3-51Control of 2WAY SYSTEM1234567893. Timer Remote ControllerMeaning of Alarm MessagesTable of Self-Diagnostics Functions and Description of Alarm DisplaysContinuedPossible cause of malfunction AlarmmessageSerialcommunicationerrorsMis-settingRemote controller is detectingerror signal from indoor unit.Error in receiving serial communication signal.(Signal from main indoor unit in case of group control)Ex: Auto address is not completed.Error in transmitting serial communication signal. Indoor unit is detecting error signal from remote controller (and system controller).Indoor unit is detecting errorsignal from main outdoor unit.Error in receiving serial communication signal.When turning on the power supply, the number of connected indoorunits does not correspond to the number set.(Except R.C. address is “0.”)E04Error of the main outdoor unit in receiving serial communicationsignal from the indoor unit. Improper setting of indoor unitor remote controller.Indoor unit address setting is duplicated. E08Remote controller address connector (RCU. ADR) is duplicated.(Duplication of main remote controller) <>During auto address setting,number of connected units doesnot correspond to number set.When turning on the powersupply, number of connectedunits does not correspond tonumber set.(Except R.C. address is “0.”)Starting auto address setting is prohibited.This alarm message shows that the auto address connector CN054 isshorted while other RC line is executing auto address operation.E12Error in auto address setting. (Number of connected indoor units isless than the number set.) E15Error in auto address setting.(Number of connected indoor units is more than the number set.) E16No indoor unit is connected during auto address setting. E20Main outdoor unit is detecting error signal from sub outdoor unit. E24Error of outdoor unit address setting. E25The number of connected main and sub outdoor units do notcorrespond to the number set at main outdoor unit PCB. E26Improper wiring between main outdoor unit and sub-unit. E27Error of sub outdoor unit in receiving serial communication signalfrom main outdoor unit. E29E30Serial transmission failure of outdoor unit.Communications troublebetween units E31Communication failure with MDCIndoor unit communicationerror of group control wiring.Error of main indoor unit in receiving serial communication signalfrom sub indoor units. E18<>
