SiEBE18-526 Troubleshooting for SkyAir Indoor UnitTroubleshooting 2795.9 Malfunction of Heat Exchanger Thermistor (R3T)RemoteControllerDisplayC5ApplicableModelsFFQ-B, FHQ-BUMethod ofMalfunctionDetectionMalfunction detection is carried out by temperature detected by heat exchanger sensor (R3T).MalfunctionDecisionConditionsWhen the heat exchanger thermistor becomes disconnected or shorted while the unit is running.SupposedCauses Failure of the sensor itself Broken or disconnected wire Failure of electronic circuitry (indoor unit PCB) Failure of connector contactTroubleshootingCheck No.02Refer to P.286Disconnect the heat exchangesensor (R3T) from X17A onthe indoor unit PC board andmeasure the resistance.Connect correctly.Heat exchangersensor replacement.If contact is OK,replace indoor unitPCB.Is thethermistor normal?(See note)NONOYESYES(Q0417)Check contact of connectorIs it normal?HSee Check No. 02 for “Thermistor temperature and resistance characteristics”.CautionBe sure to turn off power switch before connect or disconnect connector,or parts damage may be occurred.
