LG Electronics General Wall Mounted-Inverter Type manual Troubleshooting CH23, CH28

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	Part 4	Trouble Shooting
	5) Troubleshooting CH23, CH28

	Error	Title	Cause of error	Check point & Normal condition
	code	Title	Cause of error	Check point & Normal condition
	code

	23	DC Link	• DC link volt. is	• Check the power source.
		Low voltage.	140VDC .	• Check the components.

	28	DC Link	• DC link volt. is	• Check the power source.
	28	High voltage	420VDC .	• Check the components.
		High voltage	420VDC .	• Check the components.

Check Point

1. Check the power source.

2. Check the components (B/Diode, Reactor, PSC Parts )

V

60Room Air Conditioner

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Contents SVC MANUALGeneral Contents Safety Precautions Nomenclature Part 1 General InformationSafety Precautions Be sure not to do Be sure to follow the instructionPart 1 General Information Inspections after Repair Nomenclature Global Model NameCode Type Code of Model Meaning Part 2 Functions & Controls Part 2 Functions & Controls Function DescriptionBasic Mode Controls Cooling ModeHeating Mode Intake air Temp Setting Temp Healthy Dehumidification operationAutomatic operation Auto changeover operationSpecial Mode Controls Energy saving operation in cooling modeJet Cool operation Jet Heat operationAuto cleaning operation Indoor temp Operating Mode Setting tempUtility Functions Forced operationAir volume control Natural Air ControlAuto WindChaos Swing Sleep mode Auto control Sleep timer operation for cooling cycleSleep timer operation for heating cycle Auto restartProtection Functions & Controls Five Seconds Stand-by fanTwo Minutes Stand-by comp Hot startAutomatic defrost 1 9,12kBtu/h ModelStarting to the defrosting operation 2 18,24,30kBtu/h ModelDefrosting Control Algorithm Control algorithm of defrost completionPower Relay Control InverterOverheating Protection Power Module Heat sink sensor failure error Heat sink temperature controlFunction Total Current Control Over Current Protection CT1 controlCT2 control Model Cooling Heating KBtu/h 18~30 11A 12A 14A DC Peak control Discharge Pipe Temp ControlInverter Compressor 18,24,30kBtu/h Model Constant Compressor only 30kBtu/h Model There can be two situationsCompressor working Low Ambient control 12.1 9,12kBtu/h Model12.2 18, 24, 30kBtu/h Model Oil return control30kBtu/h Model Oil equalizing control30kBtu/h ModelOperating Contion Operation ProcessCheck before Test Run Test Run Flow chart Test Run Detail Part 3 Test RunCheck before Test Run Test Run Flow chart StartPump Down Procedure Test Run DetailSettlement of outdoor unit Evaluation of the performancePart 4 Trouble Shooting Way, 3-Way Valve Way Valve Liquid SideProcedure Pumping DownAir purging of the charge hose Set the 2-way valve to the closed positionEvacuation All amount of refrigerant leaked Mount the valve stem nuts and the service port nut Gas Charging After EvacuationConnect the charge hose to the charging cylinder Purge the air from the charge hoseCycle Troubleshooting Guide Trouble analysisPart 4 Trouble Shooting Electronic Parts Troubleshooting Guide Procedure Specification RemedyTrouble Compressor/Outdoor Fan dont operate 9~30kBtu/h Model Compressor/Outdoor Fan dont operate 18, 24, 30kBtu/h Model When indoor Fan does not operate.9~30kBtu/h Model Error Indicator Self-diagnosis Function12kBtu/h Model 18,24,30kBtu/h Model Indoor Error Outdoor ErrorError code Descrition Red Green StatusPart Trouble Shooting Troubleshooting Guide9,12kBtu/h Model Description Cause of error Heat-sink Temp. is over Earth port DC Peak Error Description Cause of error Over current Error Description Cause of error Indoor fan is locked Description Cause of error Pipe TH. is short or Troubleshooting CH01, CH02, CH06 Check Point Part 4 Trouble Shooting Troubleshooting CH05, CH53Troubleshooting CH21 CompCopper Comp pipe Troubleshooting CH21, CH22 Troubleshooting CH23, CH28 Troubleshooting CH24, CH25 Troubleshooting CH26, CH27 Troubleshooting CH32, CH33, CH40 Troubleshooting CH41, CH44, CH45, CH46, CH47, CH65 Troubleshooting CH51, CH60 Troubleshooting CH61, CH62 No MFL41161601 August