LG Electronics LS090CP(AS-C0914DH0), LS090HP(AS-H091E1H0), LS120CP(AS-C121E1H0), LS120HP(AS-H121E1H0), LS180CP(AS-C183DM0), LS180HP(AS-H1835DM0), LS240CP(AS-C2435DM0), LS240HP(AS-H2435DM0) Electronic Parts (9k model)

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Copyright ©2007 LG Electronics. Inc. All right reserved.

Only for training and service purposes LGE Internal Use Only

Troubleshooting Guide

Electronic Parts (9k model)

Product does not operate at all.

(* Refer to Electronic Control Device drawing and Schematic diagram.)

Turn off Main Power

Turn on Main Power

Does "beeping" sound is made from the Indoor Unit?

Primarily, the operating condition of Micom is OK.

Check the voltage of power(About AC 115V, 60Hz)

• Main power's voltage

• Voltage applied to the unit

• Connecting method of Indoor/Outdoor connecting

cable

• Check PWB Ass'y(Outdoor unit)

- Fuse

- Pattern damage

- Varistor(ZNR01J)

Check the connection housing for contacting

• Connector related to CN-POWER

• Connector related to CN-FAN

• Connector contacting of Outdoor Fan/Compressor

• Display PWB Ass'y Check

• Connector related to CN-DC/DC

Check each load(Indoor/Outdoor Fan Motor,

Compressor, Stepping Motor) and contacting

condition of related connector(including connecting

cable of Indoor/Outdoor Unit)

PCB Board Operation Check

Items

• Power Transformer

(Outdoor unit)

- Input Voltage

- Output Voltage

• IC01D(7812) Output

(Indoor/Outdoor unit)

• IC02D(7805) Output

(Indoor unit)

IC03D(7805) Output

(Outdoor unit)

• IC01A(KIA7036, Reset IC)

OSC01B(4MHz)

(Indoor/Outdoor unit)

• Replace SMPS

Module

• Replace IC01D

• Replace

IC02D(Indoor unit)

IC03D(Outdoor unit)

• Replace faulty parts

- About AC115V±10% - Check the power voltage

- About DC15V±3

• DC +12V

• DC +5V

• Voltage of Outdoor unit Micom No. 18,

Voltage of Indoor unit Micom No. 43 and

soldering condition

Content Remedy

NO

YES

(After 20 seconds)

Contents

Main LG Room Air Conditioner SVC MANUAL(Exploded View) Air Conditioner Service Manual TABLE OF CONTENTS Safety Precautions Installation Operation Page Installation Operation Disuse Dimensions Symbols Used in this Manual Indoor Unit NOTICE Page Outdoor Unit 1. 9k, 12k 2. 18k, 24k Introduction Symbols Used In This Manual Features Installation Installation Parts Read carefully, and then follow step by step. Installation Tools Installation Map NOTICE THIS PRODUCT CONTAINS R-410A REFRIGERANT 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 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. 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 Wrap the insulation material around the connecting portion. Page Page Finally, tighten the flare nut with torque wrench until the wrench clicks. Outdoor unit Connection Of The Drain Hose Connection Of Piping -Outdoor Connection Of The Cable Page Checking The Drainage Drain piping The drain hose should point downward for easy drain flow. Avoid these situations. Forming The Piping Air Purging Air purging With Vacuum Pump Preparation Leak test Evacuation Finishing the job Charging Important: Test Running Test Running Settlement of outdoor unit Prepare remote control Evaluation of the performance Operation DISPLAY Cooling Mode Operation Healthy Dehumidification Mode Operation Heating Mode Operation Defrost Control Operation Airflow Speed Selection Sleep Timer Operation Chaos Natural Wind Mode Jet Cool Mode Operation (C/O Model) Jet Cool Mode Operation (H/P Model) Page Self-diagnosis Function Operation Display Function 1. Heating Model 2. Cooling Model Remote Control Operations Operation Mode Disassembly Indoor Unit Page 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 Troubleshooting Guide Evacuation Vacuum pump Procedure Gas Charging Troubleshooting Guide Additional gas charging (According to Indoor & Outdoor Temperature) The method of using graph Operating Suction Pressure (For R410A) Troubleshooting Guide Trouble analysis Cycle Parts 1.Check temperature difference between intake and discharge air and operating current. Troubleshooting Guide Electronic Parts (9k model) Product does not operate at all. (* Refer to Electronic Control Device drawing and Schematic diagram.) Troubleshooting Guide Electronic Parts (18k model) 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.(9k Model) Compressor/Outdoor Fan are unable to drive.(18k Model) When indoor Fan does not operate. When Vertical Louver does not operate. When a comunication error occurs. Troubleshooting Guide The phenomena in case of connecting error INDOOR UNIT Troubleshooting Guide OUTDOOR UNIT Page Page Page Page Page Page Components Location Page Page Page Product Specifications Product Specifications Cooling Only * Design and specifications subject to change without prior notice for product improvement. Product Specifications Cooling & Heating Exploded View Indoor Unit Outdoor Unit: 9k, 12k (C/O) Seriess Outdoor Unit: 9k, 12k (H/P) Seriess Outdoor Unit: 18k(C/O) Seriess Outdoor Unit: 24k(C/O) Seriess Outdoor Unit: 18k, 24k (H/P) Seriess