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LG Electronics LA121HPMI, LAN121CNM, LAN121CNM, LAU121CNM, LA121HPMI, LA121HPMO, LAN121HNM, LAU121HNM, LA121CPMI, LA121CPMO, LAU121CNM Self-diagnosis Function, Display Function

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Service Manual 37

Self-diagnosis Function

Operation

Display Function

1. Heating Model 2. Cooling Model

• Cooling, Soft Dry, Fan, Heating • Cooling, Soft Dry, Fan

• Hot-start, Deice

Operation Indicator

Deicer Indicator

Operation Indicator

Compressor on Indicator

3sec 3sec 3sec

(once)

Error

Code

Error Display LED

(Indoor body operation LED) Error contents

• Indoor room temperature

thermistor open/short

• Indoor pipe temperature

thermistor open/short.

• Indoor Thermistor

assembly check

SVC check point

Contents

Main LG Room Air Conditioner SERVICE MANUAL LG Air Conditioner Service Manual TABLE OF CONTENTS Safety Precautions Installation Operation Page Installation Operation Disuse Dimensions NOTICE Indoor Unit Symbols Used in this Manual 10 Room Air Conditioner Outdoor Unit 1. 12k Introduction Symbols Used In This Manual Features Installation Installation Parts Read carefully, and then follow step by step. Installation Tools Installation Map NOTICE Confirm The Refrigerant Outdoor unit Rooftop Installations Indoor unit Select the Best Location Piping Length and Elevation How to Mount Installation Plate Drill a Hole In The Wall Flaring Work Cut the pipes and the cable. Burrs removal Putting nut on Flaring work Connecting The Piping For left rear piping 20 Room Air Conditioner Wrap the insulation material around the connecting portion. For right rear piping Route the indoor tubing and the drain hose to the required piping hole position. Connecting the pipings to the indoor unit and drain hose to drain pipe. Service Manual 21 Insert the connecting cable into the indoor unit. Tape the drain hose and the connecting cable. Connecting the pipings to the indoor unit and the drain hose to drain pipe. Indoor unit installation Page Page Outdoor unit Connection of The Drain Hose Connection of Piping -Outdoor Connection of The Cable CAUTION Service Manual 27 Checking The Drainage Drain piping The drain hose should point downward for easy drain flow. Downward slope Avoid these situations. Forming The Piping Air Purging Air purging With Vacuum Pump Preparation Leak test Evacuation Finishing the job Service Manual 31 Charging Important: Test Running Test Running 32 Room Air Conditioner Settlement of outdoor unit Prepare remote control Operation DISPLAY Cooling Mode Operation Healthy Dehumidification Mode 34 Room Air Conditioner Operation Heating Mode Operation Defrost Control Page Page Self-diagnosis Function Service Manual 37 Operation Display Function 1. Heating Model 2. Cooling Model Remote Control Operations Operation Mode Service Manual 39 Disassembly Disassembly Indoor Unit Page Service Manual 41 Disassembly 5.To remove the Motor Cover 6.To remove the Cross-Flow Fan Troubleshooting Guide (1) Cooling Only Models (2) Cooling & Heating Models INDOOR UNIT OUTDOOR UNIT Refrigeration Cycle Diagram 2-way, 3-way Valve Pumping Down Balance Refrigerant of the 3-way Valve 46 Room Air Conditioner Troubleshooting Guide Vacuum pump Evacuation Procedure Gas Charging 48 Room Air Conditioner Troubleshooting Guide (According to Indoor & Outdoor Temperature) Additional gas charging Operating Suction Pressure (For R410A) Service Manual 49 Troubleshooting Guide Trouble analysis Cycle Parts 1.Check temperature difference between intake and discharge air and operating current. 50 Room Air Conditioner Troubleshooting Guide Electronic Parts Product does not operate at all. (* Refer to Electronic Control Device drawing and Schematic diagram.) The product is not operate with the remote controller. Compressor/Outdoor Fan are unable to drive. When indoor Fan does not operate. When Vertical Louver does not operate. When a comunication error occurs. 56 Room Air Conditioner Troubleshooting Guide The phenomena in case of connecting error INDOOR UNIT Service Manual 57 Troubleshooting Guide OUTDOOR UNIT Page Page Page Page Page Page DISPLAY ASSEMBLY LCD MODULE Service Manual 65 Product Specifications Product Specifications Cooling Only * Design and specifications subject to change without prior notice for product improvement. 66 Room Air Conditioner Product Specifications Cooling & Heating Service Manual 67 Exploded View Exploded View Indoor Unit 68 Room Air Conditioner Exploded View Outdoor Unit: 12k Btu/h Seriess Service Manual 69 Replacement Parts List Replacement Parts List Parts List (Indoor) 70 Room Air Conditioner Replacement Parts List Parts List (Outdoor)