LG Electronics LA120HPI, LA120HPO, LA090HPO, LA120CPO, LA120CPI When a comunication error occurs

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Troubleshooting Guide

When a comunication error occurs.

•The operation indicator of Indoor unit blinks five times.

•The red indicator of Outdoor unit blinks five times.

Check the connecting wires between Indoor and Outdoor unit for the connecting error and the contacting condition.

Check the installation condition of outdoor unit.

Check for the communication error and the operating condition of product after also operating with the remote controller, then taking above 2 minutes.

Apply the power again after about 20 seconds by the power of Outdoor unit is off.

Check for the communication error and the operating condition of product after also operating with the remote controller, then taking above 2 minutes.

Check the PWB assembly of Indoor and Outdoor unit.

Caution: If the connecting wires of Indoor and Outdoor unit are not connected within 2 minutes after the power of Outdoor unit is applied, a communication error will occur. Therefore, the power should be applied after connecting them.

68Room Air Conditioner

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Contents Room Air Conditioner Table of Contents Safety Precautions InstallationDo not use damaged power cords, plugs, or a loose socket Install the panel and the coverDo not install the product on a defective installation stand OperationWhen flammable gas leaks, turn Do not place a heater or otherDo not use the product in a tight Sounds, odors, or smoke comesKeep level even when installing That water is drained away propProduct when removing Do not use the product for speCial purposes, such as preserv Ing foods, works of art, etc. It is aIt is not sanitary and could cause DisuseOutlet while the air conditioner is Indoor Unit DimensionsSymbols Used in this Manual Outdoor Unit 9k, 12k ModelsProduct Specifications ModelsInstallation Tools InstallationInstallation Parts Installation Map Confirm The Refrigerant This Product Contains R-410A RefrigerantRooftop Installations Select the best LocationIndoor unit Outdoor unitOil trap should be installed every 16.4~23feets 5~7 meters Piping Length and ElevationPreparing Work for Installation Open panel frontCover pipe and cover side remove Drain hose junctionCase of nothing wrong, connect Pipe and the wire. Refer to installationFixing Indoor Unit Flaring work and connection of piping Flaring WorkConnecting the Piping CheckIndoor Foamed polyethylene or equivalent is recommendedWrap the insulation material around the connecting portion Indoor unit tubing Flare nut PipingsFor right piping. Follow the instruction below Good case Bad caseConnection of Piping -Outdoor Connecting the Cables Connection method of the connecting cableExample How to connect wiring to the terminalsConnecting the cable between indoor unit and outdoor unit Drain piping Checking the DrainageTo check the drainage Forming the Piping Air purging with vacuum pump Air PurgingAir purging Finishing the job Soap water methodEvacuation Charging Panel Front Assembly Prepare remote controller Test RunningSettlement of outdoor unit Evaluation of the performancePump Down Procedure Pump DownHow to replace picture & photograph Operation FunctionsTime delay Safety Control Chaos Swing ModeCooling Operation Mode Function of main controlAuto Operation Electronic control mode Auto Operation for CoolingAuto Operation for Heatingonly Heating Model Healthy DehumidificationAuto Operation for Dehumidificationonly Heating Model Heating Operation Modeonly Heating Model Hot-Start ControlHeating Mode with the Sleep Modeonly Heating Model Cooling or Heating Mode with Sleep Mode Auto ControlCooling Mode with the Sleep Mode Auto restart Forced OperationCooling Heat pump Model Test operationSignal Receptor Display FunctionSelf-diagnosis Function Operation Indication LampsNd F Button Remote Control OperationsControls To remove the Control Box DisassemblyTo remove the Grille from the Chassis To remove the Motor To remove the Evaporator. Remove hole tubing holdeBefore removing the Turbo Fan Schematic Diagram Heat Pump/Cooling Only SeriesIndoor UnitHeat Pump Series/ Cooling Only Series Outdoor Unit Indoor Unit P.W.B. Assembly No A20999A PCB ASSEMBLY, Main Top View Bottom ViewOutdoor Unit P.W.B. Assembly No A20901C PCB ASSEMBLY, Main Top View Bottom ViewNo A20921A PCB Assembly Display P.W.B. ASMWiring Diagram Outdoor UnitCooling Only Models, & Heating Models Troubleshooting Guide Refrigeration Cycle DiagramPiping Length and Elevation Procedure Way ValvePumping Down Air purging of the charge hoseRe-air purging Balance refrigerant of the 3-way valve Gas leakageEvacuation All amount of refrigerant leakedGas Charging After EvacuationConnect the charge hose to the charging cylinder Purge the air from the charge hoseMethod of using graph Method of using equationAccording to Indoor & Outdoor Temperature Additional gas chargingCycle Parts Trouble analysisElectronic Parts 9k model 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 Voltage of Connectors according to Indoor Fan Speed RY-COMP-BExploded View Indoor UnitOutdoor Unit Replacement Parts List Parts ListIndoorParts ListOutdoor December No A20926C