Haier AS09TA2HRA Service Manual page 32

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
Causes
Troubleshooting * Caution Be sure to turn off power switch before connect or disconnect connector, or
parts damage may be occurred.
Faulty EEPROM data
Faulty EEPROM
Faulty PCB
Replace the indoor or outdoor mainboard.
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Service diagnosis
Domestic air conditioner