Haier HSU-18LEK03/R2 Service Manual

Service Diagnosis47 Domestic Air Conditioner7.4.1 Thermistor or Related AbnormalityIndoor Display E1: Room temperature sensor failureE2: Heat-exchange sensor failureoutdoor display LED1 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 failureMethod of The temperatures detected by the thermistors are used to determine thermistor errorsMalfunctionDetectionMalfunction when the thermistor input is more than 4.92V or less than 0.08V during compressor.noitareponoisiceDConditionsNote: The values vary slightly in some modelsSupposed ■ Faulty connector connectionCauses ■ Faulty thermistor■ Faulty PCBTroubleshooting * Caution Be sure to turn off power switch before connect or disconnect connector, orelse 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.Therelationship between normal temperature and resistance is shown in the value of indoor thermistor.Thermistor resistance checkIs it normal?YesNOYesIs it normal?NOCheck the connector onnection.Replace the thermistorReplace the indoor unit PCBCorrect the connection