LG Electronics GR-P257/L257, GR-P227/L227 service manual Measures for Symptoms on Temperature

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TROUBLE DIAGNOSIS

4-2. Measures for Symptoms on Temperature

Problems	Checks and Measures

Refrigeration is weak.	■ Check temperature set in the temperature control knob.
	• Refrigerator is generally delivered with the button set at “normal use” (MID).
	But customer can adjust the temperature set depending on their habit and taste.
	If you feel the refrigeration is weak, then set the temperature control button at
	“strong” position. If you adjust the button in the freezer compartment as well,
	the refrigeration is stronger than adjusting refrigerator only.

The food in the chilled drawer is .	■ The chilled drawer does not freeze food.
not frozen but defrosted	• Use chilled drawer for storing fresh meat or fish for short periods. For storing for
	a long periods or freezing food, use a freezer compartment. It is normal that
	frozen foods thaw above the freezing temperature (in the chilled drawer).

Refrigerator water is not cool.	■ Check the water storage location.
	• If water is kept in the door rack, please ask to keep it in the refrigerator
	compartment shelf. It will then become cooler.

Ice cream softens.	■ Explain the characteristics of ice cream.
	• The freezing point of ice cream is below -15°C. Therefore ice cream may melt if
	it is stored in the door rack.
	• Store ice cream in a cold place or set the temperature control button of a freezer
	at “strong” position.

Refrigeration is too strong.	■ Check the position of temperature control button.
	• Check if refrigeration is strong in whole area of the refrigerator or partly near the
	outlet of the cooling air. If it is strong in whole area, set the control button at
	“weak”. If it is strong only near the outlet of cool air, keep food (particularly wet
	and easy to frozen such as bean curd and vegetables) away from the outlet.

Vegetables are frozen.	■ Check the vegetables storage.
	• If vegetables are stored in the refrigerator shelf or chilled drawer instead of
	vegetable drawer, they will be frozen. Set the control button at “weak” if they are
	also frozen in the vegetable drawer.

The food stored at inside of	■ Check if food is stored near the outlet of the cooling air.
the shelf freezes even the	• The temperature at cooling air outlet is always below the freezing point.
control button is set at “MID”.	Do not store food near the outlet of the cooling air as it block the air circulation.
	And do not block the outlet. If the outlet of the cooling air is blocked, the
	refrigerator compartment will not be cooled.

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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