LG Electronics AS-W126URH1/UBH1/UWH1/UMH1 Trouble 8-1When compressor does not operate normally

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Troubleshooting Guide

Trouble 8-1When compressor does not operate normally.

■DC Peak Error(Error Code ➅)

NO

Does the LED01M of outdoor PCB Ass'y blink 6 times?

YES

NO

Is the connecting state of connectors in out- door. PCB Ass'y right?

(CN-UVW)

YES

NO

Is the power module in PCB Ass'y right?

YES

NO

Is the voltage of T/Block , over than

AC150V?

YES

NO

Is the voltage of GND-IPM(32 pin) over than about DC280V?

YES

NO

Is the refrigerant pressure right?

NO

Replace the PCB Ass'y.

•Main PCB Ass'y

•Control Box Ass'y

Check the state of connecting cable (3 line) between indoor and outdoor uint.

•Electrical wiring diagram (Colors)

•Check the connecting state of connectors in PCB Ass'y

•If CN-UWV is connected, the comprressor can be operated a opposite direction.

•Check the short P-N P-U, V, W, and N-U, V, W of IPM and then collector, emiter of

IGBT

Check the supplied voltage.

•Check the DC voltage between IPM 1pin

GND

Supply the refrigerant or Discharge refriger- ant.

76Room Air Conditioner

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Contents LG Room Air Conditioner Table of Contents 2002 LG Model NameCode Type Code of Model Meaning 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 unitOil trap should be installed every 5~7 meters Fixing Installation PlatePiping Length and Elevation 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 To check the drainage Checking the DrainageDrain piping Forming the Piping Air purging Air PurgingAir purging with vacuum pump Evacuation Soap water methodFinishing the job 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 30CLED display of indoor unit OperationLG Brand/OEM Brand Protection of the evaporator pipe from frosting Control methodCooling mode operation Model Comp. Operating frequencyHealthy Dehumidification mode operation Intake air Temp Setting TempOperating freq. step of comp Heating mode operationTemp. differences Comp. Operating frequency 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 cooling cycle Sleep timer operationSleep timer operation for heating 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-W096/126U0 Series Defrosting controlAS-W096/126U1 Series Auto ChangeoverOptional Auto CleaningLow Ambient Disassembly To remove the Grille from the ChassisTo remove the Discharge Grille To remove the Control BoxTo remove the Evaporator To remove the Motor Cover To remove the Cross-Flow FanElectric Control Device Schematic DiagramIndoorAS-W096U 0, AS-W126U 0 Series 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 ValvePipe Length and the Elevation Oil trap should be installed per 5~7 metersOutdoor unit Indoor unit Way, 3-way Valve Way Valve Liquid SideProcedure Air purgingCheck for gas leakage Purge the air from the systemAir purging of the charge hose Pumping DownSet the 2-way valve to the closed position 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