ESIE09-08 Troubleshooting by Indication on the Remote ControllerTroubleshooting 1673.28 “J5” Indoor Unit: Malfunction of Thermistor (R7T) forLiquid R-134aRemote ControlDisplayJ5Subcode 11ApplicableModelsAll indoor unitsMethod ofMalfunctionDetectionMalfunction is detected from the temperature detected by the thermistor for liquid pipe.MalfunctionDecisionConditionsWhen a short circuit or an open circuit in the thermistor for liquid pipe are detected.SupposedCauses Defect of thermistor (R7T) for liquid R134a Defect of indoor unit PC board (A4P)Troubleshooting∗ Refer to thermistor resistance / temperature characteristics table on P229.CautionBe sure to turn off power switch before connecting or disconnecting connector,otherwise parts may be damaged.Resistanceis normalwhen measuredafter disconnecting thethermistor (R7T) from theindoor unit PC board.(3.5k ~360k )Replace indoor unit PC board(A4P).Connect the thermistor and turnon again.NONOReplace the thermistor (R7T).YESYESConnector ofthe thermistor forliquid pipe is connected toX12A [3,4] of indoorunit PC board(A1P).Bad wire connectionvalue < -43.6˚CFaulty thermistorvalue > 165˚C
