Troubleshooting by Indication on the Remote Controller ESIE09-08186 Troubleshooting3.47 “LC ” Indoor Unit: Malfunction of Transmission betweenInverter and Control PC BoardRemote ControlDisplayLCSubcode 29ApplicableModelsAll indoor unitsMethod ofMalfunctionDetectionCheck the communication state between inverter PC board and control PC board by micro-computer.MalfunctionDecisionConditionsWhen the correct communication is not conducted in certain period.SupposedCauses Malfunction of connection between the inverter microcomputer and indoor controlmicrocomputer Defect of indoor unit PC board [A4P (1 ø) or A5P (3 ø)] External factor (Noise etc.)TroubleshootingCautionBe sure to turn off power switch before connecting or disconnecting connector,otherwise parts may be damaged.Are theconnectors of theinverter PC board and thecontrol PC board securelyconnected?Replace the inverter PC board[A4P (1Ø) or A5P (3Ø)] or the controlPC boardConnect a connecting wire, andthen restart operation.NOAre thereany broken wires inthe connectors of theinverter PC board andthe control PCboard?Repair the broken wires, and thenrestart operation.YESYESNO
