Haier N-Series Service Manual page 37

Check the connector connection.
Thermistor resistance check
Thermistor resistance check method:
Remove the connector of the thermistor on the PCB, and measure the resistance of thermistor using tester. The
relationship between normal temperature and resistance is shown in the value of indoor thermistor.
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 MCU are used to determine MCU
Malfunction
Detection
Malfunction when the data of EEPROM is error or the EEPROM is damaged
Decision
Conditions
■ Faulty EEPROM data
Supposed
■ Faulty EEPROM
Causes
■ Faulty PCB
Troubleshooting * Caution Be sure to turn off power switch before connect or disconnect connector,
parts damage may be occurred.
Is it normal?
Yes
Is it normal?
Yes
Replace the indoor or outdoor mainboard
NO
Correct the connection
NO
Replace the thermistor
Replace the indoor unit PCB
35
Seivice diagnosis
or
Domestic air conditioner