LG Electronics AS-W126URH0/UBH0/UWH0/UMH0/UCH0 Electronic Parts, Procedure Specification Remedy

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Troubleshooting Guide

ElectronicParts

❇Refer to electronic contorol device drawing & schematic diagram.

Trouble 1

The Product doesn’t operate at all.

Turn off the main power and wait to 10 seconds

Turn on the main power again.

Does "Beeping" sound is made from the indoor unit?

NO

Check the voltage of power(AC220V/AC240V, 50Hz).

•The voltage of main power.

•The voltage applied to the unit.

•The connecting method of Indoor/Outdoor connecting cable (each color)

•The P.C.B. Ass'y

(Fuse, Noise Filter, Power Module, Bridge Diode, etc.)

YES

•Primarily, the operating condi- tion of Micom is O.K.

•Check CN-DISP1

CN-DISP2 of indoor DC PCB

The operation check of the Indoor P.C.B. Ass'y

		Procedure		Specification		Remedy

1)		The input voltage of power mod-	1)	AC230V ± 30V	1)	Check the power outlet.
		ule.		: Check the rated voltage
2)		The output voltage of power mod-	2)	12V ± 3V	2)	Replace
		ule.				P.C.B Ass'y
4)		IC02D(7805)	4) DC5V		4) Replace P.C.B Ass'y
5)		IC01A(KIA7036)	5)	The voltage of micom pin 19	5)	Replace P.C.B Ass'y
				: DC4.5V↑

Service Manual 69

Image 69

Contents LG Room Air Conditioner Table of Contents LG Model Name 2002Code Type Code of Model Meaning Meaning 2003~2005Installation Safety PrecautionsThere is risk of fire, electric shock, explosion, or injury Thinner OperationBe cautious that water could not enter the product Keep level even when installing the productOperation Symbols Used in this Manual DimensionsIndoor Unit 9k, 12k Btu SeriesOutdoor Unit AS-W096U0 AS-W126U0 AS-W096U1 AS-W126U1 Product SpecificationsSelect the best Location InstallationIndoor unit Outdoor unitFixing Installation Plate Oil trap should be installed every 5~7 metersPiping Length and Elevation Flaring Work Drill a Hole in the WallCheck Connecting the PipingIndoor Foamed polyethylene or equivalent is recom- mendedWrap the insulation material around the connecting portion For left rear piping Indoor unit installation Bad case For left piping. Follow the instruction below Good caseOutdoor unit OutdoorConnecting the Cables Circuit Grade Breaker Checking the Drainage To check the drainageDrain piping Forming the Piping Air Purging Air purgingAir purging with vacuum pump Soap water method EvacuationFinishing the job Test Running Prepare remote controllerSettlement of outdoor unit Evaluation of the performancePump Down Pump Down ProcedureFunctions Active power filter controlPSC Power relay controlOverheatng. ProtectionPower module Stand by control at low temp3, 4, 5, 6 Off Timer Cancel Sleep Mode, Timer on or Timer OFFHigh39C Low11C Cooling Down to 18C Heating Down to 16C Up to 30COperation LED display of indoor unitLG Brand/OEM Brand Control method Protection of the evaporator pipe from frostingModel Comp. Operating frequency Cooling mode operationIntake air Temp Setting Temp Healthy Dehumidification mode operationHeating mode operation Operating freq. step of compTemp. differences Comp. Operating frequency Intake air temp Setting temp Fan speed Fuzzy mode operationOptionalsFuzzy operation for cooling At beginningFuzzy operation for dehumidification Fuzzy operation for HeatingJet heat mode operation Jet cool mode operationSwing mode Chaos swing modeSleep timer operation Sleep timer operation for cooling cycleSleep timer operation for heating cycle Auto restarting operation Indoor temp Operating Mode Setting tempForced operation Trial OperationProtection from DC Peak Current Protection from total current controlPortection from overheating of compressor Portection from overheating of power moduleDefrosting control AS-W096/126U0 SeriesAS-W096/126U1 Series Auto Cleaning Auto ChangeoverOptionalLow Ambient To remove the Grille from the Chassis DisassemblyTo remove the Control Box To remove the Discharge GrilleTo remove the Evaporator To remove the Cross-Flow Fan To remove the Motor CoverSchematic Diagram Electric Control DeviceIndoorAS-W096U 0, AS-W126U 0 Series OutdoorAS-W096Series, AS-W126Series Indoor Unit AS-W096/126U0,1 Series Wiring DiagramAS-W126U0 Series Outdoor Unit AS-W096U0 SeriesComponents Location Indoor Main P.W.B Assembly DC PartDisplay ASSEMBLYAS-W096/126U0,1 Series Outdoor Main P.W.B Assembly AS-W096/126U0 Series Refrigeration Cycle Diagram Troubleshooting GuideModel Capillary Tube Model Adopted Electrion Expansion ValveOil trap should be installed per 5~7 meters Pipe Length and the ElevationOutdoor unit Indoor unit Way Valve Liquid Side Way, 3-way ValveAir purging ProcedureCheck for gas leakage Purge the air from the systemPumping Down Air purging of the charge hoseSet the 2-way valve to the closed position Mount the valve stem nuts and the service port nut Re-installationRe-air Purging Air purgingGas leakage Balance Refrigerant of the 3-way ValveAll amount of refrigerant leaked EvacuationAfter Evacuation Gas ChargingConnect the charge hose to the charging cylinder Purge the air from the charge hose Trouble analysis Cycle PartsSelf-diagnosis function Diagnosis Procedure Precaution in Service or CheckElectronic Parts Procedure Specification RemedyProduct doesnt operate with the remote controller Check Point Comp. on Comp. OFF Compressor/Outdoor Fan are unable to driveWhen indoor Fan does not operate Trouble 5 When the horizontal louver does not operate Heater does not operate at all Indoor Outdoor Outdoor Unit does not operate at allDC Peak ErrorError Code ➅ Trouble 8-1When compressor does not operate normallyCommunication error between Indoor and Outdoor Error Code ➄ Trouble 8-2When compressor does not oprate normallyCT Error Error Code ➆ Trouble 8-3When compressor does not oprate normallyProblem of missing the connector Outdoor Main PCB Assy Problem of missing the connector Indoor Main PCB AssyConnectors Condition Problem error mode CN-T/BlockIndoor Unit Exploded ViewOutdoor Unit Description Replacement Parts ListPanel ASSY, Front SUB No A20061Z October