LG Electronics GR-P227/L227, GR-P257/L257 service manual Explain the flow of refrigerant

Page 82

TROUBLE DIAGNOSIS

 

Problems

Checks and Measures

 

 

Sounds of water flowing

■ Explain the flow of refrigerant.

 

 

• When the refrigerator stops, the water flowing sound happens.

 

 

This sound happens when the liquid or vapor refrigerant flows from the

 

 

evaporator to compressor.

 

 

"Click" sounds

■ Explain the characteriistics of moving parts.

 

 

• This noise comes from the MICOM controller's switch on the top of the

 

 

refrigerator when it is turned on and off.

 

 

Noise of ice maker operation

■ Explain the procedure and principles of ice maker operation.

(applicable to model with ice maker).

• Automatic ice maker repeats the cycle of water supplying ➝ icemaking ➝ ice

- Noise produced by ice dropping

ejection. When water is supplied, the water supply valve in the machine room

and hitting ice bank.

makes sounds like “Whizz” and water flowing also makes sound. When water

- Noise from motor sounds “Whizz”.

freezes to ice, freezing sounds such as “click, click” are heard. When ice is

 

 

being ejected, sounds like “Whizz” produced by a motor to rotate an ice tray

 

 

and ice dropping and hitting ice bank sounds are also heard.

 

 

 

Noise when

supplying water.

■ Explain the principles of water supplied to dispenser.

 

 

• When the water supply button in the dispenser is pressed, the water supply

 

 

valve in the compressor compartment opens and let the water flow to the water

 

 

tank in the lower part of the refrigerator compartment. The water is dispensed

 

 

by this pressure. When this happens, motor sound and water flowing sound are

 

 

heard.

 

 

 

Noise when

supplying ice.

■ Explain the principles of ice supply and procedure of crushed ice making in a

 

 

dispenser.

 

 

• When ice cube button is pressed, ice stored in the ice bank is moved by a Helix

 

 

Pusher and dispensed. If crushed ice button is pressed, the cube ice is

 

 

crushed. When this happens, ice crushing and hitting ice bank sounds are

 

 

heard.

 

 

 

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Contents Refrigerator Contents Page Specifications Front ViewRef No. GR-L227 Ref No. GR-P257 Ref No. GR-L257 Parts Identification Freezer Refrigerator compartment compartmentRef No. GR-P227/GR-P257EXTERNAL Filter Parts Identification Parts Identification HOW to Install Refrigerator How to Adjust Door Height of RefrigeratorBefore Installation How to Install Water PipeClass Shape and Spec Nomenclature Two Hands Type Faucet Connection of Pipe Connector a and BSingle Lever Type Faucet general General TypeFilter Cleaning When customer uses bottled waterOutternal Filter Filter Fixation After installing water filter Replacement of water filterHow to Control the Amount of Water Supplied to Icemaker Confirm the amount of water supplied to the icemakerMicom Function Door Alarm Buzzer Mute ModeDisplay Power saving Mode Monitor PanelExhibition Mode Description of FunctionLock function display button lock Outside temperature display functionLCD Back Light Control Filter condition display functionAutomatic ice maker When ice maker does not operate smoothlyDispenser use selection Express FreezerMiracle Zone function Super freezingControl of variable type of freezing room fan Doors of freezing Door opening alarmControl of M/C room fan motor Or home barSequential operation of built-in product Failure Diagnosis Function Mode Operation Contents Remarks Test FunctionTest Mode 1 Status LCD Test Mode 2 Status LCD Function of dispenser and water dispenser built-inExplanation for PWB circuit Power circuitExplation for Micom Circuit GR-P227/L227Oscillation circuit Reset circuitGR-P227/L227/P257/L257 Load/dispenser operation, door opening circuit Load Driving CircuitLever Switch sensing circuit Measuring part Dispenser operation circuitDoor opening sensing circuit Temperature sensing circuit Short OpenOption designation circuit model separation function Switch entry circuitSeparation Connection Status Application Standard 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 Fill/Park Position Harvest ModeIcemaking Mode Water supply amount TableStage Items Indicator Remarks Defect diagnosis functionCircuit Trouble Shooting Trouble DiagnosisNot 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 Remarks FaultsPower Problems Causes Checks MeasuresTemperature Cooling Disconnected from the motor Refer to fan motor disassembly Defrosting failure Problems CausesMeasures Remarks 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 Problems Symptom Causes Checks Measures Remarks MicomDriving circuits Motor damper Replace door switch Trouble Diagnosis Cooling Cycle Heavy Repair Items Unit Standards Purposes RemarksProcess Contents Tools Summary Of Heavy RepairPrecautions During Heavy Repair Items PrecautionsPractical Work For Heavy Repair When replacing a drierWhen replacing a compressor Inserting a capillary tubeCharging sequence Pipe ConnectionVacuum Sequence Calculation of amount of refrigerant chargedStandard Regulations For Heavy Repair 12-0mmAsia / Middle-East Africa Brazing Reference DrawingsEurope & CIS / America Sound depends on the installation location Problems Checks and MeasuresExplain the principles of temperature change Explain general principles of soundsExplain the characteriistics of moving parts Explain the procedure and principles of ice maker operationExplain the flow of refrigerant Explain the principles of water supplied to dispenserMeasures for Symptoms on Temperature Explain the basic principles of food odor Check the temperature control button and set at strongOdor and Frost Explain the basic principles of frost formationOthers HOW to Disassemble and Assemble Remove a freezer doorHandle InsertTubeLineColletClip Assembly COVER, Dispenser Exploded View Ref No. GR-P227/GR-P257 Optional partRef No. GR-L227/GR-L257 Freezer Compartment Refrigerator Compartment Optional partMachine Compartment ICE & Water Part Dispenser Part No JD8999A
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