LG LRTN22310, LRTN19310 User Manual

CAUTION

BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

REFRIGERATOR

SERVICE MANUAL

models

LRTN19310

**

LRTN22310

**

CONTENTS

SAFETY PRECAUTIONS ....................................................................................................................................................... 2

SPECIFICATIONS................................................................................................................................................................... 3

PARTS IDENTIFICATION....................................................................................................................................................... 4

DISASSEMBLY.................................................................................................................................................................... 5-6

DOOR................................................................................................................................................................................... 5

DOOR SWITCH.................................................................................................................................................................... 5

FAN AND FAN MOTOR........................................................................................................................................................ 6

DEFROST CONTROL ASSEMBLY...................................................................................................................................... 6

LAMP.................................................................................................................................................................................... 6

CONTROL BOX-REFRIGERATOR...................................................................................................................................... 6

ADJUSTMENT..................................................................................................................................................................... 7-8

COMPRESSOR.................................................................................................................................................................... 7

PTC-STARTER..................................................................................................................................................................... 7

OLP (OVERLOAD PROTECTOR) ....................................................................................................................................... 8

TO REMOVE THE COVER PTC...........................................................................................................................................8

CIRCUIT DIAGRAM................................................................................................................................................................ 9

TROUBLESHOOTING..................................................................................................................................................... 10-15

COMPRESSOR AND ELECTRICAL COMPONENTS ....................................................................................................... 10

PTC AND OLP.................................................................................................................................................................... 11

OTHER ELECTRICAL COMPONENTS ............................................................................................................................. 12

SERVICE DIAGNOSIS CHART.......................................................................................................................................... 13

REFRIGERATION CYCLE............................................................................................................................................ 14-15

DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM ............................................................................................... 16-25

EXPLODED VIEW & REPLACEMENT PARTS LIST ......................................................................................................... 26-

SAFETY PRECAUTIONS

Please read the following instructions before servicing your
refrigerator.

1. Check the refrigerator for electrical faults.

2. To prevent electric shock, unplug before servicing.

3. Always check line voltage and amperage.

4. Use standard electrical components or cause your skin
to freeze and stick to the surfaces inside the freezer.

5. Don't touch metal products in the freezer with wet
hands. This may cause frostbite.

6. Prevent water from spiling onto electric elements or the
machine parts.

- 2 -

7. Close the top door before opening the bottom door.
Otherwise, you might hit your head when you stand up.

8. When tilting the refrigerator, remove any materials on
the refrigerator, especially the glass shelves and stored
food.

9. When servicing the evaporator, wear cotton gloves.
This is to prevent injuries from the sharp evaporator
fins.

10. Service on the refrigerator should be performed by a
qualified technician. Sealed system repair must be
performed by a CFC certified technician.

1. SPECIFICATIONS

Ref. No.: 19Cuft / 22Cuft

ITEMS SPECIFICATIONS

DOOR DESIGN Slide Rounded

755 X 806

DIMENSIONS (mm)

NET WEIGHT (kg)

COOLING SYSTEM Fan Cooling

TEMPERATURE CONTROL Micom Control

DEFROSTING SYSTEM

DOOR FINISH VCM

HANDLE TYPE Bar

INNER CASE ABS Resin

INSULATION Polyurethane Foam

X 1664 (W X D X H

831

X 806 X 1715 (W X D X H

91 (19 cu.ft)

101 (22 cu.ft)

Full Automatic

Heater Defrost

) - 19 Cu.ft

) - 22 Cu.ft

ITEMS SPECIFICATIONS

VEGETABLE TRAY Opaque Drawer Type

COMPRESSOR PTC Starting Type

EVAPORATOR Fin Tube Type

CONDENSER Wire Condenser

REFRIGERANT R-134a (155 g)

LUBRICATING OIL Freol@10G (310 cc)

DEFROSTING DEVICE SHEATH HEATER

LAMP REFRIGERATOR 60 W (1EA)

- 3 -

2. PARTS IDENTIFICATION

FREEZER

COMPARTMENT

REFRIGERATOR

COMPARTMENT

Ice Bin

Freezer Shelf

Digital Sensor

Control

Snack Corner

Shelves

Crisper

Keeps fruits

and vegetables

fresh and crisp.

Freezer Door Bin

Door Bin

Egg Tray

Refrigerator Door
Rack

Base Grille

Can Dispenser

Dairy Bin

- 4 -

3. DISASSEMBLY

BOLT

HINGE

HINGE COVER

GASKET

LOWER HINGE

BOLT

DOOR SWITCH

LEAD WIRE

3-1 DOOR

● Freezer Door

1. Remove the hinge cover by pulling it upwards.

2. Loosen hexagonal bolts attaching the upper hinge to the
body and lift the freezer door.

Figure 1

3. 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.

Figure 4

Figure 2

● Refrigerator Door

1. Loosen hexagonal bolts attaching the lower hinge to the
body to remove the refrigerator door only.

Figure 3

2. Pull out the door gasket to remove from the door foam
assembly.

- 5 -

3-3 FAN AND FAN MOTOR

FAN

BRACKET

SHROUD

GRILLE

FAN MOTOR

GRILLE ASSEMBLY

DEFROST-CONTROL
ASSEMBLY

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 4 screws
and disassemble the shroud.

4. Pull out the fan and separate the Fan Motor and Bracket.

3-5 LAMP

Figure 8

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-1EA).

3-4 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 6)

2. Separate the connector with the Defrost Control
assembly and replace the Defrost Control assembly
after cutting the Tie Wrap. (Figure 7)

Figure 5

3-6 CONTROL BOX-REFRIGERATOR

1. First, remove all shelves in the refrigerator, than remove
the Refrigerator Control Box by loosening 2 screws.

CONTROL BOX

COVER LAMP

2. Remove the Refrigerator Control Box by pulling it
downward.

3. Disconnect the lead wire on the right position and
separate the lamp sockets.

Figure 9

Figure 6

Figure 7

- 6 -

4. ADJUSTMENT

PTC STARTER

SEALED
TERMINAL

COMPRESSOR
MOTOR

C

M

S

M

3

6

5

2

S

PTC

OVERLOAD PROTECTOR

RSCR

N

L1

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 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 or
improper operation 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 BaTiO

(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.

3.

4-2-3 PTC-Applied Circuit Diagram

● Starting Method for the Motor

Figure 10

4-2-4 Motor Restarting and PTC Cooling

(1) It requires approximately 5 minutes for the pressure to

equalize before the compressor can start.

(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.

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.

- 7 -

4-3 OLP (OVERLOAD PROTECTOR)

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)

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.

1

Figure 11

(3) Remove two Housings on upper part of Cover PTC.

(4) Take out the cover PTC from upper to lower position

like .

2

(5) Turn 45° in the direction of  and take it out.

(6) Assembly in reverse order of disassembly.

- 8 -

5. CIRCUIT DIAGRAM

GOOD MODEL

- 9 -

6. TROUBLESHOOTING

Readings OK

Open or short

1

2

3

4

5

2

5

5

3

5

4

5

5

1

43

YES

YES

Readings OK

Readings OK

Open or short

Open or short

YES YES

NO

NO

6-1 COMPRESSOR AND ELECTRIC COMPONENTS

Power Source.

Check
resistance of
Motor
Compressor.

Remove PTC-Starter
from Compressor and
measure voltage
between Terminal C of
Compressor and
Terminals 5 or 6 of PTC.

No Voltage.

Applied voltage isn't
in range of Rating
Voltage ±10%.

Check resistance
between M-C, S-C and
M-S in Motor
Compressor.

Check
resistance of
PTC-Starter.

Check resistance of
two terminals in
PTC-Starter.

Check OLP.

Check resistance of
two terminals in OLP.

(Reated Voltage
±10%)?

OLP disconnected?

Advise customer that
power supply needs to be
checked by an electrician.

Replace
Compressor.

Replace OLP.

Check connection
condition.

Reconnect.

Replace
PTC-Starter.

Replace OLP.

Check
starting state.

Check the power supply
under load.
(Compressor attempting
to re-start after being off
for 5 minutes).

Supply
voltage
rating with
±10%.

Did
compressor
start?

- 10 -

Compressor
is OK

Replace the
compressor

6-2 PTC AND OLP

65

Shows continuity

Open

Normal operation of
Compressor is
impossible or poor.

Separate PTC-Starter
from Compressor and
measure resistance
between No. 5 and 6
of PTC-Starter with a
Tester.(Figure 12)

Separate OLP from
Compressor and check
resistance value
between two terminals
of OLP with a Tester.
(Figure 13)

Observation value is
115V/60Hz : 6.8Ω±30%

The resistance value
is 0Ω (short) or
∞ (open).

Check another
electric component.

Replace OLP.

Check another
electric component.

Replace PTC­Starter

Figure 12

Figure 13

- 11 -

6-3 OTHER ELECTRIC COMPONENTS

▼ Not cooling at all

Compressor
doesn't run.

▼ Poor cooling performance

Compressor runs
poorly.

Check for open short or
incorrect resistance readings
in the following components

a. Starting devices

b. OLP

c. Compressor coil

d. Wiring harness

Check a starting
voltage.

Check voltage at
starting devices.

Check current at
Compressor.

Cause

Short, open or broken.

Poor contact
or shorted.

Coil open or shorted.

Poor contact
or shorted.

Low voltage.

Poor or broken or
open contact.

Shorted.

Replace
indicated component.

Raise voltage.

Replace
indicated component.

Fan motor
doesn't run.

Heavy frost buildup on
EVAPORATOR.

Check rating of OLP.

Check wiring circuit.

Check Fan Motor.

Check current flow in
the following
components:
sensor
Fuse-M

Check current flow in
the Defrost Heater.

Lack of capacity.

Wire is open or
shorted.

Coil is shorted or
open.

Open.

Open.

Replace
indicated component.

Replace
indicated component.

Replace
Defrost Heater.

- 12 -

6-4 SERVICE DIAGNOSIS CHART

COMPLAINT POINTS TO BE CHECKED REMEDY

No Cooling.

Cools poorly.

Foods in the
Refrigerator
are frozen.

Condensation or ice
forms inside
the unit.

Condensation forms
in the Exterior Case.

There is abnormal
noise.

• 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 to Warm 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 Drip Tray is not firmly fixed.

• Check if the cover of the compressor enclosure

in the lower front side is taken out.

• Plug into the outlet.

• Set the switch to ON.

• Replace the fuse.

• If the voltage is low, correct the wiring.

• Place the unit about 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 to Warm-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

in a firm place.

• Remove the objects.

• Fix the Drip Tray firmly in the original position.

• Place the cover in its original position.

Door does not
close well.

Ice and foods
smell unpleasant

● Other possible problems:

Check if frost forms in
the freezer.

Check the
refrigeration system.

Check the
Thermistor.

• 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.

Not
defrosting.

The system
is faulty.

The operation of
the Thermistor is
incorrect.

• 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.

Check Components
of the defrosting
circuit.

Perform sealed
system repair.

Replace the
Thermistor.

- 13 -

6-5 REFRIGERATING CYCLE

YES

YES

▼ Troubleshooting Chart

CAUSE

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.

LEAKAGE

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

RESTRICTED BY DUST

PARTIAL Freezer Flowing sound of refrigerant A little higher • Normal discharging of the
RESTRICTION

WHOLE
RESTRICTION

MOISTURE Cooling operation Flowing sound of refrigerant Lower than • Cooling operation restarts
RESTRICTION

COMPRESSION

COMP- Freezer and Low flowing sound of A little higher • Low pressure at high side

DEFECTIVE

RESSION Refrigerator refrigerant is heard and ambient • of compressor due to low

STATE OF

THE UNIT

Refrigerator don't frost forms in inlet only. temperature. • Normal cooling is possible by
cool normally. • restoring the normal amount of

Refrigerator don't formed. • restoring the normal amount of
cool normally. • refrigerant and repairing the leak.

compartment and is heard and frost forms than ambient • refrigerant.
Refrigerator don't in inlet only. temperature. • The capillary tube is faulty.
cool normally.

Freezer
compartment and
Refrigerator don't cool.

stops periodically. is not heard and frost melts. ambient • when heating the inlet of the

don't cool. frost forms in inlet only. temperature. • refrigerant level.

STATE OF THE

EVAPORATOR

Flowing sound of refrigerant Equal to ambient • Normal discharging of the
is not heard and frost isn't temperature. • Refrigerant.
formed.

TEMPERATURE

OF THE

REMARKS

COMPRESSOR

• refrigerant and repairing the leak.

temperature. • capillary tube.

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.

▼ Leakage Detection

● Observe the discharging point of the refrigerant, which may be in the oil discharging part of the compressor and in a hole

in the evaporator.

Check if compressor
runs.

Frost formed normally

Moisture Clog

Faulty
Compressor.

Check Compressor

Check if frost
forms in
Evaporator.

Normal amount

Clogged by dust. Gas leakage.

No frost
or frost forms
in inlet only

Observe the discharged
amount of Refrigerant.

Inject refrigerant in compressor
and check cooling operation.

Frost formed normally

Check if oil
leaks.

None or too much

(Find the leak and repair it)

- 14 -

▼ General Control of Refrigerating Cycle

NO. ITEMS UNIT STANDARDS PURPOSES REMARKS

Pipe and

1

piping system
opening time

Welding

2

N

2

3

parts

Refrige-

4

ration
Cycle

sealed

Evacuation
time

Vacuum
degree

Vacuum

Vacuum
piping

Min.

Nitrogen
pressure

Confirm
N

2 leak

Min.

Torr

EA

EA

Pipe: within 1 hour.
Comp: within 10 minutes.
Drier: within 20 minutes.

Weld under Nitrogen
atmosphere.
(N

2 pressure:

0.1~0.2 kg/cm

2

)

Confirm the sound of
pressure relief when
removing the rubber cap.
Sound: usable
No sound: not usable

More than 40 minutes

Below 0.03 (ref)

High and low pressure sides
are evacuated at the same
time for models above 200 l.

Use R-134a manifold
exclusively.

To protect
moisture
penetration.

To protect oxide
scale formation.

To protect
moisture
penetration.

To remove moisture.

To protect mixing
of mineral and
ester oils.

The opening time should be reduced
to a half of the standards during rain
and rainy seasons (the penetration of
water into the pipe is dangerous).

- Refer to repair note in each part.

- R-134a refrigerant is more
susceptible to leaks than R-12 and
requires more care during welding.

-

Do not apply force to pipes before and
after welding to protect pipe from cracking.

- In case of evaporator parts, if it doesn't
make sound when removing rubber
cap, blow dry air or N

2 gas for more

than 1 min. and than use the parts.

Note: Only applicable to the model

equipped with reverse flow
protect plate.

Vacuum efficiency can be improved
by operating compressor during
evacuation.

The rubber pipes for R-12 refrigerant
will be melted when they are used for
R-134a refrigerant (causes of leak.)

Refrigerant

5

weighing

Drier

6

replacement

Leak check

7

Pipe
coupler

Outlet
(Socket)

Plug

EA

EA

Use R-134a manifold
exclusively.

R-134a manifold exclusively.

R-134a manifold exclusively.

Use R-134a exclusively.
Weighing allowance: ±5g
Note: Winter: -5g

Summer: +5g

- Use R-134a exclusively for
R-134a refrigerator.

-

Replace drier whenever repairing
refrigerator cycle piping.

- Do not use soapy water for
check. It may be sucked
into the pipe by a vacuum.

To protect R-12
refrigerant mixing.

To protect R-12
refrigerant mixing.

To protect R-12
refrigerant mixing.

Do not mix with
R-12 refrigerant.

To remove the
moisture from
pipe inside.

Defect in
refrigerant leak
area.

- Do not weigh the refrigerant at too
hot or too cold an area.
(77°F [25°C] is adequate.)

- Make Copper charging canister
(Device filling refrigerant)
Socket: 2SV Plug: 2PV R-134a
Note: Do not burn O-ring (bushing)

during welding.

- Check for an oil leak at the refrigerant
leak area. Use an electronic leak
detector if an oil leak is not found.

- The electronic leak detector is very
sensitive to halogen gas in the air. It
also can detect R-141b in urethane.
Practice many times before using this
type of detector to avoid false readings.

- 15 -

7. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM

WARMER COLDER

12345

TEMPERATURE

ADJUST

7-1 FUNCTION

7-1-1 Function

1. When the appliance is plugged in, it is set to "3" for the Refrigerator.
You can adjust the Refrigerator control temperature by pressing the ADJUST button.

2. When the power is initially applied or restored after a power failure, it is automatically reset to "3".

7-1-2 Defrost Cycle

1. A defrost cycle will be initiated after 4 hours of accumulated compressor run time after the initial power up or a power
failure.

2. After the initial defrost, the defrost cycle is initiated after 7 hour of accumulated compressor run time.

3. The defrost cycle will be terminated once the defrost sensor reaches 50°F(10°C).

7-1-3 Electrical Parts Operates in Orders

Electrical parts such as COMP, defrost heater, freezer FAN, etc. operate 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.

OPERATING ORDERS

Temperature of Defrost
Sensor is 113°F(45°C) or
more (when unit is newly

Initial power on

purchased or when moved)

Temperature of defrost
sensor is lower than
113 °F(45°C) (when power
cuts, SERVICE)

POWER

ON

POWER

ON

in 1/2 second

in 1/2 second

in 1/2 second

COMP &

Freezer FAN

COMP &

Freezer FAN

ON

Defrost

heater ON

in 10 second

Defrost

heater OFF

ON

Reset to normal operation
from TEST MODE

Total load

OFF

in 7 minute

COMP &

Freezer FAN

ON

- 16 -

7-1-4 Defect Diagnosis Function

WARMER COLDER

12345

TEMPERATURE

ADJUST

Defect code panel

1. Defect diagnosis functions are easy SVC when defects occur which can affect product performance.

2. When a defect occurs, the buttons will not operate; but the tones. such as "ding". will sound.

3. When the defect CODE removes the sign, it returns to normal operation (RESET).

4. The defect CODE shows on the refrigerator DISPLAY as temperature LED, and the other LED turns off.

- ERROR CODE on Refrigerator Temperature panel

NO ITEM

Refrigerator sensor

1

2

3

4

malfunctions

Defrost sensor

malfunctions

Room

Temperature

sensor

malfunctions

Defrosting

malfunctions

DEFECT SIGNS

R1 R2 R3 R4 R5

CONTENTS REMARKS

Open or short-circuited wire

Open or short-circuited wire

Open or short-circuited wire

2 hours after
defrosting starts,
the sensor is not

above 50°F(10°C)

Temperature FUSE cuts off,

HEATER cuts off, DRAIN is

clogged, HEATER starts,

RELAY malfunctions

:ON :OFF

Inspect

*

connecting wires

on each sensor

- 17 -

7-1-5 TEST Mode

1. The Test mode allows checking the PCB and the function of the product as well as finding out the Defective part in case
of an error.

2. The test button is on the main PCB of the refrigerator (Test S/W). The test mode will be cleared in 2 hours regardless of
the type of test mode.

3. While in the test mode, the ADJUST button will not operate.

4. After exiting the test mode, be sure to reset by unplugging and then plugging in the appliance.

5. If an error (such as a sensor failure) is detected while in the test mode, the test mode is cleared and the error code is
displayed.

6. While an error code is displayed, the test mode will not be activated even if the test button is pushed.

MODE MANIPULATION CONTENTS REMARKS

TEST1

TEST2

Reset

Push the test button
once.

Push the test button
once while in
TEST MODE 1.

Push the test button
once while in
TEST MODE 2.

1. Continuous operation of the COMP

2. Continuous operation of the freezer fan

3. Defrosting Heater OFF

4. Every DISPLAY LED ON

1. COMP OFF

2. Freezer FAN OFF

3. Defrosting heater ON

4. 1, 3, 5 LED ON

Reset to the default setting

Reset if the
temperature of the
Defrosting sensor is
50°F(10°C) or more.

The compressor will
Start after a 7-minute
delay.

- 18 -

7-2 PCB FUNCTION

7-2-1 Power Circuit

1. Power is supplied to the control board at pins 1 and 5 of connector #4.

- 19 -

7-2-2 Load / Buzzer Drive & Open Door Detection Circuit

1. Load Drive Condition Check

To measure outputs of the control board, check voltages between the pins for the following components:

Circuit Pin Number Pin Number Output Voltage

Compressor Con1 pin1 Con4 pin1 115 VAC

Condenser fan Con1 pin1 Con4 pin1 115 VAC

Evaporator fan Con1 pin1 Con4 pin1 115 VAC

Defrost heater Con1 pin3 Con4 pin1 115 VAC

F,R-lamp Con1 pin5 Con4 pin1 115 VAC

NOTE: When the door of the freezer/refrigerator is left open for 7 minutes or longer, the lamp of the freezer/refrigerator turns

off automatically.

- 20 -

2. Open Door Circuit (Door Monitor Circuit)

Freezer or Refrigerator Measurement between pins 5 and 6 at Con 3

Both Closed 0 volts

One door open 5 volts

- 21 -

7-2-3 Temperature Sensor Circuit

Voltage supplied to each sensor wil range between 0.5 volts -22°F(-30°C) and 4.5 volts 122°F(50°C) depending upon the
temperature in the compartments. A measurement of 0 volts indicates a short in the sensor circuit. A measurement of 5
volts indicates an open in the sensor circuit.

- 22 -

7-3 RESISTANCE SPECIFICATION OF SENSOR

TEMPERATURE RESISTANCE OF FREEZER RESISTANCE OF REFRIGERATOR

- 20 ˚C (-4 °F) 22.3 KΩ 77 KΩ

- 15 ˚C (5 °F) 16.9 KΩ 60 KΩ

- 10 ˚C (14 °F) 13.0 KΩ 47.3 KΩ

- 5 ˚C (23 °F) 10.1 KΩ 38.4 KΩ

0 ˚C (32 °F) 7.8 KΩ 30 KΩ

+ 5 ˚C (41 °F) 6.2 KΩ 24.1 KΩ

+ 10 ˚C (50 °F) 4.9 KΩ 19.5 KΩ

+ 15 ˚C (59 °F) 3.9 KΩ 15.9 KΩ

+ 20 ˚C (68 °F) 3.1 KΩ 13 KΩ

+ 25 ˚C (77 °F) 2.5 KΩ 11 K Ω

+ 30 ˚C (86 °F) 2.0 KΩ 8.9 KΩ

+ 40 ˚C (104 °F) 1.4 KΩ 6.2 KΩ

SENSOR & DEFROST SENSOR

+ 50 ˚C (122 °F) 0.8 KΩ 4.3 KΩ

• The resistance of the SENSOR has a ±5% common difference.

• Measure the resistance of the SENSOR after leaving it for over 3 minutes in the measuring temperature.

This delay is necessary due to sensor response speed.

• Measure the F-SENSOR, SUPER FROST SENSOR, R1, R2-SENSOR after disconnect CON5 of PWB ASSY, MAIN.

- 23 -

Not defrosting

Not cold enough

Not Cooling

not operating

correctly

Electronic Display

COMPLAINT

7-4 TROUBLESHOOTING

1. Frosted up in

Freeer

4. Damper not opening or internal air flow blocked

5. Sensor not operating properly

6. Door not sealing

7. Evaporator Frosted up

1. Open in defrost circuit

2. Defrost sensor not operating correctly

3. Defrost drain clogged

8. Sealed System related problem

2. Display on

compressor is

operating

1. Condenser fan motor not operating

2. Condenser coils blocked

3. Evaporator fan motor not operating

operating

1. Display on but

compressor not

1. Compressor not operating

2. Open in compressor circuit

2. Partial or

abnormal display

1. Supply voltage not within specifications

2. Open in wiring harness from PWB board

3. Open in door monitor switch circuit

1. No Display at all

SYMPTOM POSSIBLE CAUSES SOLUTION

1. Supply voltage not within specifications

2. Open in wiring harness from PWB board

1. Check defrost heater and circuit using Test Key

2. Check sensor

3. Check drain

7. Check defrost circuit components
wiring, etc.

1. Check condenser fan motor and wiring circuit

2. Check air flow across condenser

3. Check evaporator fan motor and wiring circuit

4. Check damper motor circuit

5. Check refrigerator and freezer sensors

6. Check for proper door esal

1. Check supply voltage to refrigerator

2. Check for open on OLP, PTC, compressor,

1. Check for compressor operation by using the test

key on main circuit board

2. Check wiring and connectors to and from PWB

board

3. Check door monitor circuit

1. Check supply voltage to refrigerator

2. Check wiring and connectors to PWB board

- 24 -

7-5 MAIN PWB ASSEMBLY AND PARTS LIST

7-5-1 Main PWB Assembly

- 25 -

8. EXPLODED VIEW & REPLACEMENT PARTS LIST

106A

106A

315A

401A

304A

501A

411A

410G

501F

S01

309A

318A

308A

S07

314A

307A

312A

317A

S06

S09

310A

327A

103A

105A

301A

283E

103B

328A

145B

145A

282H

B02

S13

282B

406B

418A

281A

B01

281B

103C

305B

305B

305C

305C

B03

S19

S38

105F

S10 S10

B04

323B

329C

420A

319A

S08

319C

282E

S02

S05

S04

283B

S14

120A

S17

120B

113D

113B

113C

409B

158A

S16

113A

503C

503D

CASE PARTS

CAUTION: Use the part number to order part, not the position number.

- 26 -

FREEZER PARTS

405C

404A

405A

S20

330B

S21

332A

149A

149B

284C

284A

329A

110D

S22

147B

125A

131A

CAUTION: Use the part number to order part, not the position number.

- 27 -

REFRIGERATOR PARTS

128A

170A

141B

141C

141A

141B

141C

141A

141C

141A

141B

141B

141C

141A

141C

141A

141B

154A

167B

151A

155B

151A

151C

128B

CAUTION: Use the part number to order part, not the position number.

- 28 -

DOOR PARTS

241C

241C

205D

233A

203A

200A

201A

231A

281D

281D

281E

281E

234B

244A*

S25*

S25*

244B*

S25*

212A*

S25*

S25*

S25*

210A

S26

210B

201A

281D

281E

244B*

212A*

607A*

607A*
244C*

243A

283F

231A

281D

281E

S27

244B*

244A*

607A*

607A*
244C*

230A

S25*

S25*

S25*

S25*

205D

241C

241A

241D

241B

CAUTION: Use the part number to order part, not the position number.

: on some models

*

- 29 -

P/No. 3828JL8015A MAR., 2003 Printed in Korea