LG Electronics LA120HPI, LA120HPO Display Function, Self-diagnosis Function, Signal Receptor

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Operation

Display Function

Signal Receptor

Receives the signals from the remote control.(Signal receiving sound: two short beeps or one long beep.)

Operation Indication Lamps

On/Off

: Lights up during the system operation.

Self-diagnosis Function

Error

Error LED

Error contents

SVC check point

Code

(Indoor body operation LED)

• Indoor room temperature

1

(once)

thermistor open/short

• Indoor TH assy check

• Indoor pipe temperature

3sec

3sec

3sec

thermistor open/short.

2

(twice)

• Outdoor pipe temperature

• Outdoor TH assy check

thermistor open/short.

3sec

3sec

5

(5times)

• Poor communication.

• Communication line/circuit

check

3sec

Service Manual 43

Image 43

Contents Room Air Conditioner Table of Contents Install the panel and the cover Safety PrecautionsInstallation Do not use damaged power cords, plugs, or a loose socketOperation Do not install the product on a defective installation standSounds, odors, or smoke comes When flammable gas leaks, turnDo not place a heater or other Do not use the product in a tightThat water is drained away prop Keep level even when installingIng foods, works of art, etc. It is a Product when removingDo not use the product for spe Cial purposes, such as preservOutlet while the air conditioner is DisuseIt is not sanitary and could cause Symbols Used in this Manual DimensionsIndoor Unit 9k, 12k Models Outdoor UnitModels Product SpecificationsInstallation Parts InstallationInstallation Tools Installation Map This Product Contains R-410A Refrigerant Confirm The RefrigerantOutdoor unit Rooftop InstallationsSelect the best Location Indoor unitPiping Length and Elevation Oil trap should be installed every 16.4~23feets 5~7 metersDrain hose junction Preparing Work for InstallationOpen panel front Cover pipe and cover side removeFixing Indoor Unit Pipe and the wire. Refer to installationCase of nothing wrong, connect Flaring Work Flaring work and connection of pipingFoamed polyethylene or equivalent is recommended Connecting the PipingCheck IndoorIndoor 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 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 Charging Panel Front Assembly Evaluation of the performance Prepare remote controllerTest Running Settlement of outdoor unitPump Down Pump Down ProcedureHow to replace picture & photograph Functions OperationFunction of main control Time delay Safety ControlChaos Swing Mode Cooling Operation ModeAuto Operation for Cooling Auto Operation Electronic control modeAuto Operation for Dehumidificationonly Heating Model Healthy DehumidificationAuto Operation for Heatingonly Heating Model Hot-Start Control Heating Operation Modeonly Heating ModelCooling Mode with the Sleep Mode Cooling or Heating Mode with Sleep Mode Auto ControlHeating Mode with the Sleep Modeonly Heating Model Test operation Auto restartForced Operation Cooling Heat pump ModelOperation Indication Lamps Signal ReceptorDisplay Function Self-diagnosis FunctionControls Remote Control OperationsNd F Button To remove the Grille from the Chassis DisassemblyTo remove the Control Box Before removing the Turbo Fan To remove the Evaporator. Remove hole tubing holdeTo remove the Motor 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 Air purging of the charge hose ProcedureWay Valve Pumping DownRe-air purging Gas 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 cylinderAdditional gas charging Method of using graphMethod of using equation According to Indoor & Outdoor TemperatureTrouble 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