LG Electronics GR-P257/L257, GR-P227/L227 service manual Cooling

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2-4. Cooling

Problems	Causes		Checks	Measures	Remarks

High	Refrigerant leak.	Check sequence		Weld the leaking part, recharge the	Drier must be replaced.
temperature		1.	Check the welded parts of the	refrigerant.
in the freezer			drier inlet and outlet and drier
compartment.			auxiliary in the compressor
			compartment (high pressure side).
		2.	Check the end of compressor
			sealing pipe (low pressure side).
		3.	Check silver soldered parts.
			(Cu + Fe / Fe + Fe).
		4.	Check bending area of wire
			condenser pipe in compressor
			compartment (cracks can
			happen during bending).
		5.	Check other parts (compressor
			compartment and evaporators in
			freezer compartment).

	Shortage of refrigerant.	Check frost formation on the surface		- Find out the leaking area, repair,	Drier must be replaced.
		of evaporator in the freezer		evacuate, and recharge the
		compartment.		refrigerant.
		- If the frost forms evenly on the		- No leaking, remove the remaining
		surface, it is OK.		refrigerant, and recharge new
		- If it does not, it is not good.		refrigerant.

TROUBLE DIAGNOSIS

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Contents Refrigerator Contents Page Front View SpecificationsRef No. GR-L227 Ref No. GR-P257 Ref No. GR-L257 Freezer Refrigerator compartment compartment Parts IdentificationRef No. GR-P227/GR-P257EXTERNAL Filter Parts Identification Parts Identification How to Adjust Door Height of Refrigerator HOW to Install RefrigeratorClass Shape and Spec Nomenclature How to Install Water PipeBefore Installation General Type Connection of Pipe Connector a and BSingle Lever Type Faucet general Two Hands Type FaucetOutternal Filter Filter Fixation When customer uses bottled waterFilter Cleaning Replacement of water filter After installing water filterConfirm the amount of water supplied to the icemaker How to Control the Amount of Water Supplied to IcemakerMonitor Panel Door Alarm Buzzer Mute ModeDisplay Power saving Mode Micom FunctionDescription of Function Exhibition ModeFilter condition display function Outside temperature display functionLCD Back Light Control Lock function display button lockExpress Freezer When ice maker does not operate smoothlyDispenser use selection Automatic ice makerControl of variable type of freezing room fan Super freezingMiracle Zone function Or home bar Door opening alarmControl of M/C room fan motor Doors of freezingSequential operation of built-in product Failure Diagnosis Function Test Function Mode Operation Contents RemarksFunction of dispenser and water dispenser built-in Test Mode 1 Status LCD Test Mode 2 Status LCDGR-P227/L227 Power circuitExplation for Micom Circuit Explanation for PWB circuitGR-P227/L227/P257/L257 Reset circuitOscillation circuit Load Driving Circuit Load/dispenser operation, door opening circuitDispenser operation circuit Lever Switch sensing circuit Measuring partDoor opening sensing circuit Short Open Temperature sensing circuitSeparation Connection Status Application Standard Switch entry circuitOption designation circuit model separation function Stepping motor operation circuit Fan motor driving circuit freezer, mechanical area +5 C +9F 33 k Ω 56 k Ω JCR1 Main PCB Sensor resistance characteristics table Miracle Zone Stepping Motor / Display Operation Principle Water supply amount Table Harvest ModeIcemaking Mode Fill/Park PositionDefect diagnosis function Stage Items Indicator RemarksCircuit Trouble Diagnosis Trouble ShootingNot performed Evaporator by heating as Refrigeration Refrigeration Residual Refrigeration No cooling air circulation Is weak Fan does not work Recess Sounds Compressor compartment operating sounds Bad soldering Bad rivet contact Short Structure Door foam Appearance Sag Problems Causes Checks Measures FaultsPower Problems Causes Checks Measures RemarksTemperature Cooling Disconnected from the motor Refer to fan motor disassembly Measures Remarks Problems CausesDefrosting failure Remove the parts and replace it Icing Discharging port of cooling air Sound Click Contraction of evaporator Sources Sound Burping It happens when refrigerant expands Odor Micom Problems Symptom Causes Checks Measures RemarksDriving circuits Motor damper Replace door switch Trouble Diagnosis Items Unit Standards Purposes Remarks Cooling Cycle Heavy RepairSummary Of Heavy Repair Process Contents ToolsItems Precautions Precautions During Heavy RepairInserting a capillary tube When replacing a drierWhen replacing a compressor Practical Work For Heavy RepairCalculation of amount of refrigerant charged Pipe ConnectionVacuum Sequence Charging sequence12-0mm Standard Regulations For Heavy RepairEurope & CIS / America Brazing Reference DrawingsAsia / Middle-East Africa Explain general principles of sounds Problems Checks and MeasuresExplain the principles of temperature change Sound depends on the installation locationExplain the principles of water supplied to dispenser Explain the procedure and principles of ice maker operationExplain the flow of refrigerant Explain the characteriistics of moving partsMeasures for Symptoms on Temperature Explain the basic principles of frost formation Check the temperature control button and set at strongOdor and Frost Explain the basic principles of food odorOthers Remove a freezer door HOW to Disassemble and AssembleHandle InsertTubeLineColletClip Assembly COVER, Dispenser Exploded View Optional part Ref No. GR-P227/GR-P257Ref No. GR-L227/GR-L257 Freezer Compartment Optional part Refrigerator CompartmentMachine Compartment ICE & Water Part Dispenser Part No JD8999A