LG Electronics AS-W126URH1/UBH1/UWH1/UMH1 Precaution in Service or Check, Diagnosis Procedure

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Troubleshooting Guide

■Precaution in Service or Check

Even after stopping the operation of product, it takes some time to discharge the remaining electricity of the electrolytic capacitor that was charged. Before starting a checking or repairing job, pull out the plug out of the outlet and make sure that the lamp on the control board outdoor unit is off.

■The Diagnosis Procedure

Check the supplied voltage to product (AC 220V/230V ± 30V).

Check the connecting cable between Indoor and Outdoor.

Check the blinking number of operation indicator

(refer to the self-diagnosis function).

Check the self-diagnosis table

Indoor

•Check the condition of connectors

•The condition of P.C.B pattern.

Outdoor

•Check the condition of connectors.

•The condition of P.C.B pattern.

•The electronic components.

68Room Air Conditioner

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Contents LG Room Air Conditioner Table of Contents Code Type Code of Model Meaning LG Model Name2002 2003~2005 MeaningSafety Precautions InstallationThere is risk of fire, electric shock, explosion, or injury Operation ThinnerKeep level even when installing the product Be cautious that water could not enter the productOperation Dimensions Symbols Used in this ManualIndoor Unit 9k, 12k Btu SeriesOutdoor Unit Product Specifications AS-W096U0 AS-W126U0 AS-W096U1 AS-W126U1Installation Select the best LocationIndoor unit Outdoor unitPiping Length and Elevation Fixing Installation PlateOil trap should be installed every 5~7 meters Drill a Hole in the Wall Flaring WorkConnecting the Piping CheckIndoor Foamed polyethylene or equivalent is recom- mendedWrap the insulation material around the connecting portion For left rear piping Indoor unit installation For left piping. Follow the instruction below Good case Bad caseOutdoor Outdoor unitConnecting the Cables Circuit Grade Breaker 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 Prepare remote controller Test RunningSettlement of outdoor unit Evaluation of the performancePump Down Procedure Pump DownFunctions Power relay control Active power filter controlPSCOverheatng. ProtectionPower module Stand by control at low tempCancel Sleep Mode, Timer on or Timer OFF 3, 4, 5, 6 Off TimerHigh39C Low11C Cooling Down to 18C Heating Down to 16C Up to 30CLG Brand/OEM Brand OperationLED display of indoor unit Protection of the evaporator pipe from frosting Control methodCooling mode operation Model Comp. Operating frequencyHealthy Dehumidification mode operation Intake air Temp Setting TempTemp. differences Comp. Operating frequency Heating mode operationOperating freq. step of comp Fuzzy mode operationOptionals Intake air temp Setting temp Fan speedFuzzy operation for cooling At beginningFuzzy operation for Heating Fuzzy operation for dehumidificationJet cool mode operation Jet heat mode operationSwing mode Chaos swing modeSleep timer operation for heating cycle Sleep timer operationSleep timer operation for cooling cycle Indoor temp Operating Mode Setting temp Auto restarting operationForced operation Trial OperationProtection from total current control Protection from DC Peak CurrentPortection from overheating of power module Portection from overheating of compressorAS-W096/126U1 Series Defrosting controlAS-W096/126U0 Series Low Ambient Auto CleaningAuto ChangeoverOptional Disassembly To remove the Grille from the ChassisTo remove the Evaporator To remove the Control BoxTo remove the Discharge Grille To remove the Motor Cover To remove the Cross-Flow FanIndoorAS-W096U 0, AS-W126U 0 Series Schematic DiagramElectric Control Device OutdoorAS-W096Series, AS-W126Series Wiring Diagram Indoor Unit AS-W096/126U0,1 SeriesOutdoor Unit AS-W096U0 Series AS-W126U0 SeriesIndoor Main P.W.B Assembly DC Part Components LocationDisplay ASSEMBLYAS-W096/126U0,1 Series Outdoor Main P.W.B Assembly AS-W096/126U0 Series Troubleshooting Guide Refrigeration Cycle DiagramModel Capillary Tube Model Adopted Electrion Expansion ValveOutdoor unit Indoor unit Oil trap should be installed per 5~7 metersPipe Length and the Elevation Way, 3-way Valve Way Valve Liquid SideProcedure Air purgingCheck for gas leakage Purge the air from the systemSet the 2-way valve to the closed position Pumping DownAir purging of the charge hose Re-installation Mount the valve stem nuts and the service port nutRe-air Purging Air purgingBalance 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 hoseCycle Parts Trouble analysisSelf-diagnosis function Precaution in Service or Check Diagnosis ProcedureProcedure Specification Remedy Electronic PartsProduct doesnt operate with the remote controller Compressor/Outdoor Fan are unable to drive Check Point Comp. on Comp. OFFWhen indoor Fan does not operate Trouble 5 When the horizontal louver does not operate Heater does not operate at all Outdoor Unit does not operate at all Indoor OutdoorTrouble 8-1When compressor does not operate normally DC Peak ErrorError Code ➅Trouble 8-2When compressor does not oprate normally Communication error between Indoor and Outdoor Error Code ➄Trouble 8-3When compressor does not oprate normally CT Error Error Code ➆Problem of missing the connector Indoor Main PCB Assy Problem of missing the connector Outdoor Main PCB AssyConnectors Condition Problem error mode CN-T/BlockExploded View Indoor UnitOutdoor Unit Replacement Parts List DescriptionPanel ASSY, Front SUB No A20061Z October