LG LSC27926 Service Manual

REFRIGERATOR

SERVICEMANUAL

CAUTION

PLEASE READCAREFULLY THE SAFETY PRECAUTIONS OF THIS MANUAL
BEFORECHECKING OR OPERATING THE REFRIGERATOR.

MODEL : LSC27926**

CONTENTS

WARNINGS AND PRECAUTIONS FOR SAFETY ................................................................................................................ 3

SPECIFICATIONS................................................................................................................................................................... 4

PARTS IDENTIFICATION....................................................................................................................................................... 5

HOW TO INSTALL THE REFRIGERATOR .......................................................................................................................... 6

HOW TO ADJUST DOOR HEIGHT.................................................................................................................................... 6

FILTER................................................................................................................................................................................ 7

HOW TO CONTROL THE ICEMAKER WATER SUPPLY.................................................................................................. 8

MICOM FUNCTION .............................................................................................................................................................. 10

EXPLANATION OF MICOM CIRCUIT.................................................................................................................................. 23

EXPLANATION OF PWB CIRCUIT.....................................................................................................................................23

PWB PARTS DIAGRAM AND LIST.....................................................................................................................................40

PWB CIRCUIT DIAGRAM...................................................................................................................................................43

ICE MAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR ...........................................................................46

WORKING PRINCIPLES.................................................................................................................................................... 46

FUNCTION OF ICE MAKER .............................................................................................................................................. 47

ICE MAKER TROUBLESHOOTING................................................................................................................................... 48

ICE MAKER CIRCUIT .........................................................................................................................................................49

CIRCUIT................................................................................................................................................................................ 53

TROUBLE DIAGNOSIS........................................................................................................................................................ 54

TROUBLESHOOTING ....................................................................................................................................................... 54

FAULTS .............................................................................................................................................................................. 64

COOLING CYCLE HEAVY REPAIR ................................................................................................................................. 81

HOW TO DEAL WITH CLAIMS ........................................................................................................................................ 88

HOW TO DISASSEMBLE AND ASSEMBLE..................................................................................................................... 93

DOOR............................................................................................................................................................................... 93

HANDLE........................................................................................................................................................................... 94

FAN SHROUD GRILLE .................................................................................................................................................... 95

ICEMAKER ASSEMBLY................................................................................................................................................... 95

DISPENSER..................................................................................................................................................................... 96

EXPLODED VIEW &

REPLACEMENT PARTS LIST ........................................................................................................................................... 98

- 2 -

WARNINGS AND PRECAUTIONS FOR SAFETY

Please observe the following safety precautions to use the
refrigerator safely and correctly and to prevent accident or
injury when servicing.

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

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

3. Please check if the power plug is pressed by the
refrigerator against the wall. If the power plug was
damaged, it could cause re or electric shock.

4. If the wall outlet is overloaded, it may cause a re.
Please use a dedicated circuit for the refrigerator.

5. Please make sure the outlet is properly grounded.
Particularly in a wet or damp area.

6. Use standard electrical components.

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

8. Do not fray, damage, run over, kink, bend, pull out, or
twist the power cord.

9. Please check for evidence of moisture intrusion in the
electrical components. Replace the parts or mask with
insulation tape if moisture intrusion was conrmed.

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

11. Do not suggest that customers repair their refrigerator

themselves. This work requires special tools and
knowledge. Non-professionals could cause re, injury,
or damage to the product.

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

13. Do not put anything on top of the refrigerator,
especially something containing water, like a vase.

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

15. When you scrap or discard the refrigerator, remove the
doors and dispose of it where children are not likely to
play in or around it.

- 3 -

SPECIFICATIONS

ITEMS SPECIFICATIONS

DIMENSIONS 912X829X1771 mm

WXD

X

H

(35.9x32.6x69.7in)

286.6

).sbl(gk301THGIEWTEN

COOLING SYSTE Fan Cooling

TEMPERATURE CONTROL

DEFROSTING SYSTEM

Micom Control

Full Automatic

Heater Defrost

enatneP-olcyCNOITALUSNI

COMPRESSOR

EVAPORATOR

CONDENSER

REFRIGERANT

LUBRICATING OIL

PTC Starting Type

Fin Tube Type

Wire Condenser

R134a(185g)(6.5oz)

FREOL @ 10G(310cc)

ITEMS SPECIFICATIONS

CAPILLA R Y TUBE ID Ø0.8 5

FIRST DEFROST

DEFROST CYCLE

DEFROSTING DEVICE

ANTI-SWEAT HEATER

4-5 Hours

13-15 Hours

Heater, Sheath

Dispenser Duct Door Heater

Dispenser Heater

ANTI-FREEZING HEATER

Water Tank Heater

Damper Heater

FREEZER LAMP

REFRIGERATOR LAMP

DISPENSER LAMP

40W (1 EA)

40W (4 EA)

15W (1 EA)

7-HXEVEISRALUCELOMREIRD

in.)

16

/

1
1

1771 mm (69

in.)

in.)

2

/

1

1741.5 mm (68

in.)

4

/

16

3

/

1
1

1771 mm (69

1746.5 mm (68

1004 mm (391/2 in.)

912 mm (35.9in.)

1

weiVpoTweiVtnorF

in.)

in.)

in.)

2

8

8

/

/

/

5

5

5

829 mm (32

724 mm (28

779 mm (30

in.)

in.)

8

/

16

5

/

897 mm (35

1261 mm (49

- 4 -

PARTS IDENTIFICATION

Frame Display

Dispenser Lamp

Ice & Water

Dispenser Button

PWB Cover

Water Tubes

Freezer

Compartment

Refrigerator

Compartment

Humidity Switch

Lamp

Shelf

Snack Drawer

Vegetable Drawer

Vegetable Drawer
/Meat Drawer

Door Rack

Shelf

Door Rack

Wine Holder

Lamp

Lower Cover

Dairy Product Corner

Door Rack

Drawer

(Wire/Plastic)

Automatic

Icemaker

Door Rack

Shelf

Bottle Guide

Door Rack

Water Filter

Egg Box

- 5 -

HOW TO INSTALL REFRIGERATOR

1. How to Adjust Door Height of Refrigerator

Make the refrigerator level first. (If the refrigerator is not installed on a flat floor, the height of freezer and refrigerator
door may not be the same.)

1. If the freezer door is lower than the refrigerator
door:

2. If the freezer door is higher than the refrigerator
door:

1 2

Z

-

- 6

HOW TO INSTALL REFRIGERATOR

2. Filter

Replace the filter when the indicator light comes on or the
performance of the icemker or water dispenser decreases
noticeably.

After changing the water filter cartridge, reset the water
filter status display and indicator light by pressing and
holding the BUTTON for 3 seconds.(page 18)

1. Remove the old cartridge.

Twist the knob of the cartridge counter clockwise.

2. Replace with a new cartridge.

Take the new cartridge out of its packaging and remove
protective cover from the o-rings.

With cartridge knob in the vertical position, push the new
filter cartridge into the cover until it stops.

If you can’t turn the filter from side to side, it isn’t fully
inserted. Push it in firmly and twist it into place. You will
hear the snap when it clicks into place.

Using the handle, twist the cartridge clockwise about 1/4
turn.

When the cartridge is removed, you will feel it click .

Pull out the cartridge.

NOTE: There will be some water(25cc) in the filter

cartridge. Some spilling may occur. Catch it in a
bowl or towel.

3. Flush the Water System After Replacing Filter Dispense

water through the water dispenser for 3 minutes to
purge the system.
There may be a little air in the line, causing noise or
hissing. Run the water at the dispenser until the hissing
stops to purge the air from the system.

NOTE: - To purchase replacement water filter cartridges,

visit your local appliance dealer or part distributor.

- You can also visit our website :
www.lgappliances.com or call 1-877-714-7481.

- 7 -

HOW TO INSTALL REFRIGERATOR

2

1

Test Switch

Confirm the amount

of water

Ice maker

Too much

Too little

Optimum level

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

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

1. Pull out the ice bin shelf in the upper part of the freezer compartment.

Caution : • Do not put hands or tools into the chute to confirm

the operation of geared motor.
It may damage the refrigerator or hurt your hands.

2. Apply electricity after connecting water pipe.

1) Press test switch under the icemaker for two seconds as shown below.

2) The bell rings(ding~dong) and ice tray rotates and water comes out from the icemaker water tube.

3) The water shall be supplied two or three times into the tray. The amount of water supplied for each time is small.
Put a water container under the ice tray and press test switch.

4) When ice tray rotates, the water in it will spill. Collect the spilt water and throw away into the sink.

5) When ice tray has finished rotation, water comes out from the water tube. Confirm the amounts of water in the ice tray.
(refer to fig. The optimum amount of water is 110cc)

* It is acceptable if the adjusted level of water is a bit smaller than optimum level.

- 8 -

HOW TO INSTALL REFRIGERATOR

Conrm the amount

of water

Optimum level

3-2. Control the amount of water supplied to the icemaker.

Caution : • Please unplug the power cord from the wall outlet and wait for more than three minutes before disconnecting

PWB cover as 310V is applied in the control panel.

1. Disconnect PWB cover from the upper part of the refrigerator.

2. Adjust the amount of water supplied by using DIP switch.

Water Supplying Time Control Option

LSC27926**

No

DIP SWITCH SETTING

S1 S2 S3

OFF OFF OFF 6.5 SEC

1

ON OFF OFF 5.5 SEC

2

OFF ON OFF 6 SEC

3

ON ON OFF 7 SEC

4

OFF OFF ON 7.5 SEC

5

ON OFF ON 8 SEC

6

OFF ON ON 9 SEC

7

ON ON ON 10 SEC

8

WATER

SUPPLY TIME

* The quantity of water

supplied depends on DIP
switch setting conditions
and water pressure as it
is a direct tap water
connection type. (the
water supplied is
generally 80 cc to 120 cc)

* DIP switch is on the main

PWB.

(+) Driver

REMARKS

1) The water supplying time is set at ve seconds when the refrigerator is delivered.

2) The amount of water supplied depends on the setting time and water pressure (city water pressure).

3) If ice cube is too small, increase the water supplying time. This happens when too small water is supplied into the ice tray .

4) If ice cube sticks together, decrease the water supplying time. This happens when too much water is supplied into the ice tray.

Caution : When adjusting the amount of water supplied, adjust step by step. Otherwise the water may spill over.

Switch ON

Switch OFF

ON

1

2 3

3. When adjustment of control switch for the amount of water supplied is complete, check the level of water in the ice tray.

- 9 -

MICOM FUNCTION

1. Monitor Panel

ICE PLUS DISPENSER FREEZER REFRIGERATOR LIGHT/FILTER ALARM/LOCK 3SECS

°C

°F

Ice Plus

function selection button

Dispenser selection
button

Temperature adjustment button
for freezer compartment

Alarm button and

Lock button

Lamp On/O button/

Filter status display RESET button

Temperature adjustment button

for refrigerator compartment

- 10 -

1-3. Display Second Function

1. Buzzer sound mute Mode

The buzzer sound is set to OFF.
It activates by sounding the recognition sound of “Ding~” after pressing and holding ICE PLUS” button more than 5
seconds. It inactivates when resetting the mode power.

2. Display Power saving Mode

It places display in standby mode until door is opened.
Press “Freezer” and ICE PLUS” buttons simultaneously to turn all leds become ON and then OFF with the recognition
sound of “Ding~” after 5 seconds. (Be sure not to press only one button to work.)
Once the mode activates, the display is always OFF. Until door is opened or display button is pressed. When 30 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. Change Display Degree to Centigrade Mode from Fahrenheit Mode

To change temperature display from Fahrenheit to Celsius press and hold “FREEZER” and “REFRIGERATOR” buttons
simultaneously for more than 5 seconds. Do the same to convert back to Celsius.

4. Exhibition Mode

This function is available when exhibiting a refrigerator in the shopping moll.
Function is inserted with recognition sound “Ding ~” if pressing both the ICE PLUS” button and the “REFRIGERATOR”
button at the same time for more than 5 seconds. If function is inserted, all basic refreezing functions at the R/F room and
the Storage room (COMP, F-FAN, C-FAN) turns off and the display normally operates. However, the dispenser function
normally operates.
The DEMO stops if pressing the button during DISPLAY DEMO, DEMO stops and the display normally operates but
performs DEMO operation again if not pressing the button again for more than 30 seconds (DEMO: Display scenario
when using the display).
Release method is same as input method.
The mode is released if power is reset.

MICOM FUNCTION

- 11 -

ICE PLUS/JET FRZ DISPENSER FREEZER REFRIGERATOR FILTER/LIGHT LOCK

Display Power
saving Mode

Exhibition Mode

Change Display Degree from
Fahrenheit to Centigrade Mode

Buzzer sound
mute Mode

°C

°F

MICOM FUNCTION

2. Description of Function

2-1-1. Function of Temperature Selection

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

Setting
temperature

Temperature
Control

Freezer Control

Refrigeration
Control

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

5
4
3
2
1

Medium Medium Max Max Min Medium Min

-2 °F -5 °F -8 °F7 °F1 °F

37 °F 34 °F 32 °F 46 °F 41 °F

5
4
3
2
1

5
4
3
2
1

5
4
3
2
1

5
4
3
2
1

❉ 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.

• Freezer Notch is fixed “Medium Max” unconcerned with display Notch during ICE Making Control Mode and Ice Maker
Stop switch is selected with “ON”.

2-1-2. Outside temperature display function

1. Outside temperature sensor at the right Hinge Cover - U of refrigerator senses ambient temperature and displays the
outside temperature in the upper of “ROOM TEMP” text on the display part.

2. Ambient temperature is displayed up to 16°F ~ 120°F and displayed as “Lo” for less than 15°F and as “HI” for more than
121°F. 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
refrigerator room, it may differ from the outside temperature display of other household electrical appliances.

- 12 -

MICOM FUNCTION

2-1-3. Lock function (dispenser and display button lock)

1. In power application of refrigerator, the “LOCK” text is turned o 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 text
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 o at the
right side of lock graphic of display with the lock release status.

LOCK CONTROL

LOCK

DISPENSER & BUTTON

LOCK

DISPENSER & BUTTON

2-1-4. Filter condition display function

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

2. Water lter needs replacement once six months.

3. Water lter light and “FILTER RESET HOLD 3SECS” text turn on to tell you need to replace the lter soon.

4. After replece the lter, press and hold the lock button more than 3seconds.
Then water lter light and “FILTER RESET HOLD 3SECS” text turn o with reset status.

Classication

Filter Status

Display

FILTER

FILTER RESET

- 1 3 -

MICOM FUNCTION

DISPENSER

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.

• Each graphic 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 second in order to take nal ice slices or drops

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

DISPENSER

Pressing

Switch

2-3. ICE PLUS

Please select this function for prompt freezer.

• Function is repeated following below whenever pressing ICE PLUS

•

The arrow mark graphic remains at the On status after ickering 4 times when selecting Special Refrigeration ICE PLUS.

•ICE PLUS function automatically turns o

if a xed time passes.

LED

LED

ICE PLUS

2-4. Dispenser Light

• Dispenser switch or dispenser light button turn the dispenser light in the dispenser on and o.

• The dispenser light Function is repeated following below whenever pressing “FILTER RESET/LIGHT” button.

• If dispenser light continuously turns on more than 7 minutes with dispenser light button, the dispenser light turns o
automatically by compulsion.

Dispenser Iight ON/OFF

LED

- 1 4 -

MICOM FUNCTION

2-5. ICE PLUS

1. ICE PLUS is function to improve cooling speed of the freezing room by consecutively operating compressors and

freezing room fan.

2. ICE PLUS is released if power failure occurs and then returns to the original status.

3. Temperature setting is not changed even if selecting the ICE PLUS.

4. The change of temperature setting at the freezing room or the cold storage room is allowed with ICE PLUS

selected and prrocessed.

5. The cold storage room operates the status currently set with ICE PLUS selected and procesed.

6. If selecting the ICE PLUS, the ICE PLUS function is released after continuously operating compressor and

freezing room fan.

7. If frost removal starting time is arrived during ICE PLUS, ICE PLUS operation is done only for the remaining

time after completion of frost removal when the ICE PLUS operation time passes 90 minutes. If passing 90
minutes, ICE PLUS operation is done only for 2 hours after completion of frost removal.

8. If pressing ICE PLUS button during frost removal, the ICE PLUS LCD or LED is turned on but if pressing the

ICE PLUS, compressor operates after the remaining time has passed.

9. If selection ICE PLUS within 7 minutes (delay for 7 minutes of compressor) after the compressor stops,

compressor operates after the remaining time has passed.

10. The freezing room fan motor operates at the high speed of RPM during operation of ICE PLUS.

- 15 -

MICOM FUNCTION

Doors of freezing /
cold storage room

or home bar

BUZZER

Closing

Opening

Within

a minute

A minute

30

seconds30seconds30seconds

Opening

Closing Closing

3 Times 3 Times 3 Times 3 Times

2-8. Control of variable type of freezing fan

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 ICE PLUS 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.

2-9. Control of cooling fan motor

1. The cooling 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).

2-10. 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.

2-11. Ringing of button selection buzzer

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

- 16 -

MICOM FUNCTION

2-12. 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.

2-13. 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).

2-14. Refrigerator room lamp automatically off

• Refrigerator room lamp turn on and off by refrigerator door switch.

• If refrigerator room lamp continuously turns on more than 7 minutes, the refrigerator room lamp turns off automatically by

compulsion.

- 17 -

MICOM FUNCTION

POWER

ON

COMP

ON

F-FAN

&

C-FAN

ON

R-STEP
MOTOR

DAMPER

ON

OPTICHILL

STEP

DAMPER

MOTOR

ON

FROST

REMOVAL

HEATER

OFF

FROST

REMOVAL

HEATER

ON

DAMPER

&

DUCT DOOR

&

OPTICHILL

HEATER ON

DAMPER

&

DUCT DOOR

&

OPTICHILL

HEATER OFF

0.3

sec.

6.0

sec.

0.3

sec.

0.3

sec.

0.3

sec.

POWER

ON

0.3

sec.

PIPE

&

DISP'

HEATER

OFF

0.3

sec.

COMP

ON

0.3

sec.

F-FAN

&

C-FAN

ON

0.3

sec.

R-STEP
MOTOR

DAMPER

ON

0.3

sec.

OPTICHILL

STEP

DAMPER

MOTOR

ON

PIPE

&

DISP'

HEATER

ON

TEST

SWITCH

(PRESS

Once)

OTHER

LOAD

OFF

COMP

ON

F-FAN

&

C-FAN

ON

R-STEP
MOTOR

DAMPER

ON

OPTICHILL

STEP

DAMPER

MOTOR

CLOSE

TEST

SWITCH

(PRESS

2 Times)

COMP

OFF

F-FAN

&

C-FAN

OFF

FROST

REMOVAL

HEATER

ON

R-STEP
MOTOR

DAMPER

CLOSE

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

In applying Initial power TEST MODE

When temperature
of a frost removal

sensor becomes
more than 45°C
(In purchase,

movement)

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).

- 18 -

MICOM FUNCTION

Note1) R2-sensor, OptiChill sensor and water tank sensor, Ice maker-sensor, Ice maker Unit are not indicated on the failure

indicating part but indicated in checking Display(When pressing for more than the button of freezing temperature and
super freezer button for more than 1 second).

R2-sensor (middle room)
or Abnormal Drive Micom
Communication

OptChill sensor or
Water tank sensor

Ice-maing sensor

Ice-maker unit

Ambient sensor
(Better1 Model Only)

Note2) Freezer room notch temperature display and refrigerator room notch temperature display(Failure code indication

part) are normally indicated in abnormal ambient sensor, and “Er” indicated on the amvient temperature
display(except for the ambient temperature display, other LEDs or LCDs are indicated normally)

✻ LCD(LED) check function: If simultaneously pressing express freezer button and freezing temperature adjustment button

for a second, a back light is turned on and all display LCD(LED) graphics on. If releasing the
button, the LCD(LED) graphic displays the previous status, the back light is turned off (LCD
graphic and back light ON/OFF check).

Normal: LED or LCD graphic on the (C) part turns on
Abnormal: LED or LCD graphic on the (C) part turns off

Normal: LED or LCD graphic on the (D) part turns on
Abnormal: LED or LCD graphic on the (D) part turns off

Normal: LED or LCD graphic on the (E) part turns on
Abnormal: LED or LCD graphic on the (E) part turns off

Normal: LED or LCD graphic on the (F) part turns on
Abnormal: LED or LCD graphic on the (F) part turns off

Normal: LED or LCD graphic on the (G) part turns on
Abnormal: LED or LCD graphic on the (G) part turns off

The other LED or
LCD Graphics
Turn On.

- 20 -

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 nished 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 nishing 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.

skrameRstnetnoCnoitarepOedoM

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 o

4. Stepping motor damper is completely opened
(open of bae)

5. Optichil stepping motor damper is completely
closed.

6. All display LEDs or LCD graphics turn on.

1. Compressor OFF

2. Freezing bldc motor and cooling bldc motor
turn o

3. Defrost heater turns on

4. Stepping motor damper is completely closed
(closing of bae)

5. OptiChil stepping motor damper is completely
closed.

6. All display LEDs or LCD graphics turn o.
GR-L267BV(T)RA, GR-L267BV(T,S)PA :
Except for (A)22 (B)22 LEDs
GR-L267BV(T)R : Except for only middle
Notch Bar Graphics

Return to the initial status.

Freezing fan turns o in
door opening.

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

Compressor will operate
after delay for 7 minutes

TEST MODE1 STATUS DISPLAY

°

C

°F

TEST MODE2 STATUS DISPLAY

- 2 1 -

MICOM FUNCTION

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) It 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 Back plate is opened so that water can be supplied if selecting Water from the function adjustment part and then
pressing the press switch.

- 22 -

EXPLANATION FOR MICOM CIRCUIT

1. Explanation for PWB circuit

1-1. Power circuit

The power

to DC, a switch (IC2) switching the DC voltage, a transformer, and a feedback circuit (IC3 and IC4).

Caution : Since high voltage (160 Vdc) is maintained at the power terminal, wait at least 3 minutes after unplugging the

Voltage of every part is as follows:

circuit includes a Switched Mode Power Supply (SMPS). It consists of a rectier (BD1 and CE1) converting AC

appliance to check the voltages to allow the current to dissipate.

Part VA1 CE1 CE2 CE3 CE4 CE5

Voltage 120 Vac 160 Vdc 14 Vdc 12 Vdc 15.5 Vdc 5 Vdc

- 2 3 -

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.

1-4. 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 paralle
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) Check load driving status

Type of Load

Measuring part IC6-11 IC6-10 IC7-15 IC7-13

Status

2) Lever Switch sensing circuit

Measuring part

Lever S/W

On(Press)

GEARED

MOTOR

Frost Removal

Heater

SOLENOID

CUBE

5 V

0 V

AC Converting

Relay

V1nihtiWNO

V21FFO

V1nihtiWNO

V21FFO

IC1(Micom) (No. 16)

V5FFO

Refrigerator

WATER VALVE

WATER

LAMP

SOLENOID

DISPENSER

(60 Hz)

Dispensor

Heater

-24-

EXPLANATION FOR MICOM CIRCUIT

-25-

EXPLANATION FOR MICOM CIRCUIT

3. Door opening sensing circuit

Measuring part

IC1 (MICOM) No. (44, 45) / (45, 46) / (47, 48) Pin

Door of Freezer / Refrigerator

Since door switches (A) and (B) are interconnected, if either fails, the other will not respond properly.
If either switch fails, the light will not come on.

)sutatsffOtaerasdnehtobtahctiwS.D-C,B-A(V5gnisolC

)sutatsnOtaerasdnehtobtahctiwS.D-C,B-A(V0gninepO

- 26 -

EXPLANATION FOR MICOM CIRCUIT

A

B

C

D

F

E

RW1

10KF

CE18

R73

CC32

1-5. Temperature sensing circuit

1-6. Switch entry circuit

The following circuits are sensing signal form the test switch, damper motor reed switch for testing and diagnosing the
refrigerator.

47

46

- 27 -

EXPLANATION FOR MICOM CIRCUIT

1-7. Option designation circuit (model separation function)

The circuits shown above vary according to which features are included on your particular model.

These circuits are preset at the factory and cannot be altered.

•

NOTE: The chart makes absolutely no sense. You have Optichill no matter which way the connection is set.

OP1

1-8. Stepping motor operation circuit

dradnatSnoitacilppAsutatSnoitcennoCnoitarapeS

tsixellihCitpOnoitcennoC

nodllihCitpOTUO ’t exist

-28-

EXPLANATION FOR MICOM CIRCUIT

INA

INB

A

B

A

B

WC )noitator evitisoP()noitator esreveR( WCC

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.

Explanation) The stepping motor is driven by sending signals of 3.33 mSEC via MICOM pins 33, 34, and 35, as shown in

the chart below. These signals are output via terminals 10, 11, 14, and 15 via input terminals 3, 6, and 8 of
IC10 (TA7774F), the motor drive chip. The output signals allow the coils wound on each phase of the stator to
form a magnetic eld, which causes rotation. Input to the terminals INA and INB of IC10 as shown in the chart
below drives the motor.

-29-

EXPLANATION FOR MICOM CIRCUIT

1-9. Fan motor driving circuit (freezer, mechanical area)

1. The circuit cuts all power to the fan drive IC, resulting in a standby mode.

2. This circuit changes the speed of the fan motor by varying the DC voltage between 7.5 Vdc and 16 Vdc.

3. This circuit stops the fan motor by cutting o power to the fan when it senses a lock-up condition.

b

trapetrapbtrapd,a

sselroV2sselroV2V5FFOrotoM

V61~8V41~21V3~2NOrotoM

a

e

d

-30-

EXPLANATION FOR MICOM CIRCUIT

Temperature compensation table at the refrigerator is as follows:

►

Modication

resistance

Current
resistance

470 Ω [0.9 ° F] [1.8 °F] [2.7 ° F] [3.6 °F] [4.5 °F] [5.4 °F] [6.3 °F] [7.2 °F] [8.1 ° F] [9 °F]

2 k Ω [0.9 °F] [0.9 °F] [1.8 °F] [2.7 °F] [3.6 °F] [4.5 °F] [5.4 ° F] [6.3 °F] [7.2 °F] [8.1 °F]

3.3 k Ω [1.8 °F] [0.9 °F] [0.9 °F] [1.8 °F] [2.7 °F] [3.6 °F] [4.5 °F] [5.4 ° F] [6.3 ° F] [7.2 °F]

5.6 k Ω [2.7 °F] [1.8 °F] [0.9 °F] [0.9 °F] [1.8 ° F] [2.7 °F] [3.6 ° F] [4.5 °F] [5.4 °F] [6.3 °F]

8.2 k Ω [3.6 °F] [2.7 °F] [1.8 °F] [0.9 °F] [0.9 °F] [1.8 ° F] [2.7 °F] [3.6 ° F] [4.5 °F] [5.4 °F]

Refrigerator

470 Ω 2 k Ω 3.3 k Ω 5.6 k Ω 8.2 k Ω 10 k Ω 12 k Ω 18 k Ω 33 k Ω 56 k Ω 180 k Ω

No 0.5 ° C 1 ° C 1.5 ° C 2 ° C 2.5 °C 3 °C 3.5 °C 4 °C 4.5 °C 5 ° C

change

0.5 ° C No 0.5 ° C 1 ° C 1.5 °C 2 ° C 2.5 °C 3 ° C 3.5 °C 4 ° C 4.5 °C

Down change

1 °C 0.5 °C No 0.5 ° C 1 ° C 1.5 °C 2 °C 2.5 °C 3 °C 3.5 ° C 4 ° C

Down

1.5 ° C 1 ° C 0.5 ° C No 0.5 ° C 1 °C 1.5 ° C 2 ° C 2.5 ° C 3 ° C 3.5 °C

Down Down Down

2 °C 1.5 °C 1 ° C 0.5 ° No 0.5 ° C 1 ° C 1.5 ° C 2 ° C 2.5 ° C 3 °C

Down Down Down

Up Up Up Up Up Up Up Up Up Up

Up Up Up Up Up Up Up Up Up

Down

change

Up Up Up Up Up Up Up Up

change

Drop

Up Up Up Up Up Up Up

change

Up Up Up Up Up Up

(RCR1) 2.5 °C 2 °C 1.5 ° C 1 ° C 0.5 ° C No 0.5 ° C 1 ° C 1.5 ° C 2 ° C 2.5 °C

10 k Ω [4.5 °F] [3.6 °F] [2.7 °F] [1.8 °F] [0.9 °F] [0.9 °F] [1.8 °F] [2.7 °F] [3.6 °F] [4.5 °F]

Down Down Down Down Down

3 °C 2.5 °C 2 ° C 1.5 °C 1 °C 0.5 °C No 0.5 °C 1 °C 1.5 °C 2 ° C

12 k Ω [5.4 °F] [4.5 °F] [3.6 °F] [2.7 °F] [1.8 °F] [0.9 °F] [0.9 ° F] [1.8 °F] [2.7 °F] [3.6 °F]

Down Down Down Down Down Down

3.5 ° C 3 ° C 2.5 ° C 2 ° C 1.5 °C 1 °C 0.5 °C No 0.5 °C 1 °C 1.5 °C

18 k Ω [6.3 °F] [5.4 °F] [4.5 °F] [3.6 °F] [2.7 °F] [1.8 °F] [0.9 °F] [0.9 °F] [1.8 °F] [2.7 °F]

Down Down Down Down Down Down Down

4 °C 3.5 °C 3 ° C 2.5 °C 2 °C 1.5 °C 1 °C 0.5 °C No 0.5 °C 1 °C

33 k Ω [7.2 °F] [6.3 °F] [5.4 °F] [4.5 °F] [3.6 °F] [2.7 °F] [1.8 °F] [0.9 ° F] [0.9 °F] [1.8 °F]

Down Down Down Down Down Down Down Down

4.5 ° C 4 ° C 3.5 ° C 3 ° C 2.5 °C 2 °C 1.5 °C 1 °C 0.5 °C No 0.5 ° C

56 k Ω [8.1 °F] [7.2 °F] [6.3 °F] [5.4 °F] [4.5 °F] [3.6 °F] [2.7 °F] [1.8 ° F] [0.9 °F] [0.9 °F]

Down Down Down Down Down Down Down Down Down

5 °C 4.5 °C 4 ° C 3.5 °C 3 °C 2.5 °C 2 °C 1.5 °C 1 °C 0.5 ° C No

180 k Ω [9 ° F] [8.1 °F] [7.2 °F] [6.3 °F] [5.4 °F] [4.5 °F] [3.6 ° F] [2.7 °F] [1.8 ° F] [0.9 °F]

Down Down Down Down Down Down Down Down Down Down

Temperature compensation at the freezer is performed the same as at the refrigerator. The value for the freezer is twice

►

that of the refrigerator.

This circuit enters the necessary level of temperature compensation for adjusting the appliance. The method is the same

►

for every model in this appliance family.

change

Up Up Up Up Up

change

Up Up Up Up

change

Up Up Up

change

Up Up

change

Up

change

-31-

EXPLANATION FOR MICOM CIRCUIT

2. Compensation circuit for temperature at freezer

Temperature compensation in CUT

JCR1 +1 °C [+1.8 ° F]

JCR2 +1 °C [+1.8 ° F]

JCR3 -1 ° C [-1.8 °F]

JCR4 -1 ° C [-1.8 °F]

+2 ° C [+3.6 °F]

-2 °C [-3.6 °F]

Compensation Compensation

for weak-cold for over-cold

JCR3 JCR4 JCR1 JCR2

CUT +1 ° C [+1.8 ° F]

CUT CUT +2 ° C [+3.6 °F]

CUT CUT CUT +1 °C [+1.8 °F]

CUT CUT CUT CUT 0 ° C [0 °F]

Temperature compensation value

at refrigerator

0 °C (In shipment from factory)

1-TUC °C [-1.8 ° F]

1-TUC °C [-1.8 ° F]

1+TUC °C [+1.8 °F]

2-TUCTUC °C [-3.6 ° F]

0TUCTUC °C [0 ° F]

0TUCTUC °C [0 ° F]

0TUCTUC °C [0 ° F]

0TUCTUC °C [0 ° F]

1-TUCTUCTUC °C [-1.8 ° F]

Remarks

• This circuit allows adjustment of the set temperature for compensation by changing jumpers at locations JCR1~JCR4.

-32-

EXPLANATION FOR MICOM CIRCUIT

Main MICOM LCD(LED)dedicated MICOM

DC 12V

GND

Transmission (error status)

Reception (notch status)

Main PCB L/Wire FD/H(4-wires) Display PCB

1-11. Communication circuit and connection L/Wire between main PCB and display PCB

The following communication circuit is used for exchanging information between the main MICOM of the Main PCB and the
dedicated MICOM of the LED (LCD) Display PCB.

A bi-directional lead wire assembly between the two boards is required for the display to function properly.

Poor communication occurs if a continuous information exchange fail to continue for more than 2 minutes between main
MICOM of main PCB and LCD (LED) dedicated MICOM for LCD (LED) control of display PCB.

°

C

°F

-33-

EXPLANATION FOR MICOM CIRCUIT

2) Sensor resistance characteristics table

Measuring Temperature (°C) Freezing Sensor

-20 ° k 3.22C Ω 77 k Ω

-15 ° k 9.61C Ω 60 k Ω

-15 ° k 0.31C Ω 47.3 k Ω

-5 ° k 1.01C Ω 38.4 k Ω

0 ° k 8.7C Ω 30 k Ω

+5 ° k 2.6C Ω 24.1 k Ω

+10 ° k 9.4C Ω 19.5 k Ω

+15 ° k 9.3C Ω 15.9 k Ω

+20 ° k 1.3C Ω 13 k Ω

+25 ° k 5.2C Ω 11 kΩ

+30 ° k 0.2C Ω 8.9 k Ω

+40 ° k 4.1C Ω 6.2 k Ω

+50 ° k 8.0C Ω 4.3 k Ω

Cold storage sensor 1&2

Frost removal sensor, Outside sensor

Resistance value allowance of sensor is ±5%.

►

When measuring the resistance value of the sensor, allow the temperature of that sensor to stabilize for at least 3 minutes

►

before measuring. This delay is necessary because of the sense speed relationship.
Use a digital tester to measure the resistance. An analog tester has to great a margin of error.

►

Resistance of the cold storage sensor 1 and 2 shall be measured with a digital tester after separating CON8 of the PWB

►

ASSEMBLY and the MAIN part.
Resistance of the freezing sensor shall be measured with a digital tester after separating CON7 of the PWB ASSEMBLY

►

and the MAIN part.

-34-

EXPLANATION FOR MICOM CIRCUIT

-35-

EXPLANATION FOR MICOM CIRCUIT

-36-

EXPLANATION FOR MICOM CIRCUIT

-37-

-38-

EXPLANATION FOR MICOM CIRCUIT

-39-

-40-

-41-

1. Working Principles

1-1. Ice Maker Working Principles

1-2. Dispenser Working Principles

1. This function is available in Models LSC27926**, where water and ice are
available without opening freezer compartment door.

2. “Crushed Ice ” is automatically selected when power is initially applied or reapplied after power cut.

3. When dispenser selection switch is continuously pressed, light is on in the following sequence:
“Water ” “Cube Ice ” “Crushed Ice ”.

4. Lamp is on when dispenser rubber button is pressed and vice versa.

5. When dispenser crushed ice rubber button is pressed, dispenser solenoid and geared motor work so that crushed ice can
be dispensed if there is ice in the ice bank.

6. When dispenser cube ice rubber button is pressed, dispenser solenoid, cube ice solenoid and geared motor work so that
cube ice can be dispensed if there is ice in the ice bank.

7. When dispenser water rubber button is pressed, water valve opens and water is supplied if water valve is normally
installed on the right side of the machine room.

8. Ice and water are not available when freezer door is open.

ICE MAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR

• Level Ice Maker Cube Mould for “ Initial Control”
after power is input.

Power Input

Initial Control

Ice Making Control

Ice Ejection Control

Water Supply Control

Test Control

• Wait until the water in the cube mould is frozen
after ice maker starts operation.

• Check ice bank is full of ice by rotating ice ejection
motor in normal and reverse direction and eject ice into
the ice bank if ice bank is not full.

• This is for refrigerator assembly line and service. When “ice making test switch” is pressed,
it operates in the following steps: initial ice ejection water supply control steps.

• Conduct “Ice Making Control ” after supplying water into the ice maker
cube mould by operating water valve.

-42-

ICE MAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR

2. Function of Ice Maker

2-1. Initial Control Function

1. When power is initially applied or reapplied after power cut, it detects level of ice maker cube mould after completion of
MICOM initialization. The detecting lever moves up and down.

2. The level of ice maker cube mould is judged by output signal, high and low signal, of Hall IC. Make the cube mould to be
horizontal by rotating ice ejection motor in normal or reverse direction so that High/Low signal can be applied to MICOM
Pin No. 42.

3. If there is no change in signals one minute after the geared motor starts to operate, it stops icemaker operation and check
the signal every hour. It resets initialization of icemaker when it becomes normal.

4. It judges that the initial control is completed when it judges the ice maker cube mould is horizontal.

5. Ice ejection conducts for 1 cycle irrespect of ice in the ice bank when power is initially applied.

2-2. Water Supply Control Function

1. This is to supply water into the ice maker cube mould by operating water valve in the machine room when ice ejection
control is completed and ice maker mould is even.

2. The quantity of water supplied is determined by DIP switch and time.

<Water Supply Quantity Table>

LSC27926**

No

1

2

3

4

5

6

7

8

DIP SWITCH SETTING

S1 S2 S3

OFF OFF OFF 6.5 SEC

ON OFF OFF 5.5 SEC

OFF ON OFF 6 SEC

ON ON OFF 7 SEC

OFF OFF ON 7.5 SEC

ON OFF ON 8 SEC

OFF ON ON 9 SEC

ON ON ON 10 SEC

WATER

SUPPLY TIME

* The quantity of water

* DIP switch is on the main

REMARKS

supplied depends on DIP
switch setting conditions
and water pressure as it
is a direct tap water
connection type. (the
water supplied is
generally 80 cc to 120 cc)

PWB.

3. If water supply quantity setting is changed while power is on, water supplies for the amended time. If DIP switch is
changed during water supply, water shall be supplied for the previous setting time. But it will supply for the amended time
from the next supply.

4. When water supply signal is applied to water and ice valves at the same time during water supply, water shall be supplied
to water valve. If water supply signal is applied to ice valve during water supply, water shall be supplied to both water and
ice valves.

2-3. Ice Making Control Function

1. Ice making control is carried out from the completion of water supply to the completion of ice making in the cube mould.

Ice making sensor detects the temperature of cube mould and completes Ice making. (ice making sensor is xed below

ice maker cube mould)

2. Ice making control starts after completion of water supply control or initial control.

3. It is judged that ice making is completed when ice making sensor temperature reaches at -8° C after 100 minutes when
water is supplied to ice maker cube mould.

4. It is judged that ice making is completed when ice maker sensor temperature reaches below -12 ° C after 20 minutes in
condition 3.

-43-

ICE MAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR

Bank is

not full

HALL IC

OUTPUT

SIGNALS

Bank is

full

HALL IC

OUTPUT

SIGNALS

ICE CHECKING

AXIS

ICE CHECKING LEVEL 30 °

Maximum tilting

point

Ice making

(Original point)

Lock

2±1 sec

9±3 sec

8±3 sec

noitcejE ecIgnikcehC ecI

Lock

Horizontal

Conditions

Level Retrun

Conditions

2-4. Ice Ejection Control Function

1. This is to eject ice from ice maker cube mould after ice making is completed.

2. If Hall IC signal is on within 3.6 seconds after ice ejection motor rotates in normal direction, it does not proceed ice
ejection but waits. If the ice bank is full, ice ejection motor rotates in normal direction in every hour to check the condition
of ice bank. If the ice bank is not full, the water supply control starts after completion of ice ejection control. If the ice bank
is full, ice ejection motor rotates in reverse direction and sops under ice making or waiting conditions.

3. If ice bank is not full, ice ejection starts. The cube mould tilts to the maximum and ice is separated from the mould and ice
checking lever raises.

4. Ice ejection motor stops for 1 second if Hall IC signal changes from OFF (low) to ON (high) after 3.6 seconds when ice
ejection motor rotates in normal direction. If there is no change in Hall IC signals within 1 minute after ice ejection motor
operates, ice ejection motor stops as ice ejection motor or hall IC is out of order.

5. If ice ejection motor or Hall IC is abnormal, ice ejection motor rotates in normal direction to exercise initial operation. It
resets the ice maker if ice ejection motor or Hall IC is normal.

6. The mould stops for 1 second at maximum tilted conditions.

7. The mould returns to horizontal conditions as ice ejection motor rotates in reverse direction.

8. When the mould becomes horizontal, the cycle starts to repeat:
Water Supply Ice Making Ice Ejection Mould Returns to Horizontal

-44-

ICE MAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR

2-5 Test Function

1. It is to force the operation during operation test, service, and cleaning. The test switch is mounted under the automatic
ice maker. The test function starts when the test switch is pressed for more than 0.5 second.

2. Test button does not work during ice ejection and water supply. It works when it is in the horizontal conditions. If mould is
full of ice during test function operation, ice ejection control and water supply control do not work.

3. When test switch is pressed for more than 0.5 second in the horizontal conditions, ice ejection starts irrespect of the
mould conditions. Water shall be splashed if test switch is pressed before the water in the mould freezes. Water shall be
supplied while the mould returns to the horizontal conditions after ice ejection. Therefore the problems of ice ejection,
returning to the horizontal conditions, and water supply can be checked by test switch. When test function performs
normally, buzzer sounds and water supply shall carry out. Check it for repair if buzzer does not sound.

4. When water supply is completed, the cycle operates normally as follows: Ice making
horizontal conditions Water supply

5. Remove ice from the ice maker cube mould and press test switch when ice maker cube mould is full of ice as ice ejection
and water supply control do not work when cube mould is full of ice.

Ice ejection

2-6. Other functions relating to freezer compartment door opening

1. When freezer door is open, ice dispenser stops in order to reduce noise and ice drop.

2. When freezer door is open during ice ejection and cube mould returning to horizontal condition, ice ejection and cube
mould level return proceed.

3. When freezer door is open, geared motor and cube ice solenoid immediately stop and duct door solenoid stops after 5
seconds.

4. Water dispenser stops in order to protect water drop when freezer door is open.

5. Test function operates normally irrespect of refrigearator compartment door opening.

Returning to

-45-

ICE MAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR

No

Yes

Yes

Yes

No

No

No

No

Yes

Yes

Is DC Power (5V and 12V)

output normal?

Failed DC Power

• Check DC power (5V, 12V).

Change main PWB

Is cube ice LCD o during

troubleshooting check?

Failed ice making sensor

• Check the resistance of
both ends (1,2) of ice making
sensor of CON9.

• Defects between ice making
sensor and board
(Pin No. 60 of IC1)

Replace Ice making
Sensor

Is Crushed Ice LCD o during

troubleshooting check?

Failed Ice Maker Unit

• Is the resistance of both ends
(9,10) of ice ejection motor of
CON9 between 18 and 22 Ω?

• Is ice ejection motor drive circuit
(IC11 and peripheral circuits)
normal?

• Defects between Hall IC and
Board (Pin No. 42 of IC1).

• Conrm ice ejection and level
return when pressing
test switch.

Replace Ice Maker Unit

Replace Main PWB

Are ice

ejection and level return

normal when test switch is

pressed for more than 0.5 second?

Does the bell

sound once?

Failed ice maker unit test switch

• Are both ends (5,6) of CON9
test switch open?

• Defects between test switch
and board (Pin No. 38 of IC1).

• Are both ends (3,4) of CON9
ice maker stop switch short?

Replace Ice maker Unit

Replace water
supply valve

• Is power applied to water
supply valve?

• Does the water supply
valve work normally?

• Is the water supply line
normally connected?

Poor water supply

Is water suppy normal

after Ice ejection and level return

by ice ejection motor?

Normal

3. Ice Maker Troubleshooting

* Troubleshooting: it is possible to conrm by pressing freezer and refrigerator temperature control buttons for more

than 1 second. (ice maker is normal if all leds are on): refer to trouble diagnposis function in MICOM
function 2-8

-46-

ICE MAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR

4. Ice Maker Circuits

-47-

The above ice maker circuits are applied to LSC27926** and composed of ice maker unit in the freezer and ice maker

driving part of main PWB. Water is supplied to the ice maker cube mould through the solenoid relay for ice valve of

solenoid valve in the machine room by opening valve for the set time. Water supply automatically stops when water

supply time is elapsed. This circuit is to realize the functions such as ice ejection of ice maker cube mould, ice full detection,

leveling, ice making temperature detection, etc. Refer to the temperature detecting circuits of Main PWB for ice making

temperature detection. Ice maker test switch input detection is the same as the door switch input detection circuit of

main PWB.

1. It is to force to operate during operation test, service, and cleaning. The test switch is mounted under the automatic ice
maker. The test function starts when the test switch is pressed for more than 0.5 second.

2. Test button does not work during ice ejection and water supply. It works when it is in the horizontal conditions. If cube
mould is full of ice during test function operation, ice ejection control and water supply control do not work.

3. Ice ejection carries out irrespect of ice formation in the ice making tray if test switch is pressed for more than 0.5 second.
Water shall be splashed if test switch is pressed before the water in the mould is completely frozen. Water shall be
supplied while the mould returns to the horizontal conditions after ice ejection. Therefore the problems of ice ejection,
leveling, and water supply can be checked by test switch. When test function performs normally, buzzer sounds and
water supply shall carry out. Check it for repair if buzzer does not sound.

4. When water supply is completed, normal cycle works: Ice Making Ice Ejection Level Return Water Supply.

5. If ice maker stop switch is set to ON, normal cycle operates: Ice Making Ice Ejection Level Return Water Supply.
If it is set to OFF, ice making conducts but ice ejection, level return, and water supply do not work.

ICE MAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR

- -

48

CIRCUIT

-49-

3854JK1010C

TROUBLE DIAGNOSIS

1. TroubleShooting

KCEHC OT WOH.STNIOP KCEHC DNA SESUAC.SMIALC

1. Faulty start

1) No power at outlet.

2) No power on cord.

Bad connection between adapter and outlet. (faulty adapter)

The Inner diameter of adapter.
The distance between holes.
The distance between terminals.
The thickness of terminal.

Bad connection between plug and adapter (faulty plug).

The distance between pins.
Pin outer diameter.

3) Shorted start circuit.
No power on

power cord.

Disconnected copper wire.

Internal electrical short.

Faulty terminal contact.

Disconnected.

Weak connection.
Short inserted cord length.
Worn out tool blade.

Power cord is disconnected.

Faulty soldering.

Loose contact.

- Large distance between
male terminal.

- Thin female terminal.

Terminal disconnected.

Bad sleeve assembly.

* Measuring instrument:

Multi tester

Check the voltage.
If the voltage is within ±85%
of the rated voltage, it is OK.

Check the terminal
movement.

Check both terminals of
power cord.
Power conducts:OK.
No power conducts:NG

OLP is o.

No electric power on compressor. - Faulty compressor.

Faulty PTC.

4) During defrost.

Capacity of OLP is small.

Characteristics of OLP is bad.

Bad connection.

Power is
disconnected.

Power does not conduct. - Damage.

Bad characteristics. - Initial resistance is big.

Bad connection with
compressor.

Bad terminal connection.

Start automatic defrost.
Cycle was set at defrost when the refrigerator

was produced.

Inner Ni-Cr wire blows out.
Bad internal connection.
Faulty terminal caulking (Cu wire is cut).
Bad soldering.

Too loose.
Assembly is not possible.

Check both terminals of
OLP
If power conducts:OK.
If not:NG.

Check the resistance of both
terminals.
At normal temperature 6:
OK.
If disconnected: ∞.

-50-

TROUBLE DIAGNOSIS

KCEHC OT WOH.STNIOP KCEHC DNA SESUAC.SMIALC

2. No cooling.

2) Refrigeration system is clogged.

Moisture
clogged.

No electric
power on
thermo­stat.

Weld joint
clogged.

Drier clogging.

Residual moisture

in the evaporator.

Residual moisture.

Insucient drier
capacity.

Residual moisture
in pipes.

Moisture penetration - Leave it in the air. - Moisture penetration.
into the refrigeration oil.

Short pipe insert.

Pipe gaps.

Too much solder.

The capillary tube inserted depth. - Too much.

Capillary tube melts. - Over heat.

Clogged with foreign materials.

Reduced cross section by cutting. - Squeezed.

Too large.
Damaged pipes.

Air Blowing.

Leave it in the air.

Caps are missed.

Not dried in the compressor.
Elapsed more than 6 months after drying
Caps are missed.
No pressure when it is open.

Dry drier - Drier temperature.

Leave it in the air.

Caps are missed.

Air blowing.

Not performed.
Too short.
Impossible moisture

conrmation.
Low air pressure.

During rest time.

After work.

Check on package
condition.

Good storage after
nishing.

During transportation.
During work.

Not performed.
Performed.

Too short time.
Low air pressure.
Less dry air.

Desiccant powder.
Weld oxides.
Drier angle.

Heat a clogged evaporator to
check it. As soon as the
cracking sound starts, the
evaporator will begin to
freeze.

The evaporator does not cool
from the beginning
(no evidence of moisture
attached).
The evaporator is the same
as before even heat is
applied.

Foreign material clogging.

Compressor cap is disconnected.
Foreign materials are in the pipe.

-51-

TROUBLE DIAGNOSIS

KCEHC OT WOH.STNIOP KCEHC DNA SESUAC.SMIALC

3. Refrigeration
is weak.

1) Refrigerant Partly leaked.

2) Poor defrosting capacity.

Drain path (pipe) clogged.

Defrost heater does not
generate heat.

Weld joint leak.
Parts leak.

Inject adiabatics into drain
hose.

Foreign materials
penetration.

Cap drain is not disconnected.

Parts
disconnected.

Adiabatics lump input.
Damage by a screw or

clamp.
Other foreign materials input.

Plate
heater

Cord
heater

Inject through the
hole.

Seal with drain.

Wire is cut.

- Heating wire.

- Contact point
between heating
and electric wire.

Dent by n evaporator.
Poor terminal contacts.

Wire is cut.

- Lead wire.

- Heating wire.

- Contact point
between heating and
electric wire.

Heating wire is corroded

- Water penetration.

Bad terminal connection.

Check visually.

Check terminal
Conduction: OK.
No conduction: NG.
If wire is not cut, refer to
resistance.
P=Power
V=Voltage
R=Resistance

2

V

P= —

R

2

V

R= —

P

- -

52

TROUBLE DIAGNOSIS

KCEHCOTWOH.STNIOPKCEHCDNASESUAC.SMIALC

3. Refrigeration
is weak.

Residual
frost.

No automatic defrosting.

Defrost does not return.

Weak heat from heater.

Too short defrosting time. Defrost Sensor.

Structural fault. Gasket gap.

Sheath Heater - rated.

Heater plate

Heater cord-L

- Faulty characteristics.

Seat--(missing, location. thickness) .

Air inow through the fan motor

Bad insulation of case door.

No contact to drain.
Loosened stopper cord.

Not touching the
evaporator pipe.

Location of assembly
(top and middle).

3) Cooling air leak.

Bad gasket adhestion

Door sag.

4) No cooling air circulation.

Faulty fan motor.

Bad adhesion.
Weak binding force at hinge.

Fan motor.

Door switch.

Gap.
Bad attachment.
Contraction.

Self locked.
Wire is cut.
Bad terminal contact.

Faults.

Refrigerator and freezer switch reversed.
Button is not pressed.

Check the fan motor
conduction: OK.
No conduction: NG.

Contact distance.
Button pressure.
Melted contact.
Contact.

Poor door
attachment.
Door liner
(dimension).
Contraction inner
liner.
Misalignment.
Bad terminal
connection.
Adiabatics liquid
leak.

- -

53

TROUBLE DIAGNOSIS

KCEHC OT WOH.STNIOP KCEHC DNA SESUAC.SMIALC

3. Refrigeration
is weak.

4) No cooling air circulation.

Faulty fan motor.

Small cooling air
discharge.

5) Compressor capacity.

Fan is
constrained.

Insucient
motor RPM

Faulty fan.

Shorud. Bent.

Ice and foreign materials on rotating parts.

Fan shroud contact. - Clearance.
Damping evaporator contact.
Accumulated residual frost.

Fan overload. - Fan misuse.
Bad low termperature RPM characteristics.
Rated power misuse.
Low voltage.

Fan misuse.
Bad shape.
Loose connection. - Not tightly connected.
Insert depth.

Rating misuse.
Small capacity.
Low valtage.

6) Refrigerant
too much or too little.

7) Continuous operation

- No contact of temperature controller. - Foreign materials.

8) Damper opens continuously.

Foreign materials
jammed.

Failed sensor. - Position of sensor.
Characteristics

of damper.

9) Food storing place. - Near the outlet of cooling air.

Malfunction of charging cylinder.
Wrong setting of refrigerant.
Insucient compressor. - Faulty compressor.

Adiabatics liquid dump.
The EPS (styrofoam) drip tray has sediment in it.
A screw or other foreign material has fallen into the drip
tray or damper.

Bad characteristics of its own temperatue.
Parts misuse.
Charge of temperature - Impact.

characteristics.

Check visually after
disassembly.

Check visually after
disassembly.

- -

54

TROUBLE DIAGNOSIS

KCEHC OT WOH.STNIOP KCEHC DNA SESUAC.SMIALC

4. Warm
refrigerator
compartment
temperature.

5. No automatic
operation.
(faulty

contacts)

1) Colgged cooling path.

Adiabatics liquid leak.
Foreign materials. –– Adiabatics dump liquid.

2) Food storate.

1) Faulty temperature sensor in freezer or refrigerator compartment.

Faulty contact.
Faulty temperature characteristics.

2) Refrigeration load is too much.

3) Poor insulation.

4) Bad radiation.

5) Refrigerant leak.

6) Inadequate of refrigerant.

7) Weak compressor discharging power.

8) Fan does not work.

9) Button is set at strong .

Store hot food.
Store too much at once.
Door open.
Packages block air ow.

Food.

Frequent opening and closing.
Cool air leak.
Poor door close. – Partly opens.

High ambient temperature.
Space is secluded.

Too much food.
Hot food.

Dierent rating.
Small capacity.

Inspect parts measurements
and check visually.

6. Condensation
and ice
formation.

1) Ice in freeezer compartment.
External air inow. ––Bushing installed incorrectly.

Door opens
but not closes.

Gap around gasket. –– Contraction, distortion, loose, door twisted, corner not

Food vapor. –– Storing hot food. –– Unsealed food.

2) Condensation in the refrigerator compartment.
Door opens
but not closes.

Gasket gap.

3) Condensation on liner foam.
Cool air leak

and transmitted.

Weak door closing power.
Stopper malfunction.
Door sag.
Food hinders door closing.

fully inserted.

Insucient closing.
Door sag.
Food hinders door closing.

Not fully lled.

Flange gap. –– Not sealed.
Gasket gap.

Top table part.
Out plate Ref/Lower part.

- -

55

TROUBLE DIAGNOSIS

KCEHCOTWOH.STNIOPKCEHCDNASESUAC.SMIALC

6. Condensation
and ice
formation.

4) Condensation on door.
Condensation on the duct door. - Duct door heater is cut.
Condensation on the

dispense recess.

Condensation on the Surface.

Condensation
on the gasket
surface.

Water on the oor.

5)
Condensation in the refrigerator compartment.

Defrosted water overows Clogged discharging hose

Discharging hose Evaporation tray located at wrong place.
location.
Tray drip. Damaged.

Position of drain.

Recess Heater is cut.
Duct door is open. / Foreign material clogging.

Not fully lled

Adiabatics liquid contraction.

Bad wing adhesion. Wing sag(lower part).

Door liner shape mismatch.

Corner. Too much notch.

Broken.

Home Bar heater is cut.

Breaks, holes.
Small Capacity.

Liquid shortage.

.remroC.ecafrusrood

Liquid leak.

7. Sounds

1) Compressor compartment operating sounds.
Compressor sound Sound from machine itself.

inserted. Sound from vibration.

Restrainer.
Bushing Too hard.
seat. Distorted.

Aged.
Burnt.

Stopper. Bad Stopper

assembly. (inner

Compressor base not connected.
Bad welding compressor stand(fallen).
Foreign materials in the compressor

compartment.

OLP

sound.

Capacitor noise.
Pipe sound. No vibration damper. amping Bushing-Q.

Chattering
Insulation paper vibration.
Pipe contacts each other. – Narrow interval.

Capillary tube unattached.

sound.

Not t

diameter

of stopper).
Tilted.
Not

Damping Bushing-S.

- -

56

TROUBLE DIAGNOSIS

7. Sounds

1) Compressor compartment operating sounds.
Transformer

Drip tray vibration sound.

Back cover machine sound.

Condenser drain sound.

2) Freezer compartment sounds.
Fan motor sound.

Sounds from fan
contact.

Unbalance fan sounds.

sound.

Its own fault. –– Core gap.
Bad connection. –– Correct screw connection.

Bad assembly.
Distortion.
Foreign materials inside.

Bad connection.
Partly damaged.

Not connected.
Bad pipe caulking.

Normal operating sound.
Vibration sound.

Fan guide contact.
Shroud burr contact.
Damping evaporator contact.
Residual frost contact.

Unbalance.

Aged rubber seat.
Bad torque for assembling motor
bracket.

Damaged heater cord.
Narrow evaporator interval.

Surface machining conditions.
Fan distortion.
Misshappen.
Burr.

KCEHC OT WOH.STNIOP KCEHC DNA SESUAC.SMIALC

Ice on the fan. –– Air intake (opposite to motor

Motor shaft
contact sounds.

Resonance.
Evaporator noise.

3) Bowls and bottles make contact on top shelf.

4) Refrigerator roof contact.

5) Refrigerator side contact.

6) Insucient lubricants on door hinge.

Supporter disorted.
Tilted during motor assembly.

Evaporator pipe contact. –– No damping evaporator.
Sound from refrigerant. –– Stainless steel pipe shape in

Sound from n evaporator and pipe during expansion
and contraction.

bushing assembly.)

accumulator.

- -

57

TROUBLE DIAGNOSIS

KCEHCOTWOH.STNIOPKCEHCDNASESUAC.SMIALC

8. Faulty lamp
(freezer and

refrigerator
compartment).

9. Faulty internal
voltage (short).

1) Lamp problem. Filament blows out.
Glass is broken.

2) Bad lamp assembly. Not inserted.
Loosened by vibration.

3) Bad lamp socket.

Disconnection. Bad soldering.

Bad rivet contact.

Short. Water penetration. Low water

level in tray.

Bad elasticity of contact.
Bad contact(corrosion).

4) Door switch. Defective.

Refrigerator and freezer switches are reversed.
Travlel distance.
Bad connection.
Bad terminal contact.
Adiabatics liquid leak..

1) Lead wire is damaged.

Wire damage when assembling PTC Cover.
Outlet burr in the bottom plate.
Pressed by cord heater. lead wire, evaporator pipe.

2) Exposed terminal.

Compressor Compartment terminal. - Touching other

components.

Freezer compartment terminal. - Touching evaporator pipe.

3) Faulty parts.

Transformer. Coil contacts cover.

Welded terminal parts contact cover.
Compressor. Bad coil insulation.
Plate heater.
Melting fuse. Sealing is broken. Moisture penetration.
Cord heater. Pipe damaged. Moisture penetration.

Bad sealing.
Sheath heater.

Connect conduction and
non-conduction parts and
check with tester.
Conduction: NG.
Resistance ∞: OK.

-58 -

TROUBLE DIAGNOSIS

10. Structure,
appearance,
and others.

1) Door foam.
Sag.

Hinge loose

Weak gasket
adhesion.
Fixed tape.

KCEHC OT WOH.STNIOP KCEHC DNA SESUAC.SMIALC

Bolt is loosened during
transportation.
Not tightly fastened.
Screw worn out .
Adhesion surface.

Not well xed.

Noise during
operation.

Malfunction.

2) Odor.
Temperature of

refrigerator
compartment.

Deodorizer.

Food Storage.

Others.

Hinge interference.

Not closed Interference between door liner and inner liner.
Refrigerator
compartment is
opened when freezer
compartment is
closed (faulty stopper).

High. Faulty damper control.

No deodorizer.
Poor capacity.

Seal condition.
Storage of fragrant foods.
Long term storage.

Odors from cleaners or items which shroud not
be stored in a refrigerator.

Bigger door foam.
Hinge-Pin tilted-Poor atness.
No washer.
No grease.

Stopper worn out.
Bad freezer compartment door
assembly.
No stopper.

Button is set at weak .
Door is open (interference by
food).

- -

59

2. Faults

2-1. Power

TROUBLE DIAGNOSIS

- -

60

s

elbor

P

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. -Reconnect the connecting parts.

and adapter.

Fuse blows out - Short circuit by wrong connection. - Check the fuse with tester - Find and remove the cause of - Replace with ra ted

L

ov wo

-

- Short circuit by insects. (between power cord and products). - Replace with rated fuse.

- Electricity leakage. - Check the resistance of power cord

H -

- Short circuit of components

(tracking due to moisture and dust

atl

oc

penetration).

de

enn

tc

atlo

v hgi

suaCsm

e

u

p eg

ot

h

a stc

dor

gi

er

g

ov h

atl

usiv r

o

e

hC -.e

kc

et

htiw.eg

eh

k

c

Cs

.ylla

p

n

eht

i

rets

tlov

tu

Ω

i fi(

0 si

t

tiw er

a

t

i ,

ohs si

p

r

retset h

.)detr

.xe( melbo

s

a

t

g

lov wol

.)e

s

erusaeM

h

,troh

i

f

,egatlov hg

ps

s

t

i

If fuse blowns out

qer

f

the cause and prevent.

s

krameR

i

noc retfa esu

f

noitac

.

ifice

fnoc ,yltneu

2-2. Compressor

e

lborP

o

C

d ∞

operate.

osserpm

seo

ton

aF -r

ytlu

P

- Compressor is frozen. - If compressor assembly parts are - During forced operation:

s

suaCsm

e

hC -.CT

kce

eual

:

V

normal (capacitor, PTC, OLP), - Operates: Check other parts.

apply power directly to the - Not operate: Replace the frozen

compressor to force operation. compressor with new one, weld,

OLP It starts as soon as it is • Refer to weld repair procedures.

ceh

sk

C

tsi

eh

t

is defective. with new one.

contacted.

na

ec

ser

tsi

Auxiliary winding

Main winding

Power

ser

fI -.

- If it is not innite, it is normal.

- Check other parts.

evacuate, and recharge refrigerant.

s

erusaeM

t

ecalper ,etinifni si ecn

a

i

s

krameR

gnimr

mr

i

2-3. Temperature

TROUBLE DIAGNOSIS

- -

61

elborP

sm

High Poor cool air circulation due to faulty - Lock

t

ni

ht

compartment.

erutare

pme

er

f e

af

n

Faulty fan motor due to faulty door - Iced button (faulty) operation: - Conrm icing causes and repair.

ws

i

suaC

e

- Rotate rotor manually and check

- Wire is cut.

- Fan constraint. – Fan shroud is constrained by shroud

noitarepo hct

- Faulty button pressure and contact:

er

h

k

c

Cs

s

e

Check resistance with a - Replace fan motor.

––

r

.

t.rotom

se

et

0reze

Ω: short.

: cut. - Reconnect and reinsert.

∞Ω

rotation.

- Bad terminal contact: Check - Maintain clearance and remove ice

terminal visually. (Repair and/or replace shroud if fan

contact: Conrm deformation).

visually.

–

Fan icing:

Conrm visually.

ub s

serP.

Press button to check operation.

- Door cannot press door switch - Door sag: x door.

button: Check visually. - Door liner bent:replace door or

hc o

ott

kce

t n

-

peR

attach sheets.

aeM

s

s

u

hctiws rood ecal

.

R

skrame

Bad radiation conditions in - Check the clearance between the - Keep clearance between - The fan may be

compressor compartment. refrigerator and wall (50 mm in refrigerator and walls (minimum broken if cleaning

i

ni

m

- Check dust on the grill in - Remove dust and contaminants refrigerator is on.

compressor compartment. from grill for easy heat radiation.

- Check dust on the condenser coils. - Remove the dust with vacuum

.)mumi

.)mm

05

cleaner from the coils condenser

while the refrigerator is o.

re

p

hw

mrof

s

el

eht

2-4. Cooling

TROUBLE DIAGNOSIS

- -

62

er

h

elborP

sm

High Refrigerant leak. Check sequence Weld the leaking part, recharge the Drier must be replaced.

tarepm

et

ni

ht

oc

eru

e

erf

reze

.

nemtrapm

t

Shortage of refrigerant Check frost formation on the surface - Find out the leaking area, repair Drier must be replaced.

suaC

e

h

C .

1

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).

of evaporator in the freezer evacuate, and recharge the

oc

- 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.

ht

e

k

e

c

r

i

eird

tel

n

i

xua

yrail

apm

k

c

Cs

s

e

g

ap

ew

ded

l

eird

a

elt

n

a

ht ni

u

o d

o

c e

dn

t

r

rosserpm

irfer eht fo str

re

fer.tnemtr

a

r

gi

aeM

s

s

u

.tnare

n

.

t

R

skrame

- -

63

u

e

elborP

m

High Cycle pipe is clogged. Check sequence. - Heat up compressor discharging Direr must be replaced.

et

ht

e

oc

pm

erut

ni

arepm

ez

r

eerf

tra

.tnem

Leak at loop pipe weld joint Check sequence. Replace the compressor, weld, Drier must be replaced.

(discharge) in compressor. 1. Manually check whether evacuate, and recharge refrigerant.

suaCs

ceh

C

k

.1

m

l

aun

a

ti

w

fI

si

If it is not, compressor discharging weld, evacuate, and recharge

joints might be clogged. the refrigerant.

2. Manually check whether hot line - If it's warm, OK. If it's not,

si e

pip

If it is warm, OK. joints might be clogged.

If it is not, condenser outlet weld Disconnect with torch, remove the

joints might be colgged. causes, evacuate, and recharge

condenser is warm, It is not warm

and the frost forms partly on the

evaporator in the freezer

compartment.

e

c

Cs

s

h

k

t

ar

m

et

p

,mr

a

eru

e

.K

O

.mraw

e

snednoc fo

r

oj dlew

R

nedno

c

seal refrigerant.

eM

s

s

er

a

n

nocsi

htiw st

n

i

,

d

s

na

epip eht.yl

e

s

,hcuo

d

t

hc

olc fo sesuac eht evome

h

csid r

a

n

il gn

r

i

g

tce

i

g

.gn

golc eht kce

g

,gni

g

dlew

e

R

TROUBLE DIAGNOSIS

skrame

Faulty cooling fan in the compressor Check sequence. - Replace if motor does not operate.

p

c

o

emtrapm

.tn

2. Check that cooling fan is damage and reassemble it.

k

hC .1

ce

disconnected from the motor.

g

naf

ooc

o

nil

Refer to fan motor disassembly

and assembly sequence.

e

cennocsid si naf fI -.noitare

t

naf k

hc ,d

c

e

2-5. Defrosting failure

TROUBLE DIAGNOSIS

-64-

er

h

elborP

sm

No defrosting Heater does not generate heat as 1. Check the resistance of heater Heating wire is short and wire is cut Seal the

the heating wire is cut or the circuit 0

si

ohs

etr

taeH

)1

2) Lead wire of heater is cut. surface.

3) Heating wire at lead wire contacts 0

1

2

I .

eH

a

gni

sni

gnitre

c si

.tu

Suction tube and discharge orice: 1. Conrm foreign materials. In case 1) Push out impurities by inserting

upmI .

seitir

ec

.

Gap between Suction duct and 1. Conrm in the Suction duct. 1) Turn o the power, conrm

re

talp

ta

Wrong heater rating (or wrong 1. Check heater label. Faults:replace.

.)yl

bmess

suaC

e

Ω: Short. ∞Ω: Cut. •

n

t o

eT.d

t s

h

.

si eriw

h

tni

t o

ecI(

ni

e

deg

amad

e e

pav

e

ht

ehw

otar

o

.r

ag

o

h

Ω: Short. ∞Ω

e

T

t

2. Put hot water into the drain frost is severe.)

.

2

substituting the resistance value Refer to main parts.

into the formula.

P= ––

2

n

eht

hC

kc

e

e

u

g

t

nis

t o

t

h

sn

e

sni

fo.

eci

,

h

uorh

g

(check drains outside). 2) Put in hot water to melt down frost.

ht mr

fnoC

i

2

V

(V: Rated voltage of user country)

R

(R: Resistance of tester[ Ω

Compare P and lavel capacity.

Tolerance: ±7%

k

c

Cs

s

e

Parts replacement: Refer to parts insulation tape and heat

s

d

suo

n

a

siser

t

n

i

la

mr

: Cut.

u

o

nas

h

o

t tr

c e

l

oh

t e

eht

o

ca

ac e

p

Ω

O :

ecna

e

b

dna

sd

Ω: Short.

p

p

.K

t

aeh

e

eni

l re

kcehc

])

a

lpx

e

c

h

u

o

3.

3) Check the water outlet.

4) Push the heater plate to suction

duct manually and assemble the

disconnected parts.

p

mi.)p

u

supply hot water until the ice in the

gap melts down.

2) Push the Heater plate to drain

bottom with hand and assemble

the disconnected parts.

aeM

s

s

u

s.snoitan

w dael neewt

iaperr

ffo nruT( .eriw reppo

m

dna sr

a s

e

itir

ni r

uop

c

n

i d

: ecalper ot woH - retfa yti

toh

n

i e

naht

ero

taw

i re

f

na

ag eht

d

p

,

R

lead wire with

e

but knirh

ca si

eri

c

.r

skrame

uc eht fi

t

e

ot elbiss

-65-

u

e

elborP

m

No defrosting Melting fuse blows. - Check melting fuse with tester. - Faullty parts: parts replacement.

1) Lead wire is cut. If 0

l

a

d

2

1

2

3

ni

os

B )

Ice in the Suction duct. 1. Check the inner duct with mirror. 1) Turn power o.

yb

gnicI )

u

.tc

d

gnic

yb

I )

ht

and bad defrosting due to faulty door, check that motor fan housing and reassemble wrongly

contact and insertion (bad connector operates (If it operates, motor fan assembled parts.

melting, fuse, and motor fan). 2. Disconnect parts in the refrigerator remove the parts and replace it

c

a

o p

g e

y

gnicI )

b

Bad cool air inow and discharge, 1. Turn on power, open or close the 1) Check the faulty connector of

ni

oitres

n

suaCs

Ω gnir

:

O

fI

∞Ω

g

ed

nir

.

n

ng

ierof

oo

ria l

ni

e

ta

h f

a

fo p

eht

g

suo

h ot

i s

iretam

l

a

h

g

wolf

a

.et

lp re

e

h

h f

gni

o

orht

u

al

eta

p r

,re

tae

: wire is cut. resistance with a tester.

2. Check by inserting soft copper 3) Reassemble the heater plate.

wire into the duct (soft and thin

copper not to impair heating wire).

.)K

si

O

compartment, check the connection

around the housing visually,

defrost, and conrm heat generation

on the heater. Do not put hands on

the sheath heater.

3. Check the parts which have faults

described in 1 & 2 (mechanical

model: disconnect thermostat

from the assembly).

e

c

Cs

s

h

k

.K

cehC -

2eht

s

ppu

eht

ht

fI )

e

2

with a new one.

eM

s

s

er

a

oloc

er

r

iw k

dis tnorf eht esiaR )

ro

orf eht t

em

eci

f eht

tlem ,no

or

).gnitsorfed.et

m

ad

str

er

ap

a

eam nehw

e

ood(

.yllarutan tl

I(

ecro

yb ts

f

,dega

TROUBLE DIAGNOSIS

R

u

s

a

,)edis r

tel dna ,sgel edis tn

rewop f

si

d

skrame

2-6. Icing

TROUBLE DIAGNOSIS

-66-

er

h

elborP

sm

Icing in the 1) Bad circulation of cool air. - Check the food is stored properly - Be acquainted with how to use. - Check the defro

refrigerator - Clogged intake port in the (check discharge and intake port - Sealing on connecting parts. related parts if probl

oc

- Damper icing. - Sealing is not good. - Check icing on the surface of

- Pipe icing. - Too much food is stored and clogs bae and cool air path (pipe) after - Check defrost. (After forced

- Discharging the discharge port. dissembling the container box. defrosting, check ice in the

pipe icing. - Bad defrosting. - Check icing at intake ports of evaporator and pipes.)

.

trapm

tnem

- Faulty assembly.

3) Overcooling in the refrigerator - Check refrigerator compartment - Replace faulty parts.

- Faulty damper in the refrigerator pressed on weak

compartment. - Check parts are faulty.

- Faulty MICOM (faulty sensor)

o

girfer

tare

2) Faulty door or refrigerator - Check gasket attached conditions. - Correct the gasket attachment - Replacement should

compartment. - Check door assembly conditions. conditions and replace it. be done when it

ytl

aF -

u

oc

apm

4) Bad defrosting - Check frost on the evaporator - Check parts related to defrosting. -

- Heater wire is cut. after dissembling shroud and fan - Check defrosting. (Check ice on the on the evaporator but

cef

eD -

isor

eD -

f

n

suaC

e

e

n

pmoc r

emtra

t

.t

ksag

e

nemtr

fe

evit

d

yc g

elc

osn

.r

es tsor

o

a.

freezer and refrigerator

compartment.

g

-.

na

g

lc

g

er

ocre

si.t

elo

vo

.ellir

e

kcehC

ci

er d

girf

k

c

Cs

s

e

k

d

.)

hw(

d

t

no

ni

are

c rot

ottu

ne

b

n

).

nemtrapm

o

.t

cehC -

it if it has defects

-

D

e

aeM

s

s

u

p

mad

eht

a re

na rotaropav

e

cal

dn

p

er

mecal

per dna ylbmessa roo

R

i

defrosting

onn

a

t

c.tne

Moisture does not freeze

c).epip d

eb na

s

otaregirferrezeerf fo trop eka

o

c

This interferes with cold

air circulation and

sublimation of the ice.

skrame

st

em

ytl

uaf yb desuac s

.

deriaper eb

eh

t otn

dekcu

i

,

r

ti erehw

s

na sesnedn

eze

.

erf d

5) Customers are not familiar with - Check food interferes with door - Be acquainted with how to use.

.

cam si

ht

o

D -

o

- High temperature, high moisture,

and high load.

enih

s

o r

nep

nis

.g

olc

.s

ec

ehC

-.

no

ht

eci kc

gnili

e

-67-

Problem

Ice in the freezer 1)Bad cooling air circulation -Check food storage conditions -Be acquainted with how to use -Check the parts related

S -

g

- Wall of freezer - Too much food is stored. volume (Less than 75%).

compartment. - Bad defrosting. - Check frost on the evaporator after

discharging port.

B

-

area.

I -

s Cause

compartment. - Intake port is clogged in the freezer visually.(Check clogging at intake - Check defrost (Check ice on the to defro

f

a

o ec

f

fru

.ellir

ria

oC -

lo

)k

eksa

car(t

- Food surface. 2) Bad freezer compartment door - Check gasket attachment -Correct the gasket attachment - Replace when it can n

t ni

gnic

shute. - Faulty assembly - Check door assembly conditions. - Door assembly and replacement.

u

aF -eh

3) Over freezing in the freezer - Refrigerator operates pull down. -Replace defective parts.

c

aF -

nem

pmocna

tra

gni

hcsiD -

gra

g ytl

sa

pmo

ytlu

s

d

dn

a.t

s

p

i tro

ek

nemtra

t

.MOCIM

d

e

C

.

g

gol

e

hC -

c

k

essid

- Check icing at intake port of

irfer

g

noct

ehC(.

- The Temperature of freezer

compartment is satisfactory, but

over freezing happens in the

refrigerator compartment even

though the notch is set at

Check

s Measures

i

p g

r

gr

n

csi

a

h

o

of

t

ar

o

e

.

o

sn

itid

i kc

i f

timretni

t

o

t

no

d

ni oitar

.tn

weak .

puc

c

o d

gnilbm

t

ne

ita

duor

a

hs

oc r

m

e

trapm

tar

e

o si

ep

)ylt

d

orfe

.el

lirg naf dn

a rotaropave).ria gnilooc fo

d

n

n

its

g

.)

tidnoc

er dna snoi

p

o

tfa sepip

f re

i e

cal

e

b.t

Remarks

sting if the

aper

d

b

esuac si melborpdecr

ed

ytluaf eht

r

i

gni

tsor

f

.de

TROUBLE DIAGNOSIS

y

.

ot

4) Bad defrosting. - Check frost on the evaporator after - Check parts related to defrosting.

- Heater wire is cut. dissembling shroud and grille. - Check defrosting. Check ice on the

- Faulty defrost sensor. - Check ice on the intake port in the evaporator and pipes after forced

itsor

feD -

5) User is not familiar with how to - Check food holds door open. - Be acquainted with how to use.

es

u

- Door opens.

- High moisture food water is stored.

yc gn

.

ferelc

C -

ceh

c ro

aregir

t

eht

eci

no

k

.yart

eci

.gnitsorfed.tnemtrapmo

2-7. Sound

TROUBLE DIAGNOSIS

-68-

e

lborP

sm

e

Hiss

sound 1. Loud sound of compressor 1.1 Check the level of the 1) Maintain horizontal level.

itar

o

e

p

2. Pipes resonate sound which is 2.1 Check the level of pipes the point where your tuch reduces

connected to the compressor. connected to the compressor the noise.

3. Fan operation sound in the freezer 3.1 Check fan insertion depth and the structures.

p

c

m

o

a

su

a

C

i

er

r

g

.no

t

nemtr

.

f

1.2 Check the bushing seat are sagged and aged.

conditions (sagging and aging). 3) Touch the piping at various place

and their interference. 4) Avoid pipe interference.

2.2 Check bushing inserting 5) Replace defective fan and fan

conditions in pipes. motor.

2.3 Touch pipes with hands or screw 6) Adjust fan to be in the center of

-driver (check the change of the fan guide.

d

nuo

s

b

dal

3.2 Check the interference with sound.

tcur

t

u

s

3.3 Check fan motor. pipes and suction pipe touch

3.4 Check fan motor bushing freezer shroud.

insertion and aging conditions.

e

c

Cs

s

h

k

o

tare

.r

along its route. Install a damper at

.)

interfering parts and seal gaps in

e

e

g

a

d e

.

am

.ser

R

)

8

bmessa

evaeL )9

u

s

s

er

aeM

ub ecalpeR )2

s

e

l

elc a

a

d

h

a

p eht

tr

ar

na

gni

eht f

taes

y

i

neewteb ecnaraelc a evaeL )7

ka

hcihw s

e

m

opave fi ecn

rot

ar

R

skrame

4. Fan operation sound in the 4.1 Same as fan conrmation in the

compressor compartment. refrigerator.

4.2 Check drip tray leg insertion.

4.3 Check the screw fastening

conditions at condenser and

drip tray.

-69-

u

e

elborP

m

Vibration sound

1. Vibration of shelves and foods in 1-1. Remove and replace the 1) Reassemble the vibrating parts

Clack erehw

5

fer

ht.

e

2. Pipes interference and capillary 1-2. Check light food and container vibration is severe.

tube touching in the compressor. on the shelves. 2) Leave a clearance where parts

compartment. 2-1. Touch pipes in the compressor interfere with each other.

3. Compressor stopper vibration. compartment with hands. 3) Reduce vibration with bushing

4. Moving wheel vibration. 2-2. Check capillary tube touches and restrainer if it is severe.

s

tO .

reh

noi

biv

tar

suaCs

o

aregir

t

utcurt

p dn

a er

stra

1-

3.

4-1. Check vibration of front and rear

5-1. Touch other structures and parts.

evl

s.r

e

h

evo

c

c

ehC .

r

biv

a

moving wheels.

e

c

Cs

s

h

k

ni

s

ab r

c

c k

o

n

oit

fer

eht

.

k

er

pm

aregi

r

s

s

o

r

repp

ots

dnarot

epse(

lpeR )4

eM

s

s

er

a

aof

tresni

oc yllaic

m

oc eca

p

suc ro

m

a ro

sser

pm

o

sser

r

.ylereves setatbiv.

TROUBLE DIAGNOSIS

R

noih

.)epip dn

ti

ppots

fi re

skrame

1. It is caused by heat expansion 1-1 Check time and place of sound 1)

Irregular sound

Click . and contraction of evaporator, sources.

shelves, and pipes in the

refrigerator.

Explain the principles of refrigeration

and that the temperature dierence

between operation and defrosting

can make sounds.

If evaporator pipe contacts with other

2)

structures, leave a clearance between

them (freezer shroud or inner case).

Sound

elborP

sm

Popping

s eht tsomla(

.)dnuos

suaC

e

It happens when refrigerant expands

e

ipac

dn

e eht t

aema

gniyrc slamina sa

l

but

l

fo

yra

er

h

k

c

Cs

s

e

- Check the sound of refrigerant at the - Check the restrainer attached on the

a

o

s

i

t

a

i

t

i.

n

l

n

i

C

kceh

-

s

strat

- Check the restrainer attachment capillary tube again (depth 15±3mm)

conditions on the evaporator and - Fasten the capillary tube to suction

capillary tube weld joints. pipes or detach in the compressor

n

l

ita

l

e

ehw

n

nuos eht

d

f

o

po

a n

itare

eht

r

n

o

ret

f

sorfed

ecr

d

i

t

pave.

o

rotaregirf

stnioj

i ti fI -.g

s

compartment.

- Explain the principles of freezing

cycles.

eM

s

usa

c d

tar

tta dna

llipa

na ro

yra

ser rehtona hca

uounitnoc

es dna

s

TROUBLE DIAGNOSIS

R

lew ebut

d

.reniart

sni ,erevr

tre

skrame

-70-

Water boiing or

It happens when refrigerant passes - Check the sound when compressor is - Explain the principles of freezing cycl

gni

a n

lf

Sound of whistle

lc

o

uos gniwo

n

When door closes, the internal pressure - Check the sound by opening and - Broaden the cap of discharge hose for

when door of the refrigerator decreases sharply closing the refrigerator or freezer doors. defrosting in the compressor

s

iro

.d

i ecif

the pressure dierence between - Check the sound when compressor is internal pressure dierence.

re

dn

sn

o

c

e

t

h

sound.

a

e

girfer

i rota

lumucc

dn

a erehpsomota woleb.se

gn

ika

m ,rotare

ip lanretn

i

otn

a skcu

s

ht

i r

o denrutyb sep

.n

.ffo

denrut.rotaropave dn

accumulator with foam and restrainer.

c

mtrapmo

and inner cases of hinge in door.

wolf tnaregirfer dna

hp

es si dnuos fI -

.tne

rw ,erevr

s

htiw pag eht laeS - eltsihw e

es

non

one

eht pa

yb

em

tuo

neewteb tnalae

2-8. Odor

TROUBLE DIAGNOSIS

-71-

strong

tsuc edausr

u

s

s

er

aeM

.

o

sr

em

e

elborP

sm

Food Odor. Food (garlic, kimchi, etc) - Check the food is not wrapped. - Dry the deodorizer in a sunny place

Plastic Odor. Odors of mixed food and plastic - Check wet food is wrapped with - Clean the refrigerator.

o

.srod

Odor from the Odor from the old deodorizer. - Check the deodorizer odors. - Dry the deodorizer with dryer and

deodorizer.

s

uaC

- Check the shelves or inner with adequate ventilation.

wall are stained with food juice. - Store the food in the closed

- Be sure food is securely covered container instead of vinyl wraps.

with plastic wrap. - Clean the refrigerator and set

- Chedk food cleanliness. button at

al

b cits

p

- It happens in the new refrigerator. plastic bag or wraps with wet food

e

c

Cs

s

h

k

a

l

dna

b

w

o

g

e

-.

P

or odorous foods.

then in the shiny and windy place.

- Remove and replace the

deodorants.

s

krameR

ton

esu o

t

*Deodorizer: option

2-9. Micom

TROUBLE DIAGNOSIS

-72-

esua

elborP

sm

Bad PCB All display Bad connection Bad connector Visual check on connector Reconnect

LCD are o. between Main PCB connection from main connection. connector.

electric power.

my

tp

S

and display circuit. PCB to display PCB.

Defective PCB PCB transformer Check resistance of PCB Replace PCB Applicable to

transformer. winding is cut. transformer input and output transformer or PCB. model without

DefectivePCB electric Defective regulator IC Check voltage at input/output Replace regulator. Refer to electric

ucric

Abnormal Bad connection Lead Wire connecting Check Lead Wire terminals Reconnect Lead

between Main PCB main PCB and display connecting Main PCB and Wire and directly

display LCD

operation and display circuit. PCB is cut or connector display PCB with a tester. connect defective

.stra

p ti

Cmo

s

r

f

a

r

P

t

C

B

temperature fuse is (If resistance is innity, trans

burnt out. winding is cut).

,2

87(

1

PCB electric terminal Check fuse in PCB electric Replace PCB fuse.

fuse is burnt out. terminal with a tester.

STR Parts are Check if STR No. 2 and 3 pins Replace parts. Applicable to

d

egama

et

d

.

b

a

emr

s

o

n

87

5

0

.d

nn

lanimr

oc

e

t

e

t.)

slanimr

imr

c

w t

era

u

kceh

s

C

htiw

neh

o si

rewop

u

saeM

epsid .retset a

c.slan

explanation.

d

om.ff

e

dispenser.

t

tcatnocsi noitce

aeL

d

lanimr

e

.eriW

ot

s

krameRser

r

e

.

s

n

tiucri

ni

tiucric

tiw l

h

Defective LCD. Defective LCD. Check if all LCD are on when Replace display Refer to display

Main PCB Test switch is PCB. circuit in circuit

.

noitanalpx

key and power freezer key are

pressed at the same time for

more than one second.)

rezeerf htob nehw ro( desserp

e

-73-

s

elborP

m

Bad cooling. Freezer Compressor does Compressor Lead Wire Check compressor Lead Wire Reconnect Lead

myS

tp

temperature is not start. is cut. with a tester. Wire.

gih

Defective freezer Defective Freezer Check resistance of freezer Replace freezer Refer to

sensor. sensor parts. sensor with a tester. sensor. resistance

esua

Cmo

s

vit

feD.h

e

Order by model number housing).

and part number.

o

c

c e

driving relay. (3&9) after pressing main PCB and RY2 or PCB. driving circuit in

The wrong sensor Conrm the color of sensor in Repair main PCB explanation.

has been installed. circuits (main PCB sensor sensor housing

kceh

s

C

s

rosserpm

a

eM

v

o

atl

ov eru

iws tset

no hct

si

egatl

CP ta e

g

c

B

.e

I

t

KO si

f

i

e

2NOC

R

u

saeM

alp

R

1YR yaler ec

c

e.lamron

characteristics

table of sensor in

circuit. Refer to

tables on pages

40, 41, and 43.

TROUBLE DIAGNOSIS

s

krameRser

aol ot refe

d

tiucri

nalpx

.noita

Defective freezer fan Fan motor lead wire Check fan motor lead wire Reconnect lead

motor. is cut. with a tester. wire.

• Defective door switch Measure the voltage between

(freezer, refrigerator, PCB power blue line and fan switch

home bar). motor after pressing test switch

• Defective fan motor. of Main PCB. If the voltage is home bar). explanation.

•

Defective fan motor normal, it is OK.

driving relay.

d ytl

aF

fe

ytlu

.tsor

d

R

f

ot r

uaf

efe

ti ts

orfe

• Replace door Refer to load

refrigerator,

• Replace fan motor.

Replace relay RY5

•

& RY6 or PCB.

ort

ni sme

elbu

(freezer,

and circuit

sisongaid

driving circuits in

R

d.snoitcnu

function.

ort ot refe

ngai

siso

elbu

-74-

Problem

Bad cooling

s Sympto

Wrong Defective Step Motor Check Step Motor Check if Step Motor damper Reconnect lead

et

m

Refrigerator Damper. damper motor and motor and reed switch lead wire.

epm

utar

Defective refrigerator Check the resistance of Replace refrigerator Refer to sensor

Defective refrigerator

sensor sensor parts. refrigerator sensor with a tester. sensor. resistance

s

Cause

a

hc

deer.er

wire are cut. Check Refer to Step Motor damper Replace Step Motor

Step Motor damper in parts repair guide.

r

.

a

t

p

Check Step Motor Refer to Step Motor damper Replace relay or Refer to single

damper Motor driving in parts repair guide. PCB. motor damper

y

aler

Foreign materials in Step

Motor damper baes. bae visually. materials.

Ice formation on Check if Step Motor damper Replace Step Motor

Step Motor damper Heater wire is cut with a

baes. tester.

Refrigerator sensor is Check the sensor color in the Repair main PCB

substituted for other circuit. (main PCB sensor sensor housing.

sensor. housing.)

Defective refrigerator Check if refrigerator sensor Fix again the

sensor assembly is not xed at cover sensor but refrigerator sensor.

condition. inner case visually.

n

t

d

iws

C

B

.

ni

P

w dael

Check Step Motor damper Remove foreign

s Measure

Check

tset a htiw tuc era eri

.r

e

damper or refrigerator

noc

damper or refrigerator

control Box Assembly.

TROUBLE DIAGNOSIS

s

lort

bmessA xob

Remarks

.yl

gnivird

in circuit

explanation.

characteristic

table in circuit

explanation.

ucric

sti

-75-

e

s

elborP

m

Bad defrost Defrost is not Defrost lead wire is cut Check if defrost lead wire is cut with a Reconnect lead

ow

Defective Buzzer Defective connecting lead wire from Check lead wire related to door Repair lead wire.

buzzer continuously main PCB to door switch. switch with a tester.

epo

does not work.

mo

myS

tp

.

nikr

g

Defective defrost driving relay. Check the voltage of CON2 (1 and 7) Replace relay (RY 7 Refer to load

Defective defrost sensor parts. Check the resistance of defrost sensor Replace defrost Refer to sensor

rings or door Defective door switch parts. Refer to door switch in parts repair Replace door switch.

a g

nin

su

a

C

t

with a tester after pressing main and RY 3) or PCB. driving conditions

CP

B

f

t

I

w

i

a ht

g mral

u

iws tset

set

.ret

.edi

sk

h

c

Cs

e

riW.retse

c

iwt hct

.e

i ti

ht lamron si egatlov eh

n

e

u

saeM

e

.

.rosnes

TROUBLE DIAGNOSIS

ameR

ser

c

e.KO s

ser

characteristic

table of circuit

explanation.

skr

n

i

kceh

tiucric

o

.

itanalpx

n

ecnatsi

Defective Buzzer does Key input wire is cut or bad connector Check input wire with a tester Reconnect lead Refer to display

er

p

tca

d

ott

alpsi

d

ub y

to

nn

b

dna

u

do not

operate.

nuos

ott

sn

s

la

tnoc

nimret

psid

urt

BCP

yal

Key is continuously depressed due to Disassemble frame display and conrm Adjust or replace

a

r

utc

noc

tni

efre

l

P ni

am ni

tcen

gni

ec

.

ner

dna

BC

dael

eriw

yllausi

.

v

eriw

dna

tcerid.

y

l

contact terminal to

lead wire.

structures.

eca

l

gnirefretni

tiucric ro

i

t

iucric n

.noitanalpxedab tcennoc

-76-

m

sm

e

lborP

Defective Buzzer does Trouble mode indication. Check trouble diagnosis function. Repair troubles Refer to mode

display button. not sound

Buzzer Defective connecting lead wire from Check lead wire associated with door Repair lead wire. Check model

Door Buzzer

Bad water/ice Ice and water

Defective connecting lead wire from Check Lead Wire associated with lever Repair lead wire.

dispenser. are not Main PCB to lever switch. switch with a tester.

p

yS

o

m

t

and buttons

do not operate. explanations.

t

noc

uni

rings or door Defective freezer compartment door Refer to door switch in parts repair Replace Freezer

nin

epo

does not work.

dispensed. Defective lever switch parts Refer to door switch in parts repair guide. Replace lever switch.

mr

ala g

ni

amylsuo

hctiw

s

Defective photo coupler IC parts. Check voltage change at photo coupler Replace photo

psi

d

e

dispenser solenoid).

e

psi

d

dispenser solenoid).

dispense.

dispenser.

ot

B

CP

ap

.str

Defective relay associated with ice Check relay (RY4, RY5, RY12) Replace defective

e

n

g( e

s

Defective parts associated with ice Check resistance of parts with a tester. Replace defective

eg( es

n

Defective relay associated with water Check relay (RY7) with a tester Replace defective

Defective parts associated with water Check resistance of parts with a tester. Replace defective

e

suaC

o

o

d

dera

dera

.

tiws r

h

c

o

tom

otom

,

uc

,r

,r

uc

d

e

na

b

na

,eb

d

.hctiws

.

edi

u

g

output terminals with lever switch coupler IC or PCB.

pressed. It is OK if voltage change is

between 0V - 5V.

i

w

t

.retset a h

sk

h

c

Cs

e

pm

o

c

switch.

.yal

er

.strap

relay.

parts.

erusaeM

s

indication in

function

w

m

n

e

a

tr

rood

t

TROUBLE DIAGNOSIS

kr

ameR

s

esnepsid hti

.r

TROUBLE DIAGNOSIS

3. Cooling Cycle Heavy Repair

3-1. The Heavy Repair Standards for Refrigerator with R134a Refrigerant

NO. Items Unit Standards Purposes Remarks

1 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

10 minutes. Penetration. rainy seasons (the penetration of water

20 minutes.

2 Welding. Nitrogen Weld under To protect - Refet to repair note in each part.

Pressure. Nitrogen oxide scale - R134a refrigerant is more susceptible to

atmosphere formation. leaks than R12 and requires more care
(N

2 pressure: during welding.

0.1~0.2 kg/cm

3 N 2 sealed parts. Conrm N 2 Conrm air leaking To protect - In case of evaporator parts, if it doesn't

leak. sounds when moisture make noise when removing bushing

removing bushing penetration. cap blow dry air or N 2 gas for more than

Sound:usable
No sound:

4

Refrigeration

Cycle. time 40 minutes. moisture.

5 Refrigerant weighing. EA Use R134a Do not mix - Do not weigh the refrigerant at too hot or

6 Drier replacement.

Evacuation

Vacuum Torr Below 0.03(ref) Note:Only applicable to the model

Vacuum EA High and low Vaccum eciency can be improved by

Vacuum EA Use R134a To protect The bushing pipes for R12 refrigerant shall

piping exclusive mixing of be melted when they are used for R134a

Pipe EA Use R134a To protect

coupler cxclusive. R12 Refri-

Outlet R134a exclusive.

(Socket)

Plug R134a exclusive

Min. More than To remove

Pressure sides are operating compressor during evacuation.
evacuated at the
same time for
models above 200

manifold. mineral and refrigerant causes of leak.

exclusively. with R12 too cold an area. (25°C[77°F] is adequate.)
Weighing refrigerant. - Use copper charging canister
allowance:±5g Socket:2SV Plug: 2PV R134a
Note:Winter:-5g Note : Do not burn O-ring (rubber) during

-

Use R134a exclusively

for R134a refrigerator

-

Replace drier whenever
repairing refrigerator
cycle piping.

2

) - Do not apply force to pipes before and

not usable

ester oils.

gerant mixing.

˝

˝

To remove

the moisture

from pipe.

after welding to protect pipe from
cracking.

plate.

.gnidlewg5+:remmuS

.)suoregnad si epip eht otninihtiw:reirD

.strap eht esu nim 1 .pac

tcetorp wolf esrever htiw deppiuqeeerged

water for check. refrigerant Use electronic leak detector if oil leak is

It may be sucked leak area. not found.

into the pipe. -The electronic leak detector is very

sensitive to halogen gas in the air. It also
can detect R141b in urethane. Please
practice, therefore, many times before use.

-77-

.aera kael tnaregirfer ta kael lio kcehC-tceteDypaos esu ton oD-.kcehc kaeL7

TROUBLE DIAGNOSIS

3-2. Summary Of Heavy Repair

Trouble

diagnosis

slooTstnetnoCssecorP

Remove refrigerant

Residuals

Parts

replacement

and welding

Vacuum

Refrigerant

charging and

charging

inlet welding

- Cut charging pipe ends and discharge refrigerant from Filter, side cutters

drier and compressor.

- Use R134a oil and refrigerant for compressor and drier Pipe Cutter, Gas welder, N

- Conrm N

Use good one for welding and assembly.

- Weld under nitrogen gas atmosphere. (N

0.1-0.2kg/cm

- Repair in a clean and dry place.

- Evacuate for more than forty minutes after connecting Vacuum pump R134a

manifold gauge hose and vacuum pump to high (drier) exclusively, Manifold gauge.

and low (compressor refrigerant discharging parts)

pressure sides.

- Evacuation Speed:113 liters/minute.

- Weigh and control the allowance of R134a charging R134a exclusive charging canister

canister in a vacuum conditions to be ±5 g with (mass cylinder), refrigerant

(Charge while compressor operates). electronic scales, pinch-o

- Weld carefully after pinching o the inlet pipe. plier, gas welding machine

2 sealing and packing conditions before use.

2 gas pressure:

2

).

electronic scales and charge through compressor inlet R134a manifold gauge,

2 gas

Check

refrigerant leak

and cooling

capacity

Compressor

compartment

and tools

arrangement

Transportation

and

installation

,rotceteD kaeL cinortcelE.stnioj dlew ta kael kcehC -

Minute leak : Use electronic leak detector Driver (Ruler).

Big leak : Check visually.

Note:Do not use soapy water for check.

- Check cooling capacity

Check radiator manually to see if warm.

Check hot line pipe manually to see if warm.

Check frost formation on the whole surface of the

evaporator.

- Remove ux from the silver weld joints with soft brush Copper brush, Rag, Tool box

or wet rag. Flux may be the cause of corrosion and

leaks.

- Clean R134a exclusive tools and store them in a clean

tool box or in their place.

- Installation should be conducted in accordance with the

standard installation procedure. Leave space of more

than 5 cm (2 inches) from the wall for compressor

compartment cooling fan mounted model.

-78-

TROUBLE DIAGNOSIS

3-3. Precautions During Heavy Repair

snoituacerPsmetI

1. Use of tools. 1) Use special parts and tools for R134a.

2. Recovery of refrigerant. 1) Continue to recover the refrigerant for more than 5 minutes after turning the refrigerator o.

2) Install a piercing type valve on the high pressure line (drier side). Then use the appropriate

recovery equipment to recover the refrigerant from the system. When the refrigerant has

been recovered, install a piercing type valve on the low pressure side. IT IS IMPORTANT

TO OPEN THE SYSTEM IN THIS ORDER TO KEEP THE OIL FROM BEING FORCED OUT.

The use of piercing type valves will allow future servicing and eliminates the possibility of a

defective pinch o.

Evaporator

Hot Line

Compressor

Drier

2

Low pressure side

3. Replacement of drier. 1) Be sure to replace drier with R134a only when repairing pipes and injecting refrigerant.

4. Nitrogen blowing 1) Use pressurized nitrogen to prevent oxidation inside the piping.

welding. (Nitrogen pressure : 0.1~0.2 kg/cm

5. Others. 1) Only nitrogen or R134a should be used when cleaning the inside of piping of the sealed

system.

2) Check leakage with an electronic leakage tester.

3) Be sure to use a pipe cutter when cutting pipes.

4) Be careful not the water let intrude into the inside of the cycle.

Condenser

2

.)

1

High pressure side

-79-

TROUBLE DIAGNOSIS

Compressor

Low pressure side

Condenser

High pressure side

Drier

Evaporator

Release

Refrigent

Intake

Suction

Hot Line

1 2 1

2

Evaporator

Drier

High pressure side

Condenser

Refrigent

Intake

Hot Line

3-4. Practical Work For Heavy Repair

1. Removal of residual

refrigerant.

1) Continue to recover the refrigerant for more than 5 minutes after turning the refrigerator o.

2) Install a piercing type valve on the high pressure line (drier side). Then use the appropriate

recovery equipment to recover the refrigerant from the system. When the refrigerant has

been recovered, install a piercing type valve on the low pressure side. IT IS IMPORTANT

TO OPEN THE SYSTEM IN THIS ORDER TO KEEP THE OIL FROM BEING FORCED OUT.

The use of piercing type valves will allow future servicing and eliminates the possibility of a

defective pinch o.

snoituacerPsmetI

KEY POINT

Observe the sequence for
removal of refrigerant.
(If not, compressor oil may
leak.)

2. Nitrogen blowing

welding.

3. Replacement of drier.

KEY POINT

Welding without nitrogen
blowing produces oxidized
scales inside a pipe, which
aect performance and
reliability of a product.

When replacing a drier:

2

Weld and parts by blowing nitrogen (0.1~0.2kg/cm

assembling a drier.

When replacing a compressor:

Weld and parts by blowing nitrogen to the low pressure side.

Note) For other parts, nitrogen blowing is not necessary because it does not produce oxidized

scales inside pipe because of its short welding time.

Inserting a capillary tube

Measure distance with a ruler and put a mark(12

mark and weld it

+3/-0

) to high pressure side after

KEY POINT

Be sure to check the
inserted length of capillary
tube when it is inserted.
(If inserted too far, the
capillary tube will be
blocked by the lter.)

)on the capillary tube. Insert tube to the

-80-

TROUBLE DIAGNOSIS

snoituacerPsmetI

4. Vacuum degassing.

Evaporator

Drier

2 1

Low

pressure

Blue

Yellow

Compressor

3

Suction pipe

Hot Line

Condenser

Vaccum

Pump

Pipe Connection

Connect the red hose to the high pressure side and the blue hose to the

low pressure side.

Vacuum Sequence

Open valves and and evacuate for 40 minutes. Close valve .

High

pressure

Red

KEY POINT

- If power is applied
during vacuum
degassing, vacuum
degassing shall be
more eective.

- Run the compressor
while charging the
system. It is easier
and works better.

5. Refrigerant charging.

Charging sequence

1) Check the amount of refrigerant supplied to each model after completing vacuum

degassing.

2) Evacuate charging canister with a vacuum pump.

3) Measure the amount of refrigerant charged.

- Measure the weight of an evacuated charging canister with an electronic scale.

- Charge refrigerant into a charging canister and measure the weight. Calculate the weight

of refrigerant charged into the charging canister by subtracting the weight of an

evacuated charging canister.

Indicate the weight of an
evacuated charging canister

R134a

KEY POINT

- Be sure to charge the
refrigerant at around
25°C [77 °F].

- Be sure to keep -5g in
the winer and +5g in
summer.

Calculation of amount of refrigerant charged

the amount of refrigerant charged= weight after charging ­weight before charging (weight of an evacuated cylinder)

-81-

TROUBLE DIAGNOSIS

snoituacerPsmetI

Evaporator

Hot Line

Compressor

Drier

Condenser

Charging Canister

4) Refrigerant Charging

Charge refrigerant while operating a compressor as shown above.

5) Pinch the charging pipe with a pinch-o 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.

6. Gas-leakage test * Test for leaks on the welded or suspicious area with an electronic leakage tester.

7. Pipe arrangement When replacing components, be sure

in each cycle each pipe is replaced in its original

position before closing the cover of the

mechanical area.

Bushing

3-5. Standard Regulations For Heavy Repair

1) Observe the safety precautions for gas handling.

2) Use JIG (or a wet towel) in order to prevent electric wires from burning during welding. (In order to prevent insulation
break and accident.)

3) The inner case will melt and the insulation will burn.

4) The copper piping will oxidize.

5) Do not allow aluminum and copper pipes to touch. (In order to prevent corrosion.)

6) Observe that the inserted length of a capillary tube into a drier should be 12 mm.

Molecular
Sieves

+3

-0

12 mm

7) Make sure that the inner diameter is not distorted while cutting a capillary tube.

8) Be sure that the suction pipe and the lling tube should not be substituted each other during welding. (High eciency
pump.)

Drier

+3

-0

Molecular Pipe

-82-

TROUBLE DIAGNOSIS

3-6. Brazing Reference Drawings

-83-

TROUBLE DIAGNOSIS

4. HOW TO DEAL WITH CLAIMS

4-1. Sound

Hiss sounds Explain general principles of sounds.

• All refrigerators make noises when they run.
The compressor and fan produce sounds.
There is a fan in the freezer compartment which blows cool air to freezer and
refrigerator compartments. Hiss sounds are heard when the air passes through
the narrow holes into the freezer and refrigerator compartments.

Cooling Fan sound in the compressor compartment.

• There is a fan on the back of the refrigerator which cools the compressor
compartment. If there is a small space between the refrigerator and the wall, the
air circulation sounds may be noticeable.

Noise of Compressor.

• This operating sound happens when the compressor compresses the
refrigerant. The compressor rotates at 3600 RPM. The sound of compressor
Bigger refrigerators make more noise than small ones

serusaeM dna skcehCsmelborP

Click sounds Explain the principles of temperature change.

• The sounds happens when pipes and internal evaporator in the refrigerator
compartment expand and contract as the temperature changes during the
refrigerator operation. This sound also happens during defrosting, twice a day,
when the ice on the evaporator melts.

Clunk sound Explain that it comes from the compressor when the refrigerator starts.

• When the refrigerator operates, the piston and motor in the compressor rotate
at 3600 RPM. This sound is caused by the vibration of motor and piston when
they start and nish their operation. This phenomenon can be compared with
that of cars. When an automobile engine starts, it is loud at rst but quiets
down quickly. When the engine stops, so does the vibration.

Vibration sound Check the sound whether it comes from the pipes vibration and friction.

• Insert bushing or leave a space between pipes to avoid the noise.

• Fix the fan blade if it is hitting on the shroud

• Fix the drip tray if it is loosened.

Sound depends on the installation location.

• Sound becomes louder if the refrigerator is installed on a wooden oor or near
a wooden wall. Move it to the another location.

• If the refrigerator is not leveled properly, a small vibration can make a loud
sound. Please adjust the level of the refrigerator.

-84-

TROUBLE DIAGNOSIS

serusaeM dna skcehCsmelborP

Sounds of water owing Explain the ow of refrigerant.

• When the refrigerator stops, the water owing sound happens.
This sound happens when the liquid or vapor refrigerant ows from the
evaporator to compressor.

Click sounds Explain the characteristics of moving parts.

• This noise comes from the MICOM controller's switch on the top of the
refrigerator when it is turned on and o.

Noise of Icemaker operation Explain the procedure and principles of Icemaker operation.
(applicable to model with Icemaker). • Automatic Icemaker 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
ekil sdnuos sekam.nib eci gnittih dna Hiss and water owing also makes sound. When water

- Noise from motor sounds Hiss . freezes, clicking sounds are heard. When ice is being ejected, sounds like Hiss

produced by a motor to rotate an ice tray and ice dropping and hitting ice bin
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 ow 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 owing sound are
heard.

Noise when supplying ice. Explain the principles of ice supply and procedure of crushed icemaking in a

dispenser.

• When ice cube button is pressed, ice stored in the ice bin is moved by an auger
and dispensed. If crushed ice button is pressed, the ice cube is crushed.
When this happens, ice crushing and hitting ice bin sounds are heard.

-85-

TROUBLE DIAGNOSIS

4-2. Measures for Symptoms on Temperature

serusaeM dna skcehCsmelborP

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 sh 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, move it to a refrigerator 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[5 °F]. 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 (especially damp
foods and easily frozen foods) 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.

Do not block the outlet. If the outlet of the cooling air is blocked, the refrigerator
compartment will not be cooled.

-86-

TROUBLE DIAGNOSIS

4-3. Odor and Frost

serusaeM dna skcehCsmelborP

Odor in the refrigerator compartment.

Frost in the freezer compartment Explain the basic principles of frost formation.

Explain the basic principles of food odor.

• Each food has its own particular odor. Therefore it is impossible to prevent or
avoid food odor completely when food is stored in the completely sealed
refrigerator compartment. The deodorizer can absorb some portions of the odor
but not completely. The intensity of odor depends on refrigerator conditions and
environments.

Check the temperature control button and set at strong.

• Clean inside of the refrigerator with detergent and remove moisture. Dry inside
the refrigerator by opening the door for about 3 or 4 hours and then set the
temperature control button at strong .

• The main causes for frosting:

- Door was left open.

- Air penetration through the gasket

- Too frequent door opening. (parties. etc.)

- Hot foods are stored before they are cooled down. The temperature of freezer

is -19 ° C[-2.2 °F]. if temperature is set at MID . If hot air comes into the
refrigerator, ne frost forms as cold air mixes with hot air. If this happens quite
often, much frost forms inside of the refrigerator. If the door is left open in
Summer, ice may form inside of the refrigerator.

Frost in ice tray. Explain basic principles of frost formation.

• When ice tray with full of water is put into a freezer compartment, the water
evaporates. If cool air fan operates, the moisture attached to the jaw (protruded
part) of ice mold will freeze and form frost. If warm water was put into the ice
mold, the situation will become worse.

-87-

TROUBLE DIAGNOSIS

4-5. Others

serusaeM dna skcehCsmelborP

The refrigerator case is hot. Explain the principles of radiator.

• 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. Particularly in summer or after installation of
refrigerator, it may feel hot but it is normal. If there is not enough space to
dissipate heat, it can be hotter due to lack of heat radiation. Please install a
refrigerator in a well-ventilated place and leave the clearance between
refrigerator and wall:

Small holes in a door liner Explain that the hole is for releasing gas.

• A small hole in the door liner is for releasing gas during insulation materials
lining work. With a releasing hole, forming can be easily done .

Electric bills are too much. Explain that the hole is to allow the air to escape when vacuum forming plastic

parts and pumping foam insulation into cavities.
NOTE! Holes and releasing gas appear to be very crude and would not be

acceptable in a manual.
There are small holes in the plastic liner of some parts of the refrigerator. These
holes allow plastic parts to be injection molded and vacuum formed by allowing
air bubbles to be expelled. They also allow foam insulation to be pumped into
cavities where air bubbles may build up.

Condensation on the inside Explain how to store foods
wall of the refrigerator • Condensation forms when refrigerator is installed at damp area, door is
compartment and the cover of frequently opened, and wet foods are not stored in the air tight container or
properly vegetable drawer. wrapped. Be sure to store wet foods in airtight containers or securely covered in

plastic wrap.

When is the power connected? When should the power be connected ?

• You can connect the power immediately after installation. However, if the
refrigerator was laid at before or during installation, you must stand it upright
for 6 hours before plugging it in. This allows the refrigerant oils to return to the
sump in the compressor. If you operate the refrigerator before the oil has had a
chance to settle, you could damage the compressor.

Door does not open properly. Refrigerator compartment door does not open properly.

• When the door is open, warm open air comes into the compartment and is
mixed up with cool air. This mixed air shall be compressed and increase the
internal pressure when door is closed. This causes the door sticked closely to

The front side should

be a little bit higher

than the rear side.

the refrigerator in a moment. (If the refrigerator is used for a long time, it will
open smoothly.)

When the refrigerator compartment door is opened and closed, the freezer
compartment door moves up and down.

• When the refrigerator compartment door is opened and closed, fresh air comes into
the freezer compartment and moves up and down the freezer compartment door.

Door opens too easily.

• There is a magnet in the gasket so it closes securely without a gap. It can be
held open easily if something is in the way and obstructs the door’ s closing.

A door does not close properly.

• If the refrigerator is not properly leveled, the doors will not close easily. Adjust
the level using the leveling screws under the front of the refrigerator.

-88-

HOW TO DISASSEMBLE AND ASSEMBLE

2

1

A

A

B

1

2

1

2

2

Connecting

Line

Earthing

Cord

Hinge Cover

Hinge Lever

A

B

1. DOOR

1) Remove lower cover and then disconnect water

supply tube in the lower part of freezer door.

• Pull the water supply tube forward while pressing on
the coupling as shown in the drawing.

Disconnecting the tube under the door causes about

1.5 litters water to ow out. Please put up a big

!

▲

container to prevent it.

2) Remove a freezer door.

(1) Loosen hinge cover screw of freezer door and remove

cover.
Disconnect all connecting lines except grounding cord.

(3) Disconnect upper hinge from the hinge supporter

by grasping the front part of upper hinge and lifting up
(Hinge Assembly, U) in arrow direction A and pull
forward in arrow B direction. Be careful because the
door may fall, damaging the door, the oor, or injuring
you.

(4) Lift up the freezer door in arrow direction and

disconnect the door from the lower hinge . Don ’t pull
the door forward.

(2) Turn hinge lever in arrow A direction until it is

loosened and take it out in arrow B direction.

Note : • When disconnecting refrigerator door, turn hinge

lever counterclockwise.

• If the hinge or bracket are bent during assembly,
use two extra screws (Tap Tite M6, Left Hinge
attaching screw) in the holes of the upper hinge.

Note : • Lift up the freezer door until a water supply tube is

fully taken out.

(5) Assembly is the reverse order of disassembly

-89-

HOW TO DISASSEMBLE AND ASSEMBLE

2. HANDLE

1. Aluminum short handle Model

1) Grasp the handle by both hands and hold it upward.

-90-

3. FAN SHROUD GRILLE

Bracket, Ice Maker

Hook

Ice Maker Unit

Lever

Tray, Ice

Sensor

Insulation

Cover, Sensor

1) Loosen two screws after disconnecting a cap screw of a
grille fan (U) with a screwdriver balde.

2) Disassembly of a grille fan (U) : Pull forward after
opening hook at part with a screwdriver blade.

3) Disconnect housing A of a grille fan (L) from the main
body.

4) Disassembly of a grille fan (L) : Hold upper part of a
grille fan (L) and pull forward carefully.

5) Loosen two screws.

6) Disassembly of shroud. F (U) : Disconnect housing of B
after removing two rail guides with a screwdriver blade.

7) Disassembly of shroud. F (U) : Hold upper part and pull
forward.

8) Check foam sticking conditions around a shroud, F (U)
and F (L) during assembling. If damaged, torn, or badly
stuck, assemble with a new one after sealing well.

4. ICEMAKER ASSEMBLY

1. Dispenser Model

1) How to disassemble:

(1) Remove ice bank from the freezer compartment.

(2) Loosen two screws on the upper part of icemaker

bracket.

(3) Disconnect icemaker bracket so that it can slide

forward.

(4) Disconnect icemaker housing and sensor housing.

(5) Disconnect icemaker horizontally by pressing bracket

hook part. ( Don ’t disassemble further. The set value
may be changed.)

2) How to assemble : The assembly is the reverse order of
the above disassembly.

Note : When the ice tray is not horizontal after assembly,

assembly must be wrong. Check and assemble
again.

-91-

HOW TO DISASSEMBLE AND ASSEMBLE

Button

Funnel Assembly

Funnel

Assembly

Solenoid Assembly

Cap Assembly,

Duct

Holder

Lever

Spring

Sheet Heater

Dispenser Lever

Solenoid Assembly

5. DISPENSER

1) Disconnect funnel and button assembly by pulling down
and forward.

2) Remove display frame Assembly by making a gap
between a display frame Assembly and Door with a
balde screwdriver and pulling it forward. The cover
dispenser is attached with a hook.

4) Loosen four screws with a phillips screwdriver and pull
the funnel Assembly to disconnect.

5) The Duct Cap Assembly can be disconnected if the hold
lever connecting screw is loosened with a phillips driver.

3) The Display Assembly can be connected by pressing
the top of the dispenser cover and pushing it after
separating the Display Frame from its housing.

6) To install the Duct Cap Assembly, insert one end of the
spring into the right hole of the dispenser lever and
insert the other end into the right hole in the top part of
the dispenser. Then attach the holder at the solenoid
switch.

-92-

HOW TO DISASSEMBLE AND ASSEMBLE

18

21

20

19

7

8

14

17

15

277A

9

10

4

5

2

3

11

6

22

12

13

1

16

7) Dispenser Related Parts

1

FRAME ASSEMBLY, DISPLAY

2 COVER, DISPENSER

3 DECO, FRAME DISPLAY

4

PWB(PCB) ASSEMBLY, DISPLAY

5 BUTTON ASSEMBLY

6 BUTTON DECO

7 FUNNEL ASSEMBLY

8 MICRO SWITCH

9 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

19 DISPENSER LEVER

20 FOAM, NEW

21 RUBBER, CAP

22 DECO, DRAIN

17 Cap Assembly, Duct Detailed Drawings

-93-

#EV#

EXPLODED VIEW

FREEZER DOOR PART

200A

241G

241F

203A

201A

700A

241G

241E

243A

-94-

#EV#

EXPLODED VIEW

REFRIGERATOR DOOR PART

241A

241H

241H

241C

241B

237A

233A

230A

231A

212G

700A

241H

241D

237A

243B

-95-

#EV#

EXPLODED VIEW

FREEZER COMPARTMENT

281A
281C
406A

271B

271A

610E

330B

405G

404A

405D

405A

332A

329A

128D

128D

128F

281G

903E

128C

128C

128E

103C

106A

401A

301A

316B

409A

158C

149A

149B

418A

136A

332B

319B

136B

-96-

#EV#

EXPLODED VIEW

REFRIGERATOR COMPARTMENT

140A

128K

610E

903D

610E

128J

271B

271C

120B

281B

281D
406A

604H

611C

409A

120A

158A

611E

128H

141A

146A

128G

140B

170A

161A

161B

409A

106A

158B

281H

128B

128A

151A

154A

151B

-97-

#EV#

EXPLODED VIEW

ICE & WATER PART

625A

622B

616E

616F

616G

616D

623A

627A

612B

612C

125A

610A

303B

607A

612A

600A

600B

602A

406D

412A

619A

131A

149D

128L

131C

149E

412B

614A

621B

110B

606A

-98-

#EV#

EXPLODED VIEW

MACHINE COMPARTMENT

501F

411A

410G

410H

103A

501A

501K

103B

412D

308A

309A

310A

405C

404B

319E

105A

405F

S15

329C

319A

328A

319C

304A

323B

419A

419B

314A

S38

316A

307A

314A

317A

318A

312A

315A

305B

305C

305C

305B

-99-

#EV#

EXPLODED VIEW

DISPENSER PART

161C

278A

280F

S18

279A

279B

276C

405H

501B

282G

113E

113F

617A

409B

*Only model: LSC27926ST

279B

276C

501B

276B

281F

276A

280A

278G

-100-

280F

279A

276B

281F

276A

280A