Eeprom Abnormal - Haier D-Series Service Manual

Malfunction
Detection Conditions
Supposed Causes
Troubleshooting
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.

10.4.2 EEPROM abnormal

Indoor Display
Indoor display
Method of
Malfunction Detection
Malfunction
Detection Conditions
Supposed Causes
When the thermistor input is more than 4.92V or less than 0.08V during compressor
operation.
Note: The values vary slightly in some models
■ Faulty connector connection
■ Faulty thermistor
■ Faulty PCB
* Caution Be sure to turn off power switch before connect or disconnect connector, or
else parts damage may be occurred.
Is it normal?
Yes
Is it normal?
E4: Indoor EEPROM error
F12: Outdoor EEPROM error; Outdoor LED1 flash 1 times
The Data detected by the EEPROM are used to determine MCU
When the data of EEPROM is error or the EEPROM is damaged
■ Faulty EEPROM data
■ Faulty EEPROM
■ Faulty PCB
NO
Correct the connection
NO
Replace the thermistor
Yes
Replace the indoor unit PCB
39
Seivice diagnosis
Domestic air conditioner