Domestic air conditioner
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.
8.4.2.2 EEPROM abnormal
Indoor Display E4: indoor EEPROM error
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
* Caution Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Thermistor resistance check
Is it normal?
Yes
NO
Yes
Is it normal?
NO
Check the connector connection.
Replace the thermistor
Replace the indoor unit PCB
Correct the connection
Replace the indoor or outdoor mainboard
Service diagnosis
16
Method of
Malfunction
Detection
Malfunction
Detection
Conditions
Supposed
Causes
Yes Troubleshooting
