LG LRSC21951xx Service Manual

CAUTION

PLEASE READ CAREFULLY THE SAFETY PRECAUTIONS OF THIS BOOK
BEFORE CHECKING OR OPERATING THE REFRIGERATOR.

REFRIGERATOR

SERVICE MANUAL

http://biz.lgservice.com

MODEL: GR-L207MSU

COLOR: Stainless-Steel

Ref. No.
GR-L207MSU

CONTENTS

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

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

PARTS IDENTIFICATION..................................................................................................................................................... 12

HOW TO INSTALL THE REFRIGERATOR.......................................................................................................................... 18

HOW TO ADJUST DOOR HEIGHT OF THE REFRIGERATOR ........................................................................................ 18

HOW TO INSTALL WATER PIPE........................................................................................................................................19

HOW TO CONTROL THE AMOUNT OF WATER SUPPLIED TO THE ICEMAKER ......................................................... 23

MICOM FUNCTION .............................................................................................................................................................. 25

EXPLATION FOR MICOM CIRCUIT..................................................................................................................................... 33

EXPLANATION FOR PWB CIRCUIT ..................................................................................................................................33

COMPENSATION CIRCUIT FOR WEAK-COLD, OVER-COLD AT FREEZING ROOM.....................................................48

PWB PARTS DRAWING AND LIST ....................................................................................................................................51

PWB CIRCUIT DIAGRAM ...................................................................................................................................................61

ICE MAKER AND DISPENSER OPERATION PRINCIPLE AND REPAIR METHOD.......................................................... 65

WORKING PRINCIPLES.....................................................................................................................................................65

FUNCTION OF ICE MAKER ...............................................................................................................................................66

ICE MAKER TROUBLESHOOTING....................................................................................................................................69

ICE MAKER CIRCUIT PART ...............................................................................................................................................70

CIRCUIT................................................................................................................................................................................ 71

TROUBLE DIAGNOSIS........................................................................................................................................................ 73

TROUBLE SHOOTING ...................................................................................................................................................... 73

FAULTS .............................................................................................................................................................................. 83

COOLING CYCLE HEAVY REPAIR ................................................................................................................................. 100

HOW TO DEAL WITH CLAIMS........................................................................................................................................ 107

HOW TO DISASSEMBLE AND ASSEMBLE..................................................................................................................... 112

DOOR ............................................................................................................................................................................... 112

HANDLE ........................................................................................................................................................................... 113

SHROUD, GRILLE FAN ................................................................................................................................................... 113

ICEMAKER ....................................................................................................................................................................... 113

DISPENSER ..................................................................................................................................................................... 114

WATER TANK AND WATER LINE.................................................................................................................................... 116

HOME BAR....................................................................................................................................................................... 116

EXPLODED VIEW............................................................................................................................................................... 117

REPLACEMENT PARTS LIST........................................................................................................................................... 126

- 2 -

WARNINGS AND PRECAUTIONS FOR SAFETY

Please observe the following safety precautions in order to
use safely and correctly the refrigerator and to prevent
accident and danger during repair.

1. Be care of an 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, please wait for more than
five minutes after power cord was disconnected from the
wall outlet.

3. Please check if the power plug is pressed down by the
refrigerator against the wall. If the power plug was
damaged, it may cause fire or electric shock.

4. If the wall outlet is over loaded, it may cause fire. Please
use its own individual electrical outlet for the refrigerator.

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

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

9. Please check the evidence of moisture intrusion in the
electrical components. Replace the parts or mask it
with insulation tapes if moisture intrusion was
confirmed.

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

11. Do not let the customers repair, disassemble, and

reconstruct the refrigerator for themselves. It may
cause accident, electric shock, or fire.

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

13. Do not put flower vase, cup, cosmetics, chemicals,
etc., or container with full of water on the top of the
refrigerator.

6. Use standard electrical components when replacing
them.

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

14. Do not put glass bottles with full of water into the
freezer. The contents shall freeze and break the glass
bottles.

15. When you scrap the refrigerator, please disconnect the
door gasket first and scrap it where children are not
accessible.

- 3 -

SPECIFICATIONS

1. Ref No. : GR-P247

ITEMS SPECIFICATIONS

DIMENSIONS (mm) 898(W)X847(D)X1756(H)

NET WEIGHT (kg) 151

COOLING SYSTEM Fan Cooling

TEMPERATURE CONTROL Micom Control

DEFROSTING SYSTEM Full Automatic

Heater Defrost

INSULATION Cyclo-Pentane

COMPRESSOR P.T.C. Starting Type

EVAPORATOR Fin Tube Type

CONDENSER Wire Condenser

REFRIGERANT R134a (180g)

LUBRICATING OIL FREOL @10G (310 cc)

CAPILLARY TUBE ID 0.83

DRIER MOLECULAR SIEVE XH-7

ITEMS SPECIFICATIONS

FIRST DEFROST 4 - 5 Hours

DEFROST CYCLE 13 - 15 Hours

DEFROSTING DEVICE Heater, Sheath

ANTI SWEAT HEATER Dispenser Duct Door Heater

Dispenser Heater

Home Bar Heater

ANTI-FREEZING HEATER Water Injection Heater

Damper Heater

FREEZER LAMP 40W (1 EA)

REFRIGERATOR LAMP 40W (1 EA)

DISPENSER LAMP 15W (1 EA)

1756

898

948

685

745

796

847

1218.5

<Front View> <Plane View>

- 4 -

SPECIFICATIONS

2. Ref No. : GR-P207

ITEMS SPECIFICATIONS

DIMENSIONS (mm) 898(W)X762(D)X1756(H)

NET WEIGHT (kg) 146

COOLING SYSTEM Fan Cooling

TEMPERATURE CONTROL Micom Control

DEFROSTING SYSTEM Full Automatic

Heater Defrost

INSULATION Cyclo-Pentane

COMPRESSOR P.T.C. Starting Type

EVAPORATOR Fin Tube Type

CONDENSER Wire Condenser

REFRIGERANT R134a (180g)

LUBRICATING OIL FREOL @10G (310 cc)

CAPILLARY TUBE ID 0.83

DRIER MOLECULAR SIEVE XH-7

ITEMS SPECIFICATIONS

FIRST DEFROST 4 - 5 Hours

DEFROST CYCLE 13 - 15 Hours

DEFROSTING DEVICE Heater, Sheath

ANTI SWEAT HEATER Dispenser Duct Door Heater

Dispenser Heater

Home Bar Heater

ANTI-FREEZING HEATER Water Injection Heater

Damper Heater

FREEZER LAMP 40W (1 EA)

REFRIGERATOR LAMP 40W (1 EA)

DISPENSER LAMP 15W (1 EA)

1756

898

948

600

660

711

762

1133.5

<Front View> <Plane View>

- 5 -

SPECIFICATIONS

3. Ref No. : GR-L247

ITEMS SPECIFICATIONS

DIMENSIONS (mm) 898(W)X847(D)X1756(H)

NET WEIGHT (kg) 145

COOLING SYSTEM Fan Cooling

TEMPERATURE CONTROL Micom Control

DEFROSTING SYSTEM Full Automatic

Heater Defrost

INSULATION Cyclo-Pentane

COMPRESSOR P.T.C. Starting Type

EVAPORATOR Fin Tube Type

CONDENSER Wire Condenser

REFRIGERANT R134a (180g)

LUBRICATING OIL FREOL @10G (310 cc)

CAPILLARY TUBE ID 0.83

ITEMS SPECIFICATIONS

DRIER MOLECULAR SIEVE XH-7

FIRST DEFROST 4 - 5 Hours

DEFROST CYCLE 13 - 15 Hours

DEFROSTING DEVICE Heater, Sheath

ANTI SWEAT HEATER Dispenser Duct Door Heater

Dispenser Heater

ANTI-FREEZING HEATER Water Injection Heater

Damper Heater

FREEZER LAMP 40W (1 EA)

REFRIGERATOR LAMP 40W (1 EA)

DISPENSER LAMP 15W (1 EA)

1756

898

948

685

745

796

847

1218.5

<Front View> <Plane View>

- 6 -

SPECIFICATIONS

4. Ref No. : GR-L207

ITEMS SPECIFICATIONS

DIMENSIONS (mm) 898(W)X762(D)X1756(H)

NET WEIGHT (kg) 140

COOLING SYSTEM Fan Cooling

TEMPERATURE CONTROL Micom Control

DEFROSTING SYSTEM Full Automatic

Heater Defrost

INSULATION Cyclo-Pentane

COMPRESSOR P.T.C. Starting Type

EVAPORATOR Fin Tube Type

CONDENSER Wire Condenser

REFRIGERANT R134a (180g)

LUBRICATING OIL FREOL @10G (310 cc)

CAPILLARY TUBE ID 0.83

ITEMS SPECIFICATIONS

DRIER MOLECULAR SIEVE XH-7

FIRST DEFROST 4 - 5 Hours

DEFROST CYCLE 13 - 15 Hours

DEFROSTING DEVICE Heater, Sheath

ANTI SWEAT HEATER Dispenser Duct Door Heater

Dispenser Heater

ANTI-FREEZING HEATER Water Injection Heater

Damper Heater

FREEZER LAMP 40W (1 EA)

REFRIGERATOR LAMP 40W (1 EA)

DISPENSER LAMP 15W (1 EA)

1756

898

948

600

660

711

762

1133.5

<Front View> <Plane View>

- 7 -

SPECIFICATIONS

1. Ref No. : GR-C247

ITEMS SPECIFICATIONS

DIMENSIONS (mm) 898(W)X847(D)X1756(H)

NET WEIGHT (kg) 142

COOLING SYSTEM Fan Cooling

TEMPERATURE CONTROL Micom Control

DEFROSTING SYSTEM Full Automatic

Heater Defrost

INSULATION Cyclo-Pentane

COMPRESSOR P.T.C. Starting Type

EVAPORATOR Fin Tube Type

CONDENSER Wire Condenser

REFRIGERANT R134a (180g)

LUBRICATING OIL FREOL @10G (310 cc)

CAPILLARY TUBE ID 0.83

DRIER MOLECULAR SIEVE XH-7

ITEMS SPECIFICATIONS

FIRST DEFROST 4 - 5 Hours

DEFROST CYCLE 13 - 15 Hours

DEFROSTING DEVICE Heater, Sheath

ANTI SWEAT HEATER Home Bar Heater

ANTI-FREEZING HEATER Damper Heater

FREEZER LAMP 40W (1 EA)

REFRIGERATOR LAMP 40W (1 EA)

DISPENSER LAMP 15W (1 EA)

1756

898

948

685

745

796

847

1218.5

<Front View> <Plane View>

- 8 -

SPECIFICATIONS

2. Ref No. : GR-C207

ITEMS SPECIFICATIONS

DIMENSIONS (mm) 898(W)X762(D)X1756(H)

NET WEIGHT (kg) 137

COOLING SYSTEM Fan Cooling

TEMPERATURE CONTROL Micom Control

DEFROSTING SYSTEM Full Automatic

Heater Defrost

INSULATION Cyclo-Pentane

COMPRESSOR P.T.C. Starting Type

EVAPORATOR Fin Tube Type

CONDENSER Wire Condenser

REFRIGERANT R134a (180g)

LUBRICATING OIL FREOL @10G (310 cc)

CAPILLARY TUBE ID 0.83

DRIER MOLECULAR SIEVE XH-7

ITEMS SPECIFICATIONS

FIRST DEFROST 4 - 5 Hours

DEFROST CYCLE 13 - 15 Hours

DEFROSTING DEVICE Heater, Sheath

ANTI SWEAT HEATER Home Bar Heater

ANTI-FREEZING HEATER Damper Heater

FREEZER LAMP 40W (1 EA)

REFRIGERATOR LAMP 40W (1 EA)

DISPENSER LAMP 15W (1 EA)

1756

898

948

600

660

711

762

1133.5

<Front View> <Plane View>

- 9 -

SPECIFICATIONS

3. Ref No. : GR-B247

ITEMS SPECIFICATIONS

DIMENSIONS (mm) 898(W)X847(D)X1756(H)

NET WEIGHT (kg) 140

COOLING SYSTEM Fan Cooling

TEMPERATURE CONTROL Micom Control

DEFROSTING SYSTEM Full Automatic

Heater Defrost

INSULATION Cyclo-Pentane

COMPRESSOR P.T.C. Starting Type

EVAPORATOR Fin Tube Type

CONDENSER Wire Condenser

REFRIGERANT R134a (180g)

LUBRICATING OIL FREOL @10G (310 cc)

CAPILLARY TUBE ID 0.83

ITEMS SPECIFICATIONS

DRIER MOLECULAR SIEVE XH-7

FIRST DEFROST 4 - 5 Hours

DEFROST CYCLE 13 - 15 Hours

DEFROSTING DEVICE Heater, Sheath

ANTI-FREEZING HEATER Damper Heater

FREEZER LAMP 40W (1 EA)

REFRIGERATOR LAMP 40W (1 EA)

DISPENSER LAMP 15W (1 EA)

1756

898

948

685

745

796

847

1218.5

<Front View> <Plane View>

- 10 -

SPECIFICATIONS

4. Ref No. : GR-B207

ITEMS SPECIFICATIONS

DIMENSIONS (mm) 898(W)X762(D)X1756(H)

NET WEIGHT (kg) 135

COOLING SYSTEM Fan Cooling

TEMPERATURE CONTROL Micom Control

DEFROSTING SYSTEM Full Automatic

Heater Defrost

INSULATION Cyclo-Pentane

COMPRESSOR P.T.C. Starting Type

EVAPORATOR Fin Tube Type

CONDENSER Wire Condenser

REFRIGERANT R134a (180g)

LUBRICATING OIL FREOL @10G (310 cc)

CAPILLARY TUBE ID 0.83

ITEMS SPECIFICATIONS

DRIER MOLECULAR SIEVE XH-7

FIRST DEFROST 4 - 5 Hours

DEFROST CYCLE 13 - 15 Hours

DEFROSTING DEVICE Heater, Sheath

ANTI-FREEZING HEATER Damper Heater

FREEZER LAMP 40W (1 EA)

REFRIGERATOR LAMP 40W (1 EA)

DISPENSER LAMP 15W (1 EA)

1756

898

948

600

660

711

762

1133.5

<Front View> <Plane View>

- 11 -

PARTS IDENTIFICATION

Door rack

Refreshment center
(optional)

Door rack

Lower Cover

Milk product corner

Cover PWB

Cover Hinge

Home Bar

Door rack

Freezer

Compartment

Refrigerator

Compartment

Door rack

Conversion Switch

(Meats/Vegetables)

Humidity Switch

Vegetable
drawer/Meat drawer

Cover, Lamp-R/U

Shelf

Egg Box

Snack Corner

Vegetable Box

Folding Shelf

Wine Rack

Lamp

Automatic

ice maker

Shelf

(Steel,

T/Glass)

Drawer

1. Ref No. : GR-P247, GR-P207

- 12 -

PARTS IDENTIFICATION

Cover PWB

Cover Hinge

Home Bar

Door rack

Refreshment center
(optional)

Door rack

Lower Cover

Milk product corner

Door rack

Refrigerator

Compartment

Door rack

Freezer

Compartment

Conversion Switch

(Meats/Vegetables)

Humidity Switch

Vegetable
drawer/Meat drawer

Cover, Lamp-R/U

Shelf

Egg Box

Snack Corner

Vegetable Box

Folding Shelf

Wine Rack

Lamp

Automatic

ice maker

Shelf

(Steel,

T/Glass)

Drawer

2. Ref No. : GR-P247, GR-P207

- 13 -

PARTS IDENTIFICATION

Cover PWB

Cover Hinge

Lower Cover

Door rack

Door rack

Conversion Switch

(Meats/Vegetables)

Humidity Switch

Lamp

Shelf

(Steel,

T/Glass)

Drawer

Freezer

Compartment

Refrigerator

Compartment

Automatic

ice maker

Door rack

Guide bottle

Door rack

Milk product corner

Shelf

Egg Box

Snack Corner

Vegetable Box

Vegetable
drawer/Meat drawer

Cover, Lamp-R/U

Folding Shelf

Wine Rack

3. Ref No. : GR-L247, GR-L207

- 14 -

PARTS IDENTIFICATION

Conversion Switch

(Meats/Vegetables)

Cover PWB

Cover Hinge

Humidity Switch

Lamp

Shelf

(Steel,

T/Glass)

Lower Cover

Door rack

Drawer

Freezer

Compartment

Refrigerator

Compartment

Automatic

ice maker

Door rack

Shelf

Egg Box

Vegetable Box

Vegetable
drawer/Meat drawer

Door rack

Guide bottle

Wine Rack

Milk product corner

Snack Corner

Door rack

Cover, Lamp-R/U

Folding Shelf

4. Ref No. : GR-L247, GR-L207

- 15 -

PARTS IDENTIFICATION

Cover PWB

Cover Hinge

Home Bar

Conversion Switch

(Meats/Vegetables)

Humidity Switch

Lamp

Ice Bank

Assembly

Shelf

(Steel,

T/Glass)

Lower Cover

Door rack

Drawer

Freezer

Compartment

Refrigerator

Compartment

Door rack

Cover, Lamp-R/U

Shelf

Egg Box

Vegetable Box

Vegetable
drawer/Meat drawer

Door rack

Refreshment center
(optional)

Wine Rack

Milk product corner

Snack Corner

Door rack

Folding Shelf

1. Ref No. : GR-C247, GR-C207

- 16 -

PARTS IDENTIFICATION

Conversion Switch

(Meats/Vegetables)

Humidity Switch

Shelf

Egg Box

Vegetable Box

Vegetable
drawer/Meat drawer

Door rack

Lamp

Shelf

(Steel,

T/Glass)

Lower Cover

Milk product corner

Door rack

Drawer

Freezer

Compartment

Refrigerator

Compartment

Door rack

Ice Bank

Assembly

Wine Rack

Snack Corner

Folding Shelf

Cover, Lamp-R/U

Cover PWB

Cover Hinge

3. Ref No. : GR-B247, GR-B207

- 17 -

Adjusting
Screw

Driver

Height

Difference

Height
Difference

Height
Difference

Height
Difference

1

2

HOW TO INSTALL REFRIGERATOR

1. How to Adjust Door Height of Refrigerator

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

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

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

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

- 18 -

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

Valve Feed Rubber, Packing Connector, Pipe

Tape, TeflonConnector, Pipe

2. How to Install Water Pipe

■ Before Installation

1. The icemaker requires the water pressure of 1.5 -

8.5kgf/cm
180cc with water for 3 seconds)

2. Install booster pump where the city water pressure is
below 1.5kgf/cm
dispenser.

3. The total length of water pipe shall be less than 12m. Do
not bend the pipe at right angle. If the length is more
than 12m, there will be troubles on water supply due to
water pressure drop.

4. Please install water pipe where there is no heat around.

Class. Shape and Spec. Nomenclature P/No Remarks

Conve-

2

. (It is acceptable if city water fills a cup of

2

for normal operation of water and ice

Valve Feed 5221JA3001A Common Use

2-1. When connecting directly to the water tap.

■ Please confirm the following installation parts.

rtible
Water
Valve

Water
Conn­ector

Connector, (MECH) Pipe 4932JA3003B

Connector, (MECH) Pipe 4932JA3003A
Conversion Connector(3/4") 6631JA3004A

No Holes

Balance Conector(3/4") 6631JA3004B
Packing(ø24x3t) 3920JA3001B

Conversion Connector(W25) 6631JA3004C

No Holes

Balance Conectoor(W25) 6631JA3004D
Packing(ø23x3t) 3920JA3001A

Connector, (MECH) Pipe 4932JA3003C
Conversion Connector(W28) 6631JA3004E

No Holes

Balance Conector(W28) 6631JA3004F
Packing(ø26x3t) 3920JA3001C

Connector, (MECH) Pipe 4932JA3003D
Conversion Connector(1/2") 6631JA3004G No Holes
Balance Conector(1/2") 6631JA3004H
Packing(ø19x3t) 3920JA3001D

- 19 -

HOW TO INSTALL REFRIGERATOR

Single Lever Type Faucet
(general)

Feed

Valve

General Type

Feed

Valve

Two Hands Type Faucet Single Lever Type Faucet (one

hole, tech type and hand spray)

Feed

Valve

Feed

Valve

Pipe Connector B

Hot Water

Pipe Connector A

Feed

Valve

Cold Water

How to wind

Sealing Tapes.

Water Tube

Water Tube

Nut

1. Connection of Pipe Connector A and B.

1) Turn off main valve of water pipe.

2) Disconnect water tap from piping by loosening nuts.

3) Connect pipe connector A and B to piping after sealing
the pipe connector with sealing tapes.

4) Connect feed valve to pipe connector A.

5) If there is only one tap water pipe, connect pipe
connector A only and install feed pipe.

Caution : • Feed pipe should be connected to cold water

line. If it is connected to hot water line, trouble
may occur.

• Please check rubber packing when connecting
feed pipe.

2. Water Supply

1) After the installation of feed water, plug the refrigerator
to the earthered wall outlet, press the water dispenser
button for 2 - 3 minutes, and confirm that the water
comes out.

2) Check leakage at connecting part, then arrange water
tube and locate the refrigerator at its regular place if
there is no leaking.

- 20 -

HOW TO INSTALL REFRIGERATOR

Water Tube

Nut

Inlet

Outlet

Fixing Plate Fixing Plate

Fixing Cable

Water

Filter

Filter Inlet

Feed Valve

Hot Water

Cold Water

3. When customer uses bottled water.

*If customer wants to use bottled water, extra pump should be installed as shown below.

1. The pump system should not be on the floor (it may cause noise and vibration). Securely fasten the inlet and outlet
nuts of pump.

2. If there is any leakage after installation, cut the water tube at right angle and reassemble.

3. When put the water tube end into the bottle, leave a clearance between bottle bottom and water tube end.

4 Check water coming out and any leakage.

Caution : • If feed tube is more than 4m, less water will come out due to pressure drops.

• Use standard feed tube to prevent leaking.

■ Outternal Filter

1. Filter Fixation

1) Connect feed tube to the filter outlet and water valve connecting tube.

2) Fix the filter at proper place around the sink where it is easy to replace the filter and to receive the cleaning water.
Please consider the length of tube shall be less than 12m when locating filter.

3) When fixing the filter, use fixing plate and cable depending on the surrounding conditions.

2. Filter Cleaning

1) Connect feed tube to the inlet of feed valve and filter.

2) Clean the main valve and feed valve with water for at
least one minute until clean water comes out.

- 21 -

HOW TO INSTALL REFRIGERATOR

Control box

Aligning with the guide line
and the fastening indication line

Aligning with the guide line
and the loosening indication line

Control box

Separation
of red cap

Adhesion
sticker

Substitute
cap

■ 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.

■ After installing water filter

Reassemble the lamp cover and the top shelf of the
refrigerator. To place the top shelf of the refrigerator, raise

■ 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 safe to use it later 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 : Check that the guideline and the fastening

indication line are aligned.

the front part of the shelf a bit so that the hook of the shelf
is fit 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 droppings on the shelf under the filter.

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

Note : Check that the guideline and the loosening

indication line are aligned.

- 22 -

HOW TO INSTALL REFRIGERATOR

2

1

Test Switch

Confirm the amount

of water

Ice maker

Too much

Too little

Optimum level

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

3-1. Confirm the amount of water supplied to the icemaker.

1. Pull out the ice bank 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.
it may damage refrigerator or hurt hands.)

• Check the operation of motor with 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) and 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 spilt water and throw away 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)

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

- 23 -

HOW TO INSTALL REFRIGERATOR

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

icemaker.

Caution : • Please 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.

(+) Driver

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

■ Water Supplying Time Control Option

SWITCH NO Water Suppling

S/W1 S/W2 S/W3 Time

OFF OFF OFF 6.5 Sec.

ON OFF OFF 5.5 Sec.

OFF ON OFF 6 Sec.

ON ON OFF 7 Sec.

OFF OFF ON 7.5 Sec.

ON OFF ON 8 Sec.

OFF ON ON 9 Sec.

ON ON ON 10 Sec.

Caution : When adjusting the amount of water supplied,

adjust step by step. Otherwise the water may
spill over.

Switch ON

Switch OFF

ON

1

23

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

Confirm the amount

of water

Optimum level

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 water pressure (city water pressure).

3) If ice cube is too small, increase the water supplying
time. This happens when too small water is supplied into
the ice tray.

4) If ice cube sticks together, decrease the water supplying
time. This happens when too much water is supplied
into the ice tray.

- 24 -

MICOM FUNCTION

TEMP

TEMP

TEMP

TEMP

FRZ TEMP FRZ TEMP

REF TEMP

REF TEMP

DISPENSER

LOCK

SUPER FRZ

LOCK

SUPER FRZ

LOCK

ON

OFF

ROOM

TEMP

MAXMIN

MAXMIN

MAXMIN

MAXMIN

LOCK

ON

OFF

ROOM

TEMP

Dispenser selection button.

Temperature adjustment button
for refrigerator compartment.

Temperature adjustment button
for freezer compartment.

Super freezer.

Lock button.

Temperature adjustment button
for refrigerator compartment.

Temperature adjustment button
for freezer compartment.

Super freezer.

Lock button.

CRUSHED CUBED

WATER

1. Monitor Panel

1-1. GR-P247, GR-P207, GR-L247, GR-L207 1-2. GR-C247, GR-C207, GR-B247, GR-B207

2. Description of Function

2-1-1. Funnction of Temperature Selection

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

FRZ TEMP

MAXMIN

FRZ TEMP

MAXMIN

Setting
temperature

REF TEMP

MAXMIN

Temperature
Control

Freezer Control

Refrigeration
Control

Medium Medium Max Max Min Medium Min

-19 °C -22 °C -23 °C -15 °C -17 °C

3 °C2 °C0°C6 °C4 °C

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

REF TEMP

MAXMIN

❉ Whenever pressing button, setting is repeated 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 actual temperature within refrigerator.

• Refrigeration function is weak in the initial time. Please adjust temperature as above after using refrigerator for minimum
2~3 days.

FRZ TEMP

REF TEMP

FRZ TEMP

MAXMIN

REF TEMP

MAXMIN

MAXMIN

MAXMIN

FRZ TEMP

MAXMIN

REF TEMP

MAXMIN

- 25 -

MICOM FUNCTION

DISPENSER

CRUSHED CUBED

WATER

M

A

X

M

IN

M

A

XM

IN

Pressing

Switch

2-1-2. LCD Back Light Control

1. In order to easily view display status on the LCD, LCD Back Light is turned on for a minute in application of initial power,
for a minute in button manipulation and for a minute after closing time from opening time of 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. If pressing the special freezing button and the freezing temperature adjustment button for more than a second, the back
light is turned on and all the graphics of LCD are turned on. If releasing the button, the LCD graphic is displayed in the
previous status and the back light is turned off (check LCD graphic and back light ON/OFF status).

2-1-3. Outside temperature display function

1. Outside temperature sensor at the left U of refrigerator senses ambient temperature and displays the outside temperature
in the left side of “Outside temperature” text on the LCD of the display part.

2. Ambient temperature is displayed up to -9°C ~ 49°C and displayed as “Lo” for less than -10°C and as “HI” for more than
50°C. If the ambient temperature sensor fails, it is displayed as “Er”.

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

2-1-4. Lock function (display button lock)

1. In power application of refrigerator, the only “Release” text is turned on at the right side of lock graphic of LCD with the
lock release status.

2. If desiring to lock the display status and pressing the lock/release button once, “Release” text is turned off at the right side
of lock graphic of LCD and “Lock” text is turned on with lock status.

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

4. If desiring to release the lock status and pressing the lock/release button once, “Lock” text is turned off at the right side of
lock graphic of LCD and “Release” text is turned on with lock release status.

2-2. Dispenser use selection

You can select water or ice.

❉ Please select water, slice ice and square ice by pressing

button as you desire.

❉ Please press the push button lightly by catching and pushing in cup.

• The border line is indicated for the selected function.

• “Tak!” sounds if 5 seconds pass after ice comes out.

It is sound that the outlet of ice is closed.

REFERENCE : Please wait for 2-3 seconds in order to take final ice

slices or drops of water when taking out cup from the
pressing switches after taking ice or water.

2-3. Automatic ice maker

• The automatic ice maker can automatically make 8 pieces of ice cube at a time, 80 pieces a day. But these quantities may

be varied according to various conditions including 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 ice-maker, change the ice-maker switch to ON-OFF.

If you want to use automatic ice-maker again, change the switch to OFF-ON.

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

DISPENSER

- 26 -

MICOM FUNCTION

Ex) In selecting

"On"

Ex) In selecting

"Off"

SUPER FRZ

ON

OFF

ON

OFF

Ex) In selecting

"LOCK"

Ex) In selecting

"LOCK" again

LOCK

LOCK

LOCK

2-4. When ice maker does not operate smoothly

Ice is lumped together

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

them into the ice storage bin again.

• When the ice maker produces too small or lumped together ice, the amount of water supplied to the ice maker need to

adjusted. Contact the service center.

✻ If ice is not used frequently, it may lump 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. 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.

2-5. Super freezer

Please select this function for prompt freezer.

• “On” or “Off” is repeated whenever pressing button.

• The arrow mark graphic remains at the On status after flickering 4 times when

selecting Special Refrigeration “On”.

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

SUPER FRZ

2-6. Lock

This button stops operation of different button.

• Locking or Release is repeated whenever pressing the .

LOCK

• Pressing the other button when selecting ‘LOCK’, the button does not operate.

2-7. Special freezing

1. Special freezing is function to improve cooling speed of the freezing room by consecutively operating compressors and
freezing room fan. If pressing the special freezing button, “Turn Off” text of the LCD panel is turned off and “Turn On” is
immediately turned on and “Arrow ( )” graphic is turned on after flickering once.

2. Special freezing is cycled in order of Selection/ Release (“Turn On” / “Turn Off”) whenever pressing the selection button.

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

4. Temperature setting is not changed even if selecting the special freezing.

5. The change of temperature setting at the freezing room or the cold storage room is allowed with special freezing selected
and processed.

6. The cold storage room operates the status currently set with special freezing selected and processed.

7. If selecting the special freezing, the special freezing function is released after continuously operating compressor and
freezing room fan.

8. If frost removal starting time is arrived during special freezing, special freezing operation is done only for the remaining
time after completion of frost removal when the special freezing operation time passes 90 minutes. If passing 90 minutes,
special freezing operation is done only for 2 hours after completion of frost removal.

9. If pressing special freezing button during frost removal, the special freezing LCD is turned on but if pressing the special
freezing, compressor operates after the remaining time has passed.

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

11. The freezing room fan motor operates at the high speed of RPM during operation of special freezing.

compressor operates after the remaining time has passed.

- 27 -

MICOM FUNCTION

Doors of freezing /
cold storage room

or home bar

BUZZER

Closing

Opening

Within

a minute

A minute

30

seconds30seconds30seconds

Opening

Closing Closing

3 Times 3 Times 3 Times 3 Times

2-8. Control of variable type of freezing room fan

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

2. MICOM only operates in the input of initial power or special freezing operation or load response operation for the high
speed of RPM and operates in the standard RPM in other general operation.

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

4. As for monitoring of BLDC fan motor error in the freezing room, MICOM immediately stops the fan motor by determining
that the BLDC fan motor is locked or poor if there would be position signal for more than 115 seconds at the BLDC motor.
Then it displays failure (refer to failure diagnosis function table) at the display part of refrigerator, the BLDC motor doesn’t
operate more. If you want to operate the BLDC motor, turn off and on power resource.

2-9. Control of M/C room fan motor

1. The M/C room fan motor performs ON/OFF control by linking with the COMP.

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

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

2-10. 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 room or home bar opened.

2. Buzzer rings three times in the interval of 0.5 second 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 all the doors of freezing / cold storage room or home bar are closed during door open alarm, alarm is immediately
released.

2-11. Ringing of button selection buzzer

1. If pressing the front display button, “Ding ~ “ sound rings.

2-12. Ringing of compulsory operation, compulsory frost removal buzzer

1. If pressing the test button in the main PCB, “Phi ~ “ sound rings.

2. In selecting compulsory 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 compulsory 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.

- 28 -

MICOM FUNCTION

POWER

ON

COMP

ON

COMP

ON

STEP

MOTOR

DAMPER

ON

STEP

MOTOR

DAMPER

OPEN

STEP

MOTOR

DAMPER

CLOSE

HOME

BAR

HEATER

ON

POWER

ON

FROST

REMOVAL

HEATER

ON

HOME

BAR

HEATER

OFF

HOME

BAR

HEATER

ON

TEST

S/W

(Press

Once)

COMP

ON

TEST

S/W

(Press

2 times)

COMP

OFF

0.5

sec.

0.3

sec.

0.3

sec.

0.3

sec.

0.5

sec.

8

sec.

0.3

sec.

5

sec.

FROST

REMOVAL

HEATER

OFF

WATER

SUPPLY

&

DISPENSE

HEATER

ON

5

sec.

0.3

sec.

0.3

sec.

0.3

sec.

0.3

sec.

0.3

sec.

0.3

sec.

0.3

sec.

5.6

sec.

OTHER

LOAD

OFF

F-FAN

&

C-FAN

ON

F-FAN

&

C-FAN

ON

F-FAN

&

C-FAN

ON

F-FAN

&

C-FAN

OFF

FROST

REMOVAL

HEATER

ON

2-13. Frost removal function

1. Frost removal is performed whenever total operation time of compressor becomes 7 ~ 7.5 hour.

2. In providing initial power (or returning power failure), frost removal starts whenever total operation time of compressor
becomes 4 ~ 4.5 hour.

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

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

2-14. Sequential operation of built-in product

Built-in products such as compressor, frost removal heater, freezing room fan, Cooling Fan and step motor damper are
sequentially operated as follows for preventing noise and part damage occurred due to simultaneous operation of a lot of
parts in applying initial power and completing test.

Function Load Operation Sequence Remark

In applying Initial power TEST MODE

When temperature
of a frost removal
sensor becomes
more than 45°C
(In purchase,
movement)

When
temperature of a
frost removal
sensor becomes
less than 45°C
(In power failure,
service)

Test mode 1
(Compulsory
function)

Test mode 2
(Compulsory frost
removal)

If error occurs
during operation,
initial operation is
not done.

If pressing switch
once more in the
test mode 2 or
temperature of a
frost removal
sensor is more
than 5°C, it
immediately
returns to the test
mode for initial
operation
(COMP operates
after 7 minutes).

- 29 -

MICOM FUNCTION

TEMP

TEMP

OFF

ROOM

TEMP

MAXMIN

MAXMIN

CRUSHED CUBED

WATER

TEMP

TEMP

OFF

ROOM

TEMP

MAXMIN

MAXMIN

Failure Code
display Part

High quality type
(GR-P207, L207, P247, L247)

Failure Code
display Part

Basic type
GR-C247, B247, C207, B207)

C

A

B

E

C

D

A B

2-15. Failure Diagnosis Function

1. Failure diagnosis function is function to facilitate service when nonconforming matters affecting performance of product
during use of product.

2. In occurrence of failure, pressing the function adjustment button does not perform function and only alarm sound (“Ding~”) rings.

3. If nonconforming matters occurred are released during display of failure code, MICOM returns to the original state (Reset).

4. Failure code is displayed on the display part of setting 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.

●● : Normal Operation

Product operation status in failure

Freezer

Standard

Fan

M/C room

Fan

●●

RPM

Standard

●●

●●

RPM

Standard

●●

●●

RPM

Standard

●●

●●

RPM

Standard

●●

●●

RPM

Defrost

Heater

●●

●●

●●

No frost
removal

●●

Stepping

motor damper

●●

Open for 10munutes,
closing for 15 minutes

●●

●●

●●

No. Item

1

Failure of freezer
sensor

2

Failure of refrigerator
sensor 1

3

Failure of refrigerator
sensor 2

4

Failure of frost
removal sensor

5

Poor of frost
removal

Failure code display part

Setting

temperature

for freezing

Er FS

Setting

temperature for

cold storage

Snapping or short-circuit of
freezer sensor

Er RS

Snapping or short-circuit of
refrigerator sensor 1

Setting temperature

display (Note 2)

Er DS

Snapping or short-circuit of
refrigerator sensor 2

Snapping or short-circuit of frost
removal sensor

Er dH

Snapping of frost removal heater
or temperature fuse, pull-out of

Contents of failure

Compressor

ON for 15minutes

OFF for 15minutes

connector (indicated minimum 4
hours after failure occurs)

6

Failure of BLDC FAN
at freezing room

Er FF

Poor motor, hooking of wires to
fan. Contact of structures to Fan.

●●

OFF

●●

●●

●●

Snapping or short-circuit of L/wire

7

Failure of BLDC FAN
at machine room

Er CF

(if there is no fan motor signal for
more than 115 seconds in

Standard

●●

OFF

RPM

●●

●●

operation of fan motor

8

Failure of
Communication

Er CO

Connection between main PCB
and display PCB. Snapping or

Standard

●●

●●

RPM

●●

●●

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

●●

●●

●●

9

Failure of
Outside Sensor

10

Failure of ice
removal sensor

11

Failure of ice
maker unit

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

off (excluding Note1 and Note2).

Setting temperature

display (Note 1)

Setting temperature

display (Note 2)

Setting temperature

display (Note 2)

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.

- 30 -

●●

●●

●●

●●

●●

●●

MICOM FUNCTION

Note1) In error of outside sensor, setting temperature for freezing/ cold storage is normally displayed and indicated “Er” on

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

Note2) Nonconforming contents of poor R2 sensor, ice-making sensor and ice-making kit are displayed in LCD check, not

indicated on the failure display part (when pressing 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

Ice-making sensor

ICE Maker Unit

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

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

2-16. Test Function

1. The purpose of test function is to check function of the PWB and product and to search for the failure part at the failure
status.

2. Test button is placed on the main PCB of refrigerator (test switch), and the test mode will be finished after maximum 2
hours irrespective of test mode and then is reset to the normal status.

3. Function adjustment button is not perceived during performance of test mode but only warning sounds ring.

4. In finishing test mode, always pull the power cord out and then plug-in it again for the normal state.

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

6. Even if pressing the test button during failure code display, test mode will not be performed.

Other LCD graphics - ON

Mode Manipulation Content Remarks

Test 1

Test 2

Normal

Status

Press test button once
(freezing force mode)

Press test button once at
the test mode 1 status
(compulsory frost removal
mode)

Press test button once at
the test mode 2 status
(freezing force mode)

1. Continuous operation of compressor

2. Continuous operation of freezing room fan
(high speed RPM) and M/C room 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 room fan and M/C room fan is
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 operated
after 7 minutes.

- 31 -

MICOM FUNCTION

<TEST MODE 1 STATUS LCD>

<TEST MODE 2 STATUS LCD>

LOCK

TEMP

TEMP

FRZ TEMP

REF TEMP

SUPER FRZ

MAXMIN

MAXMIN

LOCK

ON

OFF

ROOM

TEMP

LOCK

FRZ TEMP

FRZ TEMP

REF TEMP

REF TEMP

DISPENSER

LOCK

SUPER FRZ

SUPER FRZ

MAXMIN

MAXMIN

MAXMIN

MAXMIN

TEMP

TEMP

FRZ TEMP

REF TEMP

DISPENSER

LOCK

SUPER FRZ

LOCK

ON

OFF

ROOM
TEMP

MAXMIN

MAXMIN

CRUSHED CUBED

WATER

✻ LCD check function: If simultaneously pressing special freezing button and cold temperature adjustment button for a

second, a back light is turned on and all display LCD graphics on. If releasing the button, the LCD
graphic displays the previous status, the back light is turned off (LCD graphic and back light ON/OFF
check).

2-17. Function of dispenser and water dispenser built-in

1. This is function allowing ice and water to come outside without opening door.

2. If pressing the dispenser switch (rubber button) after selecting ice (cube ice, crushed ice) or water, ice and water
equivalent to each come out. However, the duct doors are opened by electrical solenoid valve (Duct Door Solenoid) if
pressing the press switch in case of selecting ICE. If pressing the dispenser press switch and then detaching the hands,
the duct door is closed after it is opened for 5 seconds.

3. Function allowing ice and water to come stops if freezing room doors are opened.

4. If there is no Off signal even when 3 minutes have passed while pressing the dispenser press switch after selecting ice
(cube ice, crushed ice) or water, geared motor and solenoid (Cube, Water) is automatically turned off. However, the
solenoid (duct door) is stop 5 seconds after Off (to prevent short-circuit of a coil due to overheat of solenoid).

5. Dispenser Lamp On/Off function
Lamp on the dispenser part is turned on if pressing the dispenser press switch after selecting ice (cube ice, crushed ice)
or water. If detaching the hands, it is turned off.

6. Selection function of water/crushed/ cube ice

1) This is function to allow selection of water/crushed/ cube ice function depending on user’s selection. Display and

selection is done if pressing the dispenser selection button.

2) In the initial Power On, cube ice is automatically selected.

3) In selecting cube ice, geared motor is operated so that crushed ice can be supplied outside if pressing the press switch

when ice is formed in the ice storage container (Bank, Ice).

4) In selecting cube ice, geared motor is operated so that cube ice can be supplied outside if pressing the press switch

when ice is formed in the ice storage container (Bank, Ice).

7. Water dispenser function

1) LCD is displayed for selection if user selects water at the function adjustment part.

2) Water dispenser function is a type directly connected to a water pipe. The water solenoid valve built-in at the right side

of the M/C room is opened so that water can be supplied if selecting Water from the function adjustment part and then
pressing the press switch.

- 32 -

EXPLATION FOR MICOM CIRCUIT

1. Explanation for PWB circuit

1-1. Power circuit

1. GR-P247, L247, C247, B247 / P207, L207, C207, B207

Power circuit consists of SMPS (SWITCHING MODE POWER SUPPLY) power. The SMPS consist of the rectifying part
(BD1, CE1) converting AC voltage to DC voltage, the switching part (IC2) switching the converted DC voltage, transformer
transferring energy of the primary side of the switching terminal to the secondary side and the feedback part (IC3, IC4)
transferring it to the primary side.

Caution : Since high voltage (DC310V) is maintained at the power terminal, please take a measure after more than 3

minutes have passed after removing power cords in the abnormal operation of a circuit.

Voltage of every part is as follows:

Part VA1 CE1 CE2 CE3 CE4 CE5

Voltage 230 Vac 310 Vdc 16 Vdc 12 Vdc 16 Vdc 5 Vdc

- 33 -

EXPLATION FOR MICOM CIRCUIT

1-2. Oscillation circuit

Oscillation circuit is a circuit with the purpose of generating basic time for clock occurrence for synchronization and time
calculation in relation with information transmission/reception of inside elements of IC1 (MICOM). The OSC1 must always
use rated parts since if SPEC is changed, time calculated at the IC1 may be changed or no operation is done.

<GR-P247, L247, P207, L207> <GR-C247, B247, C207, B207>

1-3. Reset circuit

The reset circuit is circuit allowing various parts such as RAM inside of MICOM (IC1) to initialize and the whole of function to
start from the initial status, when initial power is input or when power is applied again to MICOM by a spontaneous power
failure. ‘LOW’ voltage is applied to the reset terminal of MICOM in the beginning of power supply for a constant time (10ms).
Reset terminal during general operation is 5V (No MICOM operates in failure of RESET IC).

<GR-P247, L247, P207, L207> <GR-C247, B247, C207, B207>

- 34 -

EXPLATION FOR MICOM CIRCUIT

1-4. Load/dispenser operation, door opening circuit

1. LOAD DRIVING CIRCUIT

✽ In even if opening the door of freezing room or cold storage room during operation of fan motor at the freezing room, this

circuit does not stop and operates at the standard RPM. In addition, if doors of freezing room or cold storage room, the
fan motor normally operates at the RPM previously operated.

✽ (A), (B), (C) and (D) of door switch for the freezing room or cold storage room are connected to the door open sensing

circuit in parallel toward both ends of switch to determine door open at MICOM.

✽ Since a door switch of the home bar is connected to door switch (C), (D) of the cold storage room, it senses door opening

if even one of both is opened.

✽ The fan motor is immediately stop if opening doors of the freezing room or cold storage room at the TEST mode and it

immediately operates if closing them.

1) GR-P247, L247, P207, L207

Frost

Type of Load COMP'

Measuring part (IC6) NO.16 NO.13 NO.12 NO.15 NO.14 IC7-12 IC7-10

Status

ON Within 1 V

OFF 12 V

Removal

Heater

AC

Converting

Relay

R-room

LAMP

Pipe & Disp'

Heater

Home Bar

Heater

Damper

Heater

Duct Door

Heater

- 35 -

EXPLATION FOR MICOM CIRCUIT

2) GR-C247, B247, C207, B207

✽ The fan motor at the freezing room does not stop but operates if opening doors of the freezing room or cold storage room

or the home bar during operation of the fan motor at the freezing room.

✽ (A), (B), (C) and (D) of door switch for the freezing room or cold storage room are connected to the door open sensing

circuit toward both ends of switch to determine door open at MICOM.

✽ Since a door switch of the home bar is connected to door switch (C), (D) of the cold storage room, it senses door opening

if even one of both is opened.

Type of Load COMP

Measuring part (IC6) No.16 No.11 No.10 No.15 No.14

Status

ON Within 1 V

OFF 12 V

Frost Removal

Heater

AC Converting

Relay

R-room LAMP

Home Bar

Heater

- 36 -

EXPLATION FOR MICOM CIRCUIT

2. Dispenser operation circuit

1) Check load driving status

Type of Load

Measuring part IC6-11 IC6-10 IC7-16 IC7-15 IC7-13 IC7-14

Status

2) Lever S/W sensing circuit

Measuring part

Lever S/W

On(Press)

OFF 5V

ON Within 1 V

OFF 12 V

GEARED

MOTOR

SOLENOID

CUBE

5 V

0 V

WATER VALVE

ICE WATER

IC1(Micom) (No. 16)

SOLENOID

DISPENSER

(60 Hz)

SOLENOID

- 37 -

PILOT

EXPLATION FOR MICOM CIRCUIT

3. Door opening sensing circuit

1) GR-P247, L247, P207, L207

2) GR-C247, B247, C207, B207

Measuring part

Door of Freezing/Cold Storage Room

Closing 5 V ( A - B , C - D . S/W at both ends are at Off status)

Opening 0 V ( A - B , C - D . S/W at both ends are at On status)

✽ Since door switch sensing switch (A), (B) are a separate switch even if the door switch of the freezing room normally

operates, they may fail to sense door opening in the failure of switch at both ends of (A) and (B) or in failure of the L/wire.

✽ Lamp does at the cold storage room not turn on if the door switch of the cold storage room fails to sense the door open

switch (C), (D) or the home bar switch.

- 38 -

IC1 (MICOM) No. 45, 46 Pin

EXPLATION FOR MICOM CIRCUIT

1-5. Temperature sensing circuit

1) GR-P247, L247, P207, L207

A

(R)J1

(R)J2

B

C

D

E

F

The above circuits are circuits attached to freezing room sensor or cold storage room sensor for adjusting setting
temperature at the freezing room and cold storage room, ice-making sensor for sensing water temperature in ice-making, or
an evaporator for sensing temperature of a frost removal sensor necessary for frost removal. Short or open status of every
temperature sensor is as follows:

SENSOR CHECK POINT

Freezing sensor POINT A Voltage

Frost removal sensor POINT B Voltage

Cold storage sensor 1 POINT C Voltage

Cold storage sensor 2 POINT D Voltage

Ice-making sensor POINT E Voltage

Room temperature sensor POINT F Voltage

NORMAL(-30 °C ~ 50 °C) IN

0.5 V~4.5 V 0 V 5 V

SHORT IN OPEN

- 39 -

EXPLATION FOR MICOM CIRCUIT

A

B

C

D

E

(R)J1

(R)J2

2) GR-C247, B247, C207, B207

The above circuits are circuits attached to freezing room sensor or cold storage room sensor for adjusting setting
temperature at the freezing room and cold storage room, ice-making sensor for sensing water temperature in ice-making, or
an evaporator for sensing temperature of a frost removal sensor necessary for frost removal. Short or open status of every
temperature sensor is as follows:

SENSOR CHECK POINT

Freezing sensor POINT A Voltage

Frost removal sensor POINT B Voltage

Cold storage sensor 1 POINT C Voltage 0.5 V~4.5 V 0 V 5 V

Cold storage sensor 2 POINT D Voltage

Room temperature sensor POINT E Voltage

NORMAL(-30 °C ~ 50 °C) IN

SHORT IN OPEN

- 40 -

EXPLATION FOR MICOM CIRCUIT

1-6. Switch entry circuit

The following circuits are entry circuits for sensing signal form test S/W, electronic single motor damper reed S/W for
examining refrigerator.

1) GR-P247, L247, P207, L207 2) GR-C247, B247, C207, B207

1-7. Option designation circuit (model separation function)

1) GR-P247, L247, P207, L207

2) GR-C247, B247, C207, B207

The above circuits are used for designating separation by model as option and notifying it to MICOM. Designation of option
by model and the application standards are as follows:

u These circuits are accurately pre-adjusted in shipment from factory and so you must not additionally add or remove

option.

Separation Connection Status Application Standard

OP1

Connection MAGIC/ROOM

OUT NON-MAGIC/ROOM

- 41 -

EXPLATION FOR MICOM CIRCUIT

INA

INB

A

B

A

B

CCW (Reverse rotation) (Positive rotation) CW

1-8. Stepping motor operation circuit (cold storage room, Miracle Zone)

For motor driving method, rotation magnetism is formed at coils wound on each phase of motor and stator and so motor
becomes to rotate if applying “High” signal to the IC8 (TA777AP) at the MICOM PIN 33 and outputting “High”, “Low” signal
by step numbers fixed through MICOM PIN 34 and 35,.

Explanation) For driving method of the stepping motor, send signals in the cycle of 3.33 mSEC using terminal of MICOM

PIN 33, 34 and 35 as shown in wave form of the following part.
These signals are output to the output terminal (No.10, 11, 14, 15) via the input terminal (No. 3, 6, 8) of the
IC10 (TA7774AP) as IC for motor driving. Output signals allow motor coils wound on each phase of stator to
form rotation magnetic field and the motor to rotate. Inputting as below figure to the input terminal (INA, INB)
as IC (TA7774AP) for motor driving allows motor coils wound on each phase of stator to form rotation
magnetic field and the stepping motor damper to rotate

- 42 -

EXPLATION FOR MICOM CIRCUIT

1-9. Fan motor driving circuit (freezing room, M/C room)

1. This circuit performs function to make standby power ‘0’ by cutting off power supplied to ICs inside of the fan motor in the
fan motor OFF.

2. This is a circuit to perform a temporary change of speed for the fan motor and applies DC voltage up to 7.5V ~ 16V to
motor.

3. This circuit performs function not to drive the fan motor further by cutting off power applied to the fan motor in the lock of
fan motor by sensing the operation RPM of the fan motor.

1) GR-P247, L247, P207, L207

b , d part a part c part

Motor OFF 5V 2V or less 2V or less

Motor ON 2 ~ 3V 12 ~ 14V 8 ~ 16V

a

b

c

d

- 43 -

EXPLATION FOR MICOM CIRCUIT

a

b

c

d

2) GR-C247, B247, C207, B207

- 44 -

EXPLATION FOR MICOM CIRCUIT

(R)J1

(R)J2

1-10. Temperature compensation and over-cool/weak-cool compensation circuit

1. Temperature compensation at freezing room, cold storage room

1) GR-P247, L247, P207, L207

2) GR-C247, B247, C207, B207

: JUMP WIRE

Freezing room Cold storage room

Resistance value

(R)J1 (R)J2

6.2 kΩ

5.1 kΩ
3 kΩ

2.4 kΩ

1.2 kΩ

1 kΩ

1.8 kΩ

2.7 kΩ

3.9 kΩ

5.1 kΩ

u Temperature compensation table by adjustment value (difference value against current temperature)

Ex) If changing compensation resistance at a cold storage room (RCR1) from 10 kΩ (current resistance) to 18 kΩ

(modified resistance), temperature at the cold storage will increase by +1°C.

Ex) Now (R)J1= , (R)J2=1.2kΩ, RCRI=5.6kΩ want to compensate -2°C for Freezing room temperature and

+2°C for Cold storage room temperature

Temperature Resistance value Temperature Remarks

compensation (RCR1) compensation

+5 °C 180 kΩ +2.5 °C Warmly
+4 °C 56 kΩ +2.0 °C compensate
+3 °C 33 kΩ +1.5 °C
+2 °C 18 kΩ +1.0 °C
+1 °C 12 kΩ +0.5 °C

0 °C 10 kΩ 0 °C

-1 °C 8.2 kΩ -0.5 °C

-2 °C 5.6 kΩ -1.0 °C

-3 °C 3.3 kΩ -1.5 °C

-4 °C2 kΩ -2.0 °C Coolly

-5 °C 470 Ω -2.5 °C compensate

Reference temperature

(R)J1 = 12kΩ 1kΩ
(R)J2 = 12kΩ
RCRI = 5.6kΩ 18kΩ

- 45 -

EXPLATION FOR MICOM CIRCUIT

u Temperature compensation table at the cold storage room is as follows:

Modification

resistance

Current
resistance

470Ω

3.3 kΩ

5.6 kΩ

Cold storage

room

(RCR1) 10 kΩ

8.2 kΩ

12 kΩ

2 kΩ

470 Ω 2 kΩ 3.3 kΩ 5.6 kΩ 8.2 kΩ 10 kΩ 12 kΩ 18 kΩ 33 kΩ 56 kΩ 180 kΩ

No 0.5 °C1 °C 1.5 °C2 °C 2.5 °C3 °C 3.5 °C4 °C 4.5 °C5 °C

change

0.5 °C No 0.5 °C1 °C 1.5 °C2 °C 2.5 °C3 °C 3.5 °C4 °C 4.5 °C
Down change

1 °C 0.5 °C No 0.5 °C1 °C 1.5 °C2 °C 2.5 °C3 °C 3.5 °C4 °C

Down

1.5 °C1 °C 0.5 °C No 0.5 °C1 °C 1.5 °C2 °C 2.5 °C3 °C 3.5 °C

Down Down Down

2 °C 1.5 °C1 °C 0.5 ° No 0.5 °C1 °C 1.5 °C2 °C 2.5 °C3 °C

Down Down Down

2.5 °C2 °C 1.5 °C1 °C 0.5 °C No 0.5 °C1 °C 1.5 °C2 °C 2.5 °C

Down Down Down Down Down

3 °C 2.5 °C2 °C 1.5 °C1 °C 0.5 °C No 0.5 °C1 °C 1.5 °C2 °C

Down Down Down Down Down Down

Up Up Up Up Up Up Up Up Up Up

Up Up Up Up Up Up Up Up Up

Down

change

Up Up Up Up Up Up Up Up

change

Drop

Up Up Up Up Up Up Up

change

Up Up Up Up Up Up

change

Up Up Up Up Up

change

Up Up Up Up

3.5 °C3 °C 2.5 °C2 °C 1.5 °C1 °C 0.5 °C No 0.5 °C1 °C 1.5 °C

18 kΩ

33 kΩ

56 kΩ

180 kΩ

u This circuit is a circuit to enter the necessary level of temperature compensation for adjusting different temperature every

model at the cold storage room into MICOM.

Down Down Down Down Down Down Down

4 °C 3.5 °C3 °C 2.5 °C2 °C 1.5 °C1 °C 0.5 °C No 0.5 °C1 °C

Down Down Down Down Down Down Down Down

4.5 °C4 °C 3.5 °C3 °C 2.5 °C2 °C 1.5 °C1 °C 0.5 °C No 0.5 °C

Down Down Down Down Down Down Down Down Down

5 °C 4.5 °C4 °C 3.5 °C3 °C 2.5 °C2 °C 1.5 °C1 °C 0.5 °CNo

Down Down Down Down Down Down Down Down Down Down

change

Up Up Up

change

Up Up

change

Up

change

- 46 -

EXPLATION FOR MICOM CIRCUIT

u Temperature compensation table at the freezing room is as follows:

Change

J1: 5.1 kΩ J1: 3.9 kΩ J1: 2.7 kΩ J1: 1.8 kΩ J1: 910 Ω J1: . J1: . J1: . J1: . J1: . J1: .

resistance

Now
resistance

J1: 5.1 kΩ

J2:

J2: . J2: . J2: . J2: . J2: . J2: . J2: 1.2 kΩ J2: 2.4 kΩ J2: 3 kΩ J2: 5.1 kΩ J2: 6.2 kΩ

Not

.

compensate

1 °C ↑ 2 °C ↑ 3 °C ↑ 4 °C ↑ 5 °C ↑ 6 °C ↑ 7 °C ↑ 8 °C ↑ 9 °C ↑ 10 °C ↑

Freezing

room

[(R)J1, (R)J2]

J1: 3.9 kΩ
J2:

J1: 2.7 kΩ
J2:

J1: 1.8 kΩ
J2:

J1: 910 Ω

J2:

J1:
J2:

J1:

J2: 1.2 kΩ

J1:

J2: 2.4 kΩ

J1:

J2: 3 kΩ

J1:

J2: 5.1 kΩ

J1:

J2: 6.2 kΩ

1 °C ↓

.

2 °C ↓ 1 °C ↓

.

3 °C ↓ 2 °C ↓ 1 °C ↓

.

4 °C ↓ 3 °C ↓ 2 °C ↓ 1 °C ↓

.

.

5 °C ↓ 4 °C ↓ 3 °C ↓ 2 °C ↓ 1 °C ↓

.

.

6 °C ↓ 5 °C ↓ 4 °C ↓ 3 °C ↓ 2 °C ↓ 1 °C ↓

.

.

7 °C ↓ 6 °C ↓ 5 °C ↓ 4 °C ↓ 3 °C ↓ 2 °C ↓ 1 °C ↓

.

.

8 °C ↓ 7 °C ↓ 6 °C ↓ 5 °C ↓ 4 °C ↓ 3 °C ↓ 2 °C ↓ 1 °C ↓

.

.

9 °C ↓ 8 °C ↓ 7 °C ↓ 6 °C ↓ 5 °C ↓ 4 °C ↓ 3 °C ↓ 2 °C ↓ 1 °C ↓

.

.

10 °C ↓ 9 °C ↓ 8 °C ↓ 7 °C ↓ 6 °C ↓ 5 °C ↓ 4 °C ↓ 3 °C ↓ 2 °C ↓ 1 °C ↓

.

Not

compensate

compensate

1 °C ↑ 2 °C ↑ 3 °C ↑ 4 °C ↑ 5 °C ↑ 6 °C ↑ 7 °C ↑ 8 °C ↑ 9 °C ↑

Not

1 °C ↑ 2 °C ↑ 3 °C ↑ 4 °C ↑ 5 °C ↑ 6 °C ↑ 7 °C ↑ 8 °C ↑

Not

compensate

1 °C ↑ 2 °C ↑ 3 °C ↑ 4 °C ↑ 5 °C ↑ 6 °C ↑ 7 °C ↑

Not

compensate

1 °C ↑ 2 °C ↑ 3 °C ↑ 4 °C ↑ 5 °C ↑ 6 °C ↑

Not

compensate

1 °C ↑ 2 °C ↑ 3 °C ↑ 4 °C ↑ 5 °C ↑

Not

compensate

1 °C ↑ 2 °C ↑ 3 °C ↑ 4 °C ↑

Not

compensate

1 °C ↑ 2 °C ↑ 3 °C ↑

Not

compensate

1 °C ↑ 2 °C ↑

Not

compensate

1 °C ↑

Not

compensate

- 47 -

EXPLATION FOR MICOM CIRCUIT

2. Compensation circuit for weak-cold, over-cold at freezing room

1) GR-P247, L247, P207, L207 2) GR-C247, B247, C207, B207

Temperature compensation in CUT

JCR1 +1 °C

JCR2 +1 °C

JCR3 -1 °C

JCR4 -1 °C

+2 °C

-2 °C

Compensation Compensation

for weak-cold for over-cold

JCR3 JCR4 JCR1 JCR2

CUT -1 °C

CUT -1 °C

CUT +1 °C

CUT +1 °C

CUT CUT -2 °C

CUT CUT +2 °C

CUT CUT 0 °C

CUT CUT 0 °C

CUT CUT 0 °C

CUT CUT 0 °C

CUT CUT CUT -1 °C

CUT CUT CUT +1 °C

CUT CUT CUT CUT 0 °C

Temperature compensation value

at cold storage room

0 °C (In shipment from factory)

Remarks

u The above option circuit is a circuit to compensate for temperature at the cold storage room by simply cutting in service.

- 48 -

EXPLATION FOR MICOM CIRCUIT

PCB ASSEMBLY DISPLAY

CRUSHED CUBED

WATER

TEMP

TEMP

FRZ TEMP

REF TEMP

DISPENSER

LOCK

SUPER FRZ

OFF

ROOM

TEMP

MAXMIN

MAXMIN

Main MICOM LCD dedicated MICOM

DC 12V

GND

Transmission (error status)

Reception (notch status)

Main PCB L/W ire FD/H(4-wires) Display PCB

1-11. Communication circuit and connection L/Wire between main PCB and display PCB

The following circuit is a communication circuit used for exchanging the necessary information between main MICOM of
main PCB and LCD dedicated MICOM for LCD control of display PCB.

Transmission/receipt L/Wire together with the necessary display PCB for driving the display PCB is required.

Poor communication occurs if a continuous information exchange fail to continue for more than 2 minutes between main
MICOM of main PCB and LCD dedicated MICOM for LCD control of display PCB.

1) GR-P247, L247, P207, L207

- 49 -

EXPLATION FOR MICOM CIRCUIT

2) GR-C247, B247, C207, B207

FRZ TEMP

REF TEMP

TEMP

TEMP

2. Sensor resistance characteristics table

Measuring T emperature (°C) Freezing Sensor

-20 °C 22.3 kΩ 77 kΩ

-15 °C 16.9 kΩ 60 kΩ

-15 °C 13.0 kΩ 47.3 kΩ

-5 °C 10.1 kΩ 38.4 kΩ
0 °C 7.8 kΩ 30 kΩ

+5 °C 6.2 kΩ 24.1 kΩ
+10 °C 4.9 kΩ 19.5 kΩ
+15 °C 3.9 kΩ 15.9 kΩ
+20 °C 3.1 kΩ 13 kΩ
+25 °C 2.5 kΩ 11 k Ω
+30 °C 2.0 kΩ 8.9 kΩ
+40 °C 1.4 kΩ 6.2 kΩ
+50 °C 0.8 kΩ 4.3 kΩ

MAXMIN

ROOM

TEMP

MAXMIN

Frost removal sensor, Outside sensor

OFF

Cold storage sensor 1, 2.

SUPER FRZ

LOCK

u Resistance value allowance of sensor is ±5%.
u In measuring resistance value allowance of sensor, perform measuring after leaving the sensor for more than 3 minutes

at the measuring temperature (delay is required due to sense speed relation relationship).

u Since an analog tester has a large measuring temperature, measuring with a digital tester is required as possible as.
u Resistance of the cold storage sensor 1 and 2 shall be measured with a digital tester after separating CON8 of the PWB

ASSEMBLY and the MAIN part.

u Resistance of the freezing sensor shall be measured with a digital tester after separating CON7 of the PWB ASSEMBLY

and the MAIN part.

- 50 -

EXPLATION FOR MICOM CIRCUIT

3. PWB parts diagram and list

3-1. PWB Assembly main part diagram

1. GR-P247, L247, P207, L207

- 51 -

EXPLATION FOR MICOM CIRCUIT

2. GR-C247, B247, C207, B207

- 52 -

EXPLATION FOR MICOM CIRCUIT

3-2. Parts list

1. GR-P247, L247, P207, L207

- 53 -

EXPLATION FOR MICOM CIRCUIT

- 54 -

EXPLATION FOR MICOM CIRCUIT

2. GR-C247, B247, C207, B207

- 55 -

EXPLATION FOR MICOM CIRCUIT

- 56 -

EXPLATION FOR MICOM CIRCUIT

DOUBLE SIDE TAPE

SPREAD SHEET

3-3. DISPLAY ASSEMBLY part diagram

1. GR-P247, L247, P207, L207

- 57 -

EXPLATION FOR MICOM CIRCUIT

DOUBLE SIDE TAPE

SPREAD SHEET

2. GR-C247, B247, C207, B207

- 58 -

3-4. DISPLAY circuit diagram

Parts without ( ) mark means SMD parts.

Reception

Transmission

1. GR-P247, L247, P207, L207

- 59 -

2. GR-C247, B247, C207, B207

Reception

Transmission

Parts without ( ) mark means SMD parts.

- 60 -

EXPLATION FOR MICOM CIRCUIT

4. PWB circuit diagram - PWB circuit diagram may vary a little bit depending on actual condition.

1. GR-P247, L247, P207, L207

- 61 -

EXPLATION FOR MICOM CIRCUIT

PCB ASSEMBLY DISPLAY

PCB ASSEMBLY MAGIC DISPLAY

- 62 -

EXPLATION FOR MICOM CIRCUIT

2. GR-C247, B247, C207, B207

- 63 -

EXPLATION FOR MICOM CIRCUIT

PCB ASSEMBLY DISPLAY

PCB ASSEMBLY MAGIC DISPLAY

- 64 -

ICE MAKER AND DISPENSER OPERA TION PRINCIPLE AND REPAIR METHOD

• Level Ice Maker Cube Mould for “Initial Control”
after power is input.

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 ice maker starts operation.

• Check ice bank is full of ice by rotating ice ejection
motor in normal and reverse direction and eject ice into
the ice bank if ice bank 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 ice maker
cube mould by operating water valve.

1. Working Principles

1-1. Ice Maker Working Principles

1-2. Dispenser Working Principles

1. This function is available in Model GR-P247, GR-P207 and GR-L247, GR-L207 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 rubber button is pressed and vice versa.

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

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

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

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

- 65 -

ICE MAKER AND DISPENSER OPERA TION PRINCIPLE AND REPAIR METHOD

2. Function of Ice Maker

2-1. Initial Control Function

1. When power is initially applied or reapplied after power cut, it detects level of ice maker cube mould after completion of
MICOM initialization. The detecting lever moves up and down.

2. The level of ice maker cube mould is judged by output signal, high and low signal, of Hall IC. Make the cube mould to be
horizontal by rotating ice ejection motor in normal or reverse direction so that High/Low signal can 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 check
the signal every hour. It resets initialization of icemaker when it becomes normal.

4. It judges that the initial control is completed when it judges the ice maker cube mould is horizontal.

5. Ice ejection conducts for 1 cycle irrespect of ice in the ice bank when power is initially applied.

2-2. Water Supply Control Function

1. This is to supply water into the ice maker cube mould by operating water valve in the machine room when ice ejection
control is completed and ice maker mould is even.

2. The quantity of water supplied is determined by DIP switch and time.

<Water Supply Quantity Table>

No

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.

3. If water supply quantity setting is changed while power is on, water supplies for the amended time. If DIP switch is
changed during water supply, water shall be supplied for the previous setting time. But it will supply for the amended time
from the next supply.

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

DIP SWITCH SETTING

S/W 1 S/W 2 S/W 3

WATER SUPPLY TIME REMARKS

* 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 switch is on the main PWB.

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
ice maker cube mould)

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

3. It is judged that ice making is completed when ice making sensor temperature reaches at -8°C after 100 minutes when
water is supplied to ice maker cube mould.

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

- 66 -

ICE MAKER AND DISPENSER OPERA TION PRINCIPLE AND REPAIR METHOD

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

2-4. Ice Ejection Control Function

1. This is to eject ice from ice maker 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 ice
ejection but waits. If the ice bank is full, ice ejection motor rotates in normal direction in every hour to check the condition
of ice bank. If the ice bank is not full, the water supply control starts after completion of ice ejection control. If the ice bank
is full, ice ejection motor rotates in reverse direction and sops under ice making or waiting conditions.

3. If ice bank is not full, ice ejection starts. The cube mould tilts to the maximum and ice is separated from the mould and 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 rotates 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 exercise initial operation. It
resets the ice maker if ice ejection motor or Hall IC is normal.

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

7. The mould returns to horizontal conditions as ice ejection motor rotates in reverse direction.

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

<Timing Chart During Ice Ejection>

- 67 -

ICE MAKER AND DISPENSER OPERA TION PRINCIPLE AND REPAIR METHOD

2-5 Test Function

1. It is to force the operation during operation test, service, and cleaning. The test switch is mounted under the automatic
ice maker. 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 it is in the horizontal conditions. If mould is
full of ice during test function operation, ice ejection control and water supply control do not work.

3. When test switch is pressed for more than 0.5 second in the horizontal conditions, ice ejection starts irrespect of the
mould conditions. Water shall be splashed 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. Therefore the problems of ice ejection,
returning to the horizontal conditions, and water supply can be checked by test switch. When test function performs
normally, buzzer sounds and water supply shall carry out. Check it for repair if buzzer does not sound.

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

5. Remove ice from the ice maker cube mould and press test switch when ice maker cube mould is full of ice as ice ejection
and water supply control do not work when cube mould is full of ice.

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 protect water drop when freezer door is open.

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

- 68 -

ICE MAKER AND DISPENSER OPERA TION PRINCIPLE AND REPAIR METHOD

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 ice making sensor

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

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

Replace Ice making
Sensor

Is Crushed Ice LCD off during

troubleshooting check?

Failed Ice Maker 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 Ice Maker 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 ice maker 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 Ice maker 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

3. Ice Maker Troubleshooting

* Troubleshooting: it is possible to confirm by pressing freezer and refrigerator temperature control buttons for more

than 1 second. (ice maker is normal if all leds are on): refer to trouble diagnposis function in MICOM
function 2-8 (page 18)

- 69 -

ICE MAKER AND DISPENSER OPERA TION PRINCIPLE AND REPAIR METHOD

4. Ice maker circuit part

The above ice maker circuit is applied to the GR-P247/207, GR-L247/207 and consists of the ice maker unit part installed at
the freezing room and the ice maker driving part of the main PWB.

Water supply to the ice maker container is done by opening the valve for the established water supply time by operating the
container via a solenoid relay for the ice valve of the solenoid valve placed at the M/C room. If the water supply time is
elapsed, water supply is automatically stop. This circuit is a circuit for implementing function such as ice removal, ice-full
detection, horizontal balancing and sense of ice-making temperature for the ice-maker container. Since ice-making
temperature sense is same as in the temperature sense circuit part of the main PWB, refer to it.

Test switch input detection of the ice-maker 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 performed if pressing the test switch
installed at the automatic ice-maker itself for more than 0.5 second.

2. The test switch operates in the horizontal status and test function is not input in the water supply operation. Ice removal
control and water supply control is not performed if full-ice is arrived 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
irrespective of the generation conditions of ice at the ice-making tray. Therefore, care is required since water may
overflow if operating test function in the water state that ice-making is not done. A cycle of water supply is performed in
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 function is normally performed, “Ding~” buzzer sound
rings and water supply control is performed. Thus, no ringing of “Ding~” buzzer sound means failure and repair check
must be performed.

4. If water supply is completed, operation in the normal cycle of “ice making → ice removal → returning to horizontal status
→ water supply”.

- 70 -

CIRCUIT

- 71 -

CIRCUIT

- 72 -

TROUBLE DIAGNOSIS

1. Trouble Shooting

CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK

1. Faulty start

1) No power on outlet.

2) No power on cord.

Bad connection between adapter and outlet. (faulty adapter)

The Inner diameter of adapter.
The distance between holes.
The distance between terminals.
The thickness of terminal.

Bad connection between plug and adapter (faulty plug).

The distance between pins.
Pin outer diameter.

3) Shorted start circuit.
No power on

power cord.

Disconnected copper wire.

Internal electrical short.

Faulty terminal contact.

Disconnected.

Weak connection.
Short inserted cord length.
Worn out tool blade.

Power cord is disconnected.

Faulty soldering.

Loose contact.

- Large distance between
male terminal.

- Thin female terminal.

Terminal disconnected.

Bad sleeve assembly.

* Measuring instrument :

Multi tester

■ Check the voltage.
If the voltage is within ±85%
of the rated voltage, it is OK.

■ Check the terminal
movement.

■

Check both terminals of
power cord.
Power conducts : OK.
No power conducts : NG

O.L.P is off.

No electric power on compressor. - Faulty compressor.

Faulty PTC.

4) During defrost.

Capacity of O.L.P is small.

Characteristics of O.L.P is bad.

Bad connection.

Power is
disconnected.

Power does not conduct. - Damage.

Bad characteristics. - Initial resistance is big.

Bad connection with
compressor.

Bad terminal connection.

Start automatic defrost.
Cycle was set at defrost when the refrigerator

was produced.

Inner Ni-Cr wire blows out.
Bad internal connection.
Faulty terminal caulking (Cu wire is cut).
Bad soldering.

Too loose.
Assembly is not possible.

■ Check both terminals of
O.L.P.
If power conducts : OK.
If not : NG.

■ Check the resistance of both
terminals.
At normal temperature 6 :
OK.
If disconnected : ∞.

- 73 -

TROUBLE DIAGNOSIS

CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK

2. No cooling.

2) Refrigeration system is clogged.

Moisture
clogged.

No electric
power on
therm­ostat.

Weld joint
clogged.

Drier cloggeing.

Residual moisture

in the evaporator.

Residual moisture.

Insufficient drier
capacity.

Residual moisture
in pipes.

Moisture penetration - Leave it in the air. - Moisture penetration.
into the refrigeration oil.

Short pipe insert.

Pipe gaps.

Too much solder.

Too large.
Damaged pipes.

The capillary tube inserted depth. - Too much.

Capillary tube melts. - Over heat.

Clogged with foreign materials.

Reduced cross section by cutting. - Squeezed.

Air Blowing.

Leave it in the air.

Caps are missed.

Not dried in the compressor.
Elapsed more than 6 months after drying
Caps are missed.
No pressure when it is open.

Dry drier - Drier temperature.

Leave it in the air.

Caps are missed.

Air blowing.

Not performed.
Too short.
Impossible moisture

confirmation.
Low air pressure.

During rest time.

After work.

Check on package
condition.

Good storage after
finishing.

During transportation.
During work.

Not performed.
Performed.

Too short time.
Low air pressure.
Less dry air.

Desiccant powder.
Weld oxides.
Drier angle.

■ Check the clogged
evaporator by heating (as
soon as the cracking sound
begins, the evaporator start
freezing)

■ The evaporator does not cool

from the beginnig (no evidece
of misture attached).
The evaporator is the same
as before even heat is
applied.

Foreign material clogging.

Compressor cap is disconnected.
Foreign materials are in the pipe.

- 74 -

TROUBLE DIAGNOSIS

CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK

3. Refrigeration
is weak.

1) Refrigerant Partly leaked.

2) Poor defrosting capacity.

Drain path (pipe) clogged.

Defrost heater does not
generate heat.

Weld joint leak.
Parts leak.

Inject P/U into drain hose.

Foreign materials
penetration.

Cap drain is not disconnected.

Parts
disconnected.

P/U lump input.
Screw input.
Other foreign materials

input.

Heater
Sheath

Wire is cut.

Dent by fin evaporator.
Heating wire is corroded

Bad terminal connection.

Inject through the
hole.

Seal with drain.

- Lead wire.

- Heating wire.

- Contact point
between heating and
electric wire.

- Water penetration.

■ Check visually.

■ Check terminal

Conduction: OK.
No conduction: NG.
If wire is not cut, refer to
resistance.
P=Power
V=Voltage
R=Resistance

2

V

P= —

R

2

V

R= —

P

- 75 -

TROUBLE DIAGNOSIS

CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK

3. Refrigeration
is weak.

Residual
frost.

No automatic defrosting.

Defrost does not return.

Weak heat from heater.

Too short defrosting time. Defrost Sensor.

Structural fault. Gasket gap.

Sheath Heater - rated.
Heater plate - rated.

- Faulty characteristics.

Seat-D(missing, location. thickness).

Air inflow through the fan motor.

Bad insulation of case door.

3) Cooling air leak.
Bad gasket adhestion

Door sag.

4) No cooling air circulation.

Faulty fan motor.

Bad adhesion.
Weak binding force at hinge.

Gap.
Bad attachment.
Contraction.

Fan motor.

Door switch.

Self locked.
Wire is cut.
Bad terminal contact.

Faults.

Refrigerator and freezer switch reversed.
Button is not pressed.

Contact distance.
Button pressure.
Melted contact.
Contact.

Poor door
attachment.
Door liner
(dimension).
Contraction inner
liner.
Misalignment.
Bad terminal
connection.
P/U liquid leak.

■ Check the fan motor
conduction: OK.
No conduction: NG.

- 76 -

TROUBLE DIAGNOSIS

CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK

3. Refrigeration
is weak.

4) No cooling air circulation.

Faulty fan motor.

Small cooling air
discharge.

5) Compressor capacity.

Fan is
constrained.

Insufficient
motor RPM

Faulty fan.

Shorud. Bent.

Ice and foreign materials on rotating parts.

Fan shroud contact. - Clearance.
Damping evaporator contact.
Accumulated residual frost.

Fan overload. - Fan misuse.
Bad low termperature RPM characteristics.
Rated power misuse.
Low voltage.

Fan misuse.
Bad shape.
Loose connection. - Not tightly connected.
Insert depth.

Rating misuse.
Small capacity.
Low valtage.

6) Refrigerant
too much or too little.

7) Continuous operation

- No contact of temperature controller. - Foreign materials.

8) Damper opens continuously.

Foreign materials
jammed.

Failed sensor. - Position of sensor.
Characteristics

of damper.

9) Food storing place. - Near the outlet of cooling air.

Malfunction of charging cylinder.
Wrong setting of refrigerant.
Insufficient compressor. - Faulty compressor.

P/U liquid dump.
EPS water sediment.
Screw.

Bad characteristics of its own temperatue.
Parts misuse.
Charge of temperature - Impact.

characteristics.

■ Check visually after
disassembly.

■ Check visually after
disassembly.

- 77 -

TROUBLE DIAGNOSIS

CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK

4. Warm
refrigerator
compartment
temperature.

5. No automatic
operation.
(faulty

contacts.)

1) Colgged cooling path.

P/U liquid leak.
Foreign materials. –– P/U dump liquid.

2) Food storate.

1) Faulty temperature sensor in freezer or refrigerator compartment.

Faulty contact.
Faulty temperature characteristics.

2) Refrigeration load is too much.

3) Poor insulation.

4) Bad radiation.

5) Refrigerant leak.

6) Inadequate of refrigerant.

7) Weak compressor discharging power.

8) Fan does not work.

9) Button is positioned at "strong."

Store hot food.
Store too much at once.
Door open.
Packages block air flow.

Food.

Frequent opening and closing.
Cool air leak.
Poor door close. – Partly opens.

High ambient temperature.
Space is secluded.

Too much food.
Hot food.

Different rating.
Small capacity.

■ Inspect parts measurements
and check visually.

6. Dew and
ice formation.

1) Ice in freeezer compartment.
External air inflow. –– Rubber motor assembly direction(reverse).

Door opens
but not closes.

Gap around gasket. –– Contraction, distortion, loose, door twisted, corner not

Food vapor. –– Storing hot food. –– Unsealed food.

2) Condensation in the refrigerator compartment.
Door opens
but not closes.

Gasket gap.

3) Condensation on liner foam.
Cool air leak

and transmitted.

Weak door closing power.
Stopper malfunction.
Door sag.
Food hinders door closing.

fully inserted.

Insufficient closing.
Door sag.
Food hinders door closing.

Not fully filled.

Flange gap. –– Not sealed.
Gasket gap.

Toop table part.
Out plate R/L part.

- 78 -

TROUBLE DIAGNOSIS

CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK

6. Dew and
ice formation.

4) Dew on door.
Dew on the duct door. - Duct door heater is cut.
Dew on the dispense

recess.

Dew on the door surface. Not fully filled. Surface.

Dew on the
gasket surface.

5) Water on the floor.
Dew in the refrigerator compartment.
Defrosted water overflows. Clogged discharging hose.
Discharging hose Evaporation tray located at wrong place.
location.
Tray drip. Damaged.

Position of drain.

Recess Heater is cut.
Duct door is open. / Foreign material clogging.

Cormer.

P/U liquid contraction.

Bad wing adhesion. Wing sag(lower part).

Door liner shape mismatch.

Corner. Too much notch.

Broken.

Home Bar heater is cut.

Breaks, holes.
Small Capacity.

Liquid shortage.
Liquid leak.

7. Sounds

1) Compressor compartment operating sounds.
Compressor sound Sound from machine itself.

inserted. Sound from vibration.

Restrainer.
Rubber Too hard.
seat. Distorted.

Aged.
Burnt.

Stopper. Bad Stopper Not fit

assembly. (inner

Compressor base not connected.
Bad welding compressor stand(fallen).
Foreign materials in the compressor

compartment.

O.L.P.

sound.

Capacitor noise.
Pipe sound.

Chattering
Insulation paper vibration.

Pipe contacts each other. – Narrow interval.

Capillary tube unattached.

sound.

diameter

of stopper).
Tilted.
Not

- 79 -

TROUBLE DIAGNOSIS

CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK

7. Sounds

1) Compressor compartment operating sounds.
Transformer

Drip tray vibration sound.

Back cover machine sound.

Condenser drain sound.

2) Freezer compartment sounds.
Fan motor sound.

Sounds from fan
contact.

Unbalance fan sounds.

sound.

Its own fault. –– Core gap.
Bad connection. –– Correct screw connection.

Bad assembly.
Distortion.
Foreign materials inside.

Bad connection.
Partly damaged.

Not connected.
Bad pipe caulking.

Normal operating sound.
Vibration sound.

Fan guide contact.
Shroud burr contact.
Damping evaporator contact.
Residual frost contact.

Unbalance.

Aged rubber seat.
Bad torque for assembling motor
bracket.

Poor treatment Cord heater.
Narrow evaporator interval.

Surface machining conditions.
Fan distortion.
Misshappen.
Burr.

Ice on the fan. –– Air intake (opposite to motor

Motor shaft
contact sounds.

Resonance.
Evaporator noise.

3) Bowls and bottles make contact on top shelf.

4) Refrigerator roof contact.

5) Refrigerator side contact.

6) Insufficient Lubricants on door hinge.

Supporter disorted.
Tilted during motor assembly.

Evaporator pipe contact. –– No damping evaporator.
Sound from refrigerant. –– Stainless steel pipe shape in

Sound from fin evaporator and pipe during expansion
and contraction.

rubber assembly.)

accumulator.

- 80 -

TROUBLE DIAGNOSIS

CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK

8. Faulty lamp
(freezer and

refrigerator
compartment).

9. Faulty internal
voltage(short).

1) Lamp problem. Filament blows out.
Glass is broken.

2) Bad lamp assembly. Not inserted.
Loosened by vibration.

3) Bad lamp socket.

Disconnection. Bad soldering.

Bad rivet contact.

Short. Water penetration. Low water

level in tray.

Bad elasticity of contact.
Bad contact(corrosion).

4) Door switch. Its own defect.

Refrigerator and freezer switch is reversed.
Travlel distance.
Bad connection.
Bad terminal contact.
P/U liquid leak..

1) Lead wire is damaged.

Wire damage when assembling P.T.C. Cover.
Outlet burr in the bottom plate.
Pressed by cord heater. lead wire, evaporator pipe.

2) Exposed terminal.

Compressor Compartment terminal. - Touching other

components.

Freezer compartment terminal. - Touching evaporator pipe.

3) Faulty parts.

Transformer. Coil contacts cover.

Welded terminal parts contact cover.
Compressor. Bad coil insulation.
Plate heater.
Melting fuse. Sealing is broken. Moisture penetration.
Cord heater. Pipe damaged. Moisture penetration.

Bad sealing.
Sheath heater.

■ Connect conduction and
non-conduction parts and
check with tester.
Conduction: NG.
Resistance∞: OK.

- 81 -

TROUBLE DIAGNOSIS

CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK

10. Structure,
appearance
and others.

1) Door foam.
Sag.

Weak torque of
hinge connection.

Weak gasket
adhesion.
Fixed tape.

Bolt is loosened during
transportaion.
Not tightly fastened.
Screw worn out .
Adhesion surface.

Not well fixed.

Noise during
operation.

Malfunction.

2) Odor.
Temperature of

refrigerator
compartment.

Deodorizer.

Food Storage.

Others.

Hinge interference.

Not closed Interference between door liner and inner liner.
Refrigerator
compartment is
opened when freezer
compartment is
closed (faulty stopper).

High. Faulty damper control.

No deodorizer.
Poor capacity.

Seal condition.
Store special odorous food.
Long term storage.

Odors from chemical procucts.

Bigger door foam.
Hinge-Pin tilted-Poor flatness.
No washer.
No grease and not enough
quantity.

Stopper worn out.
Bad freezer compartment door
assembly.
No stopper.

Button is set at "weak".
Door is open (interference by
food).

- 82 -

-83-

2. Faults

2-1. Power

Problems Causes Checks Measures Remarks

No power on - Power cord cut. - Check the voltage with tester. -Replace the components.

outlet. - Faulty connector insertion. - Check visually. -Reconnect the connecting parts.

- Faulty connection between plug - Check visually. - Reconnect the connecting parts.

and adapter.

Fuse blows out. - Short circuit by wrong connection. - Check the fuse with tester - Find and remove the cause of - Replace with rated

- Low voltage products are or visually. problem(ex. short, high voltage, fuse after confirming

connected to high voltage. - Check the input volt are with tester low voltage). its specification.

- Short circuit by insects. (between power cord and products). - Replace with rated fuse.

- Electricity leakage. - Check the resistance of power cord ■ If fuse blowns out

- High voltage. with testerf (if it is 0Ω, it is shorted). frequently, reconfirm

- Short circuit of components the cause and prevent.

(tracking due to moisture and dust

penetration).

2-2. Compressor

TROUBLE DIAGNOSIS

Problems Causes Checks Measures Remarks

Compressor - Faulty PTC. - Check the resistance. - If resistance is infinite, replace it

does not Vlaue:∞ is defective. with new one.

operate. - If it is not infinite, it is normal.

- Check other parts.

- Compressor is frozen. - If compressor assembly parts are - During forced operation:

normal(capacitor, PTC, OLP), - Operates: Check other parts.

apply power directly to the - Not operate: Replace the frozen

compressor to force operation. compressor with new one, weld,

Auxiliary winding

Main winding

Power

OLP It starts as soon as it is • Refer to weld repair procedures.

contacted.

evacuate, and recharge refrigerant.

-84-

2-3. Temperature

Problems Causes Checks Measures Remarks

High Poor cool air circulation due to faulty - Lock –– Check resistance with a - Replace fan motor.

temperature fan motor. tester.

in the freezer 0Ω: short.

compartment. ∞Ω: cut. - Reconnect and reinsert.

- Rotate rotor manually and check

rotation.

- Wire is cut.

- Bad terminal contact: Check - Maintain clearance and remove ice

terminal visually. (Repair and/or replace shroud if fan

- Fan constraint. – Fan shroud is constrained by shroud

contact: Confirm deformation).

visually.

– Fan icing:

Confirm visually.

Faulty fan motor due to faulty door - Iced button (faulty) operation: - Confirm icing causes and repair.

switch operation. Press button to check - Replace door switch.

- Faulty button pressure and contact:

Press button to check operation.

- Door cannot press door switch - Door sag: fix door.

button: Check visually. - Door liner bent:replace door or

attach sheets.

TROUBLE DIAGNOSIS

Bad radiation conditions in - Check the clearance between the - Keep clearance between - The fan may be

compressor compartment. refrigerator and wall (50 mm in refrigerator and walls (minimum broken if cleaning

minimum). 50mm). performs while the

- Check dust on the grill in - Remove dust and contaminants refrigerator is on.

compressor compartment. from grill for easy heat radiation.

- Check dust on the coils condenser. - Remove the dust with vacuum

cleaner from the coils condenser

while the refrigerator is off.

2-4. Cooling

Problems Causes Checks Measures Remarks

TROUBLE DIAGNOSIS

-85-

High Refrigerant leak. Check sequence

temperature 1. Check the welded parts of the refrigerant.

in the freezer drier inlet and outlet and drier

compartment. auxiliary in the compressor

compartment (high pressure side).

2. Check the end of compressor

sealing pipe (low pressure side).

3. Check silver soldered parts.

(Cu + Fe / Fe + Fe).

4. Check bending area of wire

condenser pipe in compressor

compartment (cracks can

happen during bending).

5. Check other parts (compressor

compartment and evaporators in

freezer compartment).

Shortage of refrigerant. Check frost formation on the surface - Find out the leaking area, repair, Drier must be replaced.

of evaporator in the freezer evacuate, and recharge the

compartment. refrigerant.

- If the frost forms evenly on the - No leaking, remove the remaining

surface, it is OK. refrigerant, and recharge new

- If it does not, it is not good. refrigerant.

Weld the leaking part, recharge the Drier must be replaced.

-86-

TROUBLE DIAGNOSIS

Problems Causes Checks Measures Remarks

High Cycle pipe is clogged. Check sequence. - Heat up compressor discharging Direr must be replaced.

temperature in 1. Check temperature of condenser weld joints with touch, disconnect

the freezer manually. the pipes, and check the clogging.

compartment. If it is warm, it is OK. Remove the causes of clogging,

If it is not, compressor discharging weld, evacuate, and recharge

joints might be clogged. the refrigerant.

2. Manually check whether hot line - If it's warm, it's OK. If it's not,

pipe is warm. condenser discharging line weld

If it is warm, it's OK. joints might be clogged.

If it is not, condenser outlet weld Disconnect with torch, remove the

joints might be colgged. causes, evacuate, and recharge

seal refrigerant.

Leak at loop pipe weld joint Check sequence. Replace the compressor, weld, Drier must be replaced.

(discharge) in compressor. 1. Manually check whether evacuate, and recharge refrigerant.

condenser is warm, It is not warm

and the frost forms partly on the

evaporator in the freezer

compartment.

Faulty cooling fan in the compressor Check sequence. - Replace if motor does not operate.

compartment. 1. Check cooling fan operation. - If fan is disconnected, check fan

2. Check that cooling fan is damage and reassemble it.

disconnected from the motor. ■ Refer to fan motor disassembly

and assembly sequence.

-87-

2-5. Defrosting failure

Problems Causes Checks Measures Remarks

No defrosting. Heater does not generate heat as 1. Check the resistance of heater. Heating wire is short and wire is cut. Seal the lead wire with

the heating wire is cut or the circuit 0Ω: Short. ∞Ω: Cut. • Parts replacement: Refer to parts insulation tape and heat

is shorted. Tens to thousands Ω: OK. explanations. contraction tube if the cut

1) Heating wire is damaged when 2. Check the resistance between lead wire is accessible to

inserting into the evaporator. housing terminal and heater repair.

2) Lead wire of heater is cut. surface.

3) Heating wire at lead wire contacts 0Ω: Short. ∞Ω: Cut.

is cut. Tens to thousands Ω: Short.

Sucking duct and discharging hole 1. Confirm foreign materials. In case 1) Push out impurities by inserting

are clogged: of ice, insert the copper line copper wire.(Turn off more than

1. Impurities. through the hole to check. 3hours and pour in hot water if

2. Ice. 2. Put hot water into the drain frost is severe.)

(check drains outside). 2) Put in hot water to melt down frost.

3) Check the water outlet.

4) Push the heater plate to sucking

duct manually and assemble the

disconnected parts.

Gap between Sucking duct and 1. Confirm in the Sucking duct. 1) Turn off the power, confirm

Heater plate(Ice in the gap). impurities and ice in the gap, and

supply hot water until the ice in the

gap melts down.

2) Push the Heater plate to drain

bottom with hand and assemble

the disconnected parts.

Wrong heater rating (or wrong 1. Check heater label. Faults:replace.

assembly). 2. Confirm the capacity after - How to replace: Refer to main parts.

substituting the resistance value

into the formula.

2

V

P= ––

(V: Rated voltage of user country)

R

(R: Resistance of tester[Ω])

Compare P and lavel capacity.

Tolerance: ±7%

TROUBLE DIAGNOSIS

-88-

Problems Causes Checks Measures Remarks

No defrosting Melting fuse blows out. - Check melting fuse with tester. - Faullty parts: parts replacement.

1) Lead wire is cut. If 0Ω: OK. - Check wire color when maeasuring

2) Bad soldering. If ∞Ω: wire is cut. resistance with a tester.

Ice in the Sucking duct. 1. Check the inner duct with mirror. 1) Turn power off.

1) Icing by foreign materials in the 2) Raise the front side(door side),

duct. support the front side legs, and let

2) Icing by cool air inflow through the ice melt naturally. (If power is

the gap of heater plate. on, melt the frost by forced

3) Icing by the gap of heater plate. defrosting.)

2. Check by inserting soft copper 3) Reassemble the heater plate.

wire into the duct (soft and thin

copper not to impair heating wire).

Bad cool air inflow and discharge, 1. Turn on power, open or close the 1) Check the faulty connector of

and bad defrosting due to faulty door, check that motor fan housing and reassemble wrongly

contact and insertion (bad connector operates (If it operates, motor fan assembled parts.

insertion into housing of heater, is OK). 2) If the parts are very damaged,

melting, fuse and motor fan). 2. Disconnect parts in the refrigerator remove the parts and replace it

compartment, check the connection

around the housing visually,

defrost, and confirm heat generation

on the heater. Do not put hands on

the sheath heater.

3. Check the parts which have faults

described in 1, 2 (mechanical

model: disconnect thermostat

from the assembly).

with a new one.

TROUBLE DIAGNOSIS

-89-

2-6. Icing

Problems Causes Checks Measures Remarks

Icing in the 1) Bad circulation of cool air. - Check the food is stored properly - Be acquainted with how to use. - Check the defrost

refrigerator - Clogged intake port in the (check discharge and intake port - Sealing on connecting parts. related parts if problem

compartment. refrigerator compartment. are clogged). - Check the damper and replace is caused by faulty

- Damper icing. - Sealing is not good. - Check icing on the surface of it if it has defects. defrosting.

- Pipe icing. - Too much food is stored and clogs baffle and cool air path (pipe) after - Check defrost. (After forced

- Discharging the discharge port. dissembling the container box. defrosting, check ice in the

pipe icing. - Bad defrosting. - Check icing at intake ports of evaporator and pipes.)

freezer and refrigerator

compartment.

2) Faulty door or refrigerator - Check gasket attached conditions. - Correct the gasket attachment - Replacement should

compartment. - Check door assembly conditions. conditions and replace it. be done when it

- Faulty gasket. - Door assembly and replacement. cannot be repaired.

- Faulty assembly.

3) Overcooling in the refrigerator - Check refrigerator compartment - Replace faulty parts.

compartment. is overcooled (when button

- Faulty damper in the refrigerator pressed on "weak").

compartment. - Check parts are faulty.

- Faulty MICOM (faulty sensor)

TROUBLE DIAGNOSIS

4) Bad defrosting - Check frost on the evaporator - Check parts related to defrosting. - Moisture cannot frost

- Heater wire is cut. after dissembling shroud and fan - Check defrosting. (Check ice on the on the evaporator but

- Defective defrost sensor. grille. evaporator and pipe.) can be sucked into the

- Defrosing cycle. - Check ice on intake port of freezer refrigerator, being

and refrigerator compartment. condensed and iced,

interferes with cool air

circulation, and

suppresses sublimation.

5) Customers are not familiar with - Check food interferes with door - Be acquainted with how to use.

this machine. closing.

- Door opens. - Check ice on the ceilings.

- High temperature, high moisture,

and high load.

Problems Causes Checks Measures Remarks

Ice in the freezer 1) Bad cooling air circulation. - Check food storage conditions - Be acquainted with how to use. - Check the parts related

compartment. - Intake port is colgged in the freezer visually.(Check clogging at intake - Check defrost (Check ice on the to defrosting if the

- Surface of fan compartment. and discharging port of cooling air.) evaporator and pipes after forced problem is caused by

grille. - Discharging port is Clogged. - Check food occupation ratio in defrosting). the faulty defrosting.

- Wall of freezer - Too much food is stored. volume(Less than 75%).

compartment. - Bad defrosting. - Check frost on the evaporator after

- Cool air dissembling shroud and fan grille.

discharging port.

- Basket(rack) refrigerator compartment.

area.

- Food surface. 2) Bad freezer compartment door - Check gasket attachment - Correct the gasket attachement - Replace when it can not

- Icing in the - Faulty gasket conditions. conditions and replace it. be repaired.

shute. - Faulty assembly - Check door assembly conditions. - Door assembly and replacement.

- Check icing at intake port of

TROUBLE DIAGNOSIS

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3) Over freezing in the freezer - Refrigerator operates pull down. -Replace defective parts.

compartment. (Check if it is operated

- Faulty MICOM. intermittently)

- The Temperature of freezer

compartment is satisfactory, but

over freezing happens in the

refrigerator compartment even

though the notch is set at "weak".

4) Bad defrosting. - Check frost on the evaporator after - Check parts related to defrosting.

- Heater wire is cut. dissembling shroud and grille. - Check defrosting.(Check ice on the

- Faulty defrost sensor. - Check ice on the intake port in the evaporator and pipes after forced

- Defrosting cycle refrigerator compartment. defrosting.)

5) User is not familiar with how to - Check food holds door open. - Be acquainted with how to use.

use. - Check ice on the ice tray.

- Door opens.

- High moisture food(water) is stored.

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2-7. Sound

Problems Causes Checks Measures Remarks

"Whizz" sound 1. Loud sound of compressor 1.1 Check the level of the 1) Maintain horizontal level.

operation. refrigerator. 2) Replace rubber and seat if they

1.2 Check the rubber seat are sagged and aged.

conditions (sagging and aging). 3) Insert rubber where hand contact

reduces noise in the pipe.

2. Pipes resonat sound which is 2.1 Check the level of pipes 4) Avoid pipe interference.

connected to the compressor. connected to the compressor 5) Replace defective fan and fan

and their interference. motor.

2.2 Check rubber inserting 6) Adjust fan to be in the center of

conditions in pipes. bell mouth of the fan guide.

2.3 Touch pipes with hands or screw 7) Leve a clearance between

-driver (check the change of interfering parts and seal gaps in

sound). the structures.

8) Reassemble the parts which make

3. Fan operation sound in the freezer 3.1 Check fan insertion depth and sound.

compartment. blade damage. 9) Leave a clearance if evaporator

3.2 Check the interference with pipes and suction pipe touch

structures. freezer shroud.

3.3 Check fan motor.

3.4 Check fan motor rubber insertion

and aging conditions.

TROUBLE DIAGNOSIS

4. Fan operation sound in the 4.1 Same as fan confirmation in the

compressor compartment. refrigerator.

4.2 Check drip tray leg insertion.

4.3 Check the screw fastening

conditions at condenser and

drip tray.

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TROUBLE DIAGNOSIS

Problems Causes Checks Measures Remarks

Vibration sound. 1. Vibration of shelves and foods in 1-1. Remove and replace the 1) Reassemble the vibrating parts

("Cluck") the refrigerator. shelves in the refrigerator and insert foam or cushion where

2. Pipes interference and capillary 1-2. Check light food and container vibration is severe.

tube touching in the compressor. on the shelves. 2) Leave a clearance where parts

compartment. 2-1. Touch pipes in the compressore interfere with each other.

3. Compressor stopper vibration. compartment with hands. 3) Reduce vibration with rubber

4. Moving wheel vibration. 2-2 Check capillary tube touches and restrainer if it is severe.

5. Other structure and parts cover back. (especially, compressor and pipe).

vibration. 3-1 Check compressor stopper 4) Replace compressor stopper if it

vibration. vibtates severely.

4-1 Check vibration of front and rear

moving wheels.

5-1 Touch other structures and parts.

Irregular sound. 1. It is caused by heat expansion 1-1 Check time and place of sound 1)

("Click"). and contraction of evaporator, sources.

shelves, and pipes in the

refrigerator.

2)

Explain the principles of refrigeration

and that the temperature difference

between operation and defrosting

can make sounds.

If evaporator pipe contacts with other

structures, leave a clearance between

them (freezer shroud or inner case).

Problems Causes Checks Measures Remarks

TROUBLE DIAGNOSIS

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Sound "Burping" It happens when refrigerant expands

(almost the same at the end of capillary tube. initial installation. evaporator and capillary tube weld

as animals crying - Check the sound when the refrigerator joints and attach another restrainer.

sound). starts operation after forced defrosting. - If it is continuous and servere, insert

Water boiling or It happens when refrigerant passes - Check the sound when compressor is - Explain the principles of freezing cycles

flowing sound. orifice in accumulator internal pipes by turned on. and refrigerant flowing phenomenon by

the pressure difference between - Check the sound when compressor is internal pressure difference.

condenser and evaporator. turned off. - If sound is servere, wrap the

Sound of whistle When door closes, the internal pressure - Check the sound by opening and - Broaden the cap of discharge hose for

when door of the refrigerator decreases sharply closing the refrigerator or freezer doors. defrosting in the compressor

closes. below atomosphere and sucks air into compartment.

the refrigerator, making the whistle - Seal the gap with sealant between out

sound. and inner cases of hinge in door.

- Check the sound of refrigerant at the - Check the restrainer attached on the

- Check the restrainer attachment capillary tube again (depth:15±3mm)

conditions on the evaporator and - Fasten the capillary tube to suction

capillary tube weld joints. pipes or detach in the compressor

compartment.

- Explain the principles of freezing

cycles.

accumulator with foam and restrainer.

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2-8. Odor

Problems Causes Checks Measures Remarks

Food Odor. Food (garlic, kimchi, etc) - Check the food is not wrapped. - Dry deodorizer in the shiny and

- Check the shelves or inner windy place.

wall are stained with food juice. - Store the food in the closed

- Check the food in the vinyl wraps. container instead of vinyl wraps.

- Chedk food cleanliness. - Clean the refrigerator and set

button at "strong".

Plastic Odor. Odors of mixed food and plastic - Check wet food is wrapped with - Clean the refrigerator.

odors. plastic bowl and bag. - Persuade customers not to use

- It happens in the new refrigerator. plastic bag or wraps with wet food

or odorous foods.

Odor from the Odor from the old deodorizer. - Check the deodorizer odors. - Dry the deodorizer with dryer and *Deodorizer : option

deodorizer. then in the shiny and windy place.

- Remove and replace the

deodorants.

TROUBLE DIAGNOSIS

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2-9. Micom

Problems Symptom Causes Checks Measures Remarks

Bad PCB All display Bad connection Bad connector Visual check on connector Reconnect

electric power. LCD are off. between Main PCB connection from main connection. connector.

and display circuit. PCB to display PCB.

Defective PCB trans. PCB Trans winding is Check resistance of PCB Trans Replace PCB Trans Applicable to

cut. input and output terminals with or PCB. model without

PCB Trans temperature a tester. (If resistance is infinity, dispenser.

fuse is burnt out. trans winding is cut).

DefectivePCB electric Defective regulator IC Check voltage at input/output Replace regulator. Refer to electric

circuit parts. (7812, 7805). terminals. circuit in circuit

explanation.

PCB electric terminal Check fuse in PCB electric Replace PCB fuse.

fuse is burnt out. terminal with a tester.

STR Parts are Check if STR No. 2 and 3 pins Replace parts. Applicable to

damaged. are cut when power is off. model with

dispenser.

TROUBLE DIAGNOSIS

Abnormal Bad connection Lead Wire connecting Check Lead Wire terminals Reconnect Lead

display LCD between Main PCB main PCB and display connecting Main PCB and Wire and directly

operation and display circuit. PCB is cut or connector display PCB with a tester. connect defective

terminal connection is contact terminal to

bad. Lead Wire.

Defective LCD. Defective LCD. Check if all LCD are on when Replace display Refer to display

Main PCB Test switch is PCB. circuit in circuit

pressed (or when both freezer explanation.

key and power freezer key are

pressed at the same time for

more than one second.)

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Problems Symptom Causes Checks Measures Remarks

Bad cooling. Freezer Compressor does Compressor Lead Wire Check compressor Lead Wire Reconnect Lead

temperature is not start. is cut. with a tester. Wire.

high. Defective compressor Measure voltage at PCB CON2 Replace relay(RY1 Refer to load

driving relay. (3&9) after pressing main PCB and RY2) or PCB. driving circuit in

test switch once. It is OK if circuit

voltage is normal. explanation.

Defective freezer Defective Freezer Check resistance of freezer Replace freezer Refer to

sensor. sensor parts. sensor with a tester. sensor. resistance

characteristics

table of sensor in

circuit

Freezer sensor is Confirm the color of sensor in Repair main PCB explanation.

substituted for other circuits (main PCB sensor sensor housing

sensor. housing).

Defective freezer fan Fan motor lead wire Check fan motor lead wire Reconnect lead

motor. is cut. with a tester. wire.

• Defective door switch Measure the voltage between • Replace door Refer to load

(freezer, refrigerator, PCB power blue line and fan switch

home bar). motor after pressing test switch

• Defective fan motor. of Main PCB. If the voltage is home bar). explanation.

• Defective fan motor normal, it is OK. • Replace fan motor.

driving relay.

(freezer,

refrigerator

and circuit

driving circuits in

TROUBLE DIAGNOSIS

Faulty defrost. Refer to faulty defrost items in trouble diagnosis Refer to trouble

functions. diagnosis

function.

-97-

Problems Symptom Causes Checks Measures Remarks

Bad cooling Wrong Defective Step Motor Check Step Motor Check if Step Motor damper Reconnect lead

Refrigerator Damper. damper motor and motor and reed switch lead wire.

temperature. reed switch and lead wire are cut with a tester.

wire are cut. Check Refer to Step Motor damper Replace Step Motor

Step Motor damper in parts repair guide. damperor refrigerator

part.

Check Step Motor Refer to Step Motor damper Replace relay or Refer to single

damper Motor driving in parts repair guide. PCB. motor damper

relay in PCB. driving circuits

Foreign materials in Step

Motor damper baffles. baffle visually. materials.

Ice formation on Check if Step Motor damper Replace Step Motor

Step Motor damper Heater wire is cut with a

baffles. tester.

Defective refrigerator Defective refrigerator Check the resistance of Replace refrigerator Refer to sensor

sensor sensor parts. refrigerator sensor with a tester. sensor. resistance

Refrigerator sensor is Check the sensor color in the Repair main PCB

substituted for other circuit. (main PCB sensor sensor housing.

sensor. housing.)

Defective refrigerator Check if refrigerator sensor Fix again the

sensor assembly is not fixed at cover sensor but refrigerator sensor.

condition. inner case visually.

Check Step Motor damper Remove foreign

control box Assembly.

in circuit

explanation.

damper or refrigerator

control Box Assembly.

characteristic

table in circuit

explanation.

TROUBLE DIAGNOSIS

-98-

TROUBLE DIAGNOSIS

Problems Symptom Causes Checks Measures Remarks

Bad defrost. Defrost is not Defrost lead wire is cut. Check if defrost lead wire is cut with a Reconnect Lead

working. tester. Wire.

Defective defrost driving relay. Check the voltage of CON2 (1 and 7) Replace relay (RY 7 Refer to load

with a tester after pressing main and RY 3) or PCB. driving conditions

PCB test switch twice. check in circuit

If the voltage is normal then it is OK. explanation.

Defective defrost sensor parts. Check the resistance of defrost sensor Replace defrost Refer to sensor

with a tester. sensor. resistance

characteristic

table of circuit

explanation.

Defective Buzzer Defective connecting lead wire from Check lead wire related to door Repair lead wire.

buzzer continuously main PCB to door switch. switch with a tester.

rings or door Defective door switch parts. Refer to door switch in parts repair Replace door switch.

opening alarm guide.

does not work.

Defective Buzzer does Key input wire is cut or bad connector Check input wire with a tester. Reconnect lead Refer to display

display button not ring and terminal contact in main PCB and wire and replace or circuit in circuit

key does not display PCB connecting lead wire. directly connect bad explanation.

sense even contact terminal to

button is lead wire.

pressed.

Key is continuously depressed due to Disassemble frame display and confirm Adjust or replace

structural interference. visually. interfering

structures.

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TROUBLE DIAGNOSIS

Problems Symptom Causes Checks Measures Remarks

Defective Buzzer rings Trouble mode indication. Check trouble diagnosis function. Repair troubles Refer to mode

display button. but key does indication in

not sense even function

button is explanations.

pressed.

Door Buzzer Buzzer Defective connecting lead wire from Check lead wire associated with door Repair lead wire. Check model

continuously main PCB to door switch. switch. with dispenser.

rings or door Defective freezer compartment door Refer to door switch in parts repair Replace Freezer

opening alarm switch parts. guide. compartment door

does not work. switch.

Bad water/ice Ice and water Defective connecting lead wire from Check Lead Wire associated with lever Repair lead wire.

dispenser. are not Main PCB to lever switch. switch with a tester.

dispensed. Defective lever switch parts Refer to door switch in parts repair guide. Replace lever switch.

Defective photo coupler IC parts. Check voltage change at photo coupler Replace photo

output terminals with lever switch coupler IC or PCB.

pressed. It is OK if voltage change is

between 0V - 5V.

Defective relay associated with ice Check relay (RY4, RY5, RY12) Replace defective

dispense (geared motor, cube and with a tester. relay.

dispenser solenoid).

Defective parts associated with ice Check resistance of parts with a tester. Replace defective

dispense (geared motor, cube and parts.

dispenser solenoid).

Defective relay associated with water Check relay (RY7) with a tester Replace defective

dispense. relay.

Defective parts associated with water Check resistance of parts with a tester. Replace defective

dispenser. parts.

TROUBLE DIAGNOSIS

3. Cooling Cycle Heavy Repair

3-1. The Heavy Repair Standards for Refrigerator with R134a Refrigerant

NO. Items Unit Standards Purposes Remarks

1 Pipe and piping Min. Pipe:within 1 hour. To protect The opening time should be reduced to a

system opening time. Comp:within Moisture half of the standards during rain and

2 Welding. Nitrogen Weld under To protect - Refet to repair note in each part.

3N

2 sealed parts. Confirm N2 Confirm air leaking To protect - In case of evaporator parts, if it doesn't

4

Refrigeration

Cycle. time 40 minutes. moisture.

5 Refrigerant weighing. EA Use R134a Do not mix - Do not weight the refrigerant at too hot or

6 Drier replacement. -

7 Leak check. -Do not use soapy Detect -Check oil leak at refrigerant leak area.

Evacuation

Vacuum Torr Below 0.03(ref) Note:Only applicable to the model

degree equipped with reverse flow protect

Vacuum EA High and low Vaccum efficiency can be improved by

Vacuum EA Use R134a To protect The rubber pipes for R12 refrigerant shall

piping exclusive mixing of be melted when they are used for R134a

Pipe EA Use R134a To protect

coupler cxclusive. R12 Refri-

Outlet R134a exclusive.

(Socket)

Plug R134a exclusive

Pressure. Nitrogen oxide scale - R134a refrigerant is more susceptible to

leak. sounds when moisture noise when removing rubber cap blow

Min. More than To remove

10 minutes. Penetration. rainy seasons (the penetration of water

Drier:within into the pipe is dangerous).

20 minutes.

atmosphere formation. leaks than R12 and requires more care
(N

2 pressure: during welding.

0.1~0.2 kg/cm

removing rubber penetration. dry air or N
cap. use the parts.
Sound:usable
No sound:

Pressure sides are operating compressor during evacuation.
evacuated at the
same time for
models above 200

manifold. mineral and refrigerant(causes of leak).

exclusively. with R12 too cold an area.(25°C is adequate.)
Weighing refrigerant. - Use copper bombe
allowance:±5g Socket:2SV Plug: 2PV R134a
Note:Winter:-5g Note:Do not burn O-ring (rubber) during

Summer:+5g welding.

Use R134a exclusively

for R134a refrigerator

-

Use R12 exclusively

for R12 refrigerator

-

Replace drier whenever
repairing refrigerator
cycle piping.

water for check. refrigerant Use electronic leak detector if oil leak is
it may be sucked leak area. not found.
into the pipe by. -The electronic leak detector is very

2

) - Do not apply force to pipes before and

not usable

L

ester oils.

gerant mixing.

˝

˝

To remove

the moisture

from pipe.

after welding to protect pipe from
cracking.

2 gas for more than 1 min

plate.

sensitive to halogen gas in the air. It also
can detect R141b in urethane. Please
practice, therfore, many times before use.

NOTE) Please contact Songso company on [phone] if you have inquiry on heavy repair special facility.

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