ESIE05-03 Error Codes: System MalfunctionsPart 3 – Troubleshooting 3–99334514.4 Malfunction of Transmission between MAIN Remote Controllerand SUB Remote Controller (U8)Error code U8Error generation The error is generated when, in case of controlling with two remote controllers, the microprocessordetects that the transmission between the indoor unit and the remote controllers (MAIN and SUB) isnot normal over a certain amount of time.Causes The possible causes are:P Transmission error between MAIN remote controller and SUB remote controllerP Connection among SUB remote controllersP Malfunctioning remote controller PCB.TroubleshootingCaution Be sure to turn off power switch before connect or disconnect connector, or parts damage may beoccurred.Turn the SS-1 switch of oneremote controller to MAIN.Turn OFF the power supply,and restart operation.Turn OFF the power once andrestart operation.Replace remote controller PCBif any error is generated.Turn the SS-1switch of oneremote controller to MAIN.Turn OFF the power supply,and restart operation.Replace the remote controllerwiring.Controllingwith 2-remotecontrollerBoth SS-1switches on remotecontrollers are turnedto SUBIs therecontinuity in remotecontroller wiring?SS-1switch on remotecontroller PCB is turnedto MAINNO NOYESNOYES YESYESNO
