Haier 1U35MEHFRA-1 Service Manual

Also see for 1U35MEHFRA-1: Service manual

Service diagnosis33 Domestic air conditioner10.3.1 Thermistor or Related AbnormalityIndoor Display ★ ■ ■/ E1: Room temperature sensor failure★ □ □/ E2: 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 compressorDecision operation.Conditionsz Note: The values vary slightly in some modelsSupposed Ŷ Faulty connector connectionCauses Ŷ Faulty thermistorŶ 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 connection.Replace the thermistorReplace the indoor unit PCBCorrect the connection