Haier N Series Service Manual page 52

Service diagnosis
. .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 detection
When the data of EEPROM is error or the EEPROM is damaged
conditions
■ Faulty EEPROM data
Supposed
■ Faulty EEPROM
Causes
■ 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.
Domestic air conditioner