Manuals / LG Electronics / Household Appliance / Air Conditioner

LG Electronics AS-W126URH0/UBH0/UWH0/UMH0/UCH0, AS-W126URH1/UBH1/UWH1/UMH1 service manual

Models: AS-W096URH1/UBH1/UWH1/UMH1 AS-W126URH1/UBH1/UWH1/UMH1 AS-W096URH0/UBH0/UWH0/UMH0 AS-W126URH0/UBH0/UWH0/UMH0/UCH0

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Page 77

Troubleshooting Guide

Trouble 8-2When compressor does not oprate normally.

■Communication error between Indoor and Outdoor (Error Code ➄)

Does the operating LED in display PCB Ass'y blink 5 times?

YES

Is the voltage of BR/BK, RD AC220/240V in Main PCB Ass'y.

YES

Is the connection of CN-T/Block and in CN-AC/DC indoor P.C.B Ass'y is right?

YES

Replace the PCB Ass'y.

•Main PCB Ass'y (Indoor/Outdoor)

•Control Box Ass'y.

NO

NO

NO

•Check the state of connecting cable (3 line) bewteen indoor and outdoor unit .

•Check Fuse, Noise Filter, PTC, etc.

•Electrical wiring diagram(Colors)

•Check the connecting state

of connectors in outdoor PCB Ass'y

•Check the Fuse of outdoor PCB Ass'y.

•Reconnect the connectors.

•Check the PCB pattern(Resoldering).

Service Manual 77

Image 77

LG Electronics AS-W126URH0/UBH0/UWH0/UMH0/UCH0 service manual Trouble 8-2When compressor does not oprate normally

Contents

LG Room Air Conditioner Table of Contents Code Type Code of Model Meaning LG Model Name2002 Meaning 2003~2005 Installation Safety Precautions There is risk of fire, electric shock, explosion, or injury Thinner Operation Be cautious that water could not enter the product Keep level even when installing the product Operation Symbols Used in this Manual DimensionsIndoor Unit 9k, 12k Btu Series Outdoor Unit AS-W096U0 AS-W126U0 AS-W096U1 AS-W126U1 Product Specifications Select the best Location InstallationIndoor unit Outdoor unit Piping Length and Elevation Fixing Installation PlateOil trap should be installed every 5~7 meters Flaring Work Drill a Hole in the Wall Check Connecting the PipingIndoor Foamed polyethylene or equivalent is recom- mended Wrap the insulation material around the connecting portion For left rear piping Indoor unit installation Bad case For left piping. Follow the instruction below Good case Outdoor unit Outdoor Connecting the Cables Circuit Grade Breaker 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 Test Running Prepare remote controllerSettlement of outdoor unit Evaluation of the performance Pump Down Pump Down Procedure Functions Active power filter controlPSC Power relay controlOverheatng. ProtectionPower module Stand by control at low temp 3, 4, 5, 6 Off Timer Cancel Sleep Mode, Timer on or Timer OFFHigh39C Low11C Cooling Down to 18C Heating Down to 16C Up to 30C LG Brand/OEM Brand OperationLED display of indoor unit Control method Protection of the evaporator pipe from frosting Model Comp. Operating frequency Cooling mode operation Intake air Temp Setting Temp Healthy Dehumidification mode operation Temp. differences Comp. Operating frequency Heating mode operationOperating freq. step of comp Intake air temp Setting temp Fan speed Fuzzy mode operationOptionalsFuzzy operation for cooling At beginning Fuzzy operation for dehumidification Fuzzy operation for Heating Jet heat mode operation Jet cool mode operationSwing mode Chaos swing mode Sleep timer operation for heating cycle Sleep timer operationSleep timer operation for cooling cycle Auto restarting operation Indoor temp Operating Mode Setting tempForced operation Trial Operation Protection from DC Peak Current Protection from total current control Portection from overheating of compressor Portection from overheating of power module AS-W096/126U1 Series Defrosting controlAS-W096/126U0 Series Low Ambient Auto CleaningAuto ChangeoverOptional To remove the Grille from the Chassis Disassembly To remove the Evaporator To remove the Control BoxTo remove the Discharge Grille To remove the Cross-Flow Fan To remove the Motor Cover IndoorAS-W096U 0, AS-W126U 0 Series Schematic DiagramElectric Control Device OutdoorAS-W096Series, AS-W126Series Indoor Unit AS-W096/126U0,1 Series Wiring Diagram AS-W126U0 Series Outdoor Unit AS-W096U0 Series Components Location Indoor Main P.W.B Assembly DC Part Display ASSEMBLYAS-W096/126U0,1 Series Outdoor Main P.W.B Assembly AS-W096/126U0 Series Refrigeration Cycle Diagram Troubleshooting GuideModel Capillary Tube Model Adopted Electrion Expansion Valve Outdoor unit Indoor unit Oil trap should be installed per 5~7 metersPipe Length and the Elevation Way Valve Liquid Side Way, 3-way Valve Air purging ProcedureCheck for gas leakage Purge the air from the system Set the 2-way valve to the closed position Pumping DownAir purging of the charge hose Mount the valve stem nuts and the service port nut Re-installationRe-air Purging Air purging Gas leakage Balance Refrigerant of the 3-way Valve All amount of refrigerant leaked Evacuation After Evacuation Gas ChargingConnect the charge hose to the charging cylinder Purge the air from the charge hose Trouble analysis Cycle Parts Self-diagnosis function Diagnosis Procedure Precaution in Service or Check Electronic Parts Procedure Specification Remedy Product doesnt operate with the remote controller Check Point Comp. on Comp. OFF Compressor/Outdoor Fan are unable to drive When indoor Fan does not operate Trouble 5 When the horizontal louver does not operate Heater does not operate at all Indoor Outdoor Outdoor Unit does not operate at all DC Peak ErrorError Code ➅ Trouble 8-1When compressor does not operate normally Communication error between Indoor and Outdoor Error Code ➄ Trouble 8-2When compressor does not oprate normally CT Error Error Code ➆ Trouble 8-3When compressor does not oprate normally Problem of missing the connector Outdoor Main PCB Assy Problem of missing the connector Indoor Main PCB AssyConnectors Condition Problem error mode CN-T/Block Indoor Unit Exploded View Outdoor Unit Description Replacement Parts List Panel ASSY, Front SUB No A20061Z October