LG Electronics LA120HPO, LA090HPO, LA120CPO, LA120HPI Compressor/Outdoor Fan are unable to drive

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Troubleshooting Guide

Compressor/Outdoor Fan are unable to drive.

Turn on Main Power

Operate "Cooling Mode( )" by setting the desired temperature of the remote controller is less than one of the indoor temperature by 2°F at least.

When in Fan Mode, Compressor/Outdoor Fan is stopped.

Check the sensor for indoor temperature is attached as close as to be effected by the temperature of Heat Exchanger(EVA).

When the sensor circuit for indoor temperature and connector are in bad connection or are not engaged, Compressor/Outdoor Fan is stopped.

•Check the related circuit of R02H(12.1K), R04H(6.2K), Micom (No.27) (Indoor unit).

• Check the indoor temperature sensor is disconnected or not(About 10kΩ / at 77°F).

When the temperature around Outdoor PWB Ass'y is above 163°F the compressor is stop and only Outdoor Fan is operating.

Check Relay(RY - COMP) for driving compressor.

•When the power(About AC200V) is applied to the connecting wire termi- nal support transferred to compressor, PWB Ass'y is normal.

•Check the circuit related to the relay(Outdoor unit).

	Check point	COMP ON	COMP OFF
	Between Micom(No.	DC5V	DC0V
	5, 6) and GND	DC5V	DC0V
	5, 6) and GND

	Between IC01M, IC02M(No. 9)	Below DC 1V	About DC12V
	and IC01M, IC02M(No. 8)	(app)	About DC12V
	and IC01M, IC02M(No. 8)	(app)

Turn off Main Power

•Check the electrical wiring diagram of outdoor side.

•Check the abnormal condition for the component of Compressor/Outdoor Fan Motor.

Service Manual 65

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Contents Room Air Conditioner Table of Contents Installation Safety PrecautionsDo not use damaged power cords, plugs, or a loose socket Install the panel and the coverOperation Do not install the product on a defective installation standDo not place a heater or other When flammable gas leaks, turnDo not use the product in a tight Sounds, odors, or smoke comesThat water is drained away prop Keep level even when installingDo not use the product for spe Product when removingCial 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 9k, 12k Models Outdoor UnitModels Product SpecificationsInstallation Tools InstallationInstallation Parts Installation Map This Product Contains R-410A Refrigerant Confirm The RefrigerantSelect the best Location Rooftop InstallationsIndoor unit Outdoor unitPiping Length and Elevation Oil trap should be installed every 16.4~23feets 5~7 metersOpen panel front Preparing Work for InstallationCover pipe and cover side remove Drain hose junctionCase of nothing wrong, connect Pipe and the wire. Refer to installationFixing Indoor Unit Flaring Work Flaring work and connection of pipingCheck Connecting the PipingIndoor Foamed polyethylene or equivalent is recommendedIndoor unit tubing Flare nut Pipings Wrap the insulation material around the connecting portionBad case For right piping. Follow the instruction below Good caseConnection of Piping -Outdoor Connecting the Cables How to connect wiring to the terminals Connection method of the connecting cableExampleConnecting 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 Test Running Prepare remote controllerSettlement of outdoor unit Evaluation of the performancePump Down Pump Down ProcedureHow to replace picture & photograph Functions OperationChaos Swing Mode Time delay Safety ControlCooling Operation Mode Function of main controlAuto Operation for Cooling Auto Operation Electronic control modeAuto Operation for Heatingonly Heating Model Healthy DehumidificationAuto Operation for Dehumidificationonly Heating Model Hot-Start Control Heating Operation Modeonly Heating ModelHeating Mode with the Sleep Modeonly Heating Model Cooling or Heating Mode with Sleep Mode Auto ControlCooling Mode with the Sleep Mode Forced Operation Auto restartCooling Heat pump Model Test operationDisplay Function Signal ReceptorSelf-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 Heat Pump/Cooling Only SeriesIndoor Unit Schematic DiagramHeat Pump Series/ Cooling Only Series Outdoor Unit No A20999A PCB ASSEMBLY, Main Top View Bottom View Indoor Unit P.W.B. AssemblyNo A20901C PCB ASSEMBLY, Main Top View Bottom View Outdoor Unit P.W.B. AssemblyDisplay P.W.B. ASM No A20921A PCB AssemblyWiring Diagram Outdoor UnitCooling Only Models, & Heating Models Refrigeration Cycle Diagram Troubleshooting GuidePiping Length and Elevation Way Valve ProcedurePumping Down Air purging of the charge hoseRe-air purging Gas 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 hoseMethod of using equation Method of using graphAccording to Indoor & Outdoor Temperature Additional gas chargingTrouble analysis Cycle PartsProduct does not operate at all Electronic Parts 9k modelProduct is not operate with the remote controller Compressor/Outdoor Fan are unable to drive Nector When indoor Fan does not operateWhen Vertical Louver does not operate When a comunication error occurs Indoor Unit Phenomena in case of connecting errorOutdoor Unit RY-COMP-B Voltage of Connectors according to Indoor Fan SpeedIndoor Unit Exploded ViewOutdoor Unit Parts ListIndoor Replacement Parts ListParts ListOutdoor December No A20926C