Mini UM S/M Troubleshooting by Indication on the Remote ControllerTroubleshooting 1174.11 “C9” Indoor Unit: Malfunction of Thermistor (R1T) forSuction AirRemoteControllerDisplayC9ApplicableModelsAII indoor unit modelsMethod ofMalfunctionDetectionMalfunction detection is carried out by temperature detected by suction air temperaturethermistor.MalfunctionDecisionConditionsWhen the suction air temperature thermistor becomes disconnected or shorted while the unit isrunning.SupposedCauses Defect of indoor unit thermistor (R1T) for air inlet Defect of indoor unit PC boardTroubleshooting∗ Refer to thermistor resistance / temperature characteristics table on P190.CautionBe sure to turn off power switch before connect or disconnect connector,or parts damage may be occurred.Replace the indoor unit PC board.Connect the thermistor and turnon again.NONOReplace the thermistor (R1T).YESYESConnectoris connected to X13Aof the indoor unitPC board.Resistanceis normal whenmeasured afterdisconnecting the thermistor(R1T) from the indoorunit PC board.(7.2kΩ~112kΩ)(V2786)
