Haier HSU12VHG-B Service Manual page 61

HSU129HG(DB)-SM Service Diagnosis
7.3.7 EEPROM abnormal
Indoor Display E4 Indoor EEPROM error
F12 Outdoor EEPROM error 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.
Check the EEPROM of the indoor or outdoor mainboard , and be sure it is right.
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Domestic Air Conditioner