Haier 1U25YEEFRA Manual page 34

10.3.2 EEPROM abnormal
Indoor Display E4: Indoor EEPROM error
Indoor display F12: Outdoor EEPROM error; Outdoor LED1 flash 1 times
Method of The Data detected by the EEPROM are used to determine MCU
Malfunction
Detection
Malfunction When the data of EEPROM is error or the EEPROM is damaged
Decision
●
Conditions
Supposed ■ Faulty EEPROM data
Causes ■ Faulty EEPROM
■ Faulty PCB
Troubleshooting * 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.
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Service diagnosis
Domestic air conditioner