Si34-603 Troubleshooting by Indication on the Remote ControllerTroubleshooting 1413.9 “C4” Indoor Unit: Malfunction of Thermistor (R2T) forHeat ExchangerRemoteControllerDisplayC4ApplicableModelsAll indoor unit modelsMethod ofMalfunctionDetectionMalfunction detection is carried out by temperature detected by heat exchanger thermistor.MalfunctionDecisionConditionsWhen the heat exchanger thermistor becomes disconnected or shorted while the unit is running.SupposedCauses Defect of thermistor (R2T) for liquid pipe Defect of indoor unit PC boardTroubleshooting∗ Refer to thermistor resistance / temperature characteristics table on P231.(V2784)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 (R2T).YESYESConnectoris connected to X12Aof the indoor unit PCboard.Resistanceis normal whenmeasured afterdisconnecting the thermistor(R2T) from the indoorunit PC board(3.5kΩ~360kΩ)
