Domestic air conditioner
Troubleshooting * Caution Be sure to turn off power switch before connect or disconnect connector,
or else parts damage may be occurred.
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.
10.4.2.2 EEPROM abnormal
Indoor Display E4: indoor EEPROM error
Method of The Data detected by the EEPROM are used to determine MCU
Malfunction
Malfunction When the data of EEPR OM is error or the EEPROM is damaged
Decision
Supposed Ŷ Faulty EEPROM data
Causes Ŷ Faulty EEPROM
Ŷ Faulty PCB
Troubleshooting * 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
Method of
Malfunction
Detection
Malfunction
Detection
Conditions
Supposed
Causes
Yes
Troubleshooting
Service diagnosis
29
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