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LG GR-P227 Service Manual
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LG GR-P227 Service Manual

Lg refrigerator service manual
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REFRIGERATOR
SERVICE MANUAL
CAUTION
PLEASE READ CAREFULLY THE SAFETY PRECAUTIONS OF THIS BOOK
BEFORE CHECKING OR OPERATING THE REFRIGERATOR.
MODEL: GR-P227/L227
COLOR: TITANIUM
GR-P257/L257

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Summary of Contents for LG GR-P227

  • Page 1 REFRIGERATOR SERVICE MANUAL CAUTION PLEASE READ CAREFULLY THE SAFETY PRECAUTIONS OF THIS BOOK BEFORE CHECKING OR OPERATING THE REFRIGERATOR. MODEL: GR-P227/L227 COLOR: TITANIUM GR-P257/L257...

  • Page 2: Table Of Contents

    CONTENTS WARNINGS AND PRECAUTIONS FOR SAFETY ........................ 3 SPECIFICATIONS................................... 4 PARTS IDENTIFICATION ............................... 6 HOW TO INSTALL THE REFRIGERATOR .......................... 10 HOW TO ADJUST DOOR HEIGHT OF THE REFRIGERATOR ..................10 HOW TO INSTALL WATER PIPE ............................11 HOW TO CONTROL THE AMOUNT OF WATER SUPPLIED TO THE ICEMAKER ............15 MICOM FUNCTION ................................

  • Page 3: Warnings And Precautions For Safety

    WARNINGS AND PRECAUTIONS FOR SAFETY Please observe the following safety precautions in order to 8. Do not fray, damage, machine, heavily bend, pull out, use safely and correctly the refrigerator and to prevent or twist the power cord. accident and danger during repair. 9.

  • Page 4: Specifications

    SPECIFICATIONS 1. Ref No. : GR-P227 ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS DIMENSIONS (mm) 894(W) 790(D) 1753(H) FIRST DEFROST 4 - 5 Hours NET WEIGHT (kg) DEFROST CYCLE 13 - 15 Hours COOLING SYSTEM Fan Cooling DEFROSTING DEVICE Heater, Sheath TEMPERATURE CONTROL...
  • Page 5 SPECIFICATIONS 2. Ref No. : GR-L227 ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS DIMENSIONS (mm) 894(W) 790(D) 1753(H) DRIER MOLECULAR SIEVE XH-7 NET WEIGHT (kg) FIRST DEFROST 4 - 5 Hours COOLING SYSTEM Fan Cooling DEFROST CYCLE 13 - 15 Hours TEMPERATURE CONTROL Micom Control DEFROSTING DEVICE Heater, Sheath...

  • Page 6: Specifications

    SPECIFICATIONS 1. Ref No. : GR-P257 ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS 875(D) DIMENSIONS (mm) 894(W) 1753(H) FIRST DEFROST 4 - 5 Hours NET WEIGHT (kg) DEFROST CYCLE 13 - 15 Hours COOLING SYSTEM Fan Cooling DEFROSTING DEVICE Heater, Sheath TEMPERATURE CONTROL Micom Control ANTI SWEAT HEATER Dispenser Duct Door Heater...
  • Page 7 SPECIFICATIONS 2. Ref No. : GR-L257 ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS 875(D) DIMENSIONS (mm) 894(W) 1753(H) DRIER MOLECULAR SIEVE XH-7 NET WEIGHT (kg) FIRST DEFROST 4 - 5 Hours COOLING SYSTEM Fan Cooling DEFROST CYCLE 13 - 15 Hours TEMPERATURE CONTROL Micom Control DEFROSTING DEVICE Heater, Sheath...

  • Page 8: Parts Identification

    PARTS IDENTIFICATION 1. Ref No. : GR-P227/GR-P257 (INTERNAL FILTER) Cover PWB Frame Display Water Tube Dispenser Lamp Ice & Water Dispenser Button Home Bar Freezer Refrigerator compartment compartment Milk product corner Lamp Automatic Icemaker Shelf Door Rack Shelf Lamp Can Server (Optional)
  • Page 9 PARTS IDENTIFICATION 2. Ref No. : GR-P227/GR-P257 (EXTERNAL FILTER) Cover PWB Frame Display Dispenser Lamp Ice & Water Dispenser Button Home Bar Freezer Refrigerator compartment compartment Milk product corner Lamp Automatic Icemaker Shelf Door Rack Shelf Lamp Can Server (Optional)
  • Page 10 PARTS IDENTIFICATION 3. Ref No. : GR-P227/GR-P257 (INTERNAL FILTER) Cover PWB Frame Display Water Tube Dispenser Lamp Ice & Water Dispenser Button Freezer Refrigerator compartment compartment Milk product corner Lamp Automatic Icemaker Shelf Door Rack Shelf Lamp Can Server (Optional)
  • Page 11 PARTS IDENTIFICATION 4. Ref No. : GR-P227/GR-P257 (EXTERNAL FILTER) Cover PWB Frame Display Dispenser Lamp Ice & Water Dispenser Button Freezer Refrigerator compartment compartment Milk product corner Lamp Automatic Icemaker Shelf Door Rack Shelf Lamp Can Server (Optional) Wine holder...

  • Page 12: How To Install Refrigerator

    HOW TO INSTALL REFRIGERATOR 1. How to Adjust Door Height of Refrigerator I Make the refrigerator level first. (If the refrigerator is not installed on the flat floor, the height of freezer and refrigerator door may not be the same.) 1.

  • Page 13: How To Install Water Pipe

    HOW TO INSTALL REFRIGERATOR 2. How to Install Water Pipe 2-1. When connecting directly to the water tap. I Please confirm the following installation parts. I Before Installation 1. The icemaker requires the water pressure of 1.5 - 8.5kgf/cm . (It is acceptable if city water fills a cup of 180cc with water for 3 seconds) 2.
  • Page 14 HOW TO INSTALL REFRIGERATOR 1. Connection of Pipe Connector A and B. Caution : • Feed pipe should be connected to cold water line. If it is connected to hot water line, trouble 1) Turn off main valve of water pipe. may occur.
  • Page 15 HOW TO INSTALL REFRIGERATOR 3. When customer uses bottled water. *If customer wants to use bottled water, extra pump should be installed as shown below. 1. The pump system should not be on the floor (it may cause noise and vibration). Securely fasten the inlet and outlet nuts of pump.
  • Page 16 HOW TO INSTALL REFRIGERATOR I Install Water Filter (Applicable to some models only) I Before Installing water filter Control box 1. Before installing the filter, take out the top shelf of the refrigerator after tilting it to the direction ( ) and lifting it to the direction ( ) and move it to the lower part.
  • Page 17 HOW TO INSTALL REFRIGERATOR 3. How to Control the Amount of Water Supplied to Icemaker. 3-1. Confirm the amount of water supplied to the icemaker. Water Amount Indicator Light Feeler Arm Power Water Amount Switch Selection Button 1) The automatic icemaker can automatically make 6 cubes at a time, 70~120 pieces per day. This quantity may vary by circumstance, including ambient temperature, door opening, freezer load.

  • Page 18: Micom Function

    MICOM FUNCTION 1. Monitor Panel 1-1. GR-P227/GR-P257 Expres Freezer Door Alarm Button/ Selection Button Lock Button Dispenser Dispenser Light On/Off Button/ Selection Button Filter Status Display RESET Button Temperature Adjust Button Temperature Adjust Button For Freezer Compartment For Refrigerator Compartment 1-2.
  • Page 19 MICOM FUNCTION Once the mode activates, the display is always OFF. Until door is opened or display button is pressed. When 20 seconds has elapsed after closing door or pressing button, the display turns OFF. To deactivate this mode is same as the activation methods.
  • Page 20 MICOM FUNCTION 2-1-2. LCD Back Light Control 1. In order to easily view display status on the LCD, LCD Back Light is turned on for a minute in application of initial power, for a minute in button manipulation and for a minute after closing time from opening time of door. 2.
  • Page 21 MICOM FUNCTION 2-2. Dispenser use selection You can select water or ice. DISPENSER ❉ Please select water, slice ice and square ice by pressing button as you desire. ❉ Please press the push button lightly by catching and pushing in cup. •...
  • Page 22 MICOM FUNCTION 2-7. Super freezing 1. EXPRESS FRZ freezing is a function to increase the cooling speed of the freezer compartment by running both the compressor and the fan simultaneously. 2.EXPRESS FRZ is cancelled and the refrigerator returns to its default setting in the event of a power interruption. 3.
  • Page 23 MICOM FUNCTION 2-10. Control of M/C room fan motor 1. The M/C room fan motor performs ON/OFF control by linking with the COMP. 2. It controls at the single RPM without varying RPM. 3. Failure sensing method is same as in fan motor of freezing fan motor (refer to failure diagnosis function table for failure display).
  • Page 24 MICOM FUNCTION 2-15. Sequential operation of built-in product Built-in products such as compressor, frost removal heater, freezing room fan, Cooling Fan and step motor damper are sequentially operated as follows for preventing noise and part damage occurred due to simultaneous operation of a lot of parts in applying initial power and completing test.
  • Page 25 MICOM FUNCTION 2-16. Failure Diagnosis Function 1. Failure diagnosis function is function to facilitate service when nonconforming matters affecting performance of product during use of product. 2. In occurrence of failure, pressing the function adjustment button does not perform function. 3.
  • Page 26 MICOM FUNCTION 2-17. Test Function 1. The purpose of test function is to check function of the PWB and product and to search for the failure part at the failure status. 2. Test button is placed on the main PCB of refrigerator (test switch), and the test mode will be finished after maximum 2 hours irrespective of test mode and then is reset to the normal status.
  • Page 27 MICOM FUNCTION ✻ LCD check function: If simultaneously pressing super freezer button and freezing temperature adjustment button for a second, a back light is turned on and all display LCD graphics on. If releasing the button, the LCD graphic displays the previous status, the back light is turned off (LCD graphic and back light ON/OFF check).

  • Page 28: Explation For Micom Circuit

    Caution : Since high voltage (310 Vdc) is maintained at the power terminal, wait at least 3 minutes after unplugging the appliance to check the voltages to allow the current to dissipate. Voltage of every part is as follows: Part Voltage 230 Vac 310 Vdc 16 Vdc 12 Vdc 16 Vdc 5 Vdc (1) GR-P227/L227 - 26 -...
  • Page 29 MICOM (IC1). The oscillator (OSC1) must always be replaced with an exact replacement part. If this specification is changed, the change will affect the time calculations of the MICOM and it might not work at all. (1) GR-P227/L227/P257/L257 1-3. Reset circuit The RESET circuit allows various parts of the MICOM, such as RAM, defrosting, etc., to be restarted from the initial state...
  • Page 30 ✽ In the TEST mode, the fan will stop if any door is opened. It will resume operation when the door is closed. Defrost AC Converting Refrigerator Dispenser Type of Load Compressor Heater Relay LAMP Heater Measuring part (IC6) IC6-16 IC6-13 IC6-12 IC6-15 IC6-14 Within 1 V Status 12 V (1) GR-P227/L227/P257/L257 - 28 -...
  • Page 31 EXPLATION FOR MICOM CIRCUIT 1-5. Dispenser operation circuit (1) GR-P227/L227/P257/L257 1) Check load driving status WATER VALVE PILOT GEARED SOLENOID SOLENOID Type of Load MOTOR CUBE DISPENSER VALVE WATER Measuring part IC7-15 IC7-14 IC7-13 IC7-12 IC7-11 Within 1 V Status...
  • Page 32 EXPLATION FOR MICOM CIRCUIT 1-6. Door opening sensing circuit (1) GR-P227/L227/P257/L257 Measuring part IC1 (MICOM) No. (44, 45) / (45, 46) / (47, 48) Pin Door of Freezer and Refrigerator Closing 5 V ( A - B , C - D . Switch at both ends are at Off status) Opening 0 V ( A - B , C - D .
  • Page 33 EXPLATION FOR MICOM CIRCUIT 1-7. Temperature sensing circuit (1) GR-P227/L227/P257/L257 The circuits involving the freezer and refrigerator sensors control the temperature in both the freezer and the refrigerator. The icemaker sensor detects when ice is made. The defrost sensor determines both the need for defrosting and the efficiency of the defrost operation.
  • Page 34 EXPLATION FOR MICOM CIRCUIT 1-8. Switch entry circuit The following circuits are sensing signal form the damper motor reed switch for testing and diagnosing the refrigerator. (1) GR-P227/L227/P257/L257 1-9. Option designation circuit (model separation function) (1) GR-P227/L227/P257/L257 The circuits shown above vary according to which features are included on your particular model.
  • Page 35 EXPLATION FOR MICOM CIRCUIT 1-10. Stepping motor operation circuit (1) GR-P227/L227/P257/L257 The motor is driven by magnetism formed in the areas of the coils and the stator. Rotation begins when a HIGH signal is applied to MICOM Pin 33 of IC10 (TA7774F). This causes an output of HIGH and LOW signals on MICOM pins 34 and 35.
  • Page 36 3. This circuit stops the fan motor by cutting off power to the fan when it senses a lock-up condition. a , d part b part e part Motor OFF 2V or less 2V or less Motor ON 2 ~ 3V 12 ~ 14V 8 ~ 16V (1) GR-P227/L227/P257/L257 - 34 -...
  • Page 37 EXPLATION FOR MICOM CIRCUIT 1-12. Temperature compensation and temperature compensation circuit 1. Temperature compensation in freezer and refrigerator (1) GR-P227/L227/P257/L257 Temperature compensation at refrigerator Temperature compensation at freezer Freezer Refrigerator Resistance value Temperature Resistance value Temperature Remarks (RCF1) compensation (RCR1) compensation 180 kΩ...
  • Page 38 EXPLATION FOR MICOM CIRCUIT u Temperature compensation table at the refrigerator is as follows: Modification resistance 470 Ω 2 kΩ 3.3 kΩ 5.6 kΩ 8.2 kΩ 10 kΩ 12 kΩ 18 kΩ 33 kΩ 56 kΩ 180 kΩ Current resistance 0.5 °C 1 °C 1.5 °C...
  • Page 39 EXPLATION FOR MICOM CIRCUIT 2. Compensation circuit for temperature at freezer (1) GR-P227/L227/P257/L257 Temperature compensation in CUT JCR1 +1 °C [+1.8 °F] +2 °C [+3.6 °F] JCR2 +1 °C [+1.8 °F] JCR3 -1 °C [-1.8 °F] -2 °C [-3.6 °F] JCR4 -1 °C [-1.8 °F]...
  • Page 40 MICOM of main PCB and LCD (LED) dedicated MICOM for LCD (LED) control of display PCB. Main PCB L/Wire FD/H(4-wires) Display PCB DC 12V Main MICOM LCD(LED) dedicated MICOM Transmission (error status) Reception (notch status) (1) GR-P227/L227/P257/L257 - 38 -...
  • Page 41 EXPLATION FOR MICOM CIRCUIT 2) Sensor resistance characteristics table Refrigerator sensor 1&2 Measuring Temperature (°C) Freezing Sensor Defrost sensor, Ambient sensor -20 °C 22.3 kΩ 77 kΩ -15 °C 16.9 kΩ 60 kΩ -15 °C 13.0 kΩ 47.3 kΩ -5 °C 10.1 kΩ...
  • Page 42 EXPLATION FOR MICOM CIRCUIT 1-14. Miracle Zone STEPPING MOTOR / Display Miracle zone stepping motor damper is same as 1-8 stepping motor operation circuit and the miracle zone display turns on only when the R-door opens. - 40 -...

  • Page 43: Operation Principle

    ICEMAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR 1. Operation Principle 1-1. Operation Principle of Icemaker Power On Start Position Start Position Icemaking Mode Harvest Mode Fill Ice Making Mode Park Position Water Test Mode amount selection button Harvest Fill Icemaking 1.

  • Page 44: Icemaker Functions

    ICEMAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR 2. ICEMAKER FUNCTIONS 2-1. Start Position 1. After POWER OFF or power outage, check the EJECTOR's position with MICOM initialization to restart. 2. How to check if it is in place: - Check HIGH/LOW signals from HALL SENSOR in MICOM PIN. 3.

  • Page 45: Defect Diagnosis Function

    ICEMAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR 2-5. Function TEST 1. This is a forced operation for TEST, Service, cleaning, etc. It is operated by pressing and holding the Water amount selection button for 3 seconds. 2. The test works only in the Icemaking Mode. It cannot be entered from the Harvest or Fill mode. (If there is an ERROR, it can only be checked in the TEST mode.) 3.

  • Page 46: Circuit

    CIRCUIT (1) GR-P227/L227/P257/L257GR-P227/L227/P257/L257 - 44 -...

  • Page 47: Trouble Diagnosis

    TROUBLE DIAGNOSIS 1. Trouble Shooting CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK * Measuring instrument : 1) No power on outlet. 1. Faulty start Multi tester 2) No power on cord. I Check the voltage. Bad connection between adapter and outlet. (faulty adapter) The Inner diameter of adapter.
  • Page 48 TROUBLE DIAGNOSIS CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK I Check the clogged 2. No cooling. 2) Refrigeration system is clogged. evaporator by heating (as Moisture Residual moisture Air Blowing. Not performed. soon as the cracking sound clogged. in the evaporator. Too short.
  • Page 49 TROUBLE DIAGNOSIS CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 3. Refrigeration 1) Refrigerant Partly leaked. Weld joint leak. is weak. Parts leak. 2) Poor defrosting capacity. I Check visually. Drain path (pipe) clogged. Inject P/U into drain hose. Inject through the hole.
  • Page 50 TROUBLE DIAGNOSIS CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 3. Refrigeration Residual Weak heat from heater. Sheath Heater - rated. is weak. frost. Heater plate - rated. Too short defrosting time. Defrost Sensor. - Faulty characteristics. Seat-D(missing, location. thickness). Structural fault.
  • Page 51 TROUBLE DIAGNOSIS CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 3. Refrigeration 4) No cooling air circulation. is weak. Faulty fan motor. Fan is Fan shroud contact. - Clearance. constrained. Damping evaporator contact. Accumulated residual frost. Small cooling air Insufficient Fan overload.
  • Page 52 TROUBLE DIAGNOSIS CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 4. Warm 1) Colgged cooling path. refrigerator P/U liquid leak. compartment Foreign materials. –– P/U dump liquid. temperature. 2) Food storate. Store hot food. Store too much at once. Door open. Packages block air flow.
  • Page 53 TROUBLE DIAGNOSIS CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 6. Dew and 4) Dew on door. ice formation. Dew on the duct door. - Duct door heater is cut. Dew on the dispense Recess Heater is cut. recess. Duct door is open. / Foreign material clogging. Dew on the door surface.
  • Page 54 TROUBLE DIAGNOSIS CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 7. Sounds 1) Compressor compartment operating sounds. Transformer sound. Its own fault. –– Core gap. Bad connection. –– Correct screw connection. Drip tray vibration sound. Bad assembly. Distortion. Foreign materials inside. Back cover machine sound.
  • Page 55 TROUBLE DIAGNOSIS CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 8. Faulty lamp 1) Lamp problem. Filament blows out. (freezer and Glass is broken. refrigerator 2) Bad lamp assembly. Not inserted. compartment). Loosened by vibration. 3) Bad lamp socket. Disconnection. Bad soldering.
  • Page 56 TROUBLE DIAGNOSIS CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 10. Structure, 1) Door foam. appearance Sag. Weak torque of Bolt is loosened during and others. hinge connection. transportaion. Not tightly fastened. Screw worn out . Weak gasket Adhesion surface. adhesion.

  • Page 57: Faults

    2. Faults 2-1. Power Problems Causes Checks Measures Remarks No power on - Power cord cut. - Check the voltage with tester. -Replace the components. outlet. - Faulty connector insertion. - Check visually. -Reconnect the connecting parts. - Faulty connection between plug - Check visually.
  • Page 58 2-3. Temperature Problems Causes Checks Measures Remarks High Poor cool air circulation due to faulty - Lock –– Check resistance with a - Replace fan motor. temperature fan motor. tester. in the freezer 0Ω: short. ∞Ω: cut. compartment. - Reconnect and reinsert. - Rotate rotor manually and check rotation.
  • Page 59 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.
  • Page 60 Problems Causes Checks Measures Remarks High Cycle pipe is clogged. Check sequence. - Heat up compressor discharging Direr must be replaced. temperature in 1. Check temperature of condenser weld joints with touch, disconnect the freezer manually. the pipes, and check the clogging. compartment.
  • Page 61 2-5. Defrosting failure Problems Causes Checks Measures Remarks No defrosting. Heater does not generate heat as 1. Check the resistance of heater. Heating wire is short and wire is cut. Seal the lead wire with 0Ω: Short. ∞Ω: Cut. the heating wire is cut or the circuit •...
  • Page 62 Problems Causes Checks Measures Remarks No defrosting Melting fuse blows out. - Check melting fuse with tester. - Faullty parts: parts replacement. 1) Lead wire is cut. If 0Ω: OK. - Check wire color when maeasuring If ∞Ω: wire is cut. 2) Bad soldering.
  • Page 63 2-6. Icing Problems Causes Checks Measures Remarks Icing in the 1) Bad circulation of cool air. - Check the food is stored properly - Be acquainted with how to use. - Check the defrost refrigerator - Clogged intake port in the (check discharge and intake port - Sealing on connecting parts.
  • Page 64 Problems Causes Checks Measures Remarks Ice in the freezer 1) Bad cooling air circulation. - Check food storage conditions - Be acquainted with how to use. - Check the parts related compartment. - Intake port is colgged in the freezer visually.(Check clogging at intake - Check defrost (Check ice on the to defrosting if the...
  • Page 65 2-7. Sound Problems Causes Checks Measures Remarks "Whizz" sound 1. Loud sound of compressor 1.1 Check the level of the 1) Maintain horizontal level. operation. refrigerator. 2) Replace rubber and seat if they 1.2 Check the rubber seat are sagged and aged. conditions (sagging and aging).
  • Page 66 Problems Causes Checks Measures Remarks Vibration sound. 1. Vibration of shelves and foods in 1-1. Remove and replace the 1) Reassemble the vibrating parts ("Cluck") the refrigerator. shelves in the refrigerator and insert foam or cushion where 2. Pipes interference and capillary 1-2.
  • Page 67 Problems Causes Checks Measures Remarks Sound "Burping" It happens when refrigerant expands - Check the sound of refrigerant at the - Check the restrainer attached on the (almost the same at the end of capillary tube. initial installation. evaporator and capillary tube weld as animals crying - Check the sound when the refrigerator joints and attach another restrainer.
  • Page 68 2-8. Odor Problems Causes Checks Measures Remarks Food Odor. Food (garlic, kimchi, etc) - Check the food is not wrapped. - Dry deodorizer in the shiny and - Check the shelves or inner windy place. wall are stained with food juice. - Store the food in the closed - Check the food in the vinyl wraps.
  • Page 69 2-9. Micom Problems Symptom Causes Checks Measures Remarks Bad PCB All display Bad connection Bad connector Visual check on connector Reconnect electric power. LCD are off. between Main PCB connection from main connection. connector. and display circuit. PCB to display PCB. Defective PCB trans.
  • Page 70 Problems Symptom Causes Checks Measures Remarks Bad cooling. Freezer Compressor does Compressor Lead Wire Check compressor Lead Wire Reconnect Lead temperature is not start. is cut. with a tester. Wire. high. Defective compressor Measure voltage at PCB CON2 Replace relay(RY1 Refer to load driving relay.
  • Page 71 Problems Symptom Causes Checks Measures Remarks Bad cooling Wrong Defective Step Motor Check Step Motor Check if Step Motor damper Reconnect lead Refrigerator Damper. damper motor and motor and reed switch lead wire. temperature. reed switch and lead wire are cut with a tester. wire are cut.
  • Page 72 Problems Symptom Causes Checks Measures Remarks Bad defrost. Defrost is not Defrost lead wire is cut. Check if defrost lead wire is cut with a Reconnect Lead working. tester. Wire. Defective defrost driving relay. Check the voltage of CON2 (1 and 7) Replace relay (RY 7 Refer to load with a tester after pressing main and RY 3) or PCB.
  • Page 73 Problems Symptom Causes Checks Measures Remarks Defective Buzzer rings Trouble mode indication. Check trouble diagnosis function. Repair troubles Refer to mode display button. but key does indication in not sense even function button is explanations. pressed. Door Buzzer Buzzer Defective connecting lead wire from Check lead wire associated with door Repair lead wire.

  • Page 74: Cooling Cycle Heavy Repair

    TROUBLE DIAGNOSIS 3. Cooling Cycle Heavy Repair 3-1. The Heavy Repair Standards for Refrigerator with R134a Refrigerant Items Unit Standards Purposes Remarks Pipe and piping Min. Pipe:within 1 hour. To protect The opening time should be reduced to a system opening time. Comp:within Moisture half of the standards during rain and...
  • Page 75 TROUBLE DIAGNOSIS 3-2. Summary Of Heavy Repair Process Contents Tools Trouble diagnosis Remove refrigerant - Cut charging pipe ends and discharge refrigerant from Filter, side cutters Residuals drier and compressor. - Use R134a oil and refrigerant for compressor and drier Pipe Cutter, Gas welder, N - Confirm N sealing and packing conditions before use.
  • Page 76 TROUBLE DIAGNOSIS 3-3. Precautions During Heavy Repair Items Precautions 1. Use of tools. 1) Use special parts and tools for R134a. 2. Removal of retained 1) Remove retained refrigerant more than 5 minutes after turning off a refrigerator. refrigerant. (If not, oil will leak inside.) 2) Remove retained refrigerant by cutting first high pressure side (drier part) with a nipper and then cut low pressure side.
  • Page 77 TROUBLE DIAGNOSIS 3-4. Practical Work For Heavy Repair Items Precautions 1. Removal of residual Evaporator Low pressure side refrigerant. KEYPOINTING Observe the sequence for Compressor removal of refrigerant. Drier (If not, compressor oil may Suction leak.) High pressure side Release Condenser Refrigent Intake...
  • Page 78 TROUBLE DIAGNOSIS Items Precautions 4.Vacuum degassing. Evaporator Suction pipe Compressor Drier Condenser pressure High Blue pressure Yellow Vaccum KEYPOINTING Pump - If power is applied during vacuum degassing, vacuum degassing shall be more effective. Pipe Connection - Operate compressor Connect a red hose to the high pressure side and a blue hose to the while charging refrigerant.
  • Page 79 TROUBLE DIAGNOSIS Items Precautions Evaporator Compressor Drier Condenser Bombe 4) Refrigerant Charging Charge refrigerant while operating a compressor as shown above. 5) Pinch a charging pipe with a pinch-off plier after completion of charging. 6) Braze the end of a pinched charging pipe with copper brazer and take a gas leakage test on the welded parts.
  • Page 80 TROUBLE DIAGNOSIS 3-6. Brazing Reference Drawings 1) Asia / Middle-East Africa PIPE ASSEMBLY HOT LINE PIPE ASSEMBLY HOT LINE (Refrigerator) (Freezer) Copper(Silver) Copper Brazer Brazer CAPI - TUBE DRIER ASSEMBLY Copper(Silver) Silver Brazer Brazer PIPE ASSEMBLY PIPE ASSEMBLY JOINT SUCTION Copper Brazer PIPE ASSEMBLY...

  • Page 81: How To Deal With Claims

    TROUBLE DIAGNOSIS 4. HOW TO DEAL WITH CLAIMS 4-1. Sound Problems Checks and Measures I Explain general principles of sounds. "Whizz" sounds • All refrigerator when functioning properly have normal operating sound. The compressor and fan produce sounds. There is a fan in the freezer compartment which blows cool air to freezer and refrigerator compartments.
  • Page 82 TROUBLE DIAGNOSIS Problems Checks and Measures I Explain the flow of refrigerant. Sounds of water flowing • When the refrigerator stops, the water flowing sound happens. This sound happens when the liquid or vapor refrigerant flows from the evaporator to compressor. I Explain the characteriistics of moving parts.
  • Page 83 TROUBLE DIAGNOSIS 4-2. Measures for Symptoms on Temperature Problems Checks and Measures I Check temperature set in the temperature control knob. Refrigeration is weak. • 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”...
  • Page 84 TROUBLE DIAGNOSIS 4-3. Odor and Frost Problems Checks and Measures I Explain the basic principles of food odor. Odor in the refrigerator compartment. • Each food has its own peculiar odor. Therefore it is impossible to prevent or avoid food odor completely when food is stored in the completely sealed refrigerator compartment.
  • Page 85 TROUBLE DIAGNOSIS 4-5. Others Problems Checks and Measures I Explain the principles of radiator. The refrigerator case is hot. • The radiator pipes are installed in the refrigerator case and partition plate between the refrigerator and the freezer compartment in order to prevent condensation formation.

  • Page 86: How To Disassemble And Assemble

    HOW TO DISASSEMBLE AND ASSEMBLE 1. DOOR (3) Disconnect upper hinge from a hinge supporter by grasping the front part of upper hinge and lifting up (Hinge Assembly, U) in arrow direction A and pull 1) Remove lower cover and then disconnect water forward in arrow B direction.

  • Page 87: Handle

    HOW TO DISASSEMBLE AND ASSEMBLE 2. HANDLE 3. SHROUD, GRILLE FAN 1) Put blade screwdriver into a groove on the side of a 1) Loosen two screws after disconnecting a cap screw of a Deco handle and lift up a little bit in arrow direction grille fan(U) with a balde screwdriver.

  • Page 88: Water Valve Disassembly Method

    HOW TO DISASSEMBLE AND ASSEMBLE 4. WATER VALVE DISASSEMBLY 4). Separate the Mechanical Cover and Valve Screw. METHOD Mechanical Cover 1) Turn off the power of the refrigerator (pull out the plug). Open the FREEZER and REFRIGERATOR Door and disassemble the Lower Cover. 5) Separate the housing and pull out the valve.

  • Page 89: Dispenser

    HOW TO DISASSEMBLE AND ASSEMBLE 6. DISPENSER 4) Loosen four screws with a phillips screwdriver and pull the funnel assembly to disconnect. 1) Disconnect funnel and button assembly by pulling down and forward. 5) The duct cap assembly can be disconnected if the hold lever connecting screw is loosened with a phillips driver.
  • Page 90 HOW TO DISASSEMBLE AND ASSEMBLE 7) Dispenser Related Parts FRAME ASSEMBLY, DISPLAY COVER, DISPENSER DECO, FRAME DISPLAY PWB(PCB) ASSEMBLY, DISPLAY FUNNEL ASSEMBLY MICRO SWITCH FRAME, FUNNEL 10 LEVER(SWITCH) 11 FUNNEL 12 BUTTON LEVER 13 HOLLDER BUTTON 14 SOLENOID ASSEMBLY 15 SPRING 16 LEVER HOLDER 17 CAP ASSEMBLY, DUCT 18 CAP, DUCT...

  • Page 91: Exploded View

    #EV# EXPLODED VIEW FREEZER DOOR PART: GR-P227/L227/P257/L257 200A 612A 611B 201A 202A 606A 600A 610A 614A 205A 210B 210B 210B 203A - 89 -...
  • Page 92 #EV# EXPLODED VIEW Ref No. : GR-P227/GR-P257 REFRIGERATOR DOOR PART : Optional part 241A 241C 230A 241B 232A 231A 212G 243A 240A 264B 617A 250A 264C 205A 260A 264A 243A 240B 240C 240D 233A 240E - 90 -...
  • Page 93 #EV# EXPLODED VIEW Ref No. : GR-L227/GR-L257 REFRIGERATOR DOOR PART : Optional part 241A 230A 241C 241B 232A 231A 239A 205A 243A 205E 205C 240A 243A 240A 205B 240C 205D 205F 233A 240D 240E - 91 -...

  • Page 94: Freezer Compartment

    #EV# EXPLODED VIEW FREEZER COMPARTMENT : Optional part 270A 101B 271B 271A 137B 137A 136D 402A 403A 136B 136C 136A 135A 152A 120B 128C 130A 302B 120B 401A 128C 128D 120C 128E 128D 400A 128F 120D 621A 623B 125A 621B 272A 103A 408A...

  • Page 95: Refrigerator Compartment

    #EV# EXPLODED VIEW REFRIGERATOR COMPARTMENT : Optional part 625A 101A 270B 271B 146A 140A 271C 626C 626B 626A 115A 116A 140A 149E 115C 115B 142C 142B 402A 142A 140A 151A 142D 152A 624C 151C 151B 401A 177A 166B 166B 166C 166C 177B 162A...

  • Page 96: Machine Compartment

    #EV# EXPLODED VIEW MACHINE COMPARTMENT : Optional part 406A 502A 410H 410G 303A 500A 303B 502B 304A 303C 313A 316A 300A 310B 307A 307A 317A 301A 317B 104A 306A 308B 309A 309C 305A 403B 305B 310A 309B 305C 308C 308A 305C 305B - 94 -...
  • Page 97 EXPLODED VIEW ICE & WATER PART : Optional part 625A 616F 616G 627A 624B 600A 607A 619A 404A 602A 619A 605A 620A 620B 604A 603B 601A 603A 404B 621B - 98 -...
  • Page 98 #EV# EXPLODED VIEW DISPENSER PART : Optional part 278A 278C 402C 278B 276A 275A 405A 276B 501A 280A 279B 278D 280B 280C 281A 279A - 95 -...
  • Page 99 P/No. 3828JD8999A FEB., 2006 Printed in Korea...

This manual is also suitable for:

Gr-p257Gr-l227Gr-l257Gc-p227Gc-l227

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