Haier 1U12BS3ERA Service Manual page 41

11.4.2 EEPROM abnormal
Indoor Display
outdoor display
Method of
malfunction detection
Malfunction detection
conditions
Supposed causes
Troubleshooting
E4: indoor EEPROM error
F12: Outdoor EEPROM error; Outdoor LED1 flash 1 times
The Data detected by the EEPROM are used to determine MCU
when the data of EEPROM is error or the EEPROM is damaged
Faulty EEPROM data
Faulty EEPROM
Faulty PCB
* Caution Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Replace the indoor or outdoor mainboard
39
Installations
Domestic air conditioner