LG Electronics LA121HPMI, LAU121CNM, LAN121CNM service manual When Vertical Louver does not operate

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Troubleshooting Guide

When Vertical Louver does not operate.

•Confirm that the Vertical Louver is normally geared with the shaft of Stepping Motor.

•If the regular torque is detected when rotating the Vertical Louver with hands Normal

•Check the connecting condition of CN-UP/DOWN Connector

•Check the soldering condition(on PWB) of CN-UP/DOWN Connector

Check the operating circuit of the Vertical Louver

•Confirm that there is DC +12V between pin(RED) of CN-UP/DOWN and GND.

•Confirm that there is a soldering short at following terminals.

- Between 77	, 78	, 79 and 80		of MICOM
- Between 4	, 5	, 6	and 7	of IC01M
- Between 10	, 11	, 12	and 13 of IC01M
- Between 1	, 2	, 3	, 4 and 5 of CN-UP/DOWN

If there are no problems after above checks

•Confirm the assembly conditions that are catching and interfering parts in the rotation radial of the Vertical Louver

54Room Air Conditioner

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Contents Room Air Conditioner Table of Contents Do not modify or extend the power cord Safety PrecautionsInstallation Be sure not to do Be sure to follow the instructionOperation Moisture may condense and wet or damage furnishings Keep level even when installing the product Do not direct airflow at room occupants Do not block the inlet or outlet of air flowDisuse Do not drink the water drained from the unitReplace all the batteries in the remote Dimensions Symbols Used in this ManualIndoor Unit Outdoor Unit 12kFeatures IntroductionInstallation Installation PartsInstallation Tools Installation Map Bushing-SleeveConfirm The Refrigerant This Product Contains R-410A RefrigerantRooftop Installations Indoor unitOutdoor unit Piping Length and Elevation How to Mount Installation Plate Drill a Hole In The WallBurrs removal Flaring WorkCut the pipes and the cable Putting nut onConnecting The Piping Indoor unit installationIndoor Wrap the insulation material around the connecting portion Tighten the flare nut with a wrenchInsert the connecting cable into the indoor unit Indoor unit installationPiping for passage through piping hole Correct case Incorrect caseConnection of The Drain Hose Connection of Piping -OutdoorWiring Diagram Connection of The CableHow to use the front panel Front panel opening Front panel closingFront panel removing Checking The Drainage Drain pipingForming The Piping Preparation Air PurgingAir purging With Vacuum Pump Leak testEvacuation Finishing the jobCharging Settlement of outdoor unit Prepare remote controlTest Running Evaluation of the performanceOperation Cooling Mode OperationHealthy Dehumidification Mode Function of ControlsHeating Mode Operation Defrost ControlJet Cool Mode Operation C/O Model Sleep Timer OperationChaos Natural Wind Mode Jet Cool Mode Operation H/P ModelAuto restart Forced operationTest operation Protection of the evaporator pipe from frostingDisplay Function Self-diagnosis FunctionHeating Model Remote Control Operations Operation ModeDisassembly To remove the Grille from the ChassisTo remove the Control Box To remove the Motor Cover Cooling Only Models Troubleshooting GuideRefrigeration Cycle Diagram Cooling & Heating ModelsWay, 3-way Valve Way Valve Liquid SideProcedure Pumping DownBalance Refrigerant of the 3-way Valve Vacuum pump Gas Charging After EvacuationAccording to Indoor & Outdoor Temperature Method of using graphMethod of using equation Additional gas chargingCycle Parts Trouble analysisElectronic Parts Product does not operate at allProduct is not operate with the remote controller Compressor/Outdoor Fan are unable to drive When indoor Fan does not operate NectorWhen Vertical Louver does not operate When a comunication error occurs Phenomena in case of connecting error Indoor UnitOutdoor Unit Schematic Diagram Electric Control DeviceOutdoor 12k Wiring Diagram Models 12kModels 12kC/O Models 12kH/P Components Location Outdoor12k 6871A20259D 6871A00087B6871A00088A 6306A90009AProduct Specifications Cooling OnlyCooling & Heating E.R P.EExploded View Outdoor Unit 12k Btu/h Seriess W0CZZReplacement Parts List Parts List IndoorParts List Outdoor No. MFL31443001

LA121HPMI, LAU121CNM, LAN121CNM, LAN121CNM, LAU121CNM, LA121HPMI, LA121HPMO, LAN121HNM, LAU121HNM, LA121CPMI, LA121CPMO specifications

LG Electronics has established itself as a leader in innovative home appliance technologies, particularly in the air conditioning segment. The LG LAN121CNM, LAU121CNM, LA121HPMI, LA121HPMO, LAN121HNM, LAU121HNM, LA121CPMI, and LA121CPMO models exemplify the blend of efficiency, comfort, and advanced features that LG is known for.

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