Display Function, Self-diagnosis Function | LG Electronics LA120HPI

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

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

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 socket Operation Do not install the product on a defective installation stand Sounds, odors, or smoke comes When flammable gas leaks, turnDo not place a heater or other Do not use the product in a tight That water is drained away prop Keep level even when installing Ing foods, works of art, etc. It is a Product when removingDo not use the product for spe Cial purposes, such as preserv Outlet while the air conditioner is DisuseIt is not sanitary and could cause Symbols Used in this Manual DimensionsIndoor Unit 9k, 12k Models Outdoor Unit Models Product Specifications Installation Parts InstallationInstallation Tools Installation Map This Product Contains R-410A Refrigerant Confirm The Refrigerant Outdoor unit Rooftop InstallationsSelect the best Location Indoor unit Piping Length and Elevation Oil trap should be installed every 16.4~23feets 5~7 meters Drain hose junction Preparing Work for InstallationOpen panel front Cover pipe and cover side remove Fixing Indoor Unit Pipe and the wire. Refer to installationCase of nothing wrong, connect Flaring Work Flaring work and connection of piping Foamed polyethylene or equivalent is recommended Connecting the PipingCheck Indoor Indoor unit tubing Flare nut Pipings Wrap the insulation material around the connecting portion Bad case For right piping. Follow the instruction below Good case Connection of Piping -Outdoor Connecting the Cables How to connect wiring to the terminals Connection method of the connecting cableExample Connecting 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 unit Pump Down Pump Down Procedure How to replace picture & photograph Functions Operation Function of main control Time delay Safety ControlChaos Swing Mode Cooling Operation Mode Auto Operation for Cooling Auto Operation Electronic control mode Auto Operation for Dehumidificationonly Heating Model Healthy DehumidificationAuto Operation for Heatingonly Heating Model Hot-Start Control Heating Operation Modeonly Heating Model Cooling 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 Model Operation Indication Lamps Signal ReceptorDisplay Function Self-diagnosis Function Controls 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 Diagram Heat Pump Series/ Cooling Only Series Outdoor Unit No A20999A PCB ASSEMBLY, Main Top View Bottom View Indoor Unit P.W.B. Assembly No A20901C PCB ASSEMBLY, Main Top View Bottom View Outdoor Unit P.W.B. Assembly Display P.W.B. ASM No A20921A PCB Assembly Wiring Diagram Outdoor UnitCooling Only Models, & Heating Models Refrigeration Cycle Diagram Troubleshooting Guide Piping Length and Elevation Air purging of the charge hose ProcedureWay Valve Pumping Down Re-air purging Gas leakage Balance refrigerant of the 3-way valve All amount of refrigerant leaked Evacuation Purge the air from the charge hose Gas ChargingAfter Evacuation Connect the charge hose to the charging cylinder Additional gas charging Method of using graphMethod of using equation According to Indoor & Outdoor Temperature Trouble analysis Cycle Parts Product does not operate at all Electronic Parts 9k model Product is not operate with the remote controller Compressor/Outdoor Fan are unable to drive Nector When indoor Fan does not operate When Vertical Louver does not operate When a comunication error occurs Indoor Unit Phenomena in case of connecting error Outdoor Unit RY-COMP-B Voltage of Connectors according to Indoor Fan Speed Indoor Unit Exploded View Outdoor Unit Parts ListIndoor Replacement Parts List Parts ListOutdoor December No A20926C