LG LTCS20220W User manual

MODELS:
LTCS20220W /01
LTCS20220B /01
LTCS20220S /01
REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

CONTENTS
- 2 -
WARNINGS AND SAFETY PRECAUTIONS ....................................................................................
1. SPECIFICATIONS .........................................................................................................................
2. PARTS IDENTIFICATION ..............................................................................................................
3. DISASSEMBLY...............................................................................................................................
3-1 Remove Freezer Door...............................................................................................................
3-2 Remove Refrigerator Door........................................................................................................
3-3 Replace Refrigerator Door........................................................................................................
3-4 Replace Freezer Door...............................................................................................................
3-5 Reverse Freezer Door...............................................................................................................
3-6 Reverse and Reattached Refrigerator Door..............................................................................
3-7 Leveling and Door closing.........................................................................................................
3-8 Door Alignment.........................................................................................................................
3-9 Fan and Fan Motor....................................................................................................................
3-10 Defrost Control Assembly........................................................................................................
3-11 Lamp.......................................................................................................................................
3-12 Control Box-Refrigerator.........................................................................................................
4. ADJUSTMENT...............................................................................................................................
4-1 Compressor..............................................................................................................................
4-2 PCT-Starter ..............................................................................................................................
4-3 OLP (Overload Protector).........................................................................................................
5. CIRCUIT DIAGRAM.......................................................................................................................
6. TROUBLE SHOOTING...................................................................................................................
6-1 Compressor and electric components .....................................................................................
6-2 PTC and OLP ...........................................................................................................................
6-3 Other electrical components ....................................................................................................
6-4 Service diagnosis chart ............................................................................................................
6-5 Refrigeration cycle ...................................................................................................................
7. OPERATION PRINCIPLE AND REPAIR METHOD OF ICEMAKER ............................................
7-1 Operation principle ...................................................................................................................
7-2 Ice maker functions ..................................................................................................................
7-3 Defect diagnosis function .........................................................................................................
8. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM ..............................................................
8-1 Function ...................................................................................................................................
8-2 PCB function ............................................................................................................................
8-3 Resistance specification of sensor ...........................................................................................
9. EXPLODED VIEW AND REPLACEMENT LIST............................................................................
2
3
4
5
5
5
6
6
6
7
10
10
10
11
11
11
12
12
12
13
14
15
15
16
17
18
19
20
20
21
23
24
24
27
30
30
SAFETY PRECAUTIONS
Please read the following instructions before
servicing your refrigerator.
1. Check the refrigerator for current leakage.
2. To prevent electric shock, unplug before
servicing.
3. Always check line voltage and amperage.
4. Use standard electrical components.
5. Don't touch metal products in the freezer with
wet hands. This may cause frost bite.
6. Prevent water from spiling on to electric
elements or the machine parts.
7. Before tilting the refrigerator, remove all
materials from on or in the refrigerator.
8. When servicing the evaporator, wear gloves to
prevent injuries from the sharp evaporator fins.
9. Service on the refrigerator should be performed
by a qualified technician. Sealed system repair
must be performed by a CFC certified technician.

- 3 -
1. SPECIFICATIONS
LTCS20220W /00 LTCS20220B /00 LTCS20220S /00 LTCS24223W /00 LTCS24223B /00 LTCS24223S /00
White Black Stainless White Black Stainless
Stainless Stainless
(29 3/4 x 28 15/16 x 66 3/16)in (32 3/4 x 28 15/16 x 68 9/16)in
20cuft 24cuft
R134a
Temperate (N)
Pocket Handle
97 Kg
Ice Bin
Humidity Control
LED (2)
Glass(2)
Heater, Sheath
Water Tank Heater
Embo (normal)
PCM
Wire Condenser
Polyol Ester (POE) RL-7H/7 cst 220 ± 10 cc
MOLECULAR SIEVE XH-7
ID Ø0.75
MICOM control
Full Automatic
Heater Defrost
Polyurethan
2 full + 1 small
Yes
No
Plastic (2)
LED (1)
Glass (1)
7 - 40 Hours
PCM
Fin Tube Type
4 Hours
Fan Cooling
BMA069LAMV
115V~ / 60Hz
Climate class
MODELS
SPECIFICATIONS
Capacity
Refrigerant
Net Weight
Dimensions (W*D*H)
GENERAL FEATURES
Color
Anti-freezing Heater
Cooling System
Rated Rating
Insulation
Compressor
Temperature Control
Defrosting System
Evaporator
Capillary Tube
First Defrost
Condenser
Lubricanting Oil
Drier
REFRIGERATOR
Case Material
Door Material
Handle Type
Basket, Quantity
Defrost Cycle
Desfrosting Device
FREEZER
Basket, Quantity
Tray meat
Ice Tray & Bank
Cover, T/V
Lamp
Shelf
Tray Egg
Lamp
Shelf

2. PARTS IDENTIFICATION
- 4 -
Use this section to become more familiar with the parts and features.
NOTE: This guide covers several diferent 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.
Custom Cube Icemaker *
Ice Bin
Ice Tray *
Freezer Shelf
Freezer Temperature Control
Refrigerator Temperature Control
Shelves
Refrigerator Light (LED)
Pantry Drawer
Crispers
Freezer light (LED)
Freezer Door Bins
* On some models
A
B
C
D
E
F
G
H
J
K
L
I
Dairy Bin
M
AO
B
C
D
E
F
G
H
L
N
I
J
M
K
Refrigerator Door Bins
N
F. Deco Duct
N

- 5 -
3. DISASSEMBLY
Middle
Hinge Bracket
Fig. 4
Fig. 5
Fig. 6
TOOLS NEEDED
REMOVING THE FREEZER DOOR
REMOVING THE REFRIGERATOR DOOR
Fig. 1
Fig. 2
Hinge Pin
Middle Hinge Bracket
Fig. 3
• 10mm or 13/32 -inch socket wrench
• (with 2-inch extension for bottom door hinge)
• No. 2 Phillips head screwdriver
• Flat-head screwdriver for prying
• Adjustable wrench
Remove the top-hinge cover by gently prying it with a flat head
screwdriver.
Loosen and remove the two bolts using a phillips head
screwdriver.
Remove the middle hinge bracket.
Carefully lift up the door. Place the door on a non scratching
surface.
Using either a 10 mm or 13/32 in. socket wrench, remove the
three bolts and lift off the top hinge. Set parts aside.
Carefully lift up the freezer door. Place the door on a non-
scratching surface.
WARNING WARNING
Excessive Weight Hazard:
Use two or more people to remove and install the
refrigerator doors. Failure to do so can result in back or
other injury.
Electrical Shock Hazard
• Disconnect the electrical supply to the refrigerator
before installing. Failure to do so could result in
serious injury or death.
• Do not put hands, feet or other objects into the air
vents, base grille, or bottom of the refrigerator. You
may be injured or receive an electrical shock.

- 6 -
REPLACING THE REFRIGERATOR DOOR
REPLACING THE FREEZER DOOR
Fig. 7
Fig. 8
Fig. 9
Fig. 10
Lower the door onto the bottom hinge pin.
Place the hinge pin of the middle hinge bracket inside of the
hinge pin insert on top of the door. Hold the door in place and
line the middle hinge bracket with the holes in the refrigerator
housing.
Use the two bolts and phillips screwdriver to refasten the
middle hinge bracket and door to the refrigerator housing.
Set the freezer door onto the Middle Hinge pin.
Place the upper hinge pin in the top of the freezer
door and line up the upper hinge with the holes on
top of the refrigerator. Use the three bolts to
replace the hinge.
Carefully force-fit the top hinge cover back into place over the
hinge.
Fig. 11
REVERSING DOORS
CAUTION
Remove food and any Adjustable Shelves or Door
Bins from doors. Failure to do so could result in
serious injury.
TOOLS NEEDED
• 10mm or 13/32 inch socket wrench (with 2-inch
extension for bottom door hinge)
• No. 2 Phillips head screwdriver
• 1/4 inch socket wrench
• Flat-head screwdriver for prying
• Adjustable wrench
• 3/32 - inch hex wrench
REVERSING THE FREEZER DOOR
Gently pry off the top hinge cover with a flat head
screwdriver and remove.
Using 10mm or 13/32 inch socket wrench, remove the three
bolts and lift off the top hinge. Set parts aside.
Fig. 17
Top Hinge
Fig. 18

- 7 -
Slightly lift up the refrigerator door and remove it.
Turn the freezer door upside down on a non-scratch surface.
Loosen the screw to remove the Door Closer/Stop and Hinge
Pin Insert.
Move the Hinge Pin Insert Bracket to the other side of the
door, keeping the same orientation, and move the Hinge Pin
Insert into the hole on the left side of the bracket.
Reverse the Door Closer/Stop by flipping it over. Place it on
top of the Hinge Pin Insert Bracket, and tighten both down with
the screw.
Middle Hinge Bracket
Hinge Pin
Fig. 19
Door Closer / Stop
Fig. 20
Hinge Pin
Insert Bracket
Hinge Pin Insert
Fig. 21
Fig. 22
Pry off the cover on the top left side of the refrigerator to
uncover the screw holes.
Set the freezer door and top hinge parts to the side and
remove the refrigerator door.
REVERSING THE REFRIGERATOR DOOR
Using a ¼” socket wrench, loosen and remove Hinge Pin from
the Middle Hinge Bracket. Remove washer underneath the
middle hinge and set aside.
NOTE: At this point the door will be loose. Slightly lift the door
and remove it.
Cover
(on top of
refrigerator)
Fig. 23
Fig. 29
Fig. 30

- 8 -
Loosen and remove the two bolts and use the Phillips head
screwdriver to remove the Middle Hinge Bracket from the
refrigerator housing. Set parts aside.
Remove the washer from the Bottom Hinge Pin.
Using a ¼” socket wrench, loosen and remove the Hinge Pin
from the Bottom Hinge. Reattach the Hinge Pin to the opposite
side of the hinge.
NOTE: This is easier to do while the hinge is still attached.
Using a 13/32’’ socket wrench with a 2-Inch extension and
screwdriver, loosen the two bolts and one screw, and remove
the Bottom Hinge from right side of the housing.
Fig. 31
Fig. 33
Fig. 32
Remove the Decorative Caps on the bottom of the
refrigerator housing. You will need these holes for the Bottom
Hinge.
Move the Bottom Hinge to the left side of the housing,keeping
the same orientation, and reattach with the two bolts and one
screw. The flat screw must be placed on the exterior side of
the hinge. Move the Decorative Bolt to the hole on the lower
right side of the housing.
Turn the refrigerator door upside down on a nonscratching
surface. Loosen the two screws to remove the Bottom Hinge
Pin Bracket with the Hinge Pin Insert.
Take out the Hinge Pin Insert and move the Bracket to the
other side of the door, keeping the same orientation.
Place the Hinge Pin Insert into the left side of the bracket.
Tighten the Hinge Pin Bracket to the door.
Fig. 34
Fig. 35
Fig. 36
Hinge
Pin Bracket
Hinge Pin
Insert
Fig. 37
Hinge
Pin Bracket
Hinge Pin Insert
Fig. 38

- 9 -
With a flat-head screwdriver, carefully pry off and
remove the cover over the screw holes on the left side of
refrigerator housing.
Remove the outer lower Decorative Screw from the
housing at the area between the freezer and refrigerator
doors. (You will need this hole for the Middle Hinge Bracket).
Flip the Middle Hinge Bracket, (flange will now be on top)
position it on left side of the refrigerator and reattach with two
bolts and a Phillips screwdriver. Place the refrigerator door
down over the pin on the bottom hinge.
Place the washer between the refrigerator door and
middle hinge and re-attach Hinge Pin to Hinge Bracket with a
¼” socket wrench.
NOTE: Bracket has been flipped, but Hinge Pin stays in the
same orientation with its hexagonal end facing upward.
Insert the Decorative Screw into the outer hole on the right
side of the housing. Attach cover on the right side. Cover is
force-fitted.
Fig. 39
Fig. 40
Middle Hinge
Bracket
Flange
Fig. 41
REATTACHING THE DOORS
Place the freezer door down over the Hinge Pin on the Middle
Hinge Pin Bracket.
Place the Upper Hinge Pin on top of the freezer door and line
up the Upper Hinge with holes on top of the refrigerator. Use
the three bolts to replace the Hinge.
Tighten the bolts. Force-fit Top Hinge Cover over Top Hinge.
Replace cover on the top left side of the refrigerator to the right
top to cover the holes. Cover is also force-fitted.
Decorative
Screw
Fig. 42
Fig. 43
Fig. 44
Fig. 45
Cover (on top of
refrigerator)
Fig. 46

- 10 -
After changing the doors, make sure that the
corners of the Door Gaskets are not folded over. To
ensure a good seal, apply a small amount of silicon
grease on the corners of gaskets.
CLOSING AND ALIGNING THE DOORS
To avoid vibration, the unit must be leveled. If necessary,
adjust the Leveling Legs to compensate for unevenness of the
floor. The front should be slightly higher than the rear to aid in
door closing.
Your refrigerator has three front leveling screws, one on the
right and one on the left. If your refrigerator seems unstable or
if you would like the doors to close more easily, simply adjust
the inclination of the refrigerator by following the instructions
below:
NOTE: Third leveling screw is used for protection of hinge
lower.
1. Plug the refrigerator into a 3 prong grounded outlet. Move
the refrigerator into its final position.
2. Use a flat head screwdriver to adjust the leveling screws
(see Figure A), turning clockwise to raise the side of the
refrigerator and counter-clockwise to lower it. It may take
several turns to adjust it to the inclination you would like.
NOTE: Having someone push against the top of the
refrigerator takes some weight off the leveling screws. This will
make it easier to adjust the screws.
3. Open both doors again and check to make sure that they
close easily. If not, tilt the refrigerator slightly more to the rear
by turning both Leveling Screws clockwise. It may take several
more turns, and you should turn both Leveling Screws the
same times.
Corners
Fig. 53
DOOR ALIGNMENT
If the space between your doors is uneven, follow the
instructions below to align the doors.
1. Gently pry off the refrigerator door Top Hinge Cover with a
flat head screwdriver and remove. Loosen the Top Hinge Bolts
using a 10mm or 13/32’’Socket wrench or open-end wrench.
2. Have a second person hold the refrigerator door in its
proper position.
3. Replace the Top Hinge Cover.
3-9 FAN AND FAN MOTOR
1. Remove the freezer shelf. (If your refrigerator has an
icemaker, unplug and remove the icemaker first).
2. Remove the screw of the grille fan.
3. Remove the grille by pulling it out.
4. Remove the Fan Motor assembly by loosening 4 screws
and disassemble the shroud.
5. Pull out the fan and separate the Fan Motor and Bracket.
SHROUD
GRILLE
FAN MOTOR
Fig. 40
FAN
BRACKET

- 11 -
Fig. 44
3-12 CONTROL BOX-REFRIGERATOR
1. First, remove all shelves in the refrigerator. Then 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 left position.
Fig. 43
LED
3-10 DEFROST CONTROL ASSEMBLY
Defrost Control assembly consists of Defrost Sensor and
FUSE–M.
Defrost sensor functions to defrost automatically. It is attached
to metal side of the Evaporator and senses Temperature.
At the temperature of 162°F(72°C), it stops the emission of
heat from the Heater.
Fuse-M is a safety device for preventing over-heating of the
Heater when defrosting.
1. Pull out the grille assembly. (Figure 41).
2. Separate the connector of the Defrost Control assembly and
replace the Defrost Control assembly after cutting the Tie
Wrap. (Figure 42)
3-11 LIGHTS
3-11-1 Freezer Compartment Light(Top)
1. Unplug the power cord from the outlet.
2. Put a flat screwdriver into service hole and remove the
cover of Freezer light.
3. Remove the LED assembly from connector.
4. Replace the LED assembly.
5. Assemble in reverse order of disassembly.
3-11-2 Refrigerator Compartment Light(Side)
1. Unplug the power cord from the outlet.
2. Put a flat screwdriver into service hole and remove the
cover of Refrigerator light.
3. Remove the LED assembly from the connector.
4. Replace the LED assembly.
5. Assemble in reverse order of disassembly.
GRILLE ASSEMBLY DEFROST-CONTROL
ASSEMBLY
Fig. 42Fig. 41

4-2-3 PTC - Applied Circuit Diagram
Starting Method for the Motor
4. COMPRESSOR ELECTRICAL
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-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. If the hermetic connector
rusts out or fails, refrigerant and oil will be expelled into the
contact area, probably resulting in smoke and fire.
(5) When replacing the compressor, be careful that dust,
humidity, and soldering flux don´t contaminate the inside of the
compressor. Contamination in the cylinder 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. During
the starting operation, the PTC allows current flow to both the
start winding and main winding.
COMPRESSOR
ACCESORIES
PTC DIAGRAM
- 12 -
PK
CAPACITOR PART
2
3
5
P.T.C
6
Cr
BL
BK
BL
OLP
PART
COMP' EARTH
GN
(GN)
/YL
M
S
LF, MQ COMP' (e - PTC)
* P.T.C OPTION
3
25
6
4-2-6 Motor Restarting and PTC
(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.
4-2-7 Relation of PTC-Starter
(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.

4-2-8 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.
Customer part
number
Lot code/
date code
330 FBYY -S1 BOX98
12345678
Physical
termination
part number
Electrical
characteristics
part number
(OVERLOAD PROTECTOR cross section)
Fig. 45
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 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 anyway.
- 13 -

5. CIRCUIT DIAGRAM
- 14 -

6. TROUBLESHOOTING
- 15 -
6-1 COMPRESSOR AND ELECTRIC COMPONENTS
1
2
3
4
5
2
5
5
3
5
1
43
YES
NO
YES
Open or short
YES YES
NO
NO
Power Source.
No voltage.
(Rated voltage
±10%)?
Replace OLP.
Reconnect.
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
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.
Replace
compressor
Check
resistance of
motor
compressor.
The resistance between pins should be
between 1 and 50 ohms. The resistance to
ground should be infinite.
or short to
ground
Check the resistance
between M-C, S-C and M-S
in motor compressor.
Check each pin to ground.
Check resistance of
two terminals in
PTC-Starter
At normal temperature
6.8 +20: OK?
If power conducts: OK
If not: NG

- 16 -
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 1)
Observation value is
115V/60Hz : 6.8?±20%
The resistance value
is 0 ?(short) or
Check another
electric component.
Replace OLP.
Replace PTC-
Starter.
Figure 1 Figure 2
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 2)
?
at room temperature 25 c
8.2 ? at 25 c

- 17 -
• Not cooling at all
• Poor cooling performance
Compressor
doesn't run.
Compressor runs
poorly.
Check a 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.
Raise voltage.
Replace
indicated component.
Cause
Check voltage at
starting devices.
Check current at
Compressor.
Check rating of OLP.
Fan motor
doesn't run.
Heavy frost buildup on
EVAPORATOR.
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 ELECTRIC COMPONENTS

6-4 SERVICE DIAGNOSIS CHART
- 18 -
COMPLAINT SYMPTOM POSSIBLE CAUSES SOLUTION
1. Supply voltage not within specifications 1. Check supply voltage to refrigerator
2. Open in wiring harness from PWB board 2. Chack wiring and connectors to PWB board
3. Open in door monitor switch circuit 3. Check door monitor circuit
1. Supply voltage not within specifications 1. Check supply voltage to refrigerator
2. Open wiring harness from PWB board 2. Chack wiring and connectors to PWB board
1. Compressor not operating 1. Check for compressor operation by using the test
key on main circuit board.
2. Open in compressor circuit 2. Check for open on OLP, PTC, compressor, wiring.
1. Condenser fan motor not operating 1. Check condenser fan motor and wiring circuit
2. Condenser coils blocked 2. Check air flow across condenser
3. Evaporator fan motor not operating 3. Check evaporator fan motor and wiring circuit
4. Internal air flow blocked 4. Check air ducts
5. Sensor not operating properly 5. Check refrigerator and freezer sensors
6. Door not sealing 6. Check for proper door seal
7. Evaporator frosted up 7. Check defrost circuit components
8. Sealed system related problem
1. Open in defrost circuit 1. Check defrost heater and circuit using Test Key
2. Defrost sensor not operating correctly 2. Check sensor
3. Defrost drain clogged 3. Check drain
1. Freezer has too
much frost
1. Display on
compressor is
operating
1. No Display at all
2. Partial or
abnormal display
1. Display on but
compressor not
operating
Electronic Display not
operating correctly
Not cooling
Not cold enough
Not defrosting

6-5 REFRIGERATING CYCLE
- 19 -
• Troubleshooting Chart
Leakage Detection
PARTIAL Freezer Low flowing sound of A little higher • Refrigerant level is low due
LEAKAGE compartment and Refrigerant is heard and than ambient to a leak.
Refrigerator don't frost forms in inlet only. temperature. • Normal cooling is possible by
cool normally. restoring the normal amount of
• Refrigerant and repairing the leak.
COMPLETE Freezer Flowing sound of refrigerant Equal to ambient • No discharging of Refrigerant.
LEAKAGE compartment and is not heard and frost isn't temperature. • Normal cooling is possible by
Refrigerator don't formed. restoring the normal amount of
cool normally. refrigerant and repairing the leak.
PARTIAL Freezer Flowing sound of refrigerant A little higher • Normal discharging of the
RESTRICTION compartment and is heard and frost forms than ambient refrigerant.
Refrigerator don't in inlet only. temperature. • The capillary tube is faulty.
cool normally.
WHOLE
Freezer Flowing sound of refrigerant Equal to ambient • Normal discharging of the
RESTRICTION
compartment and is not heard and frost isn't temperature. refrigerant.
Refrigerator don't cool. formed.
MOISTURE Cooling operation Flowing sound of refrigerant Lower than • Cooling operation restarts
RESTRICTION stops periodically. is not heard and frost melts. ambient when heating the inlet of the
temperature. capillary tube.
COMP- Freezer and Low flowing sound of A little higher • Low pressure at high side
RESSION Refrigerator refrigerant is heard and ambient of compressor due to low
don't cool. frost forms in inlet only. temperature. refrigerant level.
NO COMP- No compressing Flowing sound of refrigerant Equal to ambient • No pressure in the high
RESSION operation. is not heard and there is temperature. pressure part of the
no frost. compressor.
CAUSE
TEMPERATURE
OF THE
COMPRESSOR
REMARKS
STATE OF
THE UNIT
STATE OF THE
EVAPORATOR
LEAKAGE
RESTRICTION
DEFECTIVE
COMPRESSION
Check sealed system for leak.
Check if compressor runs.
(If don’t , wait a while until it start to work)
YES Check frost pattern on Evaporator.
(Eva In, Eva Out)
If frost is formed normally
Only check that there is not any
hole or bad welding in Eva in-Eva
out.
No frost or frost forms
in inlet only
Check for oil leak on high
side (Machinery Room)
Gas leakage
Repair it.
YES
Confirm refrigerant
amount
None or too much.
Recharge refrigerant
(check correct quantity)
Finished OK
Frost formed
normally
Moisture restriction.
intermittent problem. Replace
Compressor
Faulty
Compressor
Normal Amount
Restriction
No frost
normally
Frost formed
normally

7-1 OPERATION PRINCIPLE
7-1-1 Operation Principle of Icemaker
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.
Power (On/Off) Switch
Water amount
control button
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, insert pin at hole
.located at front, press internal button and hold 3 seconds
Harvest Fill Icemaking.
• With the detect lever, checks if the ICE BIN is full.
Power On
• Adjusts Ejector to Start Position whit power on.
- 20 -
7. ICE MAKER
OPERATION PRINCIPLE AND REPAIR METHOD OF ICEMAKER
The icemaking will run through 3 stages: