LG Electronics AS-W096URH0/UBH0/UWH0/UMH0 Problem of missing the connector Indoor Main PCB Assy

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Troubleshooting Guide

■The problem of missing the connector (INDOOR MAIN PCB ASSY)

	Connectors	Condition	Problem (error mode)

		OPEN	• Malfunctions all indoor & outdoor unit.
	CN-AC/DC	OPEN	• Malfunctions remocon, force, test operation mode.
	CN-AC/DC		• Malfunctions remocon, force, test operation mode.

	CN-FAN	OPEN	• Malfunctions indoor fan motor.

			• Malfunctions outdoor unit.
	CN-T/Block	OPEN	• Stop compressor and outdoor fan motor.
	CN-T/Block	OPEN	• The operation LED blinks 5 times.
			• The operation LED blinks 5 times.
			• Communication error.

	CN-DISP1	OPEN	• Malfunctions remote contoller.
	CN-DISP1	OPEN	• Don't operate the power display module.
			• Don't operate the power display module.

	CN-DISP2	OPEN	• Don't operate the power display module.

	CN-TH	OPEN/SHORT	• The operation LED blinks twice.
	CN-TH	OPEN/SHORT	• Enable to receive remote singnal.
			• Enable to receive remote singnal.

	CN-U/D	OPEN	• Malfunctions UP/DOWN step motor.
	CN-U/D	OPEN	• Don't operate louver.
			• Don't operate louver.

■The problem of missing the connector (OUTDOOR MAIN PCB ASSY)

	Connectors	Condition	Problem (error mode)

	CN-4 WAY	OPEN	• Malfunctions 4-WAY valve.

	CN-FAN	OPEN	• Malfunctions fan

	CN-TH	OPEN/SHORT	• The operation LED blinks twice.
	CN-TH	OPEN/SHORT	• The LED01M blinks twice.
			• The LED01M blinks twice.

			• The LED01M blinks 10 times.
	CN-D-PIPE	OPEN/SHORT	• Continue Comp. operation.
	CN-D-PIPE	OPEN/SHORT	(when the discharge pipe TH opens)
			• Stop Comp. operation
			(when the discharge pipe TH shorts)

	CN-UVW	OPEN	• Stop compressor.

Service Manual 79

Image 79

Contents LG Room Air Conditioner Table of Contents 2002 LG Model NameCode 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 9k, 12k Btu Series DimensionsSymbols Used in this Manual Indoor UnitOutdoor Unit AS-W096U0 AS-W126U0 AS-W096U1 AS-W126U1 Product SpecificationsOutdoor unit InstallationSelect the best Location Indoor unitOil trap should be installed every 5~7 meters Fixing Installation PlatePiping Length and Elevation Flaring Work Drill a Hole in the WallFoamed polyethylene or equivalent is recom- mended Connecting the PipingCheck IndoorWrap 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 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 Evaluation of the performance Prepare remote controllerTest Running Settlement of outdoor unitPump Down Pump Down ProcedureFunctions Stand by control at low temp Power relay controlActive power filter controlPSC Overheatng. ProtectionPower moduleCooling Down to 18C Heating Down to 16C Up to 30C Cancel Sleep Mode, Timer on or Timer OFF3, 4, 5, 6 Off Timer High39C Low11CLED display of indoor unit OperationLG 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 operationOperating freq. step of comp Heating mode operationTemp. differences Comp. Operating frequency At beginning Fuzzy mode operationOptionalsIntake air temp Setting temp Fan speed Fuzzy operation for coolingFuzzy operation for dehumidification Fuzzy operation for HeatingChaos swing mode Jet cool mode operationJet heat mode operation Swing modeSleep timer operation for cooling cycle Sleep timer operationSleep timer operation for heating cycle Trial Operation Indoor temp Operating Mode Setting tempAuto restarting operation Forced operationProtection from DC Peak Current Protection from total current controlPortection from overheating of compressor Portection from overheating of power moduleAS-W096/126U0 Series Defrosting controlAS-W096/126U1 Series Auto ChangeoverOptional Auto CleaningLow Ambient To remove the Grille from the Chassis DisassemblyTo remove the Discharge Grille To remove the Control BoxTo remove the Evaporator To remove the Cross-Flow Fan To remove the Motor CoverElectric Control Device Schematic DiagramIndoorAS-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 Model Adopted Electrion Expansion Valve Troubleshooting GuideRefrigeration Cycle Diagram Model Capillary TubePipe Length and the Elevation Oil trap should be installed per 5~7 metersOutdoor unit Indoor unit Way Valve Liquid Side Way, 3-way ValvePurge the air from the system ProcedureAir purging Check for gas leakageAir purging of the charge hose Pumping DownSet the 2-way valve to the closed position Air purging Re-installationMount the valve stem nuts and the service port nut Re-air PurgingGas leakage Balance Refrigerant of the 3-way ValveAll amount of refrigerant leaked EvacuationPurge the air from the charge hose Gas ChargingAfter Evacuation Connect the charge hose to the charging cylinderTrouble 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 normallyCN-T/Block Problem of missing the connector Indoor Main PCB AssyProblem of missing the connector Outdoor Main PCB Assy Connectors Condition Problem error modeIndoor Unit Exploded ViewOutdoor Unit Description Replacement Parts ListPanel ASSY, Front SUB No A20061Z October