Seivice diagnosisDomestic air conditioner11.4.1 Thermistor or Related AbnormalityThe temperatures detected by the thermistors are used to determine thermistor errorswhen the thermistor input is more than 4.92V or less than 0.08V during compressoroperation.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 elseparts 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. Therelationship between normal temperature and resistance is shown in the value of indoor thermistor.Method ofmalfunction tectionMalfunctiondetection conditions*Thermistorresistance checkYesTroubleshootingE1: Room temperature sensor failureE2: Heat-exchange sensor failureLED1 flash 10 times：Defrost temperature sensor failureLED1 flash 11 times：Suction temperature sensor failureLED1 flash 12 times：Ambient temperature sensor failureLED1 flash 13 times：Discharge temperature sensor failureIndoor displayOutdoor display40Thermistor resistance checkIs it normal?YESNOYESIs it normal?NOCheck the connector onnectionReplace the thermistorReplace the indoor unit PCBCorrect the connection
