LG LRSPC2661xx Service Manual

CAUTION

PLEASE READ CAREFULLY THE SAFETY PRECAUTIONS IN THIS BOOK
BEFORE SERVICING OR OPERATING THE REFRIGERATOR.

MODEL: LRSPC2661T

COLOR: TITANIUM

REFRIGERATOR

SERVICE MANUAL

http://biz.lgservice.com

Ref. No.
GR-D267DTU

WARNINGS AND PRECAUTIONS FOR SAFETY ................................................................................................................ 3

SPECIFICATIONS................................................................................................................................................................... 4

PARTS IDENTIFICATION....................................................................................................................................................... 5

HOW TO INSTALL THE REFRIGERATOR............................................................................................................................ 6

HOW TO ADJUST DOOR HEIGHT OF THE REFRIGERATOR.......................................................................................... 6

HOW TO INSTALL WATER PIPE......................................................................................................................................... 7

HOW TO CONTROL THE AMOUNT OF WATER SUPPLIED TO THE ICEMAKER........................................................... 8

COOLING CYCLE AND REFRIGERANT............................................................................................................................. 10

FUNCTIONS AND OPERATION PRINCIPLES OF MAIN PARTS....................................................................................... 12

COMPRESSOR (RECIPROCATING TYPE)...................................................................................................................... 12

OVER LOAD PROTECTOR............................................................................................................................................... 12

POSITIVE TEMPERATURE COEFFICIENT (PTC)............................................................................................................ 12

SWITCH (DOOR, HOME BAR, DISPENSER)................................................................................................................... 13

MOTOR.............................................................................................................................................................................. 14

SOLENOID......................................................................................................................................................................... 14

HEATER............................................................................................................................................................................. 15

VALVE................................................................................................................................................................................. 17

ICEMAKER AND DISPENSER OPERATION PRINCIPLE AND REPAIR METHOD........................................................... 18

MICOM FUNCTION .............................................................................................................................................................. 24

EXPLANATION FOR MICOM CIRCUIT .............................................................................................................................. 32

CIRCUIT................................................................................................................................................................................ 52

PROBLEM DIAGNOSIS ....................................................................................................................................................... 53

PROBLEM SHOOTING...................................................................................................................................................... 53

FAULTS .............................................................................................................................................................................. 63

COOLING CYCLE HEAVY REPAIR................................................................................................................................... 80

HOW TO DEAL WITH CLAIMS.......................................................................................................................................... 87

HOW TO DISASSEMBLE AND ASSEMBLE(REFRIGERATOR SECTION) ....................................................................... 92

DOOR................................................................................................................................................................................. 92

HANDLE............................................................................................................................................................................. 93

DEODORIZER.................................................................................................................................................................... 93

SHROUD, GRILLE FAN..................................................................................................................................................... 94

CONTROL BOX, R............................................................................................................................................................. 94

CASE PWB......................................................................................................................................................................... 94

ICEMAKER ASSEMBLY..................................................................................................................................................... 95

DISPENSER....................................................................................................................................................................... 96

WATER TANK AND WATER LINE...................................................................................................................................... 97

DIGITAL SECTION LAYOUT................................................................................................................................................ 98

DIGITAL PARTS MANUAL................................................................................................................................................. 101

TROUBLESHOOTING FOR THE DIGITAL FUNCTION SECTION................................................................................... 122

EXTERNAL EXTENSION PORT ........................................................................................................................................ 131

HOW TO DISASSEMBLE AND ASSEMBLE(DIGITAL SECTION) ................................................................................. 132

EXPLODED VIEW .............................................................................................................................................................. 136

DIGITAL SECTION COMPONENTS .................................................................................................................................. 144

REPLACEMENT PARTS LIST .......................................................................................................................................... 146

CONTENTS

- 2 -

Please observe the following safety precautions in order to
safely and properly use the refrigerator, to avoid hazards,
and prevent accidents during repair.

1. Avoid the risk of electric shock. Disconnect power cord
from wall outlet and wait for more than three minutes
before replacing PWB parts. Shut off the power
whenever replacing and repairing electric components.

2. When connecting power cord, make sure that the power
cord has been disconnected from the wall outlet for at
least five minutes.

3. Check for damage to the power cord and plug. If the
power cord or plug is damaged, it could cause a fire or
electric shock.

4. The refrigerator should have its own individual electrical
outlet. Overloading any outlet can cause a fire.

5. Please make sure the outlet is properly grounded,
particularly in a wet or damp area.

6. Use standard electrical components when replacing
parts.

7. Make sure water connection is correctly engaged.
Remove dust and foreign materials from the housing
and connecting parts.

8. Do not fray, damage, machine, heavily bend, yank, or
twist the power cord.

9. Check for evidence of moisture intrusion in the
electrical components. Replace the parts or mask them
with insulation tape if moisture intrusion is evident.

10. Do not touch the Icemaker with hands or tools to
confirm the operation of geared motor.

11. Do not let the customer repair, disassemble, or

reconstruct the refrigerator for themselves. Servicing
carries the risk of electric shock, fire and other hazards.

12. Do not store hazardous materials such as ether,
benzene, alcohol, chemicals, gas, or medicine in the
refrigerator.

13. Do not put flower vases, cups, cosmetics, chemicals,
etc., or container with fall of liquid on the top of the
refrigerator.

14. Do not put glass bottles full of liquid into the freezer.
The contents could freeze and break the glass bottles.

15. When scrapping the refrigerator, please disconnect the
door gasket first, and scrap the refrigerator in a location
where no children have access.

WARNINGS AND PRECAUTIONS FOR SAFETY

- 3 -

SPECIFICATIONS

- 4 -

ITEMS SPECIFICATIONS

DIMENSIONS 960(W)X915(D)X1795(H) mm

(37

7

/8

X

36

1

/4

X

70

2

/3

in.)

NET WEIGHT 169kg (372

1

/2 lbs.)
COOLING SYSTEM Fan Cooling
TEMPERATURE CONTROL Micom Control
DEFROSTING SYSTEM Full Automatic

Heater Defrost
INSULATION Cyclo-Pentane
COMPRESSOR PTC Starting Type
EVAPORATOR Fin Tube Type
CONDENSER Wire Condenser
REFRIGERANT R134a (210g) (6

7

/8 oz.)
LUBRICATING OIL FREOL @15G (330 cc)
DRIER 1Ø0.83
CAPILLARY TUBE MOLECULAR SIEVE XH-7

ITEMS SPECIFICATIONS

FIRST DEFROST 5 - 6 Hours
DEFROST CYCLE 13 - 15 Hours
DEFROSTING DEVICE Heater, Sheath-AL

Heater, Sheath-ML
Heater, Drain

ANTI SWEAT HEATER Dispenser Duct Door Heater

Dispenser Heater
Frame LCD Heater

ANTI-FREEZING HEATER Chilled Room Duct Heater

Damper Heater

Tube Inject Heater
FREEZER LAMP 60W (1 EA)
REFRIGERATOR LOWER LAMP 60W (1 EA)
REFRIGERATOR UPPER LAMP 30W (2 EA)
DISPENSER LAMP 15W (1 EA)

<Front View> <Top View>

/16)

/2)

1

15

1790 (70

1750 (68

11

1072 (201/4)

960 (37

13

/16)

/16)

1795 (70

/16)

9

/16)

9

/2)

1

750 (29

801 (31

875 (34

/4)

1

/16)

7

915 (36

1407 (55

PARTS IDENTIFICATION

- 5 -

Icemaker

Bank Ice

Cover, Lamp -F

Shelf F

Drawer

Supporter

Basket

Cover Lower

Dairy Product Corner

Control Box, R

Cover, Lamp-R(U)
Cantilever Shelf

Egg Box
Snack Corner

Cover, Lamp-R(L)
Fruit/Vegetable

Drawer
Vegetable/Chilled

Drawer
Guide Bottle

Adjust Screw
(right)

Supporter Basket

Cover

Adjust Screw

(Ieft)

Slide Out
Cantilever Shelf

Guide Bottle

Vegetable/Chilled Drawer
Convertible Switch

Wine Rack

Optional Part

Cover PWB

Back

Handle

Frame

Display

Dispenser

Lamp

Remote Control

Receiver
Camera
Mic

Ice & Water

Dispenser

Button

Monitor

Management Switch

Reset Switch

Screen ON/OFF Switch

1. How to Adjust Door Height of Refrigerator

■ Make the refrigerator level first. (If the refrigerator is not installed on a level floor, the height of freezer and refrigerator
door may not be the same.)

1. If the height of freezer door is lower than the
refrigerator door:

2. If the height of freezer door is higher than the
refrigerator door:

Insert a driver  into the groove  of adjusting screw
and rotate driver in arrow direction (clockwise) until the
refrigerator becomes horizontal.

Insert a driver  into the groove  of adjusting screw
and rotate driver in arrow direction (clockwise) until the
refrigerator becomes horizontal.

HOW TO INSTALL REFRIGERATOR

- 6 -

Adjusting
Screw

Driver

Height
Difference

Height
Difference

Height
Difference

1

2

Height

Difference

2. How to Install Water Pipe

■ Install Water Filter (Applicable to some models only)

■ Before Installing water filter

1. Before installing the filter, take out the top shelf of the
refrigerator after tilting it to the direction () and lifting it
to the direction () and move it to the lower part.

2. Remove the lamp cover by pressing the protrusion
under the cover and pulling the cover to the front.

■ Installing water filter

1. Initial installation of water filter
Remove the filter substitute cap by turning it
counterclockwise () by 90 degrees and pulling it down.

Note : Keep it for later use when you do not use the filter.

Remove the red cap from the filter and attach the
sticker. Insert the upper part of the filter () after
aligning with the guideline marked on the control box,
and fasten it by turning it clockwise by 90 degrees.

Note : Verify that the guideline and the fastening indication

line are aligned.

2. Replacement of water filter

While holding the lower part of the filter, turn it
counterclockwise () by 90 degrees and pull it down.

Note : Verify that the guideline and the loosening indication

line are aligned.

■ After installing water filter

Reassemble the lamp cover and the top shelf of the
refrigerator. To place the top shelf of the refrigerator, raise
the front part of the shelf a bit so that the hook of the shelf
fits into the groove.
In order to clean the water filter system, drain water for
about 3 min.

Note : Then open the door of the refrigerator and check for

water dripping on the shelf under the filter.

HOW TO INSTALL REFRIGERATOR

- 7 -

Control box

Aligning with the guide line
and the fastening indication line

Control box

Aligning with the guide line
and the loosening indication line

Removal
of red cap

Adhesive
Sticker

Substitute
cap

3. How to Control the Amount of Water Supplied to Icemaker.

3-1. Verify the amount of water supplied to the Icemaker.

1. Pull out the ice bin in the upper part of the freezer compartment.

Caution : • Do not put hands or tools into the chute to

confirm the operation of geared motor.
(Doing so may damage refrigerator or cause
injury to hands.)

• Check the operation of motor by its
operation noise.

2. Apply electricity after connecting water pipe.

1) Press test switch under the Icemaker for two seconds as shown below.

2) The bell rings(ding~dong), ice tray rotates, and water comes out from the Icemaker water tube.

3) The water shall be supplied two or three times into the tray. The amount of water supplied for each time is small.
Put a water container under the ice tray and press test switch.

4) When ice tray rotates, the water in it will spill. Collect the spilled water and throw it into the sink.

5) When ice tray has finished rotation, water comes out from the water tube. Confirm the amounts of water in the ice tray.
(Refer to fig. The optimum amount of water is 110cc[6.7in

3

])

* It is acceptable if the adjusted level of water is a bit smaller than optimum level.

HOW TO INSTALL REFRIGERATOR

- 8 -

2

1

Test Switch

Confirm the amount

of water

Icemaker

Too much
Too small

Optimum level

3-2. Control the amount of water supplied to the

Icemaker.

Caution : • Unplug the power cord from the wall outlet and

wait for more than three minutes before
disconnecting PWB cover as 310V is applied in
the control panel.

1. Disconnect PWB cover from the upper part of the
refrigerator.

2. Adjust the amount of water supplied by using the DIP
switch.

■ Water Supplying Time Control Option

1) The water supplying time is set at five seconds when the
refrigerator is delivered.

2) The amount of water supplied depends on the setting
time and the local water pressure.

3) If the ice cubes are too small, increase the water
supplying time. This happens when too little water is
supplied to the tray. (eg: change 5 to 5.5 seconds)

4) If ice cubes stick together, decrease the water supplying
time. This happens when too much water is supplied
into the ice tray. (eg: change 5 to 4.5 seconds)

Caution : When adjusting the amount of water supplied,

adjust in small increments. Otherwise the water
may spill over.

3. When adjustment of control switch for the amount of
water supplied is complete, check the level of water in
the ice tray.

HOW TO INSTALL REFRIGERATOR

- 9 -

SWITCH NO Water Suppling

Switch1 Switch2 Switch3 Time

OFF OFF OFF 6 Sec.

ON OFF OFF 4 Sec.

OFF ON OFF 4.5 Sec.

ON ON OFF 5 Sec.

OFF OFF ON 5.5 Sec.

ON OFF ON 7 Sec.

OFF ON ON 8 Sec.

ON ON ON 9 Sec.

(+) Driver

Switch ON
Switch OFF

ON

1

23

PWB(PCB) Assembly

Confirm the amount

of water

Optimum level

1. Cooling Cycle (Cooling Principles/Refrigerant Gas Circulation)

1-1. Principles of cooling cycle

Cooling is an operation by which the temperature of a unit is maintained below the ambient temperature. For the
cooling operation, there must be an insulated space, the refrigerant (R134a) to absorb heat in the space, and a
refrigerant circulation system including a compressor, condenser, evaporator, etc. to conduct phase transformation of
the refrigerant.

1-2. Refrigerant gas circulation

 Compressor
 Wire Condenser
 Hot Line (Freezer Compartment)
 Hot Line (Refrigerator Compartment)
 Drier
 Capillary Tube
 Evaporator
 Suction Pipe
 Cooling Fan

1-3. Cool Air Circulation

Freezer Compartment Refrigerator Compartment

COOLING CYCLE AND REFRIGERANT

- 10 -

2

9

1

5

8

3

7

4

6

2. Description of each component

NOTE : • The pressure of refrigerant changes from high to low at capillary tube outlet. The low pressure refrigerant rushes

into the evaporator inlet and makes noise.

• When low pressure liquid refrigerant evaporates in the evaporator, evaporation takes place in the entire
evaporator from inlet to outlet. When this occurs, noise may sometimes occur. Noise depends on the amount of
evaporation so that noise may or may not occur. This is not a problem.

3. Containing refrigerant and foaming agent

* ODP: Ozone Depletion Index(relative value based on CFC11 as 1.0)

GWP: Globe Warmth Index(relative value based on CO

2 as 1.0)

COOLING CYCLE AND REFRIGERANT

- 11 -

Refrigerant Characteristics ODP GWP Remarks

Cyclo-Pentane It does not contain chlorine which depletes ozone layer. 0 8 Foaming Agent
(C5H10) Its GWP is almost zero. Pollution-free foaming agent.

R134a It does not contain chlorine which depletes ozone layer. 8 1200 Refrigerant
(HFC-134a) Its GWP is also very low compared with that of R12

(GWP:15,300).

NO. NAME FUNCTION REFRIGERANT (IN AND OUTLET)

Compresses refrigerant from low(0 kg/cm2) to
high pressure(8-12 kg/cm

2

)

Refrigerant transforms from high pressure gas
to high pressure liquid in condenser.
This phase transfromation dissipates heat.

Drier absorbs moisture in the system.
(moisture absorption equipment)

Long and narrow tubes. Refrigerant pressure
drops rapidly as refrigerant passes through the
tube.

Refrigerant transforms from low pressure liquid
to low pressure gas. This phase change absorbs
heat from the surrounding air and food. This
enables foods to freeze in the freezer and to
stay fresh in the refrigerator compartment.

Connects evaporator and compressor.

LOW PRESSURE
GAS(0 kg/cm

2

)

TEMP(30°C[86°F])

HIGH PRESSURE
GAS(8-12 kg/cm

2

)
TEMP(80[176°F]­120°C[248°F])

HIGH PRESSURE
LIQUID(8-12 kg/cm

2

)
TEMP(40[104°F]­60°C[140°F])

LOW PRESSURE
LIQUID(0 kg/cm

2

)

TEMP(-27°C[-17°F])

LOW PRESSURE
GAS(0 kg/cm

2

)

TEMP(-27°C[-17°F])

→ HIGH PRESSURE

GAS(8-12 kg/cm

2

)
TEMP(80[176°F]­120°C[248°F])

→ HIGH PRESSURE

LIQUID(8-12 kg/cm

2

)
TEMP(40[104°F]­60°C[140°F])

→ LOW PRESSURE

LIQUID(10 kg/cm

2

)

TEMP(-27°C[-17°F])

→ LOW PRESSURE

GAS(0 kg/cm

2

)

→ LOW PRESSURE

GAS(0 kg/cm2)
TEMP(30°C[86°F])

COMPRESSOR

CONDENSER

DRIER

CAPILLARY

TUBE

EVAPORATOR

SUCTION PIPE

1

2

3

4

5

6

1. Compressor(Reciprocating Type)

The compressor consists of a piston and motor. The motor
pushes piston and piston which compresses refrigerant
gas to a high pressure. Lubricants are sealed in the
compressor to a accelerate cooling and lubricate
compressor. Low pressure refrigerant is distributed through
the entire compressor but high pressure refrigerant gathers
around outer cooling plate through the outlet pipe.

NOTE : • A replacement compressor for service is full of

nitrogen gas and sealed with rubber when it is
delivered. This is to protect oxidation and to prevent
the intrusion of moisture into the compressor. When
bushing seals are removed, nitrogen gas shall rush
out, producing noise. This is normal. If the nitrogen
gas was leaked out. the compressor may be
corroded and should not be used.

• Compressor should be protected from impact
during transportation or storage to prevent
eccentricity of motor axis.

2. Over Load Protector

Over load protector relay protects motor by breaking
circuits when temperature rises and excess current flows in
the compressor. It consists of bimetal element and heater.
Bimetal element defroms when temperature rises and
heater emits heat when over current flows. This relay is
mounted on the outer surface of compressor and senses
temperature of compressor. This relay is connected to the
compressor motor in series. When operating contact point
of bimetal comes off from fixed contacting point, over load
protector relay breaks circuit. When the temperature of
compressor lowers and the heater cools, the operating
contact points move back to the fixed contact point and the
compressor works again after 3 or 5 minutes.

NOTE : • Over load protector relay detects temperature

and current at the same time. It operates when
the temperature of compressor is high even there
is no current. It shall also operates when over
current flows even the temperature of
compressor is low. It is also possible that both
high temperature and over current shall operate
relays at the same time.(Current is more effective
than temperature.)

• Over load protector relay shall operate again if
the surface temperature and current of
compressor repeats a breach of the threshold
values even though the heater is cools down
after 3 or 5 minutes of downtime. Customer may
claim that the relays repeated on and off
operation as the temperature remained constant.
In this case, switch off the power and let the
compressor cool down fully. If the relay
malfunctions after this, replace it with a new one.

3. Positive Temperature Coefficient (PTC)

Starter is connected to auxiliary winding in series and
accelerates compressor starting. It is located on outer case
of compressor with relays. Previously, the starter was a
contact point type. but it is now generally a PTC element
type. PTC stands for positive temperature coefficient and it
has a starting value of resistance(e.g. 22 Ω). It is an
element whose resistance becomes infinitive when current
flows. The starting principles of a single-phase induction
motor and simple alternating current circuit must be fully
understood in order to understand the roles of starter. The
circuit is shown below.

FUNCTIONS AND OPERATION PRINCIPLES OF MAIN PARTS

- 12 -

AC

CS CR

P.T.C

Piston

Motor
Spring

Iubricant

4. Switch(Door, Dispenser)

1. Function

1) Door switches in freezer and refrigerator compartments turns on and off the lamps when the freezer and refrigerator
doors are opened and closed. They also switch the fans in the freezer compartment on and off at the same time.

2) Home bar switch turns on and off the lamp in the refrigerator compartment when home bar is open and close.

3) Dispenser switch turns the dispenser lamp on and off when dispensing ice/water.

2. Operation Principles and Characteristics

3. Troubleshooting

FUNCTIONS AND OPERATION PRINCIPLES OF MAIN PARTS

- 13 -

Classification Door Switch Dispenser Switch

Shapes

Circuits

Troubles (Parts)

Symptoms Check Measures

- The switch points make contact depending on
wheather one of the doors is opened or closed.
These control the lamps in the refrigerator and
the freezer compartments.

- The dispenser bushing button is pressed by the
switch lever. This turns on the dispenser lamp.

Operation
Principles
/Charact

-eristics

Lamp is not on when door is
open. (door switch)

1. Dispenser lamp is not on
when bushing button is
pressed.

2. Ice and water are not
dispensed.

Bad Contact Operate switch button three or

four times and verify that the
lamp is on and off. See if lamp is
burnt out. If lamp is O.K, then
remove switch and measure the
resistance between terminals.
(Door Switch: 1-2, 3-4.)

Operate switch button three and
four times and confirm the lamp,
ice and water dispenser work. It
they do not work, then remove
switch and measure the
resistance between terminals.
(COM-NO)

Replace switch if the resistance
between terminals is not zero.

Replace switch if the resistance
between terminals is zero.

4
3

2
1

34

12

5. Motor

1. Freezer/Cooling Motor Used mainly for
Freezer/Cooling motor

■ Detail of connector

2) Gear Box Application Type

Gear box is used for moving and crushing ice which is
stored in the ice bin. Gear box is connected at the output
axis of shaded motor. Gear box changes high RPM of
motor to low RPM but high power by gear box. This power
can move and crush ice.

6. Solenoid.

1. Structure of Solenoid

Two types of solenoids are used for refrigerator depending
on the applications such as solenoids for ice cube and ice
dispenser. The solenoid is composed of an armature,
stator and a main body which supports stator and pulls the
armature when electricity is applied.

2. Operation Principles

When electricity is applied to the coil, magnetic field forms
around the coil. The armature in the magnetic field moves
toward the stator and ice dispenses. When electricity is
removed, the armature moves back to its original position
(rated stroke distance) by the spring force and stops
moving.

CAUTIONS : • Do not operate solenoid for more than two

minutes. It may be overheat.

• Solenoid is not for continuous use but
discontinuous use as it operates when
customer dispenses ice.

FUNCTIONS AND OPERATION PRINCIPLES OF MAIN PARTS

- 14 -

Shaft

Stator

Connector

Front(SHAFT Projective direction)

15Vdc(+)

EMF

GND(-)

Stator

Bobbin

Shaft

Gear Box

Stator

Coil

Coil

Stator

ArmatureArmature

<Solenoid for ice cube> <Solenoid for dispenser>

3. Troubleshooting

7. Heater

1. Summary

Heaters are used to remove dew and frost on the evaporator and ice and dew on the parts of refrigerator.

* SXS Refrigerator Defrost System

It is MICOM controlled automatic defrost system.
Heater turns on when the set time in MICOM has elapsed and off when the defrost sensor senses the defrost is complete.

2. Types of heater and their roles

FUNCTIONS AND OPERATION PRINCIPLES OF MAIN PARTS

- 15 -

Symptom Faults(parts) Check Measures

Crushed ice comes out when 1. Connector is missed. 1. Check connection parts. 1. Join connector.
ice cube is selected. 2. Solenoid for ice cube is cut. 2. Check resistance between 2. Replace parts.

terminals. The resistance is
infinite when it is cut.

Ice does not dispense but 1. Connector is disconnected. 1. Check connecting part. 1. Join connector.
jams on the door path 2. Solenoid for dispenser is 2. Check the resistance 2. Replace parts.
when ice is selected. cut. between terminals.

Resistance is infinite
when it is cut.

Classification Application Functions Resistance Remarks

Heater, Sheath-AL Evaporator Upper Part Evaporator Defrost 240W
Heater, Sheath-ML Evaporator Lower Part Evaporator Defrost 260W

It melts and discharges the ice dropped

Heater, Plate Drain Lower Part from the evaporator through drain pipe 45W

during defrost.
Heater, Plate Chilled Room Duct Prevent icing from the chilled room duct. 5W
Heater, Plate Damper Prevent icing from damper 3W
Heater, Plate Dispenser(Freezer door) Remove dew from dispenser 5W
Heater, Sheet Dispenser(Freezer door) Remove dew from duct door. 1W
Heater, Cord Frame LCD Prevent icing from Home Bar. 2.7W
Heater, Plate Tube Inject Prevent icing Tube Inject 3.5W

3. Faults Symptom (Products): faulty heater

1) Heater, Sheath-ML/AL

2) Heater Plate (Drain)

FUNCTIONS AND OPERATION PRINCIPLES OF MAIN PARTS

- 16 -

Problem Symptom Checks Measures

Problem Symptom Checks Measures

1. The resistance is infinity when it is
measured at both connector ends
with a tester.

2. Visually check for a faulty defrost
with eyes.

3. The resistance fluctuates very much
when the resistance is measured at
both ends with a tester.

4. When the resistance between both
connector ends is measured with a
tester, the resistance is zero or
beyond the allowance of marked
value. (allowance: marked value±7%)

Poor Defrost

Short circuit

1. Heater, Sheath heating
wire is cut, corroded, or
connecting wire is cut.

2. Evaporator is not close
enough to Heater,
Sheath-AL.

3. Poor terminal contact.

4. Moisture intrudes into
the pipe through the
crack as Heater,
Sheath-AL Pipe, and/or
Silicon Cap are dented.

1. Replace parts. (Reconnect if
wire is disconnected.)

2. Move evaporator closer to
Heater, Sheath-AL.

3. Correctly insert connector.

4. Replace parts.

1. The resistance is infinity when the
resistance is measured at both
connector ends with a tester.

2. The resistance fluctuates very
much when the resistance is
measured at both connector ends
with a tester.

3. When the resistance between both
connector ends is measured with a
tester, the resistance is zero or
beyond the allowance of marked
value. (allowance: marked
value±7%)

Poor defrost

Short circuit

1. Heating wire is cut or
corroded.

2. Poor terminal contact.

3. Moisture intrudes as
the heating wire is
damaged by a sharp fin
of evaporator.

1. Replace parts. (Reconnect if
wire is cut)

2. Correctly reinsert the connector.

3. Replace parts.

3) Other Heaters

8. Valve

1. Nomenclature of each part

 Solenoid Coil
 Spring
 Plunger
 Packing
 Holder
 Flow Control
 Flow Washer

2. Operation Principles

1) While Opening
When power is on and the inlet water pressure reaches
at a certain value, the plunger (3) moves up by solenoid
coil. The water passes through porous hole and then
center holes of the holder and flows to the outlet. Flow
control (6) and flow washer (7) are included in order to
maintain a constant flow rate and pressure (1.0 ~

8.0 kgf/cm

2

) in A line (water supplied to icemaker).

2) While Closing
The water stops flowing to outlet as packing seals (4)
the hole of holder (5) by spring when power is off.

FUNCTIONS AND OPERATION PRINCIPLES OF MAIN PARTS

- 17 -

Corresponding

Problem

Heater

Symptom Checks Measures

1. Heating wire is Heater Plate The temperature of chilled 1. The resistance is infinite when the 1. Replace parts.
cut or corroded. (Chilled drawer drawer is high. resistance is measured at both (Reconnect if the wire

2. Poor terminal duct) (icing on duct) connector ends with a tester. is cut)
contact. 2. The resistance significantly very much 2. Correctly insert

when the resistance is measured at both connector.
connector ends with a tester.

Heater Plate Incorrect refrigerator
(damper) compartment temperature.

(icing on the duct)

Heater Plate Dew forms around the 1. Remove connector from freezer hinge
(dispenser) dispenser and measure the resistance of heater.

Sheath Heater Dew forms around duct door. 1. The resistance is infinite when it is
(duct door) measured at both connector

ends with a tester.

Cord Heater Dew forms around 1. Remove connector from R hinge and
(Frame LCD) Frame LCD. measure the resistance of heater.

8

2

3

6

7

5

4

1

AB

Outlet

Inlet

1. Working Principles

1-1. Icemaker Working Principles

1-2. Dispenser Working Principles

1. This function is available in Model GR-D267 where water and ice are available without opening freezer compartment door.

2. Crushed Ice is automatically selected when power is initially applied or reapplied after power cut.

3. When dispenser selection switch is continuously pressed, light is on in the following sequence:
Water → Cube Ice → Crushed Ice.

4. Lamp is on when dispenser bushing button is pressed and vice versa.

5. When dispenser crushed ice bushing button is pressed, dispenser solenoid and geared motor work so that crushed ice
can be dispensed if there is ice in the ice bin.

6. When dispenser cube ice bushing button is pressed, dispenser solenoid, cube ice solenoid and geared motor work so
that cubed ice can be dispensed if there is ice in the ice bin.

7. When dispenser water bushing button is pressed, water valve opens and water is supplied if water valve is properly
installed on the right side of the machine room.

8. Ice and water are not available when freezer door is open.

ICEMAKER AND DISPENSER OPERA TION PRINCIPLE AND REPAIR METHOD

- 18 -

• Level Icemaker Cube Mould for Initial Control
after power is applied.

Power Input

Initial Control

Ice Making Control

Ice Ejection Control

Water Supply Control

Test Control

• Wait until the water in the cube mould is frozen
after Icemaker starts operation.

• Detect if ice bin is full of ice by rotating ice ejection
motor in normal and reverse direction and eject ice into
the ice bin if ice bin is not full.

•

This is for refrigerator assembly line and service. When ice making test switch is pressed,

it operates in the following steps: initial ice ejection water supply control steps.

• Conduct Ice Making Control after supplying water into the Icemaker
cube mould by operating water valve.

2. Function of Icemaker

2-1. Initial Control Function

1. When power is initially applied or reapplied after power loss, the Icemaker cube mould level is detected after completion
of MICOM initialization. The detecting lever moves up and down.

2. The level of Icemaker cube mould is determined by output signal, high and low signal, of Hall IC. The cube mould is
leveled by rotating ice ejection motor in normal or reverse direction. The High/Low Hall signal is be applied to MICOM Pin
No. 42.

3. If there is no change in signals one minute after the geared motor starts to operate, it stops Icemaker operation and
checks the signal every hour. It reinitializes the Icemaker when the feedback signals becomes normal.

4. It datermines that the initialization is completed when it senses the Icemaker cube mould is horizontal.

5. Ice ejection conducts for 1 cycle whether ice or not ice is in the ice bin when power is initially applied.

2-2. Water Supply Control Function

1. This function supplies water into the Icemaker cube mould by operating the water valve when ice ejection control is
completed and Icemaker mould is level.

2. The quantity of water supplied is determined by DIP switches and water pressure.

<Water Supply Quantity Table>

3. The refrigerator actively detects the DIP switch seting so that interrupting power is not necessary to change the supply
preset. If the DIP switches are changed while water is being supplied, the changes will take effect until the supply cycle is
complets.

4. When water supply signal is applied to water and ice valves at the same time during water supply, water is supplied to
water valve. If water supply signal is applied to ice valve during water supply, water is supplied to both water and ice
valves.

2-3. Ice Making Control Function

1. Ice making control is carried out from the completion of water supply to the completion of ice making in the cube mould.
Ice making sensor detects the temperature of cube mould and completes ice making. (ice making sensor is fixed below
Icemaker cube mould)

2. Ice making control starts after completion of water supply control or initial control.

3. Ice making is determined to be completed when ice making sensor temperature reaches at -8°C[18°F] 100 minutes after
water is supplied to Icemaker cube mould.

4. It is judged that ice making is completed when Icemaker sensor temperature reaches below -12°C[10°F] after 20 minutes
in condition 3.

ICEMAKER AND DISPENSER OPERA TION PRINCIPLE AND REPAIR METHOD

- 19 -

DIP SWITCH SETTING

No

SWITCH 1 SWITCH 2 SWITCH 3

WATER SUPPLY TIME REMARKS

1 OFF OFF OFF 6.5 Sec.
2 ON OFF OFF 5.5 Sec.
3 OFF ON OFF 6 Sec.
4 ON ON OFF 7 Sec.
5 OFF OFF ON 7.5 Sec.
6 ON OFF ON 8 Sec.
7 OFF ON ON 9 Sec.
8 ON ON ON 10 Sec.

* The quantity of water supplied

depends on DIP switch setting
conditions and water pressure as it is
a direct tap water connection type.
(the water supplied is generally 80 cc
to 120 cc)

* DIP switches are on the main PWB.

2-4. Ice Ejection Control Function

1. This function ejects the ice from the Icemaker cube mould after ice making is completed.

2. If Hall IC signal is on within 3.6 seconds after ice ejection motor rotates in normal direction, it does not proceed with ice
ejection. but waits. If the ice bin is full, ice ejection motor rotates in normal direction in every hour to check the condition of
ice bin. If the ice bin is not full, the water supply control starts after completion of ice ejection control. If the ice bin is full,
ice ejection motor rotates in reverse direction and stops ice making.

3. If ice bin is not full, ice ejection starts. The cube mould tilts to the maximum and ice is separated from the mould as ice
checking lever raises.

4. Ice ejection motor stops for 1 second if Hall IC signal changes from OFF (low) to ON (high) after 3.6 seconds when ice
ejection motor has rotated in normal direction. If there is no change in Hall IC signals within 1 minute after ice ejection
motor operates, ice ejection motor stops as ice ejection motor or Hall IC is out of order.

5. If ice ejection motor or Hall IC is abnormal, ice ejection motor rotates in normal direction to perform its reinitialization. It
resets the Icemaker if the ice ejection motor or Hall IC is normal.

6. The mould stops for 1 second at maximum tilted conditions.

7. The mould returns to a leveled position as ice ejection motor rotates in reverse direction.

8. When the mould is level, the cycle starts to repeat:
Water Supply → Ice Making → Ice Ejection → Mould Returns to Horizontal

ICEMAKER AND DISPENSER OPERA TION PRINCIPLE AND REPAIR METHOD

- 20 -

Bank is

not full

HALL IC

OUTPUT

SIGNALS

Bank is

full

HALL IC

OUTPUT

SIGNALS

ICE CHECKING

AXIS

ICE CHECKING LEVEL 30°

Maximum tilting

point

Ice making

(Original point)

Lock

2±1 sec

9±3 sec
8±3 sec

Ice Checking Ice Ejection

Lock

Horizontal

Conditions

Level Retrun

Conditions

<Timing Chart During Ice Ejection>

2-5 Test Function

1. This function forces operation during operation servicing and cleaning. The test switch is mounted under the automatic
Icemaker. The test function starts when the test switch is pressed for more than 0.5 second.

2. Test button does not work during ice ejection and water supply. It works when the tray is in the horizontal conditions. If the
mould is full of ice during test function operation, ice ejection control and water supply control will not work.

3. When the test switch is pressed for more than 0.5 second in the horizontal condition, ice ejection starts irrespect of the
mould conditions. Water will splash if test switch is pressed before the water in the mould freezes. Water shall be supplied
while the mould returns to the horizontal conditions after ice ejection. Problems involving ice ejection, returning to the
horizontal conditions, and water supply can be checked via the test switch. When test function performs normally, a
buzzer sounds and the water supply function begins. Check it for repair if buzzer does not sound.

4. When water supply function is completed, the cycle continues as follows: Ice making → Ice ejection → Returning to
horizontal conditions → Water supply

5. Remove ice from the Icemaker cube mould and press test switch. When Icemaker cube mould is full of ice as ice ejection
and water supply controls do not operate.

2-6. Other functions relating to freezer compartment door opening

1. When freezer door is open, ice dispenser stops in order to reduce noise and ice drop.

2. When freezer door is open during ice ejection and cube mould returning to horizontal condition, ice ejection and cube
mould level return proceed.

3. When freezer door is open, geared motor and cube ice solenoid immediately stop and duct door solenoid stops after 5
seconds.

4. Water dispenser stops in order to prevent water spilling when freezer door is open.

5. Test function operates normally regardless of refrigearator compartment door opening.

ICEMAKER AND DISPENSER OPERA TION PRINCIPLE AND REPAIR METHOD

- 21 -

3. Icemaker Troubleshooting

* Troubleshooting: it is possible to check the dispenser by pressing freezer and refrigerator temperature control buttons

for more than 1 second. (Icemaker is normal if all leds are on): refer to trouble diagnposis function in
MICOM section.

ICEMAKER AND DISPENSER OPERA TION PRINCIPLE AND REPAIR METHOD

- 22 -

No

Yes

Yes

Yes

No

No

No

No

Yes

Yes

Is DC Power (5V and 12V)

output normal?

Failed DC Power

• Check DC power (5V, 12V).

Change main PWB

Is cube ice LCD off during

troubleshooting check?

Failed icemaking sensor

• Check the resistance of
both ends (1,2) of icemaking
sensor of CON9.

• Defects between icemaking
sensor and board
(Pin No. 60 of IC1)

Replace Ice making
Sensor

Is Crushed Ice LCD off during

troubleshooting check?

Failed Icemaker Unit

• Is the resistance of both ends
(9,10) of ice ejection motor of
CON9 between 18 and 22Ω?

• Is ice ejection motor drive circuit
(IC11 and peripheral circuits)
normal?

• Defects between Hall IC and
Board (Pin No. 42 of IC1).

• Confirm ice ejection and level
return when pressing
test switch.

Replace Icemaker Unit

Replace Main PWB

Are ice

ejection and level return

normal when test switch is

pressed for more than 0.5 second?

Does the bell

sound once?

Failed Icemaker unit test switch

• Are both ends (5,6) of CON9
test switch open?

• Defects between test switch
and board (Pin No. 38 of IC1).

• Are both ends (3,4) of CON9
ice maker stop switch short?

Replace Icemaker Unit

Replace water
supply valve

• Is power applied to water
supply valve?

• Does the water supply
valve work normally?

• Is the water supply line
normally connected?

Poor water supply

Is water suppy normal

after Ice ejection and level return

by ice ejection motor?

Normal

4. Icemaker circuit part

The Icemaker circuit above applies to the GR-D267 and consists of the Icemaker unit part installed in the freezing section
and the Icemaker drive part of the main PWB.

Water supply to the Icemaker container is accomplished by opening the valve via a solenoid relay for a duration set by the
DIP switches. When water supply time elapsed, water supply automatically stops. This circuit exists for implementing
functions such as ice removal, ice-full detection, horizontal balancing and sense of ice-making temperature sensing for the
Icemaker container. Ice-making temperature sensing is same as in the temperature sense circuit part of the main PWB,
refer to it.

Test switch input detection of the Icemaker is same as in the door switch input detection circuit of the main PWB.

1. This function is used in operation test, service execution and cleaning, etc. And is performed if pressing the test switch
installed at the automatic Icemaker itself for more than 0.5 seconds.

2. The test switch operates when the ice-maker is in the horizontal position. Test function is not available during the water
supply operation. Ice removal control and water supply controls are not performed if ice-full is detected during the
operation of test function.

3. If pressing the test switch for 0.5 second or more in the horizontal status, ice removal operation is immediately performed
regardless of the generation conditions of ice in the ice-making tray. Therefore, exercise caution as water may overflow
when operating test function before the water has frozen. The water supply function operates with the horizontal
balancing operation after ice removal operation. Therefore, you can check any problem of ice removal operation,
horizontal operation and water supply. In this case, if test check returns normal feedback, a bell sound rings and water
supply control is performed. No ringing of the bell sound means failure and repair service must be performed.

4. When water supply is completed, operation continues in the normal cycle of ice making, ice removal, returning to

horizontal status, and water supply.

ICEMAKER AND DISPENSER OPERA TION PRINCIPLE AND REPAIR METHOD

- 23 -

1. Monitor Panel

2. Description of Function

2-1. Funnction of Temperature Selection

* The temperature can vary ±3 °C depending on the load condition.

❉ Whenever pressing button, setting cycles in the order of (Medium) ➝ (Medium Max) ➝ (Max) ➝ (Min) ➝

(Medium Min).

• The actual inner temperature varies depending on the food status, as the indicated setting temperature is a target

temperature, not the actual temperature within refrigerator.

• Refrigeration appears to be weak at first use. Please adjust temperature as shown after using refrigerator for minimum

of 2 to 3 days.

MICOM FUNCTION

- 24 -

OFF

ON

WATER

TEMP TEMP

FILTER STATUS

FILTER RESET

PUSH 3 SEC.

ROOM TEMP

UNLOCK

LOCK

6
5
4
3
2
1

H

M

L

CUBED

CRUSHED

Division Power Initially On 1st Press 2st Press 3th Press 4th Press

Setting
temperature

Temperature
Control

Medium Medium Max Max Min Medium Min

Freezer Control

-19 °C [-2 °F] -22 °C [-7 °F] -23 °C [-9 °F] -15 °C [5 °F] -17 °C [1 °F]

Refrigeration

3 °C [37 °F] 2 °C [35 °F] 0°C [32 °F] 6 °C [43 °F] 4 °C [39 °F]

Control

H

M

L

H

M

L

H

M

L

H

M

L

H

M

L

2-2. LCD Back Light Control

1. In order to easily view display status on the LCD, LCD Back Light turns on for a minute in application of initial power, for a
minute with button use, and for a minute after closing the door.

2. If pressing any display button once with the backlight turned off, buzzer rings and button function is not performed but
only backlight is turned on (If pressing the first button with the back light turned off, only back light ON function is
performed).

3. When pressing the special freezing button and the freezing temperature adjustment button for more than a second, the
back light is turns on and all the graphics of LCD are turned on. If releasing the button, the LCD graphic returns to in the
previous state and the back light turns off (check LCD graphic and back light ON/OFF status).

2-3. Outside temperature display function

1. The temperature sensor at the left U of refrigerator senses ambient temperature and displays that temperature in the left
side of Outside temperature text on the LCD display.

2. Ambient temperature is displayed up to -9°C[16°F] ~ 49°C[120°F] and displayed as Lo for less than -10°C[14°F] and as
HI for more than 50°C[122°F]. If the ambient temperature sensor fails, Er is displayed.

3. Since display temperature of ambient temperature is temperature sensed by the ambient sensor in the hinge U of the
freezing compartment, it may differ from the ambient temperature display of other household electrical appliances.

2-4. Lock function (display button lock)

1. When power is first applied, only the Release text is turned on in the lock/release status indicator at the right side of the
LCD display.

2. If desiring to lock the display status, press the lock/release button once, Release text is turns off at the right side of lock
graphic of LCD and Lock text is turned on indicating locked status.

3. The only buzzer sound rings and function is not performed even if pressing display button other than lock/release key
when in the lock status.

4. If desiring to release the lock status, press the lock/release button once, Lock text turns off at the right side of lock
graphic of LCD and Release text turns on in dicating locked release status.

2-5. Filter status display function

1. Remaining filter replacement period is displayed as in the below figure. Each line in dicates the number of months before
the next filter replacement.

2. The graphic/text indicator appears if in the LCD if 6 months of filter use have passed.

3. Reset the filter status by pressing the filter replace button for more than 3 seconds to after replacing filters when 6 months
of filter use have transpired or merely if desiring to reset the filter display status.

2-6. Automatic Icemaker

• The automatic Icemaker can automatically make 8 pieces of ice at a time up to 10 times a day, These quentities may vary

according to various conditions in cluding how many times the refrigerator door opens and closes.

• Ice making stops when the ice storage bin is full.

• If you don’t want to use automatic Icemaker, switch the Icemaker OFF.

If you want to use automatic Icemaker later, switch it ON.

NOTE : It is normal that a noise is produced when ice made is dropped into the ice storage bin.

MICOM FUNCTION

- 25 -

Classification

In initial 1 Month 2 Months 3 Months 4 Months 5 Months 6 Months

use use use use use use use

Filter Status

Display

FILTER RESET

PUSH 3 SEC.

FILTER STATUS FILTER STATUS FILTER STATUS FILTER STATUS FILTER STATUS FILTER STATUS FILTER STATUS

6
5
4
3
2
1

6
5
4
3
2
1

6
5
4
3
2
1

6
5
4
3
2
1

6
5
4
3
2
1

6
5
4
3
2
1

FILTER RESET

PUSH 3 SEC.

6
5
4
3
2
1

2-7. When Icemaker does not operate smoothly

Ice is frozen together

• When ice is frozen together, take the lumps out of the ice storage bin, break them into small pieces, and then place them

into the ice storage bin again.

• When the Icemaker produces ice too small or frozen ice, the amount of water supplied to the Icemaker needs to adjusted.

Contact the service center.

✻ If ice is not used frequently, it may freeze together.

Power failure

• Ice may drop into the freezer compartment. Take the ice storage bin out and discard all the ice. Then dry it and place it

back in its position. After the machine is powered again, crushed ice will be automatically selected.

The unit is newly installed

• It takes about 12 hours for a newly installed refrigerator to make ice in the freezer compartment.

2-8. Super freezer

Please select this function for prompt freezing.

• On or Off cycles whenever pressing SUPER FRZ button.

• The graphic indicator remains in the On status after flickering 4 times when selecting Special Refrigeration On.

• Super freezer function automatically turns off after a fixed time passes.

2-9. Lock

This button prevents use of a different button.

• At initial Power on, the control panel is unlocked.

• Lock or Release cycles whenever pressing the LOCK CONTROL.

• Pressing another button while the panel is locked will yield no results.

2-10. Super freezing

1. Super freezing is a function to improve cooling speed of the freezing chamber by consecutively operating compressors
and freezing room fan. Pressing the super freezing button toggles the Super Freezer feature on and off when the feature
turns on the graphic remains on after blinking once.

2. Super freezing is cycles in order of Selection/ Release (Turn On / Turn Off) whenever pressing the selection button.

3. Super freezing is released if power failure occurs and the re frigerator then returns to the original status.

4. Temperature setting is not changed even if selecting the super freezing option is selected.

5. A change of the temperature setting of the freezing chamber or the cold storage chamber is permitted with super freezing
selected. The change is processed while Super Freeze is active.

6. The cold storage chamber operates in the state currently set with super freezing selected and processed.

7. Note that the super freezing, the super freezing function deactivates after continuously operating compressor and the
freezing room fan for a certain amount of time.

8. If frost removal starting time occurs during super freezing, super freezing operation executes only for the remaining time
after completion of frost removal when the super freezing operation time passes 90 minutes. If passing 90 minutes, super
freezing operation is carried out only for 2 hours after completion of frost removal.

9. If pressing the super freezing button during frost removal, the super freezing LCD indicator turns on but if pressing the
super freezing, compressor operates only after the remaining defrost time has passed.

10. If selecting super freezing within 7 minutes (delay for 7 minutes of compressor) after the compressor stops, compressor

operates after the remaining time has passed.

11. The freezing room fan motor operates at high RPM during operation of super freezing.

MICOM FUNCTION

- 26 -

2-11. Control of variable speed freezing room fan

1. To increase cooling speed and load response speed, the MICOM sets freezing room fan motor at the high speed of RPM
or the standard RPM.

2. Only at the application of initial power, or special freezing operation, or load response operation does the MICOM direct
speed of RPM. The MICOM directs the standard RPM in other general operations.

3. If opening doors of freezing / cold storage chamber or home bar while fan motor in the freezing chamber operates, the
freezing chamber fan motor operates normally. (If operating in the high speed of RPM, it switches to the standard RPM).
However, if opening doors of freezing chamber or home bar, the freezing room fan motor stops.

4. As for monitoring of BLDC fan motor error in the freezing chamber, MICOM immediately stops the fan motor when
sensing that the BLDC fan motor is locked or pooly operating if there would be position signal for more than 65 seconds
at the BLDC motor. In such cases, the MICOM in dicutes a failure (refer to failure diagnosis function table) on the LCD
display and attempts arestant of the cycle in 30 minutes. If normal operation is detected, failure status is released and
refrigerator resets to the initial status (reset).

2-12. Control of cooling chamber fan motor

1. The cooling chamber fan motor performs ON/OFF control by linking with the COMP.

2. It operates at the single RPM without varying RPM.

3. Failure sensing method is same as freezing fan motor (refer to failure diagnosis function table for failure display).

2-13. Door opening alarm

1. Buzzer generates alarm sound if doors are not closed even when more than a minute consecutively has passed with
doors of freezing / cold storage chamber or home bar opened.

2. Buzzer rings three times in the interval of 0.5 seconds after the first one-minute has passed after doors are opened and
then repeats three times of On/Off alarm in the cycle of every 30 seconds.

3. If the doors of freezing/cold storage chamber or home bar are closed during door open alarm, alarm is immediately
deactivated.

2-14. Ringing of button selection buzzer

1. If pressing the front display button, a bell sound rings.

2-15. Ringing of forced operation, forced frost removal buzzer

1. If you press the test button on the Main PCB, a tone sounds.

2. In selecting forced operation, alarm Sound is repeated and completed in the cycle of On for 0.2 second and Off for 1.8
second three times.

3. In selecting forced frost removal, alarm sound is repeated and completed in the cycle of On for 0.2 second , Off for 0.2
second, On for 0.2 second and Off for 1.4 second three times.

MICOM FUNCTION

- 27 -

Doors of

freezing/cold

storage

chamber or

home bar

BUZZER

Closing

Opening

Within

a minute

A minute

30

seconds30seconds30seconds

Opening

Closing Closing

3 Times 3 Times 3 Times 3 Times

2-16. Frost removal function

1. Frost removal is performed every 7 to 7.5 hours of accumulated compressor operation time.

2. After providing initial power (or after power failure), frost removal starts whenever total operation time of compressor
becomes 4 to 4.5 hours.

3. Frost removal is completed if temperature of the frost removal sensor becomes more than 5°C[41°F] after starting frost
removal. Poor frost removal is not displaced if it does not arrive at 5°C[41°F] even if two hours have passed after starting
frost removal.

4. No removal is done if frost removal sensor fails (snapping or short-circuit).

2-17. Electric Equipment Progressive Operation

Compressor, defrost heater, freezer fan, cooling fan, electromagnetic single motor damper, etc. start in the following
sequence in order to prevent noise and parts damage when power is first applied and when testing is complete.

MICOM FUNCTION

- 28 -

Function Load Starting Sequence Remarks

When electricity is first applied TEST MODE

When the
temperature of
defrost sensor is
above 45°C[1 13°F]
(when purchased

or moved to
another house)

If there is an error in
the process, startup
does not work.

■Load starting
sequence when

freezer and
refrigerator doors
are closed.

If switch is once
more pressed or the
temperature of
defrost sensor is
above +5°C[41°F] in
test mode 2, it
returns to test mode
and starts initial
drive. (compressor
will start after seven
minutes)

When the
temperature of
defrost sensor is
below 45°C[1 13°F]
(during power loss

and servicing)

Test Mode 1
(Forced Starting)

Test Mode 2
(Forced Defrost)

POWER

ON

COMP

ON

FAN

(High Speed)

ON

MOTOR

DAMPER

ON

HOME

BAR

HEATER

ON

POWER

ON

DEFROST

HEATER

ON

HOME

BAR

HEATER

OFF

HOME

BAR

HEATER

ON

VEGETABLE

HEATER

DAMPER

HEATER

ON

COMP

ON

FAN

ON

MOTOR

DAMPER

ON

VEGETABLE

HEATER

DAMPER

HEATER

OFF

TEST

S/W

(Press

Once)

COMP

ON

FAN

(High Speed)

ON

MOTOR

DAMPER

ON

TEST

S/W
(Press
Twice)

COMP

OFF

FAN
OFF

MOTOR

DAMPER

ON

1/2
sec

1/4
sec

1/4

sec

1/4
sec

1/2
sec

10

sec

1/4

sec

5

sec

DEFROST

HEATER

OFF

5

sec

1/4
sec

20

sec

1/4
sec

1/4
sec

1/4

sec

1/4
sec

1/4
sec

1/4

sec

1/4
sec

1/4

sec

OTHER

LOAD

OFF

DEFROST

HEATER

ON

2-18. Failure Diagnosis Function

1. Failure diagnosis function is a function to facilitate servicing when improper operation of the product occurs.

2. The user will notice a failure when pressing one of the function buttons yields no consequent effect beyond the audible
Ding.

3. If the improper operation ceases while a failure is displayed, the MICOM resets the display to a normal state.

4. A failure code is indicated on the LCD displays refrigerator and freezer temperature readouts temperature for the freezing
room and the display part of setting temperature for the cold storage room of LCD, which are placed at the display part of
a refrigerator. All the LCD graphics other than a failure code are turned off.

✽ In display of the failure mode, all LCDs of setting temperature for freezing/ setting temperature and for cold storage are

turned off (excluding Note1 and Note2).

MICOM FUNCTION

- 29 -

OFF

WATER

FILTER STATUS

UNLOCK

6
5
4
3
2
1

H

M

L

CUBED

CRUSHED

TEMP TEMP

ROOM TEMP

●● : Normal Operation

1

2

3

4

5

6

7

8

9

10

11

12

Er FS

Er rS

Setting temperature

display (Note 2)

Er dS

Er dH

Er FF

Er CF

Er CO

Er dP

Setting temperature

display (Note 1)

Setting temperature

display (Note 2)

Setting temperature

display (Note 2)

Failure code display part

Setting

temperature

for freezing

Setting

temperature for

cold storage

No. Item

Symptoms of failure

Freezer

Fan

Compressor

Stepping

motor damper

Defrost

Heater

M/C room

Fan

Product operation status in failure

Failure of freezer
sensor

Failure of refrigerator
sensor 1

Failure of refrigerator
sensor 2

Failure of frost
removal sensor

Poor of frost
removal

Failure of BLDC FAN
at freezing section

Failure of BLDC FAN
at machine section

Failure of
Communication

Abnormal
electronic single
motor Damper

Failure of
Outside Sensor

Failure of ice
removal sensor

Failure of
Icemaker unit

Snapping or short-circuit of
freezer sensor

Snapping or short-circuit of
refrigerator sensor 1

Snapping or short-circuit of
refrigerator sensor 2

Snapping or short-circuit of frost
removal sensor

Snapping of frost removal heater
or temperature fuse, pull-out of
connector (indicated minimum 4
hours after failure occurs)

Poor motor, connection of wires
to fan. Contact of structures to
Fan. Snapping or short-circuit of
L/wire (if there is no fan motor
signal for more than 60 seconds
in operation of fan motor

Connection between main PCB
and display PCB. Snapping or
short-circuit of L/wire.
Transmission between main PCB
and display PCB. Poor TR and
receiving part.

Faulty damper motor. Lead wire of
damper lead switch in out or short­circuited. Interference of foreign
materials in damper baffle or EPS.

Snapping or short-circuit of outside
temperature perceiving sensor

Snapping or short-circuit of ice­making sensor

Poor motor or Hall IC within ice-maker
unit. Snapping or short-circuit of
L/Wire. Poor main PCB drive circuit.

Standard

RPM

Standard

RPM

Standard

RPM

Standard

RPM

Standard

RPM

OFF (check every

30 minutes)

Standard

RPM

Standard

RPM

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●●

OFF (check

every 30 minutes)

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●●

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ON for 15minutes

OFF for 15minutes

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●●

●●

●●

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No frost
removal

●●

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Open for 10munutes,
closing for 15 minutes

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Check

operation

every hour

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●●

Note1) In failure of outside sensor, the temperature setting for freezing/ cold storage displays normally and indicated Er is

indicated on the outside temperature display part (normally displayed except for the outside temperature display
part).

Note2) Improper operation of R2 sensor, Icemaker-sensor and Icemaker kit are displayed in LCD check, but not indicated

on the failure display part. To check these items, press freezing temperature adjustment button and special freezing
button for a second or more.

Cold storage sensor 2 Normal : (C) Part LCD graphic- ON
(middle partition) Abnormal: Only (C) Part LCD graphic-OFF

Icemaker sensor

Normal: (D) Part LCD graphic-ON
Abnormal: Only (D) Part LCD graphic-ON

Icemaker Unit

Normal: (E) Part LCD graphic-ON
Abnormal : Only (E) Part LCD graphic-ON

2-19. Test Function

1. The purpose of the test function is to check function of the PWB and product and to search for the failed part when the
product is in a failure status.

2. Test button is located on the main PCB of refrigerator (test switch), and the test mode will finish after a maximum of 2
hours irrespective of test mode and then is before restting to the normal operation.

3. Function adjustment buttons do not function during test mode but only warning sound rings.

4. Upon test mode completion, always pull the power cord out and then plug-in it again to reset to normal operation.

5. If misoperations contents such as sensor failure are found during performance of test mode, release the test mode and
note the failure code.

6. If pressing the test button is pressed during a failure code display, test mode will not be activated.

MICOM FUNCTION

- 30 -

Other LCD graphics - ON

Test 1

Test 2

Normal

condition

Mode Manipulation Content Remarks

Press TEST switch once

Press TEST switch once at
TEST1 condition

Press TEST switch once at
TEST2 condition

1. Continuous operation of compressor

2. Continuous operation of freezing chamber
fan (high speed RPM) and M/C chamber fan

3. Frost removal heater OFF

4. Full opening status (baffle opened) status of
electronic step motor damper

5. All display LCD graphics - ON.

1. Compressor OFF

2. Freezing chamber fan and M/C chamber
fans are turned off.

3. Frost removal heater ON

4. Full closing status (baffle closed) status of
electronic step motor damper

5. All display LCD graphics - OFF
( (A) Medium status. (B) Medium status.
Only LCD is turned on)

Return to the initial status.

Freezing room fan is
turned off in door open.

Compressor is operates
after 7 minutes.