LG LBC20514TT - Titanium 19.7 cu. ft. Bottom Freezer Refrigerator... User manual

CAUTION
BEFORE SERVICING THE PRODUCT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
REFRIGERATOR
SERVICE MANUAL
MODELS:
LBC20514TT

CONTENTS
Pleasereadthefollowinginstructionsbeforeservicingyour
refrigerator.
1.Checktherefrigeratorforcurrentleakage.
2.Topreventelectricshock,unplugbeforeservicing.
3.Alwayschecklinevoltageandamperage.
4.Usestandardelectricalcomponents.
5.Don'ttouchmetalproductsinthefreezerwithwet
hands.Thismaycausefrostbite.
6.Preventwaterfromspilingontoelectricelementsorthe
machineparts.
7.Beforetiltingtherefrigerator,removeallmaterialsfrom
onorintherefrigerator .
8.Whenservicingtheevaporato,rwearglovestoprevent
injuriesfromthesharpevaporatorfins.
9.Serviceontherefrigeratorshouldbeperformedbya
qualifiedtechnician.Sealedsystemrepairmustbe
performedbyaCFCcertifiedtechnician.
SAFETY PRECAUTIONS
Safety Precautions………………………………………………................................ 2
1- Specifications…………………………………………………................................ 3
2- Parts Identifications …………………………………………................................ 4
3- Disassembly……………………………………………………............................... 5
Door……………………………………………………………...................................5
Door Switch……………………………………………………...................................5
Fan and Fan Motor……………………………………………..................................6
Defrost Control Assembly ……………………………………..................................6
Lamp……………………………………………………………..................................6
Refrigerator Control Box……………………………………….................................6
Multi Duct………………………………………………………..................................6
4- Ajustment……………………………………………………....................................7
Compressor……………………………………………………..................................7
PTC-Starter…………………………………………………….................................. 7
OLP (Overload Protector)…………………………………….................................. 8
To Remove the Cover PTC………………………………….................................. 8
5- Circuit Diagram……………………………………………..................................... 9
6- Troubleshooting……………………………………...................................……….10
Compressor and Electric Components…………………....................................…10
PTC and OLP …………………………………………....................................…….11
Other Electrical Components………………………….....................................……12
Service Diagnosis Chart……………………………....................................………13
Refrigeration Cycle…….………………………………....................................……14
7- Operation Principle and Repair Method of Ice Maker….................................16
8- Description of Function and Circuit of MICOM……….............................……19
11- Refrigerator Exploded View ….......................................................................38
- 2 -

1. SPECIFICATIONS
- 3 -
Models
LBC20514TT
Color Titanium
Capacity 20cuft
Dimensions (in) 29.8 (W) x 32.2 (D) x 67.9 (H)
Refrigerant R134A (4.2oz)
Climate Class Temperate(N)
Control Type F-control
Rating 115/60
Case Material EMBO(Normal)
Door Material VCM
Reversible Door Yes
Lamp (F) 1 (40W/Blue)
Lamp ( R ) 2 (40W/Blue)
Basket (F) 1 (plastic)
Basket ( R ) 2 (1/3)
2 (2/3)
1 full
Shelf (F) 1 Wire
Shelf ( R ) 4 fix
Cover, TV Humidity Control
Drawer Wire (lower)
Vegetable Yes
Tray Meat Yes
Multi Flow Yes
Specification

PARTSANDFEATURES
2. PARTS IDENTIFICATIONS
Use this section to become more familiar with the parts and features.
NOTE:This guide covers several different models.The refrigerator you have purchased may have some
or all of the items listed below.The locations of the features shown below may not match your model.
Digital Sensor Control
Refrigerator Light
Shelves
Snack Pan
Optibin Crisper
Keeps fruits and vegetable fresh and crisp
Ice Tray*
Ice Bin
Wire Durabase
Dairy Bin
Design-A-Door
Wire Freezer Shelf
Refrigerator Door Rack
Freezer Light
Freezer Door Rack
B
C
D
A
F
E
G
H
I
J
L
M
K
N
A
B
C
D
E
F
G
H
I
J
M
N
L
K
*on some models
- 4 -

3-1 DOOR
Refrigerator Door
1. Remove the hinge cover by pulling it upwards.
2. Loosen the hexagonal bolts attaching the upper hinge to
the body and lift the freezer door.
3. Pull out the door gasket to remove from the door foam
assembly.
Freezer Door
1. Loosen the hexagonal bolts attaching the lower hinge to
the body to remove the refrigerator door only.
2. Pull out the door gasket to remove from the door foam
assembly.
3-2 DOOR SWITCH
1. To remove the door switch, pry it out with a slotted-type
driver, as shown in (Figure 4).
2. Disconnect the lead wire from the switch.
3. DISASSEMBLY
BOLT
HINGE
HINGE COVER
Figure 1
GASKET
Figure 2
LOWER HINGE
BOLT
Figure 3
DOOR SWITCH
LEAD WIRE
Figure 4
- 5 -

3-3 FAN AND FAN MOTOR
1. Remove the freezer shelf. (If your refrigerator has an
icemaker, remove the icemaker first)
2. Remove the grille by pulling it out and by loosening a
screw.
3. Remove the Fan Motor assembly by loosening 2 screws
and disassemble the shroud.
4. Pull out the fan and separate the Fan Motor and Bracket.
3-4 DEFROST CONTROL ASSEMBLY
Defrost Control assembly consists of Defrost Sensor and
FUSE–M.
The Defrost Sensor works to defrost automatically. It is
attached to the metal side of the Evaporator and senses its
At 72°C, it turns the Defrost Heater off.
Fuse-M is a safety device for preventing over-heating of
the Heater when defrosting.
1. Pull out the grille assembly. (Figure 6)
2. Separate the connector with the Defrost Control
assembly and replace the Defrost Control assembly
after cutting the Tie Wrap. (Figure 7)
3-5 LAMP
3-5-1 Refrigerator Compartment Lamp
1. Unplug the power cord from the outlet.
2. Remove refrigerator shelves.
3. Release the hooks on both ends of the lamp shield and
pull the shield downward to remove it.
4. Turn the lamp counterclockwise.
5. Assemble in reverse order of disassembly. Replacement
bulb must be the same specification as the original
(Max. 60 W-2EA).
3-5-2 Freezer Compartment Lamp
1. Unplug refrigerator or disconnect power.
2. Reach behind light shield to remove bulb.
3. Replace bulb with a 60-watt appliance bulb.
4. Plug in refrigerator or reconnect power.
3-6 CONTROL BOX-REFRIGERATOR
1. First, remove all shelves in the refrigerator, than remove
the Refrigerator control Box by loosening 2 screws.
2. Remove the Refrigerator Control Box by pulling it
downward.
3. Disconnect the lead wire on the right position and
separate the lamp sockets.
3-7 MULTI DUCT
1. Remove an upper and
lower Cap by using a flat
screwdriver, and loosen 3
screws. (Figure 11)
2. Disconnect the lead wire
on the bottom position.
GRILLE ASSEMBLY
Figure 6
DEFROST-CONTROL
ASSEMBLY
Figure 7
Figure 8
Figure 9
CONTROL BOX
COVER LAMP Figure 10
Figure 11
5. Pull out the fan and separate the Fan Motor and Bracket.
GRILLE
FAN MOTOR
BRACKET
MOTOR
Figure 11
FAN
Temperature.
- 6 -

4-1 COMPRESSOR
4-1-1 Role
The compressor intakes low temperature and low pressure
gas from the evaporator of the refrigerator and compresses
this gas to high-temperature and high-pressure gas. It then
delivers the gas to the condenser.
4-1-2 Composition
The compressor includes overload protection. The PTC
starter and OLP (overload protector) are attached to the
outside of the compressor. Since the compressor is
manufactured to tolerances of 1 micron and is hermetically
sealed in a dust and moisture-free environment, use
extreme caution when repairing it.
4-1-3 Note for Usage
(1) Be careful not to allow over-voltage and over-current.
(2) If compressor is dropped or handled carelessly, poor
operation and noise may result.
(3) Use proper electric components appropriate to the
Particular Compressor in your product.
(4) Keep Compressor dry.
If the Compressor gets wet (in the rain or a damp
environment) and rust forms in the pin of the Hermetic
Terminal, poor operation and contact may result.
(5) When replacing the Compressor, be careful that dust,
humidity, and soldering flux don’t contaminate the inside
of the compressor. Dust, humidity, and solder flux
contaminate the cylinder and may cause noise,
improper operation or even cause it to lock up.
4-2 PTC-STARTER
4-2-1 Composition of PTC-Starter
(1) PTC (Positive Temperature Coefficient) is a no-contact
semiconductor starting device which uses ceramic
material consisting of BaTiO3.
(2) The higher the temperature is, the higher the resistance
value. These features are used as a starting device for
the Motor.
4-2-2 Role of PTC-Starter
(1) The PTC is attached to the Sealed Compressor and is
used for starting the Motor.
(2) The compressor is a single-phase induction motor.
Durign the starting operation, the PTC allows current
flow to both the start winding and main winding.
4-2-3 PTC-Applied Circuit Diagram
Starting Method for the Motor
4-2-4 Motor Restarting and PTC Cooling
(1) It requires approximately 5 minutes for the pressure to
equalize before the compressor can restart.
(2) The PTC device generates heat during operation.
Therefore, it must be allowed to cool before the
compressor can restart.
4-2-5 Relation of PTC-Starter and OLP
(1) If the compressor attempts to restart before the PTC
device is cooled, the PTC device will allow current to
flow only to the main winding.
(2) The OLP will open because of the over current
condition. This same process will continue (3 to 5
times) when the compressor attempts to restart until
the PTC device has cooled. The correct OLP must be
properly attached to prevent damage to the
compressor.
Parts may appear physically identical but could have
different electrical ratings. Replace parts by part
number and model number. Using an incorrect part
could result in damage to the product, fire, injury, or
possibly death.
4-2-6 Note for Using the PTC-Starter
(1) Be careful not to allow over-voltage and over-current.
(2) Do not drop or handle carelessly.
(3) Keep away from any liquid.
If liquid such as oil or water enters the PTC,
PTC materials may fail due to breakdown of their
insulating capabilities.
(4) If the exterior of the PTC is damaged, the resistance
value may be altered. This can cause damage to the
compressor and result in a no-start or hard-to-start
condition.
(5) Always use the PTC designed for the compressor and
make sure it is properly attached to the compressor.
Parts may appear physically identical but could have
different electrical ratings. Replace parts by part
number and model number. Using an incorrect part
could result in damage to the product, fire, injury, or
possibly death.
4. ADJUSTMENT
PTC STARTER SEALED
TERMINAL
COMPRESSOR
MOTOR
C
M
SM
36
5
2
S
PTC
N
L1
OVERLOAD PROTECTOR
Resistance Starter Capacitor Running Figure 12
- 7 -

4-3 OLP (OVERLOAD PROTECTOR)
4-3-1 Definition of OLP
(1) OLP (OVERLOAD PROTECTOR) is attached to the
Compressor and protects the Motor by opening the
circuit to the Motor if the temperature rises and
activating the bimetal spring in the OLP.
(2) When high current flows to the Compressor motor, the
Bimetal works by heating the heater inside the OLP,
and the OLP protects the Motor by cutting off the
current flowing to the Compressor Motor.
4-3-2 Role of the OLP
(1) The OLP is attached to the Sealed Compressor used
for the Refrigerator. It prevents the Motor Coil from
being started in the Compressor.
(2) For normal operation of the OLP, do not turn the Adjust
Screw of the OLP in any way.
4-4 TO REMOVE THE COVER PTC
1) Remove the Cover Back M/C.
(2) Remove the screw on Cover PTC.
(3) Remove two Housings on upper part of Cover PTC.
(4) Take out the cover PTC from upper to lower position
like ( 1 ).
(5) Turn 45¡ in the direction of (2)and take it out.
(6) Assembly in reverse order of disassembly.
Part
Customer part
number
Lot code/
date code
330 FBYY -S1 BOX98
12345678
Physical
termination
part number
Electrical
characteristics
part number
No. Name
Base, phenolic
(UL 94 V-0 rated)
Movable arm support, plated steel
Stationary contact support,
plated steel
Heater support, plated steel
Heater, resistance alloy
Disc, thermostatic alloy
Movable arm, spring temper
copper alloy
Contact, movable, silver on copper
Contact, stationary, silver on copper
Slug, plated steel
Cover, polyester
(UL 94 V-0 rated)
Pin connector, plated copper alloy
(To engage 2.33/2.66 mm dia. pin)
Quick-connect terminal, brass,
conforms to UL 310, MEMA
DC-2, DIN 46344
(OVERLOAD PROTECTOR cross section)
Figure 13
1
2
- 8 -

5. CIRCUIT DIAGRAM
- 9 -
4
CON101 BK
19
PK
6
BO 3SB 52 8
WHPR 7YL
PWB(PCB) ASSEMBLY,DISPLAY
CON5
2 64 BK 5
PR
CON4
PKWH
BO 3
8 11 13 107 YL 10 111 12 8 9SB 9
MOTOR
STEPPING
F-FAN
7
BL
3BK YLWH 5 6
PR 41 RD
GY
2
L1
11
CON1
CORD
POWER BN
10
BN
9
SB
SUPPLY SB 1
BL BK
5 4
7
CON2
YL
BN
YL BK
6
BN
2
BL
BL 7
3
BL
L
GN/YL
(GN)
N
GN/YL
M
ICE MAKER PART
(GN)
(98 C)
FUSE-M
BK
V
Cr
RD
8
BO
1
DEF-SENSOR
BPERCEPTION S/W
F-DOOR
4
PK A
BO
3
2PK
7F-SENSOR
6BL
WH R-SENSOR
WH
5
RD
5SB
1
32
SB
PK
22
FUSE-M
RD
(72 C)
OLP
BK
OLP
4
DOOR S/W-F
B
A
BO
nc
PR
nc
DC
nc nc com
com
DOOR S/W-R
com
com
CON6
BL
8
CON4
CON2
BK
WH
1
WH
2
2
WH
WH
1
CON1
1
CON5
CON3
WH
1
CON6
1
BL
2
1
RD
BK
44
33
Cs
BLBL
PWB (PCB) ASSEMBLY, ICE MAKER
TO CHANGE IN DIFFERENT LOCALITIESAND MODEL TYPE.
*PLUG TYPE, ICE MAKER PART, CAPACITOR PART,
P.T.C STARTOPTION, COMP' EARTH PARTAND COMP'
ACCESSORIES ON CIRCUIT DIAGRAMARE SUBJECT
55
66
S
M
PARTPART
S
MBL
BL
Cr BK
L
/YL
GNGN
/YL
COMP' EARTHCOMP' EARTH
(GN)(GN)
* ALTERNATIVE COMP' ACCESSORIES
BL BL
EG COMP'
3
2
MC,MQ COMP'
* P.T.C STARTOPTION
PTC
OLP
COMBO KIT(PTC+OLP) MEZ48108403
325
6
N446
5
6
RD
HEATER,
ICE SENSOR
ICE MAKER
MOTOR
SHEATH
I/MAKER
W/VALVE
S/W
CAPACITOR PART
PTC STARTER
COMP' ACCESSORIES
POWER
HEATER,SHEATH
F-LAMP
R-LAMPS
PWB(PCB) ASSEMBLY, MAIN
PK:PINKYL:YELLOW
BK:BLACK GN:GREEN BN:BROWNWH:WHITE PR:PURPLE BO:BRIGHT ORANGE BL:BLUE RD:REDSB:SKY BLUE
GY:GREY
WH
/RD BL
/WH
DC
GY GY
12
R-DOOR PERCEPTION S/W
WH
/RD BL
/WH
M
C-FAN
BL
BK

6. TROUBLESHOOTING
6-1 COMPRESSOR AND ELECTRIC COMPONENTS
1
2
3
4
5
2
5
5
3
5
1
43
YES
NO
YES
The range of resistance is between 1~50 ? (ok)
Open or short
YES YES
NO
NO
Power Source.
No voltage.
(Rated voltage
±10%)?
Replace OLP.
Reconnect.
Refer to Page 12.
Did
compressor
start? Compressor
is OK
Replace the
compressor
Check connection
condition.
OLP disconnected?
Advise customer that
power supply needs to be
checked by an electrician.
Supply
voltage rating
with ±10%.
Applied voltage isn't
in acceptable range.
(115V ±10%)
Remove PTC-Starter
from compressor and
measure voltage
between Terminal C of
compressor and
terminal 5 or 6 of PTC.
Check resistance of
two terminals in
PTC-Starter.
Check resistance of two
terminals in OLP.
Check the power supply
under load.
(Compressor attempting
to re-start after being off
for 5 minutes).
.
Check
resistance of
PTC-Starter.
Check OLP.
Check
starting state.
Check resistance
of motor
compressor.
Check the resistance
between M-C, S-C and
M-S in motor compressor. Replace
compressor
Refer to Page 12.
Check
resistance of
motor
compressor.
- 10 -

6-2 PTC AND OLP
65
Shows continuity
Open
Separate PTC-Starter
from Compressor and
measure resistance
between No. 5 and 6
of PTC-Starter with a
Tester.
(Figure 19)
Observation value is
115V/60Hz : 6.8 ?±30%
The resistance value
is 0 ?(short) or
8(open).
Check another
electric component.
Replace OLP.
Replace PTC-
Starter.
Figure 19 Figure 20
Normal operation of
compressor is impossible
or poor.
Separate OLP from
compressor and check
resistance value between
two terminals of OLP whit a
tester.
(Figure 20)
?
- 11 -

Not cooling at all
Poor cooling performance
Compressor
doesn't run.
Compressor runs
poorly. Check starting
voltage.
Check for open short or
incorrect resistance readings
in the following components
a. Starting devices
b. OLP
c. Compressor coil
d.Wiring harness
Low voltage.
Short, open, or broken.
Poor contact
or shorted.
Coil open or shorted.
Poor contact
or shorted.
Poor or broken or
open contact.
Shorted.
Lack of capacity.
Replace
indicated component.
Advise customer that
the power supply
needs to be checked
by an electrician.
Replace
indicated component.
Cause
Check voltage at
starting devices.
Check current flowing
in sub-coil of
Compressor.
Check rating of OLP.
Fan motor
doesn't run. Wire is open or
shorted.
Coil is shorted
or open.
Open.
Open. Replace
defrost heater.
Replace
indicated component.
Replace
indicated component.
Check wiring circuit.
Check Fan Motor.
Check current flow in
the following
components:
Sensor
Fuse-M
Check current flow in
the defrost heater.
6-3 OTHER ELECTRICAL COMPONENTS
Heavy frost buildup on
evaporator
- 12 -

6-4 SERVICE DIAGNOSIS CHART
COMPLAINT POINTS TO BE CHECKED REMEDY
Other possible problems:
Check if frost forms in
the freezer. Check Components
of the defrosting
circuit.
Check the
refrigeration system.
Check the
Thermistor.
Not
defrosting
The system
is faulty. Perform sealed
system repair.
Replace the
Thermistor.
The operation of
the Thermistor is
incorrect.
No Cooling.
Cools poorly.
Foods in the
Refrigerator
are frozen.
Condensartion or ice
forms inside
the unit.
Condensartion forms
in the Exterior Case.
There is abnormal
noise.
Door does not
close well.
Ice and foods
smell unpleasant.
•Is the power cord unplugged from the outlet?
•Check if the power switch is set to OFF.
•Check if the fuse of the power switch is shorted.
•Measure the voltage of the power outlet.
•Check if the unit is placed too close to the wall.
•Check if the unit is placed too close to the stove,
gas cooker, or in direct sunlight.
•Is the ambient temperature too high or
the room door closed?
•Check if food put in the refrigerator is hot.
•Did you open the door of the unit too often
or check if the door is sealed properly?
•Check if the Control is set toWarm position.
•Is food placed in the cooling air outlet?
•Check if the control is set to colder position.
•Is the ambient temperature below 41°F(5°C)?
•Is liquid food sealed?
•Check if food put in the refrigerator is hot.
•Did you open the door of the unit too
often or check if the door is sealed properly?
•Check if the ambient temperature and humidity
of the surrounding air are high.
•Is there a gap in the door gasket?
•Is the unit positioned in a firm and even place?
•Are any unnecessary objects placed
in the back side of the unit?
•Check if the Tray Drip is not firmly fixed.
•Check if the cover of the compressor enclosure
in the front lower side is taken out.
•Check if the door gasket is dirty with
an item like juice.
•Is the refrigerator level?
•Is there too much food in the refrigerator?
•Check if the inside of the unit is dirty.
•Are foods with a strong odor unwrapped?
•The unit smells of plastic.
•Plug into the outlet.
•Set the switch to ON.
•Replace the fuse.
•If the voltage is low, correct the wiring.
•Place the unit about 4 inches (10 cm) from the wall.
•Place the unit away from these heat sources.
•Lower the ambient temperature.
•Put in foods after they have cooled down.
•Don't open the door too often and close
it firmly.
•Set the control to Recommended position.
•Place foods in the high-temperature section.
(front part)
•Set the control to Recommended position.
•Set the control toWarm position.
•Seal liquid foods with wrap.
•Put in foods after they have cooled down.
•Don't open the door too often and close
it firmly.
•Wipe moisture with a dry cloth. It will disappear
in low temperature and humidity.
•Fill up the gap.
•Adjust the Leveling Screw, and position the
refrigerator in a firm place.
•Remove the objects.
•Fix the Tray Drip firmly in the original position.
•Place the cover in its original position.
•Clean the door gasket.
•Position in the firm place and level the
Leveling Screw.
•Make sure food stored in shelves does not prevent
the door from closing.
•Clean the inside of the unit.
•Wrap foods that have a strong odor.
•New products smell of plastic, but this
will go away after 1-2 weeks.
- 13 -

6-5 REFRIGERATION CYCLE
* Troubleshooting Chart
¥
¥
¥
¥
¥
¥
¥
¥
¥
¥
¥
¥
¥
CAUSE TEMPERATURE
OF THE
COMPRESSOR REMARKS
STATE OF
THE UNIT STATE OF THE EVAPORATOR
LEAKAGE
CLOGGEDBYDUST
DEFECTIVE
COMPRESSION
PARTIAL
LEAKAGE
Freezer
compartment and
refrigerator don’t
cool normally
COMPLETE
LEAKAGE
PARTIAL
CLOG
WHOLE
CLOG
MOISTURE
CLOG
COMPRE-
SSION
NO
COMPRE-
SSION
Freezer
compartment and
refrigerator don’t
cool normally
Freezer
compartment and
refrigerator don’t
cool normally
Freezer
compartment and
refrigerator don’t
cool.
Cooling operation
stops periodically.
Freezer and
refrigerator don’t
cool.
No compressing
operation.
Low flowing sound of
refrigerant is heard and frost
forms in inlet only.
Flowing sound of refrigerant
is not heard and frost isn’t
formed.
Flowing sound of refrigerant
is heard and frost forms in
inlet only.
Flowing sound of refrigerant is
not heard and frost isn’t
formed.
Flowing sound of refrigerant is
not heard and frost melts.
Low flowing sound of
refrigerant is heard and frost
forms in inlet only.
Flowing sound of refrigernat is
not heard and there is no
frost.
A little higher than
ambient
temperature.
- Refrigerant level is low due to a
leak.
- Normal cooling is possible by
restoring the normal amount of
refrigerant and repairing the leak.
Equal to ambient
temperature. - No discharging of refrigerant.
- Normal cooling is possible by
restoring the normal amount of
refrigerant and repairing the leak.
A little higher than
ambient
temperature.
- Normal discharging of the
refrigerant.
- The capillary tube is faulty.
Equal to ambient
temperature. - Normal discharging of the
refrigerant.
Lower than ambient
temperature. - Cooling operation restarts when
heating the inlet of the capillary
tube.
Alittle higher than
ambient
temperature.
- Low pressure at high side of
compressor due to low
refrigerant level.
Equal to ambient
temperature - Nopressure in the high pressure
part of the compressor.
- 14 -

6-5-1 SEALED SYSTEM DIAGNOSIS
Not Cooling Complaint
All components operating, No airflow problems, Not frosted up as a defrost problem
problem has been isolated to sealed system area
Frost
Pattern?
Equalization
Test
Partial
Very Fast
Inefficient
Compressor Partial Restriction Complete Restriction
Equalization
Test
Condenser
Temperature
None
Very Fast
Very SlowVery Slow
Hotter than Normal
Air/Low Side
Leak Loss of Change
Compressor Not
Pumping
Cap Tube
Sound
Room Temperature
Trace of Oil
Undercharge
Leak
Yes
No
Faint
Fast
None to Weak
(The equalization test is trying to restart a compressor after it has been operating.)
- 15 -

7-1 OPERATION PRINCIPLE
7-1-1 Operation Principle of Ice Maker
7. OPERATION PRINCIPLE AND REPAIR METHOD OF ICE MAKER
1. Turning the Icemaker stop switch off (O) stops the icemaking function.
2. Setting the Icemaker switch to OFF and then turning it back on will reset the icemaker control.
Start Position
Icemaking
Mode
Harvest
Mode
Park Position
Fill
•
Test Mode
Waits until water becomes cold after starting the
Icemaking operation.
• Runs MOTOR to drop ice from the tray into the ICE BIN.
• Performs Icemaking Mode after supplying water by operating
the SOLENOID in ICE VALVE.
• To operate LINE and SERVICE, press and hold the Cube Size button
for 3 seconds. The icemaking will run through 3 stages:
Harvest Fill Icemaking.
• With the detect lever, checks if the ICE BIN is full.
Power (On/Off) Switch
Power On
Adjusts Ejector to Start Position with power on.
Cube Size button
- 16 -

7-2 ICE MAKER FUNCTIONS
7-2-1 Ice Making Mode
1. Icemaking refers to the freezing of supplied water in the ice trays. Complete freezing is assured by measuring the
temperature of the Tray with icemaking SENSOR.
2. Icemaking starts after completion of the water fill operation.
3. The icemaking function is completed when the sensor reaches -7°C, 60 to 240 minutes after starting.
NOTE : After icemaker power is ON, the icemaker heater will be on for test for 9 sec.
7-2-2 Harvest Mode
1. Harvest (Ice removing) refers to the operation of dropping ices into the ice bin from the tray when icemaking has
completed.
2. Harvest mode:
(1) The Heater is ON for 30 seconds, then the motor starts.
(2) Harvest mode is completed if it reaches start position again while Heater & Motor are on at the same time.
A. ice bin is full : The EJECTOR stops (heater off).
B. ice bin is not full : The EJECTOR rotates twice to open for ice.
NOTE : If the EJECTOR does not rotate once within 5 minutes in status (2), separate heater control mode starts
operating to prevent the EJECTOR from being constrained. (It is recommended that the user open for ice to
return to normal mode.)
7-2-3 Fill/Park Position
1. Once a normal harvest mode has been completed, the water solenoid will be activated.
2. The amount of water is adjusted by pressing the fill key repeatedly. This changes the time allowed for fill as illustrated in
the table below.
Water supply amount table
STAGE TIME TO SUPPLY INDICATIONS REMARKS
1
2
3
6 sec.
7 sec.
8 sec.
The water amount will vary depending
on the water control switch setting, as
well as the water pressure of the
connected water line.
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7-2-5 Function TEST
1. This is a compulsory operation for test, service, cleaning, etc. It is operated by pressing and holding the Cube Size button for 3 seconds.
2. The test works only in the Icemaking Mode. It cannot be entered from the Harvest or Fill mode. (If there is an ERROR, it
can only be checked in the TEST mode.)
3. Caution! If the test is performed before water in the icemaker is frozen, the ejector will pass through the water. When the fill
mode begins (Stage 4), unless the water supply has been shut off, added water will overflow into the ice bin. If the control
Doesn’t operate normally in the TEST mode, check and repair as needed.
4. After water is supplied, the normal CYCLE is followed: icemaking Harvest Fill Park Position.
5. Five seconds after Stage 5 is completed, the icemaker returns to MICOM control. The time needed to supply water
resets to the pre- test setting.
Diagnosis TABLE
7-3 DEFECT DIAGNOSIS FUNCTION
7-3-1 ERROR CODES shown on Ice Maker water supply control panel
ERROR indicators in table can be checked only in TEST mode.
STAGE ITEMS INDICATOR REMARKS
1
2
3
4
5
6
HEATER
MOTOR
HALL IC
(TRAY)
SOLENOID VALVE
HALL IC
(LEVER)
Reset
Five seconds after heater starts, heater will
go off if temperature recorded by sensor is
10°C (50°F)or lever is in up position.
Five seconds after heater starts, you can
confirm that motor is moving.
You can confirm Hall IC detection of position.
Two seconds after detection of initial
position, you can confirm that valve is on.
You can check when the Hall IC is sensing a full
ice condition. (If there is a water fill error, the
fifth LED is not on.)
Five seconds after fifth stage is completed,
the icemaker resets to initial status.
Return to Status prior to
TEST MODE
NO DIVISION INDICATOR REMARKS
1
2
3
Normal
Icemaking
Sensor
malfunction
Icemaker Kit
malfunction
None Display switch
operates properly
Make sure that the wire
on each sensor is
connected.
Check
HALL IC/MOTOR/
HEATER/RELAY
*
*
PROBLEM
Note fill times
(see previous page)
Open or shorted wire or sensor
Ejector blades have not reached
the park position after 18
minutes from start of harvest
mode
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8-1 FUNCTION
8-1-1 Function
1. When the appliance is plugged in, it is set to "4" for Refrigerator and "4" for freezer.
You can adjust the Refrigerator and the Freezer control temperature by pressing the ADJUST button.
2. When the power is initially applied or restored after a power failure, it is automatically set to "4" & "4".
8-1-2 Control of freezer fan motor
1. Freezer fan motor has high and standard RPMs.
2. High RPM is used when electricity is first on, for ICE PLUS , and when refrigerator is overloaded.
But standard RPM is used for general purposes.
3. To improve cooling speed and load corresponding speed, the RPM of freezer fan motor shall change from normal speed
to hign speed.
4. High speed (2500RPM) : Initial power on or load corresponding operation, ICE PLUS.
Normal speed ( 2200 RPM): general working conditions.
5. Fan motor stops when refrigerator of freezer door opens.
8-1-3 ICE PLUS
1. The purpose of this function is to intensify the cooling speed of freezer and to increase the amount of ice.
2. Whenever selection switch is pressed, selection/release, the LED will turn ON or OFF.
3. If there is a power cut and the refrigerator is power on again, ICE PLUS function will be canceled.
4.To activate these function you need to press the ICE PLUS key and the LED will turn ON. This function will remain
activated for 24 hrs. The first three hours the compressor and ICE PLUS will be ON. The next 21hours the freezer will
be controlled at the lowest temperature. After 24 hours or if the ICE PLUS key is pressed again, the freezer will
return to its previous temperature.
5. For the first three hours notice the following cases:
(1) Compressor and freezer fan(HIGH RPM) continuously operate for three hours.
(2) If defrost starts during ICE PLUS, ICE PLUS operates for the rest of time after defrost is
completed, when ICE PLUS operation time is less than 90 minutes.
If ICE PLUS operates for more than 90minutes, the ICE PLUS will operate for two hours after
defrost is completed.
(3) If ICE PLUS is pressed during defrost, ICE PLUS LED is on but this function will start seven
minutes after defrost is completed and it shall operate for three hours.
(4) If ICE PLUS is selected within seven minutes after compressor has stopped, the compressor (compressor
delays seven minutes) shall start after the balance of the delay time.
(5) The fan motor in the freezer compartment rotates at high speed during ICE PLUS.
6. For the rest of 21 hours, the freezer will be controlled at the lowest temperature.
8-1-4. REFRIGERATOR LAMP AUTO OFF
1. To protect the risk of lamp heat, when Refrigerator door opens for 7 min., refrigerator lamp is auto off.
8. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM
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8-1-5 Alarm for Open Door
1. This feature sounds a buzzer when the freezer or refrigerator door is not closed within 1 minute after it is opened.
2. One minute after the door is opened, the buzzer sounds three times each for 1/2 seconds. These tones repeat every 30
seconds.
3. The alarm is cancelled when the freezer or the refrigerator is closed while the buzzer sounds.
8-1-6 Buzzer Sound
When the button on the front Display is pushed, a Ding~ Dong~ sound is produced.
(Refer to the Buzzer Circuit 8-2-4 No. 3)
8-1-7 Defrosting (removing frost)
1. Defrosting starts each time the COMPRESSOR running time reaches 7 hours.
2. For initial power on or for restoring power, defrosting starts when the compressor running time reaches 4 hours.
3. Defrosting stops if the sensor temperature reaches 46.4°F(8°C) or more. If the sensor doesn’t reach 46.4°F(8°C) in
2 hours, the defrost mode is malfunctioning. (Refer to the defect diagnosis function, 8-1-9.)
4. Defrosting won’t function if its sensor is defective (wires are cut or short circuited)
8-1-8 Electrical Parts Are Turned On Sequentially
Electrical parts such as COMP, defrosting heater, freezer FAN, etc. are turned on in the following order to prevent noise and
parts damage. Several parts are started at the same time at initial power on and are turned off together when TEST is
completed.
Closed Open Closed Open
Closed
3 Times 3 Times 3 Times 3 Times
Within 1 min. 1 min. 30 sec 30 sec 30 sec
Freezer Door
or Refrigerator
Door
Buzzer
OPERATING ORDERS
Temperature of Defrosting
Sensor is 45°C or more
(when unit is newly
purchased or when moved)
Temperature of defrosting
sensor is lower than 45°C
(when power cuts, SERVICE)
Reset to normal operation
from TEST MODE
Initial power on
POWER
ON
in 1/2 second in 1/2 second
Total load
OFF COMP ON Freezer FAN ON
in 7 minute in 1/2 second
COMP
ON Freezer FAN ON
POWER
ON
COMP
ON Freezer FAN ON
Defrosting
heater ON Defrosting
heater OFF
in 1/2 second
in 1/2 second in 1/2 second
in 10 second
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