Troubleshooting by Indication on the Remote Controller Mini UM S/M150 Troubleshooting4.39 “U5” Malfunction of Transmission between RemoteController and Indoor UnitRemoteControllerDisplayU5ApplicableModelsAII indoor unit modelsMethod ofMalfunctionDetectionIn case of controlling with 2-remote controller, check the system using microcomputer is signaltransmission between indoor unit and remote controller (main and sub) is normal.MalfunctionDecisionConditionsNormal transmission does not continue for specified period.SupposedCauses Malfunction of indoor unit remote controller transmission Connection of two main remote controllers (when using 2 remote controllers) Defect of indoor unit PC board Defect of remote controller PC board Malfunction of transmission caused by noiseTroubleshootingCautionBe sure to turn off power switch before connect or disconnect connector,or parts damage may be occurred.(V2823)NOYES YESNOReplace indoor unit PCboard.Set one remote controller to"SLAVE"; turn the powersupply off once and then backon.There is possibility ofmalfunction caused by noise.Check the surrounding areaand turn on again.NO NOUsing2-remote controllerscontrol.All indoorPC board microcomputermonitors blink.YESMulti-core cableis used for the indoorunit remote controllertransmissionwiring.Operationreturns to normal whenthe power is turned offmomentarily.YES YESSS1 ofboth remote controllersis set to "MASTER."NOSwitch to double-coreindependent cable.replacementDefect of remote controller PCboard or indoor unit PC board.Replace whichever isdefective.
