LG LKIM08121V /00 User manual

Copyright © 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
REFRIGERATOR
SERVICE MANUAL
MODEL : LKIM08121V /00
GKIM08121V /00
CONFIDENTIAL
Copyright © 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

2 3
Copyright © 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.
CONTENTS
Safety Instructions .............................................................................................................................................. 3
Product Specications ....................................................................................................................................... 6
Installation............................................................................................................................................................ 7
Circuit Diagram ................................................................................................................................................... 9
MICOM Function and Circuit Description ...................................................................................................... 10
Troubleshooting ................................................................................................................................................ 17
Compressor ....................................................................................................................................................... 24
Refrigeration Cycle and Refrigerant................................................................................................................ 26
General Information about the Product........................................................................................................... 32
Handling R600a Refrigerant During Major Repairs........................................................................................ 34
Method for Replacing the Deodorizer.............................................................................................................. 42
Understanding the Characteristics of Each Part............................................................................................ 43
Notes on Disassembling the Product ............................................................................................................. 46
Exploded View and Service Parts List............................................................................................................. 47
SAFETY PRECAUTIONS
Please read the following instructions before servicing your refrigerator.
1. Unplug the power before handling any elctrical components.
2. Check the rated current, voltage, and capacity.
3. Take caution not to get water near any electrical components.
4. Use exact replacement parts.
5. Remove any objects from the top prior to tilting the product.

2 3 Copyright © 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.
Chapter 1 : Safety Instructions
Safety Instructions
Your safety and the safety of others are very important.
We have provided many important safety messages in this manual and on your appliance. Always read and
follow all safety messages.
This is the safety alert symbol.
This symbol alerts you to potential hazards that can kill or injure you and others.
All safety messages will follow the safety alert symbol and either the word WARNING or CAUTION.
These words mean:
WARNING
You may be killed or seriously injured if you do not follow instructions.
CAUTION
You may be injured or cause damage to the product if you do not follow instructions.
All safety messages will tell you what the potential hazard is, tell you how to reduce the chance of injury, and
tell you what may happen if the instructions are not followed.
IMPORT
ANT SAFETY INSTRUCTIONS
WARNING
persons when using this product, follow basic precautions, including the following:
California Safe Drinking Water and Toxic Enforcement Act
ˍThis product contains chemicals known to the State of California to cause cancer and birth defects or other
reproductive harm. Wash hands after handling.
INSTALLATION
ˍTo reduce the risk of injury to persons, adhere to all industry recommended safety procedures including the
use of long-sleeved gloves and safety glasses.
ˍNever attempt to operate this appliance if it is damaged, malfunctioning, partially disassembled, or has
missing or broken parts, including a damaged cord or plug.
ˍOnly connect this product to a dedicated grounded electrical outlet rated for use with this product (115 V, 60
Hz, AC only). It is the user’s responsibility to replace a standard 2-prong wall outlet with a standard 3-prong
wall outlet.
ˍDo not use an outlet that can be turned off with a switch. Do not use an extension cord.
ˍThe appliance must be positioned for easy access to a power source.
ˍWhen moving the refrigerator, be careful not to roll over or damage the power cord.
ˍContact an authorized service center when installing or relocating the refrigerator.
ˍDo not, under any circumstances, cut or remove the third (ground) prong from the power cord.
ˍKeep packing materials out of the reach of children. Packaging material can be dangerous for children.
There is a risk of suffocation.

4 5
Copyright © 2017 LG Electronics Inc. All rights
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Safety Instructions
ˍDo not install the refrigerator in a damp or dusty place where insulation on electrical parts may deteriorate.
ˍDo not place the refrigerator in direct sunlight or expose it to the heat from heating appliances such as
stoves or heaters.
ˍDo not bend or pinch the power cord excessively or place heavy objects on it.
OPERATION
ˍThis appliance is intended to be used in household and similar applications such as
- Staf
- Farm houses and by clients in hotels, motels and other residential type environments;
- Bed and breakfast type environments;
- Catering and similar non-retail applications.
ˍThis product is not to be used for special purposes such as the storage of medicine or test materials or for
use on ships, etc.
ˍDO NOT allow children to climb, stand, or hang on the refrigerator doors or on the shelves in the
refrigerator. They could damage the refrigerator and seriously injure themselves.
ˍDo not allow children to climb into the refrigerator. They could be trapped and suffocated.
ˍChildren should be supervised to ensure that they do not play with the refrigerator.
ˍ
careful closing doors when children are nearby.
ˍDo not touch frozen food or the metal parts in the freezer compartment with wet or damp hands. Doing so
may cause frostbite.
ˍDo not refreeze frozen food that has thawed completely. Doing so may result in a serious health hazard.
ˍf the power
before doing so.
ˍDo not use an adapter plug or plug the power plug into a multi-outlet extension cord.
ˍDo not use a cord that shows cracks or abrasion damage along its length or at either the plug or connector
end. Immediately have all power cords that have become frayed or otherwise damaged repaired or replaced
ˍDo not operate the refrigerator or touch the power cord with wet hands.
ˍDo not modify or extend the power cord.
ˍ
ˍDo not put hands, feet or other objects into the air vents or bottom of the refrigerator. Doing so could result
in personal injury or electric shock.
ˍIn the event of a gas leak (propane/LPG), ensure the area is adequately ventilated and contact an
authorized service center before resuming use. Do not touch the refrigerator or power cord of the
refrigerator.
ˍDisconnect the power cord immediately and contact an authorized service center if there is a strange noise,
odor, or smoke coming from the appliance.
ˍDo not use any fuse (such as copper, steel wire, etc.) other than a standard fuse.
ˍDo not place or use an electrical appliance inside the refrigerator, unless it is of a type recommended by the
manufacturer.
ˍDo not put animals inside the appliance.
ˍ
(such as candles and lamps) on the appliance.
ˍKeep or dispose of the packing materials out of reach of children. Plastic packing materials pose a risk of
suffocation.
ˍIf connected to a circuit protected by fuses, use time delay fuse.

4 5 Copyright © 2017 LG Electronics Inc. All rights
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Safety Instructions
MAINTENANCE
ˍDo not use a hair dryer to dry the inside of the refrigerator.
ˍDo not light a candle to remove odors in the refrigerator.
ˍ. Ensure the area is
adequately ventilated and contact an authorized service center.
ˍ.
ˍUnplug the power plug before cleaning or repairing the refrigerator.
ˍUnplug the power plug immediately in the event of a blackout or thunderstorm.
ˍTurn the power off if water or dust penetrates into the refrigerator. Call a service agent.
ˍDo not store glass containers or soda in the freezer compartment. Contents may expand when frozen,
break the container and cause injury.
ˍ
DISPOSAL
ˍJunked or abandoned refrigerators are dangerous, even if they are sitting for only a few days. When
disposing of the refrigerator, remove the packing materials from the door or take off the doors but leave the
shelves in place so that children may not easily climb inside.
ˍIf
law.
WARNING
ˍKeep ventilation openings, in the appliance enclosure or in the built-in structure, clear of obstruction.
ˍDo not use mechanical devices or other means to accelerate the defrosting process, other than those
recommended by the manufacturer.
ˍDo not damage the refrigerant circuit.
ˍDo not use electrical appliances inside the food storage compartments of the appliance, unless they are of
the type recommended by the manufacturer.
ˍThe refrigerant and insulation blowing gas used in the appliance require special disposal procedures. When
This appliance contains a small amount of isobutane refrigerant (R600a), a natural gas with high
environmental compatibility, but which is also combustible. When transporting and installing the
appliance, care should be taken to ensure that no parts of the refrigerating circuit are damaged.
Refrigerant squirting out of the pipes could ignite or cause an eye injury. If a leak is detected, avoid any
naked flames or potential sources of ignition and air the room in which the appliance is standing for
several minutes.
In order to avoid the creation of a flammable gas air mixture if a leak in the refrigerating circuit occurs,
the size of the room in which the appliance may be sited depends on the amount of refrigerant used.
The room must be 10.8 square feet (1 square meter) in size for every 8g of R600a refrigerant inside
the appliance. The amount of refrigerant in your particular appliance is shown on the identification plate
inside the appliance. Never start up an appliance showing any signs of damage. If in doubt, consult
your dealer.

7
Copyright © 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.
6
Safety Instructions
GROUNDING INSTRUCTIONS
ˍImproper connection of the equipment-grounding conductor can result in a risk of electric shock. Check with
ˍ
ˍNever unplug the appliance by pulling on the power cord.
CAUTION
To reduce the risk of minor or moderate injury to persons, malfunction, or damage
to the product or property when using this product, follow basic precautions,
including the following:
INSTALLATION
ˍDo not install the refrigerator where there may be a danger of the unit falling.
ˍThe refrigerator must be properly installed in accordance with the Installation Instructions.
OPERATION
ˍDo not use aerosols near the refrigerator.
ˍThis appliance is intended to be used only in domestic and similar applications.
ˍDo not strike or apply excessive force to any glass surface. Do not touch glass surfaces if they are cracked
or broken.
ˍ
MAINTENANCE
ˍDo not use strong detergents like wax or thinners for cleaning. Clean with a soft cloth.
ˍRemove foreign objects (such as dust and water) from the prongs of the power plug and contact areas. Do
not use a wet or damp cloth when cleaning the plug.
ˍDo not spray water directly on the inside or outside of the refrigerator.
ˍDo not clean glass shelves or covers with warm water when they are cold. They may break if exposed to
sudden temperature changes.
SAVE THESE INSTRUCTIONS

7Copyright © 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.
7
Product Specifications
Items LKIM08121V, GKIM08121V
Volume
Total available volume 7.6 cu. ft. (219 L)
Left compartment 3.8 cu. ft. (109.5 L)
Right compartment 3.8 cu. ft. (109.5 L)
Dimensions
Height 37 3/8 in. (949 mm)
Width 36 1/4 in. (920 mm)
Depth 27 1/4 in. (691 mm)
Gross weight 137 lb (62 kg)
Power consumption of electric motor
Cooling method Direct Cooling Type
Store / Ferment Electronic type
Insulator CYCLOPENTANE
Fresh vegetables storage -
Kimchi storage container 8EA
Low temperature catalyst deodorization system 2EA
Refrigeration cycle
Compressor BMG089NHMV
evaporator PIPE ON SHEET
Refrigerant 600a(57g)
Refrigerator oil S5HFP(170cc)
Electric parts
specications
PTC -
Overload protection device MRA12091-9201
Fan motor for condenser cooling Φ130, 3BLADE
Left Kimchi Fermentation heater
Right Kimchi Fermentation heater
Protection fuse
CAPACITOR(CS -
Chapter 2: Product Specifications

9
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reserved. Only training and service purposes.
8
Installation Instructions
7
Chapter 3: Installing the Product
3-1. Leveling
■Level the refrigerator first.
(If the floor is uneven, the refrigerator may produce noise.)
▶Level the refrigerator by rotating the leveling legs on the left and right side located at the front.
9

9Copyright © 2017 LG Electronics Inc. All rights
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9
Installation Instructions
3-2. Grounding
1. The product must be manually grounded in the following situations:
1) When used with 110V power supply.
2) When the outlet being used is not grounded, even if the power supply
used is 220V.
2. In places where grounding is difficult, an earth leakage breaker (rated
current 15mA, rated non-operating current 7.5mA) must be installed.
Use an earth leakage breaker with a plug and outlet.
3. Purchase an annealed copper wire with a diameter of 0.063 Inches (1.6
mm) or more or a single core cable with a nominal cross-sectional area of
0.049 Inches (1.25 mm) or more, connect it to the ground terminal on the
back of the refrigerator, and solder it, and bury the copper plate to a depth of 29.53 Inches (750 mm) or more
beneath the surface.
▶Copper plate size: Thickness (0.028 Inches (0.7 mm) or more), surface area (35.43 Inches (900 mm) or
more)
▶Do not connect the ground wire to the following:
1. Water pipe: If there is a plastic part in the pipe, the grounding will not work.
2. Gas pipe: Never use it for grounding as there is a risk of explosion.
3. Telephone line / lightning rod: It is very dangerous as these have high electrical current flows when
lightning strikes.

11
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reserved. Only training and service purposes.
10
Circuit Diagram
9
K227**16E
K227**15E
K227**13E
K227**11E
K222**15E
K222**11E
Chapter 4: Circuit Diagram
LKIM08121V, GKIM08121V
11

11 Copyright © 2017 LG Electronics Inc. All rights
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11
MICOM Function and Circuit Description
Chapter 5: MICOM Function and Circuit Description
5-1 Settings
5-1-1 Control Panel Features
NOTCH Kimchi storage Produce Meat/Fish
Low Middle High
Set Temperature 31°F (-0.7°C) 30°F (-1.2°C) 29°F (-1.7°C) 37°F (2.5°C) 27.5°F (-2.5°C)
1. On initial startup, the refrigerator display is unlocked and the default setting is Kimchi M.
2. If power is restored after a power outage, the refrigerator retains the last settings, with the following
exceptions.If power is lost while the refrigerator is set to the Fer., Fast Chill, or Kimchi+ modes, it defaults to
Kimchi M when power is restored.
3. When the display is locked, the button and other sounds are turned off. If the Lock button is pressed, the lock/
unlock icon blinks 3 times.

13
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12
MICOM Function and Circuit Description
5-1-2. Food Storage / Ferment Mode
(1) When selecting the food type and storage temperature
■LKIM08121V, GKIM08121V
1. To set the refrigerator to “Unlock” status, press the *Lock button for more than three seconds.
2. Pressing the left compartment Kimchi button changes the setting from M→H→L→Storage, and pressing
the right compartment Kimchi button changes the setting from M→H→L
3. When the left compartment Ferment button is pressed, Fer. →Fast Chill is displayed. When the right
compartment Ferment button is pressed, the setting changes from Fer.→Kimchi+.
4. Pressing the left compartment Storage button changes the setting from Produce→meat/Fish.
Pressing the right compartment Storage button changes the setting from Produce→meat/Fish.
5. Pressing the left compartment and right compartment *Power button for more than 3 seconds will display
the Off indicator.
6. Pressing the *Lock button for more than 3 seconds will change the setting to “Lock” Status, which finishes
Food Type and Storage Temperature Selection.
Additionally, if one minute passes with no button being pressed, the refrigerator will automatically enter
“Lock” Status and Food Type and Storage Temperature Selection will end.
5-1-3. When selecting Power ON/OFF Mode
1. To set the refrigerator to “Unlock” status, press the *Lock button for more than three seconds.
2. Pressing the *power button for more than 3 seconds in this state will turn the power OFF.
3. At this time, all of the LED lights for the compartment will turn OFF on the DISPLAY, and the Power LED
will turn ON.
4. Pressing the *Power button for more than 3 seconds in the Power OFF state will turn the Power ON while
restoring the setting to Kimchi M.
5. When the Power is OFF, the heater for the that compartment is turned OFF and the valve is set to CLOSE.
5-1-4. Fermenting Control Pattern FIG.
1. When fermenting kimchi, the control pattern will be different depending on the temperature of the fridge
when the kimchi was first put in and the desired level of fermentation.
2. If the fridge temperature is high when the kimchi is put in during the 1st stage of Fermentation Mode,
Cooling Control is turned on.
3. During Kimchi Fermentation Mode, if the temperature of the kimchi is too cold, the Fermentation Heater
will turn ON. If the temperature of the kimchi is too warm, the Fermentation Heater will turn OFF.
(However, this only applies to the 1st and 2nd stage of Fermentation Mode. )
11
전원 OFF 상태에서 ‘전원’ 버튼을 3초 이상 누르면‘맛지킴김치’,중’으로 복귀되면서 전원이 ON된다.
4.좌칸 보관 버튼을 누르면 야채/과일, 육류/생선, 냉동 순으로 변경되고, 우칸 보관 버튼을 누르면 야채/과일,
육류/생선, (냉동) 순으로 변경된다.
※ 모델에 따라 우칸냉동기능이 없는 모델이 존재함
6.잠금/풀림 버튼을 3초 이상 눌러서 잠금 상태로 변경되면 식품 종류와 보관온도 선택을 종료한다.
또한, 버튼을 누르지 않은 상태로 1분이 경과하면 자동적으로 잠금 상태가 되면서 식품 종류와 보관온도
선택이 종료된다.
※ 모델에 따라 우칸냉동기능이 없는 모델이 존재함
K227**16E, K227**15E, K227**13E, K227**11E, K222**15E, K222**11E
Kimchi sensor temperature Fermentation Heater ON/OFF
Fermentation Heater OFF
18 ℃
(Dongchimi : 10℃)
5 ℃
Fermentation start Fermentation Complete
1.0 ℃
-0.5 ℃
-2.0 ℃
1st
Ferment
2nd
Ferment
3rd
Ferment
4th
Ferment
5th
Ferment
4. If a malfunction such as a sensor error occurs while in Fermentation Mode, the setting automatically
reverts to Kimchi M.
13

13 Copyright © 2017 LG Electronics Inc. All rights
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13
MICOM Function and Circuit Description
5-1-5. Temperature Control Method
1. COMP will be set to ON or OFF and 3 WAY VALVE will be set to OPEN or CLOSE depending on the
sensor temperature of the left and right compartments.
2. If you are unsatisfied with the temperature of only one of the compartments, OPEN only that
compartment's 3 WAY VALVE and turn ON the COMP.
3. If you are unsatisfied with the temperature of both compartments, set COMP to ON and take turns
switching the left and right 2 WAY VALVEs to OPEN and CLOSE.
4. If the temperature lowers during Ripening Mode, the Ripening Heater turns "ON". If the temperature gets
too high, COMP turns "ON", and the 3 WAY VALVE of that compartment becomes "OPEN".
Left Temperature Right Temperature Location of the 3-Way Valve COMP
Satised Satised Note 1) OFF
Satised Dissatised Right Compartment ON
Dissatised Satised Left Compartment ON
Dissatised Dissatised Left 25minutes/Right 25Minutes ON
Note 1) In either the left or right compartment, the 3-Way Valve is "OPEN" in the one with the satisfactory
temperature.
▶Operation Summary CHART of the COMP and 3 WAY VALVE
12
1. C OMP. ON/OFF VALVE OPE N/ CL O
VALVE OPE N O ON
OON OPE N/ CL O
4. "ON" OMP "ON" VALVE "O PE N"
VALVE "O PE N"
�
DI SPLAY
RROR MOD
2. ", " "
3WAY VALVE COMP
※OFF
ON
ON
/
ON
left
compartment
sensor
Unsatisfied with
Temperature
Satisfied with
Temperature
Unsatisfied with
Temperature
Satisfied with
Temperature
OPEN
CLOSE
OPEN
CLOSE
ON
OFF
Right
compartment
sensor
left
compartment
3 WAY VALVE
Right
compartment
3 WAY VALVE
COMP
5-1-6. Buzzer Alert
The front DISPLAY buttons make different sounds when pushed depending on the type and function of the
button.
5-1-7. Power Outage Protection Function
1. After a power outage, even if the power is reset, the previous operations will be performed. (However, this
does not apply to ERROR and TEST MODE states.
2. There is no power outage protection while in Fer. Mode, and settings will return to Kimchi M. (to avoid
excessive fermentation).

15
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14
MICOM Function and Circuit Description
5-1-8. TCM )
℃
5-1-9.
COMP, 3WAY VALVE,
4 min
Immediately
Satisfied
with
Temperature
4 min
7 min
3 sec 3 sec
NOI
Storage temperature
inside refrigerator
During normal operation
season spring
Operation State
When the
temperature
at the left/right
sensor is greater
than 45 ℃
When the
temperature
at the left/right
sensor is
lower than 45 ℃
When returning
from TEST MODE
to a normal state
When initially powering on
Operation Sequence
summer fall winter
Operation in response to ambient temperature
LEFT
All load
OFF
LEFT
COMPARTMENT
FERMENTATION
HEATER
ON
LEFT
COMPARTMENT
FERMENTATION
HEATER
OFF
RIGHT
COMPARTMENT
FERMENTATION
HEATER
ON
Satisfied
with
Temperature
Satisfied
with
Temperature
min
min
min
sec sec sec
sec
RIGHT
COMPARTMENT
FERMENTATION
HEATER
OFF
LEFT
LEFT
5-1-8. TCM COMP forward/reverse rotation control (Restricted to TCM models)
1. After purchase, if the initial power-on and surrounding temperature is higher than 38 ℃, the refrigerator
uses forward rotation control.
2. Otherwise, the refrigerator uses reverse rotation control
5-1-9. Operation in response to ambient temperature
This function maintains a constant storage temperature in all seasons by detecting the surrounding
temperature and compensating for the refrigerator's internal temperature in order to protect against changes
in internal temperature (excessive cooling in winter, weak cooling in summer) due to ambient temperature.
5-1-10. Sequential Operation of Electronic Components
Electronic devices such as COMP, 3 WAY VALVE, the left compartment fermentation heater and the right
compartment fermentation heater run in the following sequence when initially power-up or after TEST has
finished in order to prevent component damage and NOISE emission from a number of components starting
at the same time.
15

15 Copyright © 2017 LG Electronics Inc. All rights
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15
MICOM Function and Circuit Description
• After a VALVE has been open for 3 minutes, the VALVE will OPEN either in the left compartment or right
compartment depending on the internal temperature.
• The above mentioned BLDC stands for the machine room DC BLDC C-Fan Motor
5-1-11. Diagnostic Function
1. The Diagnostic function facilitates service if a failure occurs that affects the performance of the product
during use.
2. When a malfunction occurs, the function will not run even when the button is pushed
3. After a failure has occurred, once "Failure" is cleared from the Error CODE Display, the refrigerator will
return to its normal status
4.The error CODE is displayed as left component 88 Segment, and the remaining LED lights turn off
Error CODE Display

17
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16
MICOM Function and Circuit Description
■LKIM08121V, GKIM08121V
※When a malfunction occurs, for 3 hours* check using All On Mode, and after 3 hours, it will be displayed
as an error code.
* When the left/right compartment kimchi buttons are held simultaneously for more than 1 second
15
K227**16E, K227**15E, K227**13E, K227**11E, K222**15E, K222**11E
NO Malfunction
items
Error
Code
Operating state of the product in
case of failure
Malfunction Content NOTE
COMP
Left 3-
WAY V
ALVE
Right
3-WAY
VALVE
Lefer
menta
on heat
er
Right f
ermen
tation
heater
1Left compartment
sensor malfunction E1 ○
2minut
es
OPEN/
20min
utes
CLOSE
○Heater
Off ○
Left compartme nt
sensor disconnection or
short circuit
Test commection
of each relevant
sensor
2Right compartment
sensor malfunction E2 ○ ○
2minut
es
OPEN/
20min
utes
CLOSE
○Heater
Off
Right compartment
sensor disconnection or
short circuit
3
Open air sensor
malfunction
(location on
DISPLAY)
LED
Off ○○○○○
Ambient Sensor
disconnection or
short circuit
4Communication
malfunction CO ○○○Heater
Off
Heater
Off
When there has
been 30 seconds
continuously
Connector not
inserted.
WIFI communication
unit circuit malfunction
• When a malfunction occurs, the heating function does not run, but the storage function for the left and right
compartments runs.
• If 2 or more defects occur simultaneously, only information about the malfunction detected first will be
displayed.
• When a malfunction occurs and both the DISPLAY's function button and TEST S/W are pressed, the function
is disabled and the buzzer will not sound.
• If a sensor error is detected even during Test Mode function, reset operation.
• When a communications defect occurs, the appliance will revert to the storage temperature set before the
defect occurred.
17

17 Copyright © 2017 LG Electronics Inc. All rights
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17
MICOM Function and Circuit Description
5-1-12 TEST Function
1. The TEST function attempts to identify the malfunctioning part within the PCB and the product's function
CHECK and malfunctioning state.
2. The TEST S/W is in the MAIN PCB board, and any TEST MODE will last a maximum of 2 hours, after
which it will return to a normal state.
3. While running TEST MODE, function buttons are not detected and buzzers do not work.
4. When TEST MODE finishes, make sure to unplug and plug back in the POWER CORD, after which the
appliance will return to a normal state.
5. While running TEST MODE, if a defect is detected such as a sensor problem, TEST MODE is deactivated
and an error code is displayed.
6. While the error code is being displayed, the TEST MODE will not work even if you press the TEST S/W
button.
7. Holding the left compartment kimchi button and right compartment kimchi button simultaneously for more
than 1 second will turn all the LED lights on. The LED display returns to its previous state once the buttons
are released.
MODE Operation Comp /
fan motor Valve
Left/Right com
partment ferme
ntation heater
DISPLAY LED notes
TEST1 Push TEST S/W
1 time
ON Left Compartment
25 minutes /
Right Compartment
25minutes
OFF "11" appears
in the display
below Left Off
when checking the cooling
system of the left /right
compartment
TEST2 During TEST 1,
push TEST S/W
1 time
During TEST 2,
push TEST S/W
1 time
During TEST 3,
push TEST S/W
1 time
During TEST 4,
push TEST S/W
1 time
ON Right Compartment
Valve OPEN
OFF “22" appears
in the display
below Left Off
when checking the cooling
system of the right
compartment
TEST3 ON Left Compartment
Valve OPEN
OFF “33" appears
in the display
below Left Off
when checking the cooling
system of the left
compartment
TEST4 OFF Left Compartment
Valve OPEN
ON “44" appears
in the display
below Left Off
when testing the heater
restore
to
normal
Factory settings are restored when, during TEST4, a maximum of 30 minutes has passed and
each compartment has reached a temperature of 104
°
F (40℃) or more.
※LED CHECK (function)
Holding the left compartment kimchi button and right compartment kimchi button simultaneously for more
than 1 second will turn all the LED lights on. The LED display returns to its previous state once the buttons
are released.

18 19
Copyright © 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.
18
Chapter 6: Troubleshooting Errors
1
2
L-Sensor
CON2
MainPCB
WH
WH
Is E1 shown on the
DISPLAY?
Is the connector connected to
the MAIN PCB inserted
improperly?
Reconnect the
connector
Turn the power off
Tip: For the protection of
MICOM
Separate CON2 from MAIN PCB
and check if the resistance
between pin 1 and pin 2 is as
shown below. (White, White)
Replace
sensor
of the left
compartment
Measuring Points
Pin1 to pin2
PIN1(WH) PIN2(WH)
5 ~ 130kΩ
YES
YES
NO
NO
RESULT
Reconnect CON2 and turn the power on
If F 1 is shown on the DISPLAY,
replace the MAIN PCB, otherwise
explain to the customer.
※Since the connector number and the pin number may vary
depending on the model (PCB), please refer to the pin-specific
function of each connector marked on the PCB.
CON2
Sensor error in the left
compartment
Troubleshooting

18 19 Copyright © 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.
6-2. Troubleshooting Errors
Sensor error in the right
compartment
1
2
R-Sensor
BR
BR
CON3
Main PCB
Is E2 shown on the
DISPLAY?
Is the connector connected to
the MAIN PCB inserted
improperly?
Reconnect the
connector
Turn the power off
Tip: For the protection of
MICOM
Separate CON3 from MAIN PCB
and check if the resistance
between pin 1 and pin 2 is as
shown below. (White, White)
Replace
sensor of the
Right
compartment
Measuring Points
Pin1 to pin2
PIN1(BR) PIN2(BR)
5 ~ 130kΩ
YES
YES
NO
NO
RESULT
Reconnect CON3 and turn the power on
If F 1 is shown on the DISPLAY,
replace the MAIN PCB, otherwise
explain to the customer.
※Since the connector number and the pin number may vary
depending on the model (PCB), please refer to the pin-specific
function of each connector marked on the PCB.
CON3
Troubleshooting

20 21
Copyright © 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.
C-Fan Motor Error
2
1
3
RD
BK
YL
PR
RD(Vs)
BK(GND)
YL(PWM)
PR(F/G)
CON6
Main PCB
4
Joint
Housing C-FAN
Is CF shown on the
DISPLAY?
Is the connector connected to
the MAIN PCB inserted
improperly?
Reconnect
the
connector
Replace
the main
PCB.
Turn off the refrigerator and then turn
it on again. Then after entering TEST
1 MODE, is the voltage between pin
2 and pin 3 as shown below?
Is the machine room fan running
normally in the TEST1 mode?
Is the feedback voltage between
pin 1 and 3 as shown below?
(From the motor to the main PCB)
Explain to the customer.
Check the FAN motor
(Connector, Frost, Jam,
etc.)
YES
NO
YES YES
YES
YES
NO
NO
NO
Measuring Points
Pin2 to pin3 12V
RESULT
Measuring Points
Pin1 to pin3 1 ~ 4 V
RESULT
Check the connection
of HOUSING
Replace the main PCB.
※Since the connector number and the pin number may vary
depending on the model (PCB), please refer to the pin-specific
function of each connector marked on the PCB.
PIN2(RD) PIN3(BK)
PIN1(PR) PIN3(BK)
Troubleshooting