check
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.

8.4.2.2 EEPROM abnormal

Indoor Display E4: indoor EEPROM error
The Data detected by the EEPROM are used to determine MCU
Method of
Malfunction
Detection
When the data of EEPROM is error or the EEPROM is damaged
Malfunction
Detection
Conditions
Supposed
Causes
Yes
* Caution Be sure to turn off power switch before connect or disconnect connector,
Troubleshooting
Is it normal?
Yes
Is it normal?
Faulty EEPROM data
Faulty EEPROM
Faulty PCB
or parts damage may be occurred.
Replace the indoor or outdoor mainboard
NO
Correct the connection
NO
Replace the thermistor
Yes
Replace the indoor unit PCB
16
Service diagnosis
Domestic air conditioner