LG LFC20760 Series User manual

CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
REFRIGERATOR
SERVICE MANUAL
MODELS:
LFC20760**
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CONTENTS
-2-
Please read the following instructions before servicing your
refrigerator.
1.Check the refrigerator for current leakage.
2.To prevent electric shock,unplug before servicing.
3.Always check line voltage and amperage.
4.Use standard electrical components.
5.Don't touch metal products in the freezer with wet
Hands.This may cause frost bite.
6.Prevent water from spiling on to electric elements or the
Machine parts.
7.Before tilting the refrigerator,remove all materials from
On or in the refrigerator.
8.When servicing the evaporator,wear gloves to prevent
Injuries from the sharp evaporator fins.
9.Service on the refrigerator should be performed by a
Qualified technician.Sealed system repair must be
Performed by a CFC certified technician.
SAFETY PRECAUTIONS
SAFETY PRECAUTIONS .....................................................................................................
1. SPECIFICATIONS ............................................................................................................
2. PARTS IDENTIFICATION .................................................................................................
3. DISASSEMBLY .................................................................................................................
3.1 Door .............................................................................................................................
3.2 Door alignment .............................................................................................................
3.3 Fan and fan motor .......................................................................................................
3.4 Defrost control assembly .............................................................................................
3.5 Lamp ............................................................................................................................
3.6 Control box-refrigerator ................................................................................................
3.7 Multi duct ......................................................................................................................
4. ADJUSTMENT ..................................................................................................................
4.1 Compressor ..................................................................................................................
4.2 PTC-Starter ..................................................................................................................
4.3 OLP (Overload Protector) ............................................................................................
4.4 To remove the cover PTC ............................................................................................
5. CIRCUIT DIAGRAM .........................................................................................................
6. TROUBLESHOOTING ......................................................................................................
6.1 Compressor and electrical components ......................................................................
6.2 PTC and OLP ..............................................................................................................
6.3 Other electrical components .......................................................................................
6.4 Service diagnosis chart ...............................................................................................
6.5 Refrigeration cycle ......................................................................................................
7. OPERATION PRINCIPLE AND REPAIR METHOD OF ICEMAKER ...............................
7.1 Operation principle ......................................................................................................
7.2 Ice maker functions .....................................................................................................
7.3 Defect diagnosis function ............................................................................................
8. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM .................................................
8.1 Function .....................................................................................................................
8.2 PCB function ...............................................................................................................
8.3 Resistance specification of sensor ..............................................................................
8.4 Troubleshooting ...........................................................................................................
8.5 Main PWB assembly and parts list ..............................................................................
8.6 PWB diagram ..............................................................................................................
9. EXPLODED VIEW ...........................................................................................................
2
3
4
5
5
6
7
7
7
7
7
8
8
8
9
9
10
11
11
12
13
14
15
17
17
18
19
20
20
24
31
32
34
37
39
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1. SPECIFICATIONS
- 3-
HANDLE TYPE Vista-Handle
REVERSIBLE DOOR NO
DOOR FINISH STAINLESS/ VCM/ PCM
BASKET DOOR NO
LAMP YES (1) 40W/blue
TRAY MEAT YES
SHELF 4Fix
MAGIC CRISPER NO
LAMP YES (2) 40W/blue
GUIDE BOTTLE YES (2)
DOOR COOOLING NO
TRAY VEGETABLE YES (NORMAL)
270.28
GENERAL FEATURES
CAPACITY CUFT;(F/R/T)
R134a 120±3
ICE TRAY
SHELF
SPECIFICATIONS
DIMENSIONS in;(W*H*D)
FREEZERREFRIGERATOR
WEIGHT lb;
Ice bank (1ea)
BASKET DOOR 3LEFT + 3RIGHT
REFRIGERANT/gr
MODELS
NO
LFC20760ST
LFC20760SW
LFC20760SB
6.39/13.21/19.6
29.88*68.43*32.17
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DIMENSIONS
Depth w/ Handles
Depth w/o Handles
Depth w/o Door
Depth (Total with Door Open)
Height to Top of Case
Height to Top of Door Hinge
Width
Width (door open 90 deg. w/o handle)
Width (door open 90 deg. w/ handle)
A
B
C
D
E
F
G
H
I
Description
LFC20760**
34 ½
32
28 ¼
44
29 ¾
32 ½
37 ½
67 716
68 58
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2. PARTS IDENTIFICATION
Use this section to become more familiar with the parts and features.
NOTE: This guide covers several different models. The refrigerator you have purchased may have some
or all of the items listed below. The locations of the features shown below may not match your model.
*on some models
A
B
C
G
H
I
J
E
F
K
D
L
M
N
O
P
A
L
Digital Sensor Control Filter (Inside)*
Durabase
Divider
Egg Box *
Refrigerator Door Rack
Freezer Light
Pull out Drawer
B
C
D
F
E
G
H
I
J
K
M
N
O
P
Ice Tray *
Optibin Crisper
Keeps fruits and vegetable fresh and crisper
Chef Fresh / Snack Pan
Can Dispenser *
Shelves
Refrigerator Light
Customcube Icemaker *
Dairy Bin
*
- 4 -
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3-1 DOOR 2. Remove gasket bracket clips
There are two clips on each door. Start bracket removal
near one of the middle clips.
1) Pull gasket back to expose gasket bracket clip and
door frame.
2) Insert a flat tip screwdriver into seam between gasket
bracket and door frame and pry back until clips snaps
out.
3) Continue prying back along seam until all clips snap
out.
3. Remove gasket
Pull gasket free from gasket channel on the three
remaining sides of door.
Door Gasket Replacement
1. Insert gasket bracket clips
1) Insert gasket bracket edge beneath door frame edge.
2) Turn upper gasket bracket spring so that both spring
ends are in the door channel.
3) Push in clip until you hear it snap securely into place.
4) Push in remaining two clips until you hear each snap
securely into place.
Note: Make sure that no part of gasket bracket edge
protrudes from beneath door frame edge.
3. DISASSEMBLY
- 5-
Frame Cover
Handle
Gasket
Door Bracket Clip
Frame
Flat Tip
Screwdriver
Gasket
Bracket
Figure 3
Figure 1
Figure 2
Figure 4
Gasket
Bracket Clip
Spring
Door
Frame Correct Incorrect
Figure 5
Left Door
Loosen the cover screw (1).
Disconnect door switch wire (2).
Loosen hinge bolts (3).
Lift off the top hinge (4).
Place the door on a non-scratching surface with
the inside up.
the inside up.
Door Gasket Removal
1. Remove door frame cover
Starting at top of cover and working down, snap cover
out and away from door.
Right Door
Loosen the cover screw (1).
Disconnect door switch wire (2).
Loosen hinge bolts (3).
Lift off the top hinge (4).
Place the door on a non-scratching surface with
Loosen ground screw (6).
Disconnect wire harness (5).
Left Right
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2. Insert gasket into channel
1) Snap gasket assembly into the door bracket.
<Inserting the Gasket Assembly into the Bracket Door>
2) Press gasket into channels on the three remaining
sides of door.
3. Replace door frame cover
Starting at top of cover and working down, snap cover
back into door.
3-2 DOOR ALIGNMENT
If the space between your doors is uneven, follow the
instructions below to align the doors:
1. With one hand, lift up the door you want to raise at
middle hinge.
2. With other hand, use pliers to insert snap ring as shown.
3. Insert additional snap rings until the doors are aligned.
(Three snap rings are provided with unit.)
- 6 -
Figure 6
Correct
Incorrect
Figure 7
Figure 8
Figure 9
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3-3 FAN AND FAN MOTOR
1. Remove the freezer shelf. (If your refrigerator has an
icemaker, remove the icemaker first)
2. Remove the plastic guide for slides on left side by
unscrewing phillips head screws.
3. Remove the grille by removing one screw and pulling the
grille forward.
4. Remove the Fan Motor assembly by loosening 2 screws
and disassembling the shroud.
5. Pull out the fan and separate the Fan Motor and Bracket.
3-4 DEFROST CONTROL ASSEMBLY
Defrost Control assembly consists of Defrost Sensor and
FUSE–M.
The Defrost Sensor works to defrost automatically. It is
attached to the metal side of the Evaporator and senses its
temperature. At 72°C, it turns the Defrost Heater off.
Fuse-M is a safety device for preventing over-heating of
the Heater when defrosting.
1. Pull out the grille assembly. (Figure 12)
2. Separate the connector with the Defrost Control
assembly and replace the Defrost Control assembly
after cutting the Tie Wrap. (Figure 13)
3-5 LAMP
3-5-1 To change the refrigerator light (figure 14)
(Max. 40 W2EA).
3-5-2 Freezer Compartment Lamp (figure 15)
1. Unplug refrigerator or disconnect power.
2. Reach behind light shield to remove bulb.
3. Replace bulb with a 40-watt appliance bulb.
4. Plug in refrigerator or reconnect power.
3-6 CONTROL BOX-REFRIGERATOR
1. First, remove all shelves in the refrigerator, than remove
the Refrigerator control Box by loosening 2 screws.
2. Remove the Refrigerator Control Box by pulling it
downward.
3. Disconnect the lead wire on the right position and
separate the lamp sockets.
3-7 MULTI DUCT
1. Remove the upper and
lower Caps by using a flat
screwdriver, and remove 2
screws. (Figure 17)
2. Disconnect the lead wire
on the bottom position.
-7--
GRILLE ASSEMBLY
Figure 12
DEFROST-CONTROL
ASSEMBLY
Figure 13
Figure 14
Figure 15
CONTROL BOX
COVER LAMP
Figure 16
Figure 17
GRILLE
FAN MOTOR
FAN
BRACKET
MOTOR
Figure 11
1. Unplug the power cord from the outlet.
2. Remove refrigerator shelves.
3.
4. Turn the bulb counterclockwise.
5. To assemble, first insert the hooks at the back and
Release the hooks on the front of the light shield
with the help of a flat screwdriver and pull the
shield down to remove it.
then push up the light shield upwards.
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4-1 COMPRESSOR
4-1-1 Role
The compressor intakes low temperature and low pressure
gas from the evaporator of the refrigerator and compresses
this gas to high-temperature and high-pressure gas. It then
delivers the gas to the condenser.
4-1-2 Composition
The compressor includes overload protection. The PTC
starter and OLP (overload protector) are attached to the
outside of the compressor. Since the compressor is
manufactured to tolerances of 1 micron and is hermetically
sealed in a dust and moisture-free environment, use
extreme caution when repairing it.
4-1-3 Note for Usage
(1) Be careful not to allow over-voltage and over-current.
(2) If compressor is dropped or handled carelessly, poor
operation and noise may result.
(3) Use proper electric components appropriate to the
Particular Compressor in your product.
(4) Keep Compressor dry.
If the Compressor gets wet (in the rain or a damp
environment) and rust forms in the pin of the Hermetic
Terminal, poor operation and contact may result.
(5) When replacing the Compressor, be careful that dust,
humidity, and soldering flux don ’t contaminate the inside
of the compressor. Contamination in the cylinder may
cause noise, improper operation or even cause it to
lock up.
4-2 PTC-STARTER
4-2-1 Composition of PTC-Starter
(1) PTC (Positive Temperature Coefficient) is a no-contact
semiconductor starting device which uses ceramic
material consisting of BaTiO3.
(2) The higher the temperature is, the higher the resistance
value. These features are used as a starting device for
the Motor.
4-2-2 Role of PTC-Starter
(1) The PTC is attached to the Sealed Compressor and is
used for starting the Motor.
(2) The compressor is a single-phase induction motor.
Durign the starting operation, the PTC allows current
flow to both the start winding and main winding.
4-2-3 PTC-Applied Circuit Diagram
••Starting Method for the Motor
4-2-4 Motor Restarting and PTC Cooling
(1) It requires approximately 5 minutes for the pressure to
equalize before the compressor can restart.
(2) The PTC device generates heat during operation.
Therefore, it must be allowed to cool before the
compressor can restart.
4-2-5 Relation of PTC-Starter and OLP
(1) If the compressor attempts to restart before the PTC
device is cooled, the PTC device will allow current to
flow only to the main winding.
(2) The OLP will open because of the over current
condition. This same process will continue (3 to 5
times) when the compressor attempts to restart until
the PTC device has cooled. The correct OLP must be
properly attached to prevent damage to the
compressor.
Parts may appear physically identical but could have
different electrical ratings. Replace parts by part
number and model number. Using an incorrect part
could result in damage to the product, fire, injury, or
possibly death.
4-2-6 Note for Using the PTC-Starter
(1) Be careful not to allow over-voltage and over-current.
(2) Do not drop or handle carelessly.
(3) Keep away from any liquid.
If liquid such as oil or water enters the PTC,
PTC materials may fail due to breakdown of their
insulating capabilities.
(4) If the exterior of the PTC is damaged, the resistance
value may be altered. This can cause damage to the
compressor and result in a no-start or hard-to-start
condition.
(5) Always use the PTC designed for the compressor and
make sure it is properly attached to the compressor.
Parts may appear physically identical but could have
different electrical ratings. Replace parts by part
number and model number. Using an incorrect part
could result in damage to the product, fire, injury, or
possibly death.
4. ADJUSTMENT
-8--
PTC STARTER SEALED
TERMINAL
COMPRESSOR
MOTOR
C
M
SM
36
5
2
S
PTC
N
L1
OVERLOAD PROTECTOR
Resistance Starter Capacitor Running
Figure 17
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4-3 OLP (OVERLOAD PROTECTOR)
4-3-1 Definition of OLP
(1) OLP (OVERLOAD PROTECTOR) is attached to the
Compressor and protects the Motor by opening the
circuit to the Motor if the temperature rises and
activating the bimetal spring in the OLP.
(2) When high current flows to the Compressor motor, the
Bimetal works by heating the heater inside the OLP,
and the OLP protects the Motor by cutting off the
current flowing to the Compressor Motor.
4-3-2 Role of the OLP
(1) The OLP is attached to the Sealed Compressor used
for the Refrigerator. It prevents the Motor Coil from
being started in the Compressor.
(2) For normal operation of the OLP, do not turn the Adjust
Screw of the OLP in any way.
4-4 TO REMOVE THE COVER PTC
1) Remove the Cover Back M/C.
(2) Disconnect two housing upper side of comp connected
in.
(3) Loosen two screws on comp base.
(4) Use a L-shaped flap tool to pry off the cover.
(5) Assembly in reverse order of disassembly.
- 9 -
Part
Customer part
number
Lot code/
date code
330 FBYY -S1 BOX98
12345678
Physical
termination
part number
Electrical
characteristics
part number
No. Name
Base, phenolic
(UL 94 V-0 rated)
Movable arm support, plated steel
Stationary contact support,
plated steel
Heater support, plated steel
Heater, resistance alloy
Disc, thermostatic alloy
Movable arm, spring temper
copper alloy
Contact, movable, silver on copper
Contact, stationary, silver on copper
Slug, plated steel
Cover, polyester
(UL 94 V-0 rated)
Pin connector, plated copper alloy
(To engage 2.33/2.66 mm dia. pin)
(OVERLOAD PROTECTOR cross section)
Figure 18
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5. CIRCUIT DIAGRAM
- 10 -
4
CON101
BK
MOTOR
19
C-FAN
BL PK
STEPPING
6
BO
3
SB
5
RD
28
WH
F-FAN
PR
7
YL
PWB(PCB) ASSEMBLY,DISPLAY
1
BL
L1
BK
CON6
10
5
11
BL
FUSE1
RD
L
4
7
68
CON2
RD
CON1
CORD
GN/YL
BK
7
5
(GN)
POWER
YL
BN
PR
YL
8
BN
CON5
PK WH
BO
96
BK
31 2
66
5
BN
YL
2
4
10
1
BL
11
BN
24
RD
5
9
BL
SB
N
7
SB
SUPPLY
3
SB
3
BL
SB
10
BN BL
6
CON4
BK YL
21
WH
89
PR
743
RD
CON7
GY
CON8
5
BO
1
1
R-DOOR
DEF-SENSOR
BPERCEPTION S/W
GY
F-DOOR
4
PERCEPTION S/W
PK
GY
4
A
RT-SENSOR
2
D
BO
3
BN
C
3
2PK
BN
BN
1
BN
SBSB
BL
2
13
CON3
32
SB
BL
7
BL
F-SENSOR
6
BL
WH
R-SENSOR
8
WH
5
CON4
GN/YL
CON2
M
HEATER,
BK
WH
ICE SENSOR
1
WH
ICE MAKER
ICE MAKER PART
2
2
WH
WH
MOTOR
1
SHEATH
CON1
1
CON5
CON3
(GN)
WH
1
(98 C)
FUSE-M
I/MAKER
W/VALVE
BK
V
S/W
Cr
RD
PK
22
CAPACITOR PARTCAPACITOR PART
CON6
1
BL
2
1
RD
BK
55
66
44
33
PTC STARTER
Cs
BL
COMP' ACCESSORIES
POWER
PK:PINKYL:YELLOW
BK:BLACK
GN:GREEN
BN:BROWN
PWB (PCB) ASSEMBLY, ICE MAKER
WH:WHITE
BL
FUSE-M
BL
BA
HEATER,SHEATH
BO
RD
(72 C)
nc
BK
OLP
/YL
SGN
PART
PART
SGN
/YL
M
COMP' EARTHCOMP' EARTH
(GN)(GN) BL
PR
F-LAMP
nc
R-LAMPS
DC
BL
nc
PR:PURPLE
BO:BRIGHT ORANGE
BL:BLUE
RD:RED
nc
SB:SKY BLUE
GY:GREY
SB
com
FRENCH DOOR HEATER
4
com
DOOR S/W-R DOOR S/W-F
com
PWB(PCB) ASSEMBLY, MAIN
com
4
EG COMP'
46
3
2
5
MC,MQ COMP'
* P.T.C START OPTION
3256
COMP' ACCESSORIES ON CIRCUIT DIAGRAM ARE SUBJECT
*PLUG TYPE, ICE MAKER PART, CAPACITOR PART,
P.T.C START OPTION, DOOR HEATER, RT-SENSOR,
DOOR S/W-R QTY. (1 OR 2), COMP' EARTH PART AND
TO CHANGE IN DIFFERENT LOCALITIES AND MODEL TYPE.
N
BL
Cr
PTC
COMBO KIT(PTC+OLP)
BK
L
OLP
* ALTERNATIVE COMP' ACCESSORIES
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6. TROUBLESHOOTING
- 11-
6-1 COMPRESSOR AND ELECTRIC COMPONENTS
1
2
3
4
5
2
5
5
3
5
1
43
YES
NO
YES
The range of resistance is between 1~50? (ok)
Open or short
YES YES
NO
NO
Power Source.
No Voltage.
(Rated Voltage
±10%)?
Replace OLP.
Reconnect.
Reference Page12.
Reference Page12.
Did
compressor
start?
Compressor
is OK
Replace the
compressor
Check connection
condition.
OLP disconnected?
Advise customer that
power supply needs to be
checked by an electrician.
Replace
Compressor.
Supply
voltage rating
with ±10%.
Applied voltage isn't
in acceptable range.
(115V ±10%)
Remove PTC-Starter
from Compressor and
measure voltage
between Terminal C of
Compressor and
Terminal 5 or 6 of PTC.
Check resistance
between M-C, S-C and
M-S in Motor
Compressor.
Check resistance of
two terminals in
PTC-Starter.
Check resistance of two
terminals in OLP.
Check the power supply
under load.
(Compressor attempting
to re-start after being off
for 5 minutes).
Check
resistance of
Motor
Compressor.
Check
resistance of
PTC-Starter.
Check OLP.
Check
starting state.
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- 12-
6-2 PTC AND OLP
65
Shows continuity
Open
Normal operation of
Compressor is
impossible or poor.
Separate PTC-Starter
from Compressor and
measure resistance
between No. 5 and 6
of PTC-Starter with a
Tester.
(Figure 19)
Separate OLP from
Compressor and check
resistance value
between two terminals
of OLP with a Tester.
(Figure 20)
Observation value is
115V/60Hz : 6.8? ±30%
The resistance value
is 0? (short) or
෱(open).
Check another
electric component.
Replace OLP.
Replace PTC-
Starter.
Figure 19 Figure 20
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- 13-
•Not cooling at all
ವPoor cooling performance
Compressor
doesn't run.
Compressor runs
poorly.
Check starting
voltage.
Check for open short or
incorrect resistance readings
in the following components
a. Starting devices
b. OLP
c. Compressor coil
d.Wiring harness
Low voltage.
Short, open, or broken.
Poor contact
or shorted.
Coil open or shorted.
Poor contact
or shorted.
Poor or broken or
open contact.
Shorted.
Lack of capacity.
Replace
indicated component.
Advise customer that
the Power supply
needs to be checked
by an electrician.
Replace
indicated component.
Cause
Check voltage at
starting devices.
Check current flowing
in sub-coil of
Compressor.
Check rating of OLP.
Fan motor
doesn't run.
Heavy frost buildup on
EVAPORATOR.
Wire is open or
shorted.
Coil is shorted
or open.
Open.
Open. Replace
Defrost Heater.
Replace
indicated component.
Replace
indicated component.
Check wiring circuit.
Check Fan Motor.
Check current flow in
the following
components:
Sensor
Fuse-M
Check current flow in
the Defrost Heater.
6-3 OTHER ELECTRICAL COMPONENTS
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6-4 SERVICE DIAGNOSIS CHART
- 14-
COMPLAINT POINTS TO BE CHECKED REMEDY
•Other possible problems:
Check if frost forms in
the freezer.
Check Components
of the defrosting
circuit.
Check the
refrigeration system.
Check the
Thermistor.
Not
defrosting
The system
is faulty. Perform sealed
system repair.
Replace the
Thermistor.
The operation of
the Thermistor is
incorrect.
No Cooling.
Cools poorly.
Food in the
Refrigerator
is frozen.
Condensation or ice
forms inside
the unit.
Condensation forms
in the Exterior Case.
There is abnormal
noise.
Door does not
close well.
Ice and foods
smell unpleasant.
•Is the power cord unplugged from the outlet?
Check if the power switch is set to OFF.
Check if the fuse of the power switch is shorted.
Measure the voltage of the power outlet.
Check if the unit is placed too close to the wall.
Check if the unit is placed too close to the stove,
gas cooker, or in direct sunlight.
Is the ambient temperature too high or
the room door closed?
Check if food put in the refrigerator is hot.
Did you open the door of the unit too often
or check if the door is sealed properly?
Check if the Control is set to Warm position.
Is food placed in the cooling air outlet?
Check if the control is set to colder position.
Is the ambient temperature below 5ºC?
Is liquid food sealed?
Check if food put in the refrigerator is hot.
Did you open the door of the unit too
often or check if the door is sealed properly?
Check if the ambient temperature and humidity
of the surrounding air are high.
Is there a gap in the door gasket?
Is the unit positioned in a firm and even place?
Are any unnecessary objects placed
in the back side of the unit?
Check if the Drip Tray is not firmly fixed.
Check if the cover of the compressor enclosure
in the lower front side is taken out.
Check if the door gasket is dirty with
an item like juice.
Is the refrigerator level?
Is there too much food in the refrigerator?
Check if the inside of the unit is dirty.
Are foods with a strong odor unwrapped?
The unit smells of plastic.
Plug into the outlet.
Set the switch to ON.
Replace the fuse.
If the voltage is low, correct the wiring.
Place the unit about 4 inches (10 cm) from the wall.
Place the unit away from these heat sources.
Lower the ambient temperature.
Put in foods after they have cooled down.
Don't open the door too often and close
it firmly.
Set the control to Recommended position.
Place foods in the high-temperature section.
(front part)
Set the control to Recommended position.
Set the control to Warm position.
Seal liquid foods with wrap.
Put in foods after they have cooled down.
Don't open the door too often and close
it firmly.
Wipe moisture with a dry cloth. It will disappear
in low temperature and humidity.
Fill up the gap.
Adjust the Leveling Screw, and position the
refrigerator in a firm place.
Remove the objects.
Fix the Drip Tray firmly in the original position.
Place the cover in its original position.
Clean the door gasket.
Position in a firm place and level the
Leveling Screw.
Make sure food stored in shelves does not prevent
the door from closing.
Clean the inside of the unit.
Wrap foods that have a strong odor.
New products smell of plastic, but this
will go away after 1-2 weeks.
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
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6-5 REFRIGERATION CYCLE
- 15-
ವTroubleshooting Chart
PARTIAL Freezer Low flowing sound of A little higher • Refrigerant level is low due
LEAKAGE compartment and Refrigerant is heard and than ambient ¥to a leak.
Refrigerator don't frost forms in inlet only. temperature. • Normal cooling is possible by
cool normally. ¥restoring the normal amount of
¥ refrigerant and repairing the leak.
COMPLETE Freezer Flowing sound of refrigerant Equal to ambient
•
No discharging of Refrigerant.
LEAKAGE compartment and is not heard and frost isn't temperature. • Normal cooling is possible by
Refrigerator don't formed. ¥restoring the normal amount of
cool normally. ¥
refrigerant and repairing the leak.
PARTIAL Freezer Flowing sound of refrigerant A little higher • Normal discharging of the
CLOG compartment and is heard and frost forms than ambient ¥refrigerant.
Refrigerator don't in inlet only. temperature. • The capillary tube is faulty.
cool normally.
WHOLE Freezer Flowing sound of refrigerant Equal to ambient • Normal discharging of the
CLOG
compartment and is not heard and frost isn't temperature. ¥Refrigerant.
Refrigerator don't cool. formed.
MOISTURE Cooling operation Flowing sound of refrigerant Lower than • Cooling operation restarts
CLOG stops periodically. is not heard and frost melts. ambient ¥when heating the inlet of the
temperature. ¥capillary tube.
COMP- Freezer and Low flowing sound of A little higher • Low pressure at high side
RESSION Refrigerator refrigerant is heard and than ambient ¥of compressor due to low
don't cool. frost forms in inlet only. temperature. ¥refrigerant level.
NO COMP- No compressing Flowing sound of refrigerant Equal to ambient • No pressure in the high
RESSION operation. is not heard and there is temperature. ¥pressure part of the
no frost. ¥compressor.
CAUSE
TEMPERATURE
OF THE
COMPRESSOR
REMARKS
STATE OF
THE UNIT
STATE OF THE
EVAPORATOR
LEAKAGE
CLOGGEDBYDUST
DEFECTIVE
COMPRESSION
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6-5-1 SEALED SYSTEM DIAGNOSIS
- 16-
“ Not Cooling” Complaint
All components operating, No airflow problems, Not frosted up as a defrost problem
problem has been isolated to sealed system area
Frost
Pattern?
Equalization
Test
Partial
Very Fast
Inefficient
Compressor
Partial
Restriction
Complete
Restriction
Equalization
Test
Condenser
Temperature
None
Very Fast
Very SlowVery Slow
Hotter than Normal
Air/Low Side
Leak Loss of Change
Compressor Not
Pumping
Cap Tube
Sound
Room Temperature
Trace of Oil
Undercharge
Leak
Yes
No
Faint
Fast
None to Weak
(The equalization test is trying to restart a compressor using a start kit after it has been operating.)
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7. OPERATION PRINCIPLE AND REPAIR METHOD OF ICEMAKER
- 17 -
7-1 OPERATION PRINCIPLE
7-1-1 Operation Principle of Icemaker
1. Turning the Icemaker stop switch off (O) stops the icemaking function.
2. Setting the Icemaker switch to OFF and then turning it back on will reset the icemaker control.
Start Position
Icemaking
Mode
Harvest
Mode
Park Position
Fill
•
Test Mode
Waits until water becomes cold after starting the
Icemaking operation.
• Runs MOTOR to drop ice from the tray into the ICE BIN.
• Performs Icemaking Mode after supplying water by operating
the SOLENOID in ICE VALVE.
• To operate LINE and SERVICE, press and hold the Cube Size button
for 3 seconds. The icemaking will run through 3 stages:
Harvest Fill Icemaking.
• With the detect lever, checks if the ICE BIN is full.
Power (On/Off) Switch
Power On
•Adjusts Ejector to Start Position with power on.
Cube Size button
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- 18 -
7-2 ICE MAKER FUNCTIONS
7-2-1 Ice Making Mode
1. Icemaking refers to the freezing of supplied water in the ice trays. Complete freezing is assured by measuring the
temperature of the Tray with icemaking SENSOR.
2. Icemaking starts after completion of the water fill operation.
3. The icemaking function is completed when the sensor reaches -7°C, 60 to 240 minutes after starting.
NOTE : After icemaker power is ON, the icemaker heater will be on for test for 9 sec.
7-2-2 Harvest Mode
1. Harvest (Ice removing) refers to the operation of dropping ices into the ice bin from the tray when icemaking has
completed.
2. Harvest mode:
(1) The Heater is ON for 30 seconds, then the motor starts.
(2) Harvest mode is completed if it reaches start position again while Heater & Motor are on at the same time.
A. ice bin is full : The EJECTOR stops (heater off).
B. ice bin is not full : The EJECTOR rotates twice to open for ice.
NOTE : If the EJECTOR does not rotate once within 5 minutes in status (2), separate heater control mode starts
operating to prevent the EJECTOR from being constrained. (It is recommended that the user open for ice to
return to normal mode.)
7-2-3 Fill/Park Position
1. Once a normal harvest mode has been completed, the water solenoid will be activated.
2. The amount of water is adjusted by pressing the fill key repeatedly. This changes the time allowed for fill as illustrated in
the table below.
Water supply amount table
STAGE TIME TO SUPPLY INDICATIONS REMARKS
1
2
3
6 sec.
7 sec.
8 sec.
The water amount will vary depending
on the water control switch setting, as
well as the water pressure of the
connected water line.
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- 19 -
7-2-5 Function TEST
1. This is a compulsory operation for test, service, cleaning, etc. It is operated by pressing and holding the Cube Size button
2. The test works only in the Icemaking Mode. It cannot be entered from the Harvest or Fill mode. (If there is an ERROR, it
can only be checked in the TEST mode.)
3. Caution! If the test is performed before water in the icemaker is frozen, the ejector will pass through the water. When the fill
mode begins (Stage 4), unless the water supply has been shut off, added water will overflow into the ice bin. If the control
Doesn’t operate normally in the TEST mode, check and repair as needed.
4. After water is supplied, the normal CYCLE is followed: icemaking Harvest Fill Park Position.
5. Five seconds after Stage 5 is completed, the icemaker returns to MICOM control. The time needed to supply water
resets to the pre- test setting.
Diagnosis TABLE
7-3 DEFECT DIAGNOSIS FUNCTION
7-3-1 ERROR CODES shown on Ice Maker water supply control panel
ERROR indicators in table can be checked only in TEST mode.
STAGE ITEMS INDICATOR REMARKS
1
2
3
4
5
6
HEATER
MOTOR
HALL IC
(TRAY)
SOLENOID VALVE
HALL IC
(LEVER)
Reset
Five seconds after heater starts, heater will
go off if temperature recorded by sensor is
10°C (50°F)or lever is in up position.
Five seconds after heater starts, you can
confirm that motor is moving.
You can confirm Hall IC detection of position.
Two seconds after detection of initial
position, you can confirm that valve is on.
You can check when the Hall IC is sensing a full
ice condition. (If there is a water fill error, the
fifth LED is not on.)
Five seconds after fifth stage is completed,
the icemaker resets to initial status.
Return to Status prior to
TEST MODE
NO DIVISION INDICATOR REMARKS
1
2
3
Normal
Icemaking
Sensor
malfunction
Icemaker Kit
malfunction
None Display switch
operates properly
Make sure that the wire
on each sensor is
connected.
Check
HALL IC/MOTOR/
HEATER/RELAY
*
*
PROBLEM
Note fill times
(see previous page)
Open or shorted wire or sensor
Ejector blades have not reached
the park position after 18
minutes from start of harvest
mode
for 3 seconds.
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