Troubleshooting SiBE07-618_C82 Service Diagnosis4.19 Thermistor or Related Abnormality (Outdoor Unit)RemoteControllerDisplayH9, J3, J6, P4Method ofMalfunctionDetectionThis type of error is detected by checking the thermistor input voltage to the microcomputer.A thermistor error is detected by checking the temperature sensed by each thermistor.MalfunctionDecisionConditions The thermistor input voltage is above 4.96 V or below 0.04 V with the power on. J3 error is judged if the discharge pipe temperature is lower than the outdoor heat exchangertemperature.SupposedCauses Disconnection of the connector for the thermistor Defective thermistor Defective heat exchanger thermistor in the case of J3 error (outdoor heat exchangerthermistor in cooling operation, or indoor heat exchanger thermistor in heating operation) Defective outdoor unit PCB Defective indoor unit PCBTroubleshooting In case of “P4”Replace the outdoor unit PCB.P4 : Radiation fin thermistorCautionBe sure to turn off the power switch before connecting or disconnectingconnectors, or parts may be damaged.
