LG Electronics GR-P227, GR-P257, GR-L227, GR-L257 User Manual

CAUTION

PLEASE READ CAREFULLY THE SAFETY PRECAUTIONS OF THIS BOOK BEFORE CHECKING OR OPERATING THE REFRIGERATOR.

REFRIGERATOR

SERVICE MANUAL

MODEL: GR-P227/L227

COLOR: TITANIUM

http://eic.lgservice.com

GR-P257/L257

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 .............................................................................................................................................................. 16

EXPLATION FOR MICOM CIRCUIT..................................................................................................................................... 26

EXPLANATION FOR PWB CIRCUIT ..................................................................................................................................26

ICE MAKER AND DISPENSER OPERATION PRINCIPLE AND REPAIR METHOD.......................................................... 41

OPERATION PRINCIPLE ....................................................................................................................................................41

ICEMAKER FUNCTIONS....................................................................................................................................................42

DEFECT DIAGNOSIS FUNCTION......................................................................................................................................43

CIRCUIT................................................................................................................................................................................ 44

TROUBLE DIAGNOSIS........................................................................................................................................................ 45

TROUBLE SHOOTING ...................................................................................................................................................... 45

FAULTS .............................................................................................................................................................................. 55

COOLING CYCLE HEAVY REPAIR ................................................................................................................................... 72

HOW TO DEAL WITH CLAIMS.......................................................................................................................................... 79

HOW TO DISASSEMBLE AND ASSEMBLE....................................................................................................................... 84

DOOR................................................................................................................................................................................. 84

HANDLE ............................................................................................................................................................................. 85

SHROUD, GRILLE FAN ..................................................................................................................................................... 85

WATER VALVE DISASSEMBLY METHOD ........................................................................................................................ 86

FAN AND FAN MOTOR DISASSEMBLY METHOD........................................................................................................... 86

DISPENSER....................................................................................................................................................................... 87

EXPLODED VIEW ................................................................................................................................................................ 89

- 2 -

WARNINGS AND PRECAUTIONS FOR SAFETY

Please observe the following safety precautions in order to use safely and correctly the refrigerator and to prevent accident and danger during repair.

1. Be care of an electric shock. Disconnect power cord from wall outlet and wait for more than three minutes before replacing PWB parts. Shut off the power whenever replacing and repairing electric components.

2. When connecting power cord, please wait for more than five minutes after power cord was disconnected from the wall outlet.

3. Please check if the power plug is pressed down by the refrigerator against the wall. If the power plug was damaged, it may cause fire or electric shock.

4. If the wall outlet is over loaded, it may cause fire. Please use its own individual electrical outlet for the refrigerator.

5. Please make sure the outlet is properly earthed, particularly in wet or damp area.

8. Do not fray, damage, machine, heavily bend, pull out, or twist the power cord.

9. Please check the evidence of moisture intrusion in the electrical components. Replace the parts or mask it with insulation tapes if moisture intrusion was confirmed.

10. Do not touch the icemaker with hands or tools to confirm the operation of geared motor.

11. Do not let the customers repair, disassemble, and

reconstruct the refrigerator for themselves. It may cause accident, electric shock, or fire.

12. Do not store flammable materials such as ether, benzene, alcohol, chemicals, gas, or medicine in the refrigerator.

13. Do not put flower vase, cup, cosmetics, chemicals, etc., or container with full of water on the top of the refrigerator.

6. Use standard electrical components when replacing them.

7. Make sure the hook is correctly engaged. Remove dust and foreign materials from the housing and connecting parts.

14. Do not put glass bottles with full of water into the freezer. The contents shall freeze and break the glass bottles.

15. When you scrap the refrigerator, please disconnect the door gasket first and scrap it where children are not accessible.

- 3 -

SPECIFICATIONS

1. Ref No. : GR-P227

ITEMS SPECIFICATIONS

DIMENSIONS (mm) 894(W)X790(D)X1753(H)

NET WEIGHT (kg) 132

COOLING SYSTEM Fan Cooling

TEMPERATURE CONTROL Micom Control

DEFROSTING SYSTEM Full Automatic

Heater Defrost

INSULATION Cyclo-Pentane

COMPRESSOR P.T.C. Starting Type

EVAPORATOR Fin Tube Type

CONDENSER Wire Condenser

REFRIGERANT R134a (180g)

LUBRICATING OIL FREOL @10G (310 cc)

CAPILLARY TUBE ID 0.83

DRIER MOLECULAR SIEVE XH-7

ITEMS SPECIFICATIONS

FIRST DEFROST 4 - 5 Hours

DEFROST CYCLE 13 - 15 Hours

DEFROSTING DEVICE Heater, Sheath

ANTI SWEAT HEATER Dispenser Duct Door Heater

Dispenser Heater

Home Bar Heater

ANTI-FREEZING HEATER Damper Heater

FREEZER LAMP 40W (1 EA)

REFRIGERATOR LAMP 40W (1 EA) / 30W (1 EA)

948

894

602

1753

662

711

790

1135.5

- 4 -

SPECIFICATIONS

2. Ref No. : GR-L227

ITEMS SPECIFICATIONS

DIMENSIONS (mm) 894(W)X790(D)X1753(H)

NET WEIGHT (kg) 132

COOLING SYSTEM Fan Cooling

TEMPERATURE CONTROL Micom Control

DEFROSTING SYSTEM Full Automatic

Heater Defrost

INSULATION Cyclo-Pentane

COMPRESSOR P.T.C. Starting Type

EVAPORATOR Fin Tube Type

CONDENSER Wire Condenser

REFRIGERANT R134a (180g)

LUBRICATING OIL FREOL @10G (310 cc)

CAPILLARY TUBE ID 0.83

ITEMS SPECIFICATIONS

DRIER MOLECULAR SIEVE XH-7

FIRST DEFROST 4 - 5 Hours

DEFROST CYCLE 13 - 15 Hours

DEFROSTING DEVICE Heater, Sheath

ANTI SWEAT HEATER Dispenser Duct Door Heater

Dispenser Heater

ANTI-FREEZING HEATER Damper Heater

FREEZER LAMP 40W (1 EA)

REFRIGERATOR LAMP 40W (1 EA) / 30W (1 EA)

948

894

602

662

1753

711

790

1135.5

- 5 -

SPECIFICATIONS

1. Ref No. : GR-P257

ITEMS SPECIFICATIONS

DIMENSIONS (mm) 894(W)X875(D)X1753(H)

NET WEIGHT (kg) 132

COOLING SYSTEM Fan Cooling

TEMPERATURE CONTROL Micom Control

DEFROSTING SYSTEM Full Automatic

Heater Defrost

INSULATION Cyclo-Pentane

COMPRESSOR P.T.C. Starting Type

EVAPORATOR Fin Tube Type

CONDENSER Wire Condenser

REFRIGERANT R134a (180g)

LUBRICATING OIL FREOL @10G (310 cc)

CAPILLARY TUBE ID 0.83

DRIER MOLECULAR SIEVE XH-7

ITEMS SPECIFICATIONS

FIRST DEFROST 4 - 5 Hours

DEFROST CYCLE 13 - 15 Hours

DEFROSTING DEVICE Heater, Sheath

ANTI SWEAT HEATER Dispenser Duct Door Heater

Dispenser Heater

Home Bar Heater

ANTI-FREEZING HEATER Damper Heater

FREEZER LAMP 40W (1 EA)

REFRIGERATOR LAMP 40W (1 EA) / 30W (1 EA)

948 894

687

1753

747

796

875

1220.5

- 4 -

SPECIFICATIONS

2. Ref No. : GR-L257

ITEMS SPECIFICATIONS

DIMENSIONS (mm) 894(W)X875(D)X1753(H)

NET WEIGHT (kg) 132

COOLING SYSTEM Fan Cooling

TEMPERATURE CONTROL Micom Control

DEFROSTING SYSTEM Full Automatic

Heater Defrost

INSULATION Cyclo-Pentane

COMPRESSOR P.T.C. Starting Type

EVAPORATOR Fin Tube Type

CONDENSER Wire Condenser

REFRIGERANT R134a (180g)

LUBRICATING OIL FREOL @10G (310 cc)

CAPILLARY TUBE ID 0.83

ITEMS SPECIFICATIONS

DRIER MOLECULAR SIEVE XH-7

FIRST DEFROST 4 - 5 Hours

DEFROST CYCLE 13 - 15 Hours

DEFROSTING DEVICE Heater, Sheath

ANTI SWEAT HEATER Dispenser Duct Door Heater

Dispenser Heater

ANTI-FREEZING HEATER Damper Heater

FREEZER LAMP 40W (1 EA)

REFRIGERATOR LAMP 40W (1 EA) / 30W (1 EA)

948 894

687

1753

747

796

875

1220.5

- 5 -

PARTS IDENTIFICATION

1. Ref No. : GR-P227/GR-P257 (INTERNAL FILTER)

Frame Display

Cover PWB

Dispenser Lamp

Ice & Water

Dispenser Button

Home Bar

Automatic Icemaker

Shelf

Lamp

Shelf

Drawer

Door rack

Freezer compartment

Refrigerator compartment

Water Tube

Milk product corner

Lamp

Door Rack

Shelf Can Server Wine holder

(Plastic or wire) Refreshment center(Optional)

Shelf (Folding or Normal)

Egg Box

Vegetable Drawer

(Optional)

Drawer

Door rack

Lower cover

Humidity Switch

Miracle Zone (Optional) Fresh compartment (Optional)

Door Rack

Conversion switch (Meats/Vegetables) (Optional)

- 6 -

PARTS IDENTIFICATION

2. Ref No. : GR-P227/GR-P257 (EXTERNAL FILTER)

Frame Display

Dispenser Lamp

Ice & Water

Dispenser Button

Home Bar

Cover PWB

Automatic Icemaker

Shelf

Lamp

Shelf

Drawer

Door rack

Drawer

Door rack

Lower cover

Freezer compartment

Refrigerator compartment

Milk product corner

Lamp

Door Rack

Shelf Can Server Wine holder

(Plastic or wire) Refreshment center(Optional)

Shelf (Folding or Normal)

Egg Box

Vegetable Drawer

Humidity Switch

Miracle Zone (Optional) Fresh compartment (Optional)

Door Rack

Conversion switch (Meats/Vegetables) (Optional)

(Optional)

- 7 -

PARTS IDENTIFICATION

3. Ref No. : GR-P227/GR-P257 (INTERNAL FILTER)

Frame Display

Cover PWB

Dispenser Lamp

Ice & Water

Dispenser Button

Automatic Icemaker

Shelf

Lamp

Shelf

Drawer

Door rack

Freezer compartment

Refrigerator compartment

Water Tube

Milk product corner

Lamp

Door Rack

Shelf Can Server Wine holder

(Plastic or wire) Refreshment center(Optional)

Shelf (Folding or Normal)

Egg Box

Vegetable Drawer

(Optional)

Drawer

Door rack

Lower cover

Humidity Switch

Miracle Zone (Optional) Fresh compartment (Optional)

Door Rack

Conversion switch (Meats/Vegetables) (Optional)

- 8 -

PARTS IDENTIFICATION

4. Ref No. : GR-P227/GR-P257 (EXTERNAL FILTER)

Frame Display

Dispenser Lamp

Ice & Water

Dispenser Button

Cover PWB

Automatic Icemaker

Shelf

Lamp

Shelf

Drawer

Door rack

Drawer

Door rack

Lower cover

Freezer compartment

Refrigerator compartment

Milk product corner

Lamp

Door Rack

Shelf Can Server Wine holder

(Plastic or wire) Refreshment center(Optional)

Shelf (Folding or Normal)

Egg Box

Vegetable Drawer

Humidity Switch

Miracle Zone (Optional) Fresh compartment (Optional)

Door Rack

Conversion switch (Meats/Vegetables) (Optional)

(Optional)

- 9 -

HOW TO INSTALL REFRIGERATOR

Adjusting Screw

Driver

Height

Difference

Height Difference

1. How to Adjust Door Height of Refrigerator

■ 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. If the height of freezer door is lower than that of refrigerator compartment :

2. If the height of freezer door is higher than that of refrigerator compartment :

Insert a driver  into the groove  of adjusting screw and rotate driver in arrow direction (clockwise) until the refrigerator becomes horizontal.

- 10 -

Insert a driver  into the groove  of adjusting screw and rotate driver in arrow direction (clockwise) until the refrigerator becomes horizontal.

HOW TO INSTALL REFRIGERATOR

Valve Feed Rubber, Packing Connector, Pipe

Tape, TeflonConnector, Pipe

2. How to Install Water Pipe

■ Before Installation

1. The icemaker requires the water pressure of 1.5 -

8.5kgf/cm 180cc with water for 3 seconds)

2. Install booster pump where the city water pressure is below 1.5kgf/cm dispenser.

3. The total length of water pipe shall be less than 12m. Do not bend the pipe at right angle. If the length is more than 12m, there will be troubles on water supply due to water pressure drop.

4. Please install water pipe where there is no heat around.

Class. Shape and Spec. Nomenclature P/No Remarks

Conve-

. (It is acceptable if city water fills a cup of

for normal operation of water and ice

Valve Feed 5221JA3001A Common Use

2-1. When connecting directly to the water tap.

■ Please confirm the following installation parts.

rtible Water Valve

Water Connector

Connector, (MECH) Pipe 4932JA3003B

Connector, (MECH) Pipe 4932JA3003A Conversion Connector(3/4") 6631JA3004A

No Holes

Balance Conector(3/4") 6631JA3004B Packing(ø24x3t) 3920JA3001B

Conversion Connector(W25) 6631JA3004C

No Holes

Balance Conectoor(W25) 6631JA3004D Packing(ø23x3t) 3920JA3001A

Connector, (MECH) Pipe 4932JA3003C Conversion Connector(W28) 6631JA3004E

No Holes

Balance Conector(W28) 6631JA3004F Packing(ø26x3t) 3920JA3001C

Connector, (MECH) Pipe 4932JA3003D Conversion Connector(1/2") 6631JA3004G No Holes Balance Conector(1/2") 6631JA3004H Packing(ø19x3t) 3920JA3001D

- 11 -

HOW TO INSTALL REFRIGERATOR

Single Lever Type Faucet (general)

Feed

Valve

General Type

Feed

Valve

Two Hands Type Faucet Single Lever Type Faucet (one

hole, tech type and hand spray)

Feed

Valve

Feed

Valve

Pipe Connector B

Hot Water

Pipe Connector A

Feed

Valve

Cold Water

How to wind

Sealing Tapes.

Water Tube

Nut

1. Connection of Pipe Connector A and B.

1) Turn off main valve of water pipe.

2) Disconnect water tap from piping by loosening nuts.

3) Connect pipe connector A and B to piping after sealing the pipe connector with sealing tapes.

4) Connect feed valve to pipe connector A.

5) If there is only one tap water pipe, connect pipe connector A only and install feed pipe.

Caution : • Feed pipe should be connected to cold water

line. If it is connected to hot water line, trouble may occur.

• Please check rubber packing when connecting feed pipe.

2. Water Supply

1) After the installation of feed water, plug the refrigerator to the earthered wall outlet, press the water dispenser button for 2 - 3 minutes, and confirm that the water comes out.

2) Check leakage at connecting part, then arrange water tube and locate the refrigerator at its regular place if there is no leaking.

- 12 -

HOW TO INSTALL REFRIGERATOR

Water Tube

Nut

Inlet

Outlet

Connector Type Nut Type

Water

Filter

Filter Inlet

Feed Valve

Hot Water

Cold Water

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.

2. If there is any leakage after installation, cut the water tube at right angle and reassemble.

3. When put the water tube end into the bottle, leave a clearance between bottle bottom and water tube end.

4 Check water coming out and any leakage.

Caution : • If feed tube is more than 4m, less water will come out due to pressure drops.

• Use standard feed tube to prevent leaking.

■ Outternal Filter

1. Filter Fixation

1) There are two types of filter. One is nut type and the other is connector type.

2) Connect feed tube to the filter outlet and water valve connecting tube.

3) Fix the filter at proper place around the sink where it is easy to replace the filter and to receive the cleaning water. Please consider the length of tube shall be less than 8m when locating filter.

2. Filter Cleaning

1) Connect feed tube to the inlet of feed valve and filter.

2) Clean the main valve and feed valve with water for at least one minute until clean water comes out.

- 13 -

Control box

Aligning with the guide line and the fastening indication line

Aligning with the guide line and the loosening indication line

Control box

Separation of red cap

Adhesion sticker

Substitute cap

HOW TO INSTALL REFRIGERATOR

■ Install Water Filter (Applicable to some models only)

■ Before Installing water filter

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.

2. Remove the lamp cover by pressing the protrusion under the cover and pulling the cover to the front.

■ After installing water filter

Reassemble the lamp cover and the top shelf of the refrigerator. To place the top shelf of the refrigerator, raise

■ Installing water filter

1. Initial installation of water filter Remove the filter substitute cap by turning it counterclockwise () by 90 degrees and pulling it down.

Note : Keep it safe to use it later when you do not use the

filter.

Remove the red cap from the filter and attach the sticker. Insert the upper part of the filter () after aligning with the guideline marked on the control box, and fasten it by turning it clockwise by 90 degrees.

Note : Check that the guideline and the fastening

indication line are aligned.

the front part of the shelf a bit so that the hook of the shelf is fit into the groove. In order to clean the water filter system, drain water for about 3 min.

Note : Then open the door of the refrigerator and check for

water droppings on the shelf under the filter.

2. Replacement of water filter While holding the lower part of the filter, turn it counterclockwise () by 90 degrees and pull it down.

Note : Check that the guideline and the loosening

indication line are aligned.

- 14 -

HOW TO INSTALL REFRIGERATOR

Water Amount Indicator Light

Water Amount Selection Button

Power Switch

Feeler Arm

3. How to Control the Amount of Water Supplied to Icemaker.

3-1. Confirm the amount of water supplied to the icemaker.

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. etc.

2) Icemaking stops when the ice bin is full.

3) If you don't want to use the automatic icemaker, turn the icemaker switch to OFF. If you want to use automatic icemaker again, change the switch to ON.

4) The water amount will vary depending on the water amount selection button. Setting, as well as the water pressure of the connected water line.

NOTE

• It is normal that a noise is produced when ice drops into the ice storage bin.

- 15 -

Dispenser Selection Button

Expres Freezer Selection Button

Door Alarm Button/

Lock Button

Dispenser Light On/Off Button/

Filter Status Display RESET Button

Temperature Adjust Button

For Refrigerator Compartment

Temperature Adjust Button For Freezer Compartment

Display Power Saving Mode

Demo Mode

Buzzer Mute Mode

MICOM FUNCTION

1. Monitor Panel

1-1. GR-P227/GR-P257

1-2. Display Second Function

1. Door Alarm Buzzer Mute Mode

Press ALARM/LOCK to turn the buzzer on or off.

2. Display Power saving Mode

It places display in standby mode until door is opened. Press FREEZER and EXPRESS FRZ. buttons simultaneously to turn all LEDs ON and then OFF with the recognition sound of Ding~ after 5 seconds. (Be sure not to press only one button to work.)

- 16 -

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. The mode inactivates when resetting the power.

3. Exhibition Mode

Demo mode is available for displaying the refrigerator in a sales setting or similar condition. It allows the display, dispenser, lights, and fan to operate without running the compressor. To enter the DEMO mode, press and hold the REFRIGERATOR and EXPRESS FRZ. buttons simultaneously for 5 seconds until the Ding~ sounds. To exit the DEMO mode and return to normal operation, press and hold the REFRIGERATOR and EXPRESS FRZ. buttons simultaneously for 5 seconds until the Ding~ sounds again. The refrigerator will default to the NORMAL mode (DEMO mode OFF) if the power fails.

2. Description of Function

2-1-1. Funnction of Temperature Selection

Division Power Initially On 1st Press 2st Press 3th Press 4th Press

Temperature Control

Medium Medium Max Max Min Medium Min

Freezer Control

Refrigeration Control

* The temperature can vary ±3 °C depending on the load condition.

❉ Whenever pressing button, setting is repeated in the order of (Medium) ➝ (Medium Max) ➝ (Max) ➝ (Min) ➝

(Medium Min).

• The actual inner temperature varies depending on the food status, as the indicated setting temperature is a target temperature, not actual temperature within refrigerator.

• Refrigeration function is weak in the initial time. Please adjust temperature as above after using refrigerator for minimum 2~3 days.

-19 °C -22 °C -23 °C -15 °C -17 °C

3 °C 2 °C 0°C 6 °C 4 °C

- 17 -

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. If pressing any display button once with the backlight turned off, buzzer rings and button function is not performed but only backlight is turned on (If pressing the first button with the back light turned off, only back light ON function is performed).

3. If pressing the special freezing button and the freezing temperature adjustment button for more than a second, the back light is turned on and all the graphics of LCD are turned on. If releasing the button, the LCD graphic is displayed in the previous status and the back light is turned off (check LCD graphic and back light ON/OFF status).

2-1-3. Outside temperature display function

1. Outside temperature sensor at the left U of refrigerator senses ambient temperature and displays the outside temperature in the left side of “Outside temperature” text on the LCD of the display part.

2. Ambient temperature is displayed up to -9°C ~ 49°C and displayed as “Lo” for less than -10°C and as “HI” for more than 50°C. If the ambient temperature sensor fails, it is displayed as “Er”.

3. Since display temperature of outside temperature is temperature sensed by the ambient sensor in the hinge U of the freezing room, it may differ from the outside temperature display of other household electrical appliances.

2-1-4. Lock function (display button lock)

1. In power application of refrigerator, the LOCK text is turned off at the right side of lock graphic of display with the lock replease status.

2. If desiring to lock the dislay the dispenser and control panel, push on the LOCK button more than 3 seconds. LOCK is turned on at the right side of lock graphic of display with lock status.

3. The buzzer sound and control panel and dispenser function is not performed even if pressing display button other than lock key in the lock status.

4. If desiring to release the lock status and pressing the lock button more than 3 seconds. LOCK text is turned off at the right side of lock graphic of display with the lock release status.

2-1-5. Filter condition display function

1. There is a replacement indicator light for the water filter cartridge on the dispenser.

2. Water filter needs replacement once six months.

3. Water filter light and FILTER RESET HOLD 3SECS text turn on to tell you need to replace the filter soon.

4. After replacing the filter, press and hold the lock button more than 3seconds. Then water filter light and FILTER RESET HOLD 3SECS text turn off with reset status.

- 18 -

MICOM FUNCTION

Pressing

Switch

2-2. Dispenser use selection

You can select water or ice.

❉ 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.

• The border line is indicated for the selected function.

• “Tak!” sounds if 5 seconds pass after ice comes out. It is sound that the outlet of ice is closed.

REFERENCE : Please wait for 2-3 seconds in order to take final ice slices or drops of

water when taking out cup from the pressing switches after taking ice or water.

2-3. Automatic ice maker

• The automatic ice maker can automatically make 8 pieces of ice cube at a time, 80 pieces a day. But these quantities may be varied according to various conditions including how many times the refrigerator door opens and closes.

• Ice making stops when the ice bin is full.

• If you don’t want to use automatic ice-maker, change the ice-maker switch to ON-OFF. If you want to use automatic ice-maker again, change the switch to OFF-ON.

DISPENSER

NOTE : It is normal that a noise is produced when ice made is dropped into the ice bin.

2-4. When ice maker does not operate smoothly

Ice is lumped together

• When ice is lumped together, take the ice lumps out of the ice bin, break them into small pieces, and then place them into the ice bin again.

• When the ice maker produces too small or lumped together ice, the amount of water supplied to the ice maker need to adjusted. Contact the service center.

✻ If ice is not used frequently, it may lump together.

Power failure

• Ice may drop into the freezer compartment. Take the ice bin out and discard all the ice then dry it and place it back. After the machine is powered again, crushed ice will be automatically selected.

The unit is newly installed

• It takes about 12 hours for a newly installed refrigerator to make ice in the freezer compartment.

2-5. Express Freezer

Please select this function for prompt freezer.

• “On” or “Off” is repeated whenever pressing button.

• The arrow mark graphic remains at the On status after flickering 4 times when selecting Special Refrigeration “On”.

• Super freezer function automatically turns off if a fixed time passes.

2-6. Lock

This button stops operation of different button.

• Locking or Release is repeated whenever pressing the .

• Pressing the other button when selecting ‘ALARM/LOCK’, the button does not operate.

- 19 -

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. SelectingEXPRESS FRZ changes only the speed of the cooling without affecting the set temperature.

4. The temperature can be adjusted even when EXPRESS FRZ has been selected and is in progress.

5. The freezer operates at whatever temperature was set at the time EXPRESS FRZ was selected.

6. If you select EXPRESS FRZ, the compressor and fan will run until it is deselected or the cycle time has elapsed.

(3 hours : compressor and fan run / 3 ~ 24 hours : COLDEST operation)

7. If a defrost cycle occurs while an EXPRESS FRZ is already running, EXPRESS FRZ runs for its remaining cycle time

after the defrost cycle is completed. If the defrost cycle takes longer than 30 minutes, EXPRESS FRZ will run for only 2 hours at the end of the defrost cycle.

8. If you press EXPRESS FRZ during a defrost cycle, the EXPRESS FRZ indicator (LCD or LED, depending upon the

model) will illuminate but the compressor will not operate until the defrost cycle is complete.

9. If you press EXPRESS FRZ within 7 minutes of compressor cut-off, the compressor will not operate until the 7-minute

delay has passed.

10. The freezer fan motor runs at high speed during the EXPRESS FRZ cycle.

2-8. *Miracle Zone function

1. Miracle Zone is located at the bottom room of R-room and maintains optimum temperature depending on foods through

selection of desired foods kept in the Miracle Zone from vegetables to meat with a display. Set temperature in the Miracle Zone by using a separate selection button at the right side of the Miracle Zone. Initial notch is in “veg.”status in application of power. Whenever pressing buttons, notch changes while LED is displayed in the order of “veg. → cheeze → meat → veg.”. Provided that selected notch LED turns off if opening doors of the R-room and it turns off if closing doors of R-room.

2. Temperature of the miracle zone is controlled with a stemping damper at the left side of the miracle zone and controlled

with a miracle zone at the rear side of miracle zone.

3. Change of the notch by temperature control S/W at the miracle zone is controlled after 10 seconds have passed after

selecting final notches.

4. Miracle zone damper is forcedly closed during test mode or defrost mode.

2-9. Control of variable type of freezing room fan

Miracle Zone NOTCH meat cheeze veg.

Setting Indication -1°C2°C4°C

1. To increase cooling speed and load response speed, MICOM variably controls freezing room fan motor at the high speed

of RPM and standard RPM.

2. MICOM only operates in the input of initial power or super freezing operation or load response operation for the high

speed of RPM and operates in the standard RPM in other general operation.

3. If opening doors of freezing / cold storage room or home bar while fan motor in the freezing room operates, the freezing

room fan motor normally operates (If being operated in the high speed of RPM, it converts operation to the standard RPM). However, if opening doors of freezing room or home bar, the freezing room fan motor stops.

4. As for monitoring of BLDC fan motor error in the freezing room, MICOM immediately stops the fan motor by determining

that the BLDC fan motor is locked or poor if there would be position signal for more than 115 seconds at the BLDC motor. Then it displays failure (refer to failure diagnosis function table) at the display part of refrigerator, the BLDC motor doesn’t operate more. If you want to operate the BLDC motor, turn off and on power resource.

- 20 -

Doors of freezing /

cold storage room

or home bar

BUZZER

Closing

Opening

Within

a minute

A minute

seconds30seconds30seconds

Opening

Closing Closing

3 Times 3 Times 3 Times 3 Times

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).

2-11. Door opening alarm

1. Buzzer generates alarm sound if doors are not closed even when more than a minute consecutively has passed with

doors of freezing / cold storage room or home bar opened.

2. Buzzer rings three times in the interval of 0.5 second after the first one-minute has passed after doors are opened and

then repeats three times of On/Off alarm in the cycle of every 30 seconds.

3. If all the doors of freezing / cold storage room or home bar are closed during door open alarm, alarm is immediately

released.

2-12. Ringing of button selection buzzer

1. If pressing the front display button, “Ding ~ “ sound rings.

2-13. Ringing of compulsory operation, compulsory frost removal buzzer

1. If pressing the test button in the main PCB, “Phi ~ “ sound rings.

2. In selecting compulsory operation, alarm sound is repeated and completed in the cycle of On for 0.2 second and Off for

1.8 second three times.

3. In selecting compulsory frost removal, alarm sound is repeated and completed in the cycle of On for 0.2 second , Off for

0.2 second, On for 0.2 second and Off for 1.4 second three times.

2-14. Frost removal function

1. Frost removal is performed whenever total operation time of compressor becomes 7 ~ 7.5 hour.

2. In providing initial power (or returning power failure), frost removal starts whenever total operation time of compressor

becomes 4 ~ 4.5 hour.

3. Frost removal is completed if temperature of a frost removal sensor becomes more than 5°C after starting frost removal.

Poor frost removal is not displaced if it does not arrive at 5°C even if two hours have passed after starting frost removal.

4. No removal is done if frost removal sensor becomes poor (snapping or short-circuit).

- 21 -

MICOM FUNCTION

POWER

COMP

F-FAN

C-FAN

R-STEP MOTOR

DAMPER

HOME

BAR

HEATER

MIRACLE

ZONE STEP

DAMPER

MOTOR

FROST

REMOVAL

HEATER

OFF

HOME

BAR

HEATER

HOME

BAR

HEATER

OFF

FROST

REMOVAL

HEATER

DAMPER

DUCT DOOR

HEATER

DAMPER

DUCT DOOR

HEATER

OFF

0.3

sec.

0.3

sec.

0.3

sec.

0.3

sec.

POWER

PIPE

DISP'

HEATER

sec.

PIPE

DISP'

HEATER

OFF

0.3

sec.

COMP

0.3

sec.

F-FAN

C-FAN

0.3

sec.

R-STEP MOTOR

DAMPER

0.3

sec.

MIRACLE

ZONE STEP

DAMPER

MOTOR

0.3

sec.

HOME

BAR

HEATER

TEST

S/W

(PRESS

Once)

OTHER

LOAD

OFF

COMP

F-FAN

C-FAN

R-STEP MOTOR

DAMPER

MIRACLE

ZONE STEP

DAMPER

MOTOR CLOSE

TEST

S/W

(PRESS

2 Times)

COMP

OFF

F-FAN

C-FAN

OFF

FROST

REMOVAL

HEATER

R-STEP MOTOR

DAMPER

0.3

sec.

0.3

sec.

0.3

sec.

0.3

sec.

0.3

sec.

0.3

sec.

0.3

sec.

0.3

sec.

0.3

sec.

0.3

sec.

0.3

sec.

0.3

sec.

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.

Function Load Operation Sequence Remark

When temperature of a frost removal sensor becomes more than 45°C (In purchase, movement)

In applying Initial power TEST MODE

When temperature of a frost removal sensor becomes less than 45°C (In power failure, service)

Test mode 1 (Compulsory function)

Test mode 2 (Compulsory frost removal)

If error occurs during operation, initial operation is not done.

■

Sequence of load operation when closing F-room and R-room.

If pressing switch once more in the test mode 2 or temperature of a frost removal sensor is more than 5°C, it immediately returns to the test mode for initial operation (COMP operates after 7 minutes).

- 22 -

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. If nonconforming matters occurred are released during display of failure code, MICOM returns to the original state (Reset).

4. Failure code is displayed on the display part of setting temperature for the freezing room and the display part of setting

temperature for the cold storage room of LCD, which are placed at the display part of a refrigerator. All the LCD graphics other than a failure code are turned off.

✽ All LCDs turn off other than freezer room notch temperature display and refrigerator room notch temperature

display(failure code indication part) in case of indicating failure modes(except for Note1, Note2).

- 23 -

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.

3. Function adjustment button is not perceived during performance of test mode.

4. In finishing test mode, always pull the power cord out and then plug-in it again for the normal state.

5. If nonconforming contents such as sensor failure are found during performance of test mode, release the test mode and

display the failure code.

6. Even if pressing the test button during failure code display, test mode will not be performed.

Mode Operation Contents Remarks

Test 1

Test 2

Normal

Status

Press test button once (strong cold mode)

Press test button once at the test mode 1 status (forced defrost mode)

Press test button once at the test mode 2 status

1. Continuous operation of compressor

2. Continuous operation of freezing bldc motor (high-speed RPM) and cooling bldc motor

3. Defrost heater turns off

4. Stepping motor damper is completely opened (open of baffle)

5. Miracle zone stepping motor damper is completely closed.

6. All display LCD graphics turns on.

1. Compressor OFF

2. Freezing bldc motor and cooling bldc motor turn off

3. Defrost heater turns on

4. Stepping motor damper is completely closed (closing of baffle)

5. Miracle zone stepping motor damper is completely closed.

6. All display LCD graphics turns off (only LCD turns on for(A) “MIDIUM” status, (B) “MIDIUM” status)

Return to the initial status.

Freezing fan turns off in door opening

Return to the normal mode when the defrost sensor is above +5°C

Compressor will operate after delay for 7 minutes

- 24 -

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).

2-18. Function of dispenser and water dispenser built-in

1. This is function allowing ice and water to come outside without opening door.

2. If pressing the dispenser switch (rubber button) after selecting ice (cube ice, crushed ice) or water, ice and water equivalent to each come out. However, the duct doors are opened by electrical solenoid valve (Duct Door Solenoid) if pressing the press switch in case of selecting ICE. If pressing the dispenser press switch and then detaching the hands, the duct door is closed after it is opened for 5 seconds.

3. Function allowing ice and water to come stops if freezing room doors are opened.

4. If there is no Off signal even when 3 minutes have passed while pressing the dispenser press switch after selecting ice (cube ice, crushed ice) or water, geared motor and solenoid (Cube, Water) is automatically turned off. However, the solenoid (duct door) is stop 5 seconds after Off (to prevent short-circuit of a coil due to overheat of solenoid).

5. Dispenser Lamp On/Off function Lamp on the dispenser part is turned on if pressing the dispenser press switch after selecting ice (cube ice, crushed ice) or water. If detaching the hands, it is turned off.

6. Selection function of water/crushed/ cube ice

1) This is function to allow selection of water/crushed/ cube ice function depending on user’s selection. Display and

selection is done if pressing the dispenser selection button.

2) In the initial Power On, cube ice is automatically selected.

3) In selecting cube ice, geared motor is operated so that crushed ice can be supplied outside if pressing the press switch

when ice is formed in the ice storage container (Bank, Ice).

4) In selecting cube ice, geared motor is operated so that cube ice can be supplied outside if pressing the press switch

when ice is formed in the ice storage container (Bank, Ice).

7. Water dispenser function

1) LCD is displayed for selection if user selects water at the function adjustment part.

2) Water dispenser function is a type directly connected to a water pipe. The water solenoid valve built-in at the right side

of the M/C room is opened so that water can be supplied if selecting Water from the function adjustment part and then pressing the press switch.

- 25 -

EXPLATION FOR MICOM CIRCUIT

1. Explanation for PWB circuit

1-1. Power circuit

The power circuit includes a Switched Mode Power Supply (SMPS). It consists of a rectifier (BD1 and CE1) converting AC to DC, a switch (IC2) switching the DC voltage, a transformer, and a feedback circuit (IC3 and IC4).

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 VA1 CE1 CE2 CE3 CE4 CE5

Voltage 230 Vac 310 Vdc 16 Vdc 12 Vdc 16 Vdc 5 Vdc

(1) GR-P227/L227

- 26 -

EXPLATION FOR MICOM CIRCUIT

1-2. Oscillation circuit

The oscillation circuit generates a basic clock signal for synchronization and time calculation related to the transmission of data and calculations made by the 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 when power is interrupted or restored. A LOW signal applied to the reset terminal for 10 ms causes the MICOM to reset itself. During normal operation, the voltage at the reset terminal is 5 Vdc. If the reset fails, the MICOM will not operate.

(1) GR-P227/L227/P257/L257

- 27 -

EXPLATION FOR MICOM CIRCUIT

1-4. Load/dispenser operation, door opening circuit

1. LOAD DRIVING CIRCUIT

✽ The fan operates at the regular speed even if the door of the refrigerator or freezer is opened. When the doors are closed,

the fan reverts to its original speed.

✽ (A), (B), (C), and (D) of door switch for the freezer or refrigerator are connected to the door open sensing circuit in parallel

toward both ends of switch to determine door open at MICOM.

✽ In the TEST mode, the fan will stop if any door is opened. It will resume operation when the door is closed.

Type of Load Compressor

Measuring part (IC6) IC6-16 IC6-13 IC6-12 IC6-15 IC6-14

Status

(1) GR-P227/L227/P257/L257

ON Within 1 V

OFF 12 V

Defrost

Heater

AC Converting

Relay

Refrigerator

LAMP

Dispenser

Heater

- 28 -

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