Si04-115 Trouble shootingService Diagnosis 695.4 Operation Halt Due to Detection of Thermistor or RelatedAbnormalityRemoteControllerDisplayC4,C4,C4,C4, C9,C9,C9,C9, CACACACAIndoor unit LEDDisplayMethod ofMalfunctionDetectionThe temperatures detected by the thermistors are used to determine thermistor errors.MalfunctionDecisionConditionsWhen the thermistor input is more than 4.96 V or less than 0.04 V during compressoroperation∗.∗ (reference)When above about 212°C (less than 120 Ω) or below about -50°C (more than 1,860 kΩ).Note: The values vary slightly in some models.SupposedCauses" Faulty connector connection" Faulty thermistor" Faulty PCBTroubleshootingCheck No.5Refer to P.88C4 : Heat exchanger temperature thermistorC9 : Suction air thermistorCA : Discharge air thermistorCheck the connector connection.YESCorrect the connection.Replace the thermistor.(Replace the indoor unit PCB.)Replace the indoor unit PCB.Is it normal?Is it normal?(R1947)NOCheck No. 5Thermistor resistance checkYESNOCautionBe sure to turn off power switch before connect or disconnect connector,or parts damage may be occurred.
