LG LSC27990TT User manual

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REFRIGERATOR
SERVICEMANUAL
CAUTION
PLEASEREADCAREFULLYTHE SAFETYPRECAUTIONSOF THIS MANUAL
BEFORECHECKINGOR OPERATINGTHE REFRIGERATOR.
MODEL : LSC27990TT COLOR :TITANIUM

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 ................................................................................................................................................................ 9
EXPLANATION OF MICOM CIRCUIT ................................................................................................................................... 22
EXPLANATION OF PWB CIRCUIT ..................................................................................................................................... 22
PWB PARTS DIAGRAM AND LIST ..................................................................................................................................... 37
PWB CIRCUIT DIAGRAM ................................................................................................................................................... 43
ICEMAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR ............................................................................ 45
WORKING PRINCIPLES .................................................................................................................................................... 45
FUNCTION OF ICEMAKER ............................................................................................................................................... 46
CIRCUIT ................................................................................................................................................................................ 48
TROUBLE DIAGNOSIS ........................................................................................................................................................ 49
TROUBLESHOOTING ....................................................................................................................................................... 49
FAULTS .............................................................................................................................................................................. 59
COOLING CYCLE HEAVY REPAIR ................................................................................................................................... 76
HOW TO DEAL WITH CLAIMS .......................................................................................................................................... 83
TV-RADIO ............................................................................................................................................................................. 88
SAFETY PRECAUTIONS ................................................................................................................................................... 88
FEATURE ........................................................................................................................................................................... 88
CONTROLS ........................................................................................................................................................................ 89
REMOTE CONTROL KEY FUNCTIONS ........................................................................................................................... 90
TROUBLESHOOTING ....................................................................................................................................................... 91
BLOCK DIAGRAM .............................................................................................................................................................. 92
TV PART DISASSEMBLE .................................................................................................................................................. 93
HOW TO DISASSEMBLE AND ASSEMBLE ....................................................................................................................... 94
DOOR ................................................................................................................................................................................. 94
HANDLE ............................................................................................................................................................................. 95
FAN SHROUD GRILLE ...................................................................................................................................................... 95
WATER VALVE DISASSEMBLY METHOD ......................................................................................................................... 96
FAN and FAN MOTOR DISASSEMBLY METHOD .............................................................................................................. 96
DISPENSER ....................................................................................................................................................................... 97
EXPLODED VIEW ................................................................................................................................................................ 99
REPLACE PARTS LIST ....................................................................................................................................................... 106
-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 the power
cord from wall outlet and wait for more than three
minutes before replacing PWB parts. Shut off the power
whenever replacing and repairing electric components.
2. When connecting the power cord, please wait for more
than five minutes after the power cord was disconnected
from the wall outlet.
3. Check if the power cord is pinched between the
refrigerator and the wall. If the plug or cord is damaged,
it could cause a fire or an electric shock
4. If the wall outlet is overloaded, it may cause a fire. Use a
dedicated circuit for the refrigerator.
5. Make sure the outlet is properly grounded.
Particularly in a wet or damp area.
6. Use standard electrical components.
7.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. Check for evidence of moisture intrusion in the
electrical components. Replace the parts or mask with
insulation tape if moisture intrusion was confirmed.
10. Do not insert fingers or tools into the icemaker. The
geared motor drive could cause an injury or damage to
tools or the icemaker.
11. De not suggest that customers repair their refrigerator
themselves. This work requires special tools and
knowledge. Non-professionals could cause fire, injury,
or damage to the product.
12. Do not store flammable materials such as ether,
benzene, alcohol, chemicals, or gas.
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.
16. This is a consumer grade product. It is not intended for
precise storage of medication.
-3-

SPECIFICATIONS
1. Ref No. : GR-G277STSA(LSC27990TT)
ITEMS
DIMENSIONS
WxDxH
NET WEIGHT
COOLING SYSTEM
TEMPERATURE CONTROL
DEFROSTING SYSTEM
INSULATION
COMPRESSOR
EVAPORATOR
CONDENSER
REFRIGERANT
LUBRICATING OIL
SPECIFICATIONS
908x 896 x 1771mm
(3511/16x355h6x69W16in.)
145kg (319.7 Ibs.)
Fan Cooling
Micom Control
Full Automatic
Heater Defrost
Cyclo-Pentane
PTC Starting Type
Fin Tube Type
Wire Condenser
R134a (185g) (61/2oz.)
FREOL @10G (320 cc)
ITEMS
DRIER
CAPILLARY TUBE
FIRST DEFROST
DEFROST CYCLE
DEFROSTING DEVICE
ANTI-SWEAT HEATER
ANTI-FREEZING HEATER
FREEZER LAMP
REFRIGERATOR LAMP
DISPENSER LAMP
SPECIFICATIONS
MOLECULAR SIEVE XH-7
ID a0.83
4 - 5 Hours
13 - 15 Hours
Heater, Sheath
Dispenser DuctDoor Heater
Dispenser Heater
Water Tank Heater
Damper Heater
40W (1 EA)
40W (4 EA)
15W (1 EA)
t-
_o
Ob
{O
vE
E
F--
I,,.,.
I
t- t-
_o _o
E E
E E
i.q i.q
•r- ,r-
_c
k
,r-
1004 mm (391/2 in.) .
908 mm (3911/16 in.)
co
LO LO
o oJ
CO CO
v v
E E
E E
Ob Ob
I_ o4
I',--. (3o
L
c c
LO CO
Lo Ob
LO
E E
E E
Front View Top View
-4-

PARTS IDENTIFICATION
1. Ref No. : GR-G277STSA(LSC27990TT)
PWB Cover
\\\,_
Frame Display
Dis
Ice &
Dispenser Button
L_ ............. '}i!l]J!iili
c? _ ===
Water Tubes
/.- /
Automatic
Icemaker
Freezer
Compartment Refrigerator Compartment Dairy Product Corner
Water Filter
Lamp
Shelf
Lamp
Shelf
Drawer
Door Rack
Drawer
Door Rack
Shelf
Snack Drawer
-- Door Rack
Lamp
Bottle Guide
Vegetable Drawer
OptiFresh
Door Rack
Lower Cover ...............................................................-// OptiFresh Display Humidity Switch
-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:
i I
I
t
IScrew
I
\\ Driver
Insert a driver _ into the groove Oof the adjusting
screw and turn in the direction of the arrow (clockwise)
until the refrigerator is level.
Insert a driver _ into the groove O if the adjusting screw
and turn in the direction of the arrow (clockwise) until the
refrigerator is level.
3) When the refrigerator door is lower than the freezer door
Adjust the level when the refrigerator door is lower than the
freezer door during
the use of the refrigerator.
(1) Using the wide side of the tool for adjustment O, turn the
keeper nut O('_'_) clockwise to loosen the keeper nut.
(2) Using the narrow side of the tool for adjustment, turn the
adjustment hinge pin _ (,_,_) clockwise or (_V')
counterclockwise to level the refrigerator and freezer door.
(3) After setting the level of the door, turn the keeper nut (_v)
counterclockwise to tighten.
Caution : Do not force too hard to level the height. The hinge
pin can be pulled out (Adjustable range of height:
Maximum of 2/10 " (5 mm)).
i O Keeper nut
(2_Adjustment
hi_ _ge pin
,'a)Tool for
adjustment
Up
!>J
-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.
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.
After changing the water filter cartridge, reset the water
filter status display and indicator light by pressing and
holding the FILTER Button for 3 seconds. (page 13)
1) Remove the old cartridge.
Twist the knob of the cartridge counterclockwise.
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.
LG MDL PART NO MAKER
GR-G277STSA 5231JA2006A CUNO
(LSC27990TT)
-7-

HOW TO INSTALL REFRIGERATOR
3. How to Control the Amount of Water Supplied to Icemaker.
3-1. Confirm the amount of water supplied to the icemaker.
1) Confirm the amount of water supplied to the icemaker
(1) Press the button (Figure 1) to selsct the level of water (Optimum level --* Large -=, Small.)
2) Icemaker Operation Test (Test mode)
(1) Press the button (Figure 1) for more than 3 seconds and It will start the Test mode.
(2) Test the operation of the operating part of the icemaker.
(3) If there is no problem with the operation, water is supplied through the water tube (up to the
selected lebel of water).
(4) The test mode is completed after the water is supplied.
Note : When using the test mode more than twice consecutively, water can overflow.
When the water overflows, wipe the ice storage bin.
Check water level
Water Amount
Indicator Light
_po Feeler
wer Arm
1.........// Water Amount Switch
Selection Button
Figure 1.
* It is acceptable if the adjusted level of water is a bit smaller than optimum level.
-8-

MICOM FUNCTION
1. Monitor Panel
1-1. GR-G277STSA(LSC27990TT)
Temperature Adjust Button -Calendar &
oe OSe,ect,oo u, ooJ/ Dispenser Selection Button ' I'
Lock Button Door Alarm Button
Dispenser Light Button
-9-

MICOM FUNCTION
1-2. Display Second Function
LCD Check Mode
Demo Mode
ICommunication Data Check Mode Door Alarm Buzzer
Mute Mode
1. Door Alarm Buzzer Mute Mode
Press _))) _ button to the buzzer on or off.
2. Demo Mode
Demo mode is available for displaying the refrigerator in a sales setting or similar condition.
It allows the display, dispenser, lights, and fan to operate without running the compressor.
To enter the DEMO mode, press and hold the TEMPERATURE and _ I_ button simultaneously for 5 seconds until the
Ding- sounds in the lock status.
To exit the DEMO mode and return to normal operation, press and hold the TEMPERATURE and _ I_1 button
simultaneously for 5 seconds until the Ding- sounds again in the lock status.
The refrigerator will default to the NORMAL mode (DEMO mode OFF) if the power fails.
2. LCD Check Mode
Press TEMPERATURE and I_)))_, button simultaneously for 1 second in the lock status.
4. Communication Data Check Mode
Press MENU and -',0_ button simultaneously for 6 seconds in the lock status.
-10-

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 COLD COLDER COLDEST COOL COOLER
Control
Freezer Control -2 °F -5 °F -8 °F 7 °F 1 °F
Refrigeration 37 °F 34 °F 32 °F 46 °F 41 °F
Control
*The telnperature can vary ±5'>F(±3°C) depending on the load condition.
Whenever pressing button, setting is repeated in the order of COLD _ COLDER -_ COLDEST -_ COOL -_ COLDER.
• 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 COLDER unconcerned with display Notch during Icemaking Control Mode and Icemaker Stop
switch is selected with ON.
2-1-2. Outside temperature display function
1. The ambient temperature sensor is located under the upper right hinge cover. This sensor reads the
temperature of the room and displays it in the upper right corner of the display.
2. The ambient temperature is displayed between 16 °F and 120 °F. Outside of that range, the display will
show Er.
3. Since the ambient temperature sensor is located at the hinge, its reading may differ from other
thermometers in the room.
-11 -

MICOM FUNCTION
2-1-3. Lock function
1. If desiring to lock the dislay the dispenser and control panel, push on _ _ button more than 3 seconds.
Lock icon is appeared at the right of display with lock status.
2. 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.
3. If desiring to release the lock status and pressing the lock button more than 3 seconds. Lock icon is disappeared at the
right of display with the lock release status.
2-1-4. Filter condition display function
1. There is a replacement indicator light for the water filter cartridge on the dispenser.
2. Water filter needs replacement once six months.
3. You will see a reminder pop-up window in the LCD screen 2 weeks before /1 week before /due date to replace the filter
to notify you that the filter needs to be replaced.
4. If you want to reset the filter,use the Menu *Refrigerator _Filter Reset menu.
-12-

MICOM FUNCTION
2-2. Dispenser use selection
You can select water or ice.
=_:Select WATER, CRUSHED ICE, or CUBED ICE by pressing the DISPENSER button as you desire.
=_:Use your cup to press lightly on the actuator.
• Each graphic is indicated for the selected function.
• You'll hear a CLICK when the ice door closes 5 seconds after ice is dispensed.
REFERENCE : Hold your cup in the dispenser for a few seconds after dispensing
ice or water to catch the last few drops or pieces of ice.
2-3. ICE PLUS Freezing
Select this function to expedite freezing.
• Turn on/off the IcePlus function using the IcePlus button within the Temperature function.
Pressing [
Switch /
• H =l
The IcePlus icon remains at the ON status after animation when selecting Special Refrigeration IcePlus FRZ
• ICE PLUS freezer function automatically turns off after a set time.
<ON> <OFF>
2-4. Dispenser Light
• The dispenser lightfunction is repeated following below whenever pressing button.
-13-

MICOM FUNCTION
2-5. ICE PLUS freezing
1. ICE PLUS freezing is a function to increase the cooling speed of the freezer compartment by running both the
compressor and the fan simultaneously.
2. ICE PLUS is cancelled and the refrigerator returns to its default setting in the event of a power interruption.
3. Selecting ICE PLUS changes only the speed of the cooling without affecting the set temperature.
4. The temperature can be adjusted even when ICE PLUS has been selected and is in progress.
5. The freezer operates at whatever temperature was set at the time ICE PLUS was selected.
6. If you select ICE PLUS, the compressor and fan will run until it is deselected or the cycle time has elapsed.
(3 hours : compressor and fan run /3 - 24 hours : COLDEST operation)
7. If a defrost cycle occurs while an ICE PLUS is already running, ICE PLUS runs for its remaining cycle time after the
defrost cycle is completed. If the defrost cycle takes longer than 30 minutes, ICE PLUS will run for only 2 hours at the end
of the defrost cycle.
8. If you press ICE PLUS during a defrost cycle, the ICE PLUS indicator will illuminate but the compressor will not operate
until the defrost cycle is complete.
9. If you press ICE PLUS within 7 minutes of compressor cut-off, the compressor will not operate until the 7-minute delay
has passed.
10. The freezer fan motor runs at high speed during the ICE PLUS cycle.
2-6. OptiFresh Function
1. The OptiFresh bin is positioned at the bottom of the refrigerator compartment and has a separate temperature control to
allow perfect storage of fruits and vegetables.
2. OptiFresh comprises of OptiFresh sensor at the rear of OptiFresh and a damper between OptiFresh and Freezer
compartment and a temperature adjusting display at the top of it.
3. When powered on, the initial NOTCH of OptiFresh display will be on OptiFresh Crisper.
If only the refrigerator door is opened, the OptiFresh LED will be ON.
4. The OptiFresh sensor opens and closes the damper based on the temperature.
5. The OptiFresh damper will cycle every hour to prevent icing up.
Activate
• Press the button to toggle between ON and OFF.
-14-

MICOM FUNCTION
2-7. Control of variable type freezing fan
1. To increase cooling speed and response to load, the MICOM will vary the speed of the freezer fan between low and high.
2. The MICOM runs the fan at high speed only at power-up and for ICE PLUS cycles, and runs at low speed for all other
settings.
3. If you open the freezer door, the refrigerator door, or the home bar door, and the freezer fan was running at high speed, it
will reduce to low speed. If it was running at low speed when a door was opened, it will turn off.
4. If the MICOM determines the BLDC fan motor is locked up, (no signal for 115 seconds) it will show a failure code on the
display and cut power to the fan. To power the fan again, unplug the refrigerator for a few seconds and plug it in again.
2-8. Control of cooling fan motor
1. The cooling fan motor performs ON/OFF control by linking with the COMPRESSOR.
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).
2-9. Door opening alarm
1. The buzzer sounds when any door is held open for more than one minute.
2. After any door has been open for one minute, the buzzer sounds three times for ½ second each, then it sounds three
times for ½ second each every thirty seconds until the door is closed.
3. When all open doors have been closed, the buzzer stops.
Doors of freezer, I 1 Jrefrigerator, or Closing Opening Closing Opening
home bar. Closing
3Times3Times3Times3Times
BUZZER
!Lessthan! One minute _ 30 _ 30 _ 30
one minute secondssecondsseconds
2-10. Ringing of button selection buzzer
1. If pressing the front display button, Ding - sound rings.
-15-

MICOM FUNCTION
2-11. Ringing of manual operation, manual frost defrost buzzer
1. The buzzer sounds briefly when the test button on the main PCB is pressed.
2. If you select manual operation, the buzzer sounds three times for 2/lOsecond each, then it sounds three times for 2/10
second each every thirty seconds until the door is closed.
3. If you select manual defrost, the buzzer sounds three times for 2/lOsecond each, then it sounds three times for 2/lOsecond
each every thirty seconds until the door is closed.
2-12. Defrost function
1. Defrost is cycled whenever the compressor's runtime reaches 7 - 7 ½ hours.
2. In providing initial power (or returning power failure), defrost starts whenever total operation time of compressor becomes
4 - 4 ½ hour.
3. Defrost 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 defrost cycle is run if the defrost sensor fails.
2-13. Refrigerator room lamp automatic 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.
-16-

MICOM FUNCTION
2-14. Sequential operation of components
Component 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 many
parts in applying initial power and completing test.
Function Load Operation Sequence Remark
Whentemperature
ofa frostremoval
sensorbecomes
more than45°C
(At purchase,
shipping)
When
_ temperature of a
frost removal
sensor becomes
_=.: less than 45°C
(In power failure,
-a service)
(1:)
Testmode 1
(Manualfunction)
.-I
n3
03
'--I
0 Testmode2
m(Manual frost
removal)
POWER 0.3
sec.
ON
COMP
ON
0.3 F-FAN
sec. &
---*- C-FAN
ON
0.3 R-STEP
sec. MOTOR
DAMPER
ON
OPTICMILL
0.3 STEP
sec.
-_ DAMPER
MOTOR
ON
0.3 FROST 0.3 FROST
POWER sec. REMOVAL sec. REMOVAL
HEATER_HEATER
ON ON OFF
6.0
sec. DAMPER0.3 DAMPER
&sec. &
)DUCTDOOR-_ DUCTDOOR--
&OPTICHILL &OPTICHILL
HEATERON HEATEROFF
0.3 PIPE 0.3 PIPE 0.3 0.3 F-FAN O.3 O.30PTICHILL
•c & sec. & sec. COMP sec. sec. R-STEP sec. STEP
-_ DISP' ---_ DISP' ---*- _ & -_ MOTOR ---_ DAMPER
HEATER HEATER ON C-FAN DAMPER MOTOR
ON OFF ON ON ON
TEST
SWITCH
(PRESS -_
Onc_
OPTICHILL
OTHER 0.3 COMP 0.3 F-FAN 0.3 R-STEP 0.3 STEP
LOAD sec. sec. &sec. MOTOR sec. DAMPER
---_ _C-FAN ---_ DAMPER---_ MOTOR
OFF ON ON ON CLOSE
TEST COMP
SWITCH
(PRESS -_ OFF
2Times)
0.3 F-FAN 0.3 FROST 0.3 R-STEP
sec. & sec. REMOVAL sec. MOTOR
--_ C-FAN --_ HEATER-_ DAMPER
OFF ON CLOSE
Iferror occurs
during operation,
initial operation is
not done.
•Sequence of
load operation
when closing
FREEZER and
REFRIGER-
ATOR.
If you press the
switch in the
againtest mode 2
or temperature of
afrost removal
sensor is more
than5°C, it
immediately
returns tothe test
mode for initial
operation
(COMPRESSOR
operates after 7
minutes).
-17-

MICOM FUNCTION
2-15. Failure Diagnosis Function
1. Failure diagnosis facilitates service when a failure code shows during product operation.
2. When a failure is detected, the buttons are deactivated.
3. If a failure code is released, the MICOM resets and normal operation continues.
4. The failure code is displayed on the display screen. All display graphics that are not part of the failure code are turned off
(1) GR-G277STSA(LSC27990TT)
NO
1 ABNORMAL
FREEZER SENSOR
ABNORMAL£EFRIGERATOF
SENSORI(RI/
2 UPPER PART IN THE
REFRIGERATOR
COMPARTMENT_
ABNORMALREFRIGERATOR
SENSOR2(R2)
3LOWER PART IN THE
REFRIGERATOR
COMPARTMENT)
4 ABNORMAL
DEFROST SENSOR
ITEM
5 FAILEO BEFROSTING
6 ABNORMALFREEZING
BLOC MOTOR
7 ABNORMALCOOLING
BLBC MOTOR
FAILURE CODE
INDICATION PART
FREEZERROOMNOTCH REFRIGERATORROOMNOTC
TEMPERATUREDISPLAY TEMPERAqJREDISPLAY
Er FS
Er rS
CONTENTSOF FAILURE
NORMAL DISPLAY (NOTE 2)(See Pace 19)
Er dS
Er dH
Er FF
Er CF
Er CO
NORMAL DISPLAY (NOTE 1)(See pac e 19)
NORMAL DISPLAY (NOTE 2) (See PaCe 19 )
NORMAL OlSFLAY (NOTE 2) (See Pace 19)
FREEZER SENSOR
SHORTCIRCUIT
REFRIGERATOR SENSOR 1
SHORT CIRCUIT
REFRIGERATOR SENSOR 2
SHORT CIRCUIT
ABNORMAL SHORT CIRCUIT
DEFROST HEATER,
TEMPERATURE FUSE SHORT
CIRCUIT, UNPLUGGED
CONNECTOR(INDICATED
4 HOURLATER AFTER TROUBLE)
MOTORDEFECT HOOKEDOF LEAS
WIRETOFAN,CONTACTOF
STRGCTRES WITHFAN SHORTOR
OPENOFLEADWIRE(THEREIS
NOSIGNALOF BLOCMOTORMORE
THAN115SECONDSINOPERATION
OFFANMOTOR}
SHORT OR OPENOF LEASWIRE
CONNECTINGBETWEEN MAIN PCE
AND DISPLAYPCB,TRANSMISSION
TB AND RECEIVINGPART
© : PROPEROPERATION
PRODUCT OPERATION STAUS IN FAILURE
COMPRESSOR
ONFOR15MINUTES/
OFFFOR15MINUTES
©
FREEZINGBLOC
MOTOR
O
O
O
O
O
O
©
O
O
STANDARD RPM
STANDARD RPM
COOLINGBLDC
MOTOR
STANDARD RPM
STANDARD RPM
STANDARD RPM
OFF
STANDARD RPM
STANDARD RPM
O
O
O
DEFROST
HEATER
O
O
O
O
OFF
0
0
0
0
STEPPING MOTOR
DAMPTER
Q
NO DEFROST
O
©
O
0
©
O
O
FULLOPENINGFOR10MINUTES/
FULLCLOSINGFOR1S MINUTES
O
O
O
O
O
ABNORMAL
8 COMMUNICATION C_
9 ABNORMAL AMBIENTSENSOR SHORT
AMBIENT SENSOR CIRCUIT ©
10 ABNORMAL WATER TANK SENSOR ©
WATER TANK SENSOR SHORT CIRCUIT
11 ABNORMAL OPTICHILLSENSOR 0
OPTICHILL SENSOR SHORT CIRCUIT
-18-

MICOM FUNCTION
ALL DISPLAYPARTSTURN OFF OTHERTHAN FREEZER ROOMNOTCH TEMPERATUREDISPLAYAND REFRIGERATORROOM NOTCH TEMPERATUREDISPLAY(FAILURECODE INDICATIONPART)
INCASEOF INDICATINGFAILUREMODES(EXCEPT FORNOTE1,NOTE2)
NOTE1 ) FREEZERROOM NOTCHTEMPERATUREDISPLAYAND REFRIGERATORROOMNOTCH TEMPERATUREDISPLAY(FAILURECODE INDICATIONPART)ARE NORMALLY INDICATED INABNORMAL
AMBIENTSENSOR, AND "Er" INDICATEDONTHE AMBIENTTEMPERATUREDISPLAY(EXCEPTFORTHE AMBIENTTEMPERATUREDISPLAY,OTHERDISPLAYPARTSAREINDICATED NORMALLY)
NOTE 2) R2-SENSOR, WATER-TANK SENSOR AND OPTICHILL SENSOR IS NOT INDICATED ON THE FAILURE INDICATING PART BUT INDICATED INCHECKING ALL DISPLAY PARTS
(WHEN PRESSING THE TEMPERATRUE AND 4)) _ BUTTON INTHE LOCK STATUS FOR MORE THAN 1 SECOND).
R2-SENSOR(MIDDLE ROOM) [- N O R U A L : DISPLAY PARTGRAPHIC ON THE ,_/C_PARTTURNS ON
ABNORMAL DISPLAY PARTGRAPHIC ON THE _C)PART TURNS OFF
WATER-TANKSENSOR [- N O R M A L : DISPLAYPARTGRAPHICONTHE_.)_ PARTTURNSON
ABNORMAL DISPLAY PARTGRAPHIC ON THE @ PART TURNS OFF THE OTHER DISPLAY GRAPHICS TURN ON
OPTI-FRESH SENSOR [- N O R M A L : DISPLAYPARTGRAPHICONTHE(E_PARTTURNSON
ABNORMAL DISPLAY PARTGRAPHIC ON THE ,_F_PART TURNS OFF
(2)TEST FUNCTION
TESTKEYEXISTSONPWBASSY,MAINBOARD.
MODE OPERATION CONTENTS REMARKS
1. CONTINUOUS OPERATION OF COMPRESSOR 4. MAIN STEPPING MOTOR DAMPER IS COMPLETELY
PRESS TEST BUTTON ONCE 2. CONTINUOUS OPERATION OF FREEZING BLDC MOTOR OPENED (OPEN OF BAFFLE) FREEZING FAN TURNS OFF
TEST1 <STRONG COLD MOOE> (HIGH-SPEED RPM) AND COOLING BLDC MOTOR 5. ALL DISPLAY GRAPHICS TURNS ON IN DOOR OPENING
3. DEFROST HEATER TURNS OFF
PRESS TEST BUTON ONCE AT THE TEST 1. COMPRESSOR OFF 4. MAIN STEPPING MOTOR DAMPER IS COMPLETELY RETURN TO THE NORMAL
TEST2 MODE 1 S-ATUS 2. FREEZING BLDC MOTOR AND COOLING BLDC MOTOR CLOSED (CLOSING OF BAFFLE) MODE WHEN THE
<FORCED DEFROST MODE> TURN OFF 5. ALL DISPLAY GRAPHICS TURNS OFF (ONLY "FAILURE CODE DEFROST SENSOR IS
3. DEFROST HEATER TURNS ON INDICATION PART"TURNS ON FOR '22"STATUS) ABOVE +S°C
NORMAL PRESS TEST 8UTON ONCE AT THE TEST COMPERSSOR WILL OPERATE
STATUS MODE 2 STATUS RETRUING TO INITIAL STATUS AFTER DELAY FOR 7 MINUTES
;_-"LCD check function: If simultaneously pressing TEMPERATURE and 4 ))_' button for a second in the lock status, a
back light is turned on and all display LCD graphics on. If releasing the button, the LCD graphic
displays the previous status.
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MICOM FUNCTION
2-16. Test Function
1. The test function assists in diagnosing the PWB and determining the exact mode of failure.
2. The test button is on the main PCB. When test mode is engaged, it will complete its test cycle and default to normal
operation within 2 hours.
3. The buttons are disabled while the test mode is in effect.
4. When you have finished running test mode, unplug the refrigerator to reset it to normal operation.
5. If a failure is detected during test mode, release the test mode to display the failure code.
6. If a failure code is displayed, the test mode cannot be started.
Mode
Test 1
Test 2
Operation
Press test button once
(strong cold mode)
Press test button once at
the test mode 1 status
(forced defrost mode)
1,
2.
3.
4.
5.
6.
1.
2.
3.
4.
5.
Contents
Continuous operation of compressor
Continuous operation of freezing BLDC motor
(high-speed RPM) and cooling BLDC motor
Defrost heater turns off
Stepping motor damper is completely opened
(baffle is closed)
OptiFresh stepping motor damper is
completely closed.
All display LCD graphics turn on.
Compressor OFF
Freezing BLDC motor and cooling BLDC
motor turn off
Defrost heater turns on
Stepping motor damper is completely closed
(baffle is closed)
OptiFresh stepping motor damper is
completely closed.
Remarks
Freezer fan turns off when
door is opened.
Return to the normal mode
when the defrost sensor is
above +5°C (+41 °F)
Normal Press test button once at Return to the initial status. Compressor will operate
Status the test mode 2 status after delay for 7 minutes
<TEST MODE 1> <TEST MODE 2>
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