REFRIGERATOR SERVICE MANUAL

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REFRIGERATOR SERVICE MANUAL | Manualzz
REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
MODEL : LMX28988**
LMX25988**
COLOR : STAINLESS(ST)
SMOOTH BLACK(SB)
SUPER WHITE(SW)
CONTENTS
SAFETY PRECAUTIONS ....................................................................................................................................................... 2
1. SPECIFICATIONS .......................................................................................................................................................... 3-4
2. PARTS IDENTIFICATION ................................................................................................................................................. 5
3. DISASSEMBLY ............................................................................................................................................................ 6-16
REMOVING AND REPLACING REFRIGERATOR DOORS ............................................................................................. 6
DOOR ................................................................................................................................................................................ 7
DOOR ALIGNMENT .......................................................................................................................................................... 8
FAN AND FAN MOTOR(EVAPORATOR) ......................................................................................................................... 8
DEFROST CONTROL ASSEMBLY ................................................................................................................................... 8
LAMP ................................................................................................................................................................................. 9
MULTI DUCT ..................................................................................................................................................................... 9
MAIN PWB ....................................................................................................................................................................... 10
DISPENSER .................................................................................................................................................................... 10
DISPLAY PCB ................................................................................................................................................................. 10
ICE BUTTON ASSEMBLY ............................................................................................................................................... 10
WATER BUTTON ASSMEBLY ........................................................................................................................................ 11
ICE CORNER DOOR REPLACEMENT ........................................................................................................................... 11
ICEMAKER REPLACEMENT ..................................................................................................................................... 11-12
SUB PWB FOR WORKING DISPENSER ....................................................................................................................... 12
CAP DUCT MOTOR REPLACEMENT ............................................................................................................................ 12
HOW TO REMOVE A ICE BIN ........................................................................................................................................ 13
HOW TO INSERT A ICE BIN ........................................................................................................................................... 13
HOW TO REMOVE AND REINSTALL THE PULLOUT DRAWER ............................................................................. 14-15
WATER VALVE DISASSEMBLY METHOD .................................................................................................................... 16
FAN AND FAN MOTOR DISASSEMBLY METHOD ........................................................................................................ 16
TOP DRAWER ................................................................................................................................................................. 17
BOTTOM DRAWER ......................................................................................................................................................... 17
4. ADJUSTMENT ........................................................................................................................................................... 18-19
COMPRESSOR ................................................................................................................................................................ 18
INTRODUCTION OF E-LINEAR COMPRESSOR ...................................................................................................... 18-20
5. CIRCUIT DIAGRAM ................................................................................................................................................... 21-22
6. TROUBLESHOOTING .................................................................................................................................................... 23
7. PCB PICTURE ........................................................................................................................................................... 24-26
8. Troubleshooting With Error Display ....................................................................................................................... 27-35
9. Troubleshooting Without Error Display ................................................................................................................. 36-44
10. Reference .................................................................................................................................................................. 45-48
11. COMPONENT TESTING INFORMATION ................................................................................................................. 48-56
12. TROUBLESHOOTING .............................................................................................................................................. 57-63
13. ICEMAKER OPEARTING AND TROUBLE SHOOTING METHOD ......................................................................... 64-67
14. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM ........................................................................................... 68-71
SAFETY PRECAUTIONS
Please read the following instructions before servicing your refrigerator.
1. Unplug the power before handling any elctrical componets.
2. Check the rated current, voltage, and capacity.
3. Take caution not to get water near any electrical components.
4. Use exact replacement parts.
5. Remove any objects from the top prior to tilting the product.
-2-
1. SPECIFICATIONS
1-1 LMX28988**
●
28 cu.ft.
ITEMS
SPECIFICATIONS
ITEMS
SPECIFICATIONS
DOOR DESIGN
Side Rounded
VEGETABLE TRAY
Clear Drawer Type
DIMENSIONS (inches)
35 3/4 X 35 3/8 X 69 3/4 (WXDXH) 28cu.ft.
COMPRESSOR
Linear
NET WEIGHT (pounds)
165 kg. (364 lb)
EVAPORATOR
Fin Tube Type
COOLING SYSTEM
Fan Cooling
CONDENSER
Spiral Condenser
TEMPERATURE CONTROL Micom Control
REFRIGERANT
R-134a (145 g)
DEFROSTING SYSTEM
Full Automatic
LUBRICATING OIL
ISO10 (280 ml)
Heater Defrost
DEFROSTING DEVICE
SHEATH HEATER
DOOR FINISH
PCM, VCM, Stainless
HANDLE TYPE
Bar
INNER CASE
ABS Resin
INSULATION
Polyurethane Foam
REFRIGERATOR
LED Module(24)
FREEZER
LED Module(24)
LAMP
DIMENSIONS
Description
LMX28988**
Depth w/ Handles
A
35 3/8 in
Depth w/o Handles
B
32 7/8 in
Depth w/o Door
C
29 in
Depth (Total with Door Open)
D
47 5/8 in
Height to Top of Case
E
68 3/8 in
Height to Top of Door Hinge
F
69 3/4 in
Width
G
35 3/4 in
Width (door open 90 deg. w/o handle)
H
39 1/4 in
Width (door open 90 deg. w/ handle)
I
44 1/4 in
-3-
1-2 LMX25988**
●
25 cu.ft.
ITEMS
SPECIFICATIONS
ITEMS
SPECIFICATIONS
DOOR DESIGN
Side Rounded
VEGETABLE TRAY
Clear Drawer Type
DIMENSIONS (inches)
32 23/32 X 35 3/8 X 69 3/4 (WXDXH) 25cu.ft.
COMPRESSOR
Linear
NET WEIGHT (pounds)
153kg (337lb)
EVAPORATOR
Fin Tube Type
COOLING SYSTEM
Fan Cooling
CONDENSER
Spiral Condenser
TEMPERATURE CONTROL Micom Control
REFRIGERANT
R-134a (130 g)
DEFROSTING SYSTEM
Full Automatic
LUBRICATING OIL
ISO10 (280 ml)
Heater Defrost
DEFROSTING DEVICE
SHEATH HEATER
DOOR FINISH
PCM, VCM, Stainless
HANDLE TYPE
Bar
INNER CASE
ABS Resin
INSULATION
Polyurethane Foam
REFRIGERATOR
LED Module(18)
FREEZER
LED Module(12)
LAMP
DIMENSIONS
Description
LMX25988**
Depth w/ Handles
A
35 3/8 in
Depth w/o Handles
B
32 7/8 in
Depth w/o Door
C
29 in
Depth (Total with Door Open)
D
46 3/64 in
Height to Top of Case
E
68 3/8 in
Height to Top of Door Hinge
F
69 3/4 in
Width
G
32 23/32 in
Width (door open 90 deg. w/o handle)
H
36 7/32 in
Width (door open 90 deg. w/ handle)
I
41 7/32 in
-4-
2. PARTS IDENTIFICATION
4
1
6
2
5
6
4
3
1 ADJUSTABLE REFRIGERATOR SHELVING
The refrigerator compartment shelves are adjustable to
allow flexibility for storage needs.
2 GALLON STORAGE BINS
Three interchangeable bins can be arranged to suit your
storage needs.
3 REMOVABLE ICE STORAGE BIN
The ice storage bin can be removed to fill ice buckets,
coolers, or pitchers.
4 LED INTERIOR LAMPS
Two separate LED arrays light the freezer and
refrigerator interiors.
5 CAN STORAGE BIN
6 FIXED DOOR BINS
-5-
3. DISASSEMBLY
3-1 REMOVING AND REPLACING REFRIGERATOR DOORS
●
Removing Refrigerator Door
CAUTION: Before you begin, unplug the refrigerator. Remove food and bins from doors.
▶ Left Door -FIG. 2
1. Disconnect water supply tube by pushing back on the disconnect ring (3).-FIG. 1
2. Open door. Loosen top hinge cover screw (1).
Use flat tip screwdriver to pry back hooks on front underside of cover (2). Lift up cover.
3. Disconnect door switch wire harness and remove the cover.
4. Pull out the tube.
5. Disconnect all 3 wiring harnesses (4). Remove the grounding screw (5).
6. Rotate hinge lever (6) counterclockwise. Lift top hinge (7) free of hinge lever latch (8).
CAUTION: When lifting hinge free from the latch, be careful that door does not fall forward.
7. Lift door from middle hinge pin and remove door.
8. Place the door with the insides facing up, on a not scratch surface.
▶ Right Door -FIG. 3
1.
2.
3.
4.
Open the door, remove 1 screw on the top of the hinge cover. Loosen top hinge cover screw (1). Lift up cover (2).
Disconnect door switch wire harness and remove the cover.
Rotate hinge lever (3) clockwise. Lift top hinge (4) free of hinge lever latch (5).
Lift door from middle hinge pin and remove door.
CAUTION: When lifting hinge free from the latch, be careful that the door does not fall forward.
5. Place the door with the insides facing up, on a not scratch surface.
Figure 2
Figure 3
Figure 1
1) Insert the tube until you can see only one of
the lines printed on the tube.
2) After inserting, pull the tube to ascertain that
it is secure.
3) Assemble clip.
Correct
-6-
Incorrect
3-2 DOOR
●
Mullion Removal
1. Remove 2 screws.
●
Door Gasket Replacement
1. Insert gasket into channel
Press gasket into channels on the four remaining
sides of door.
2. Lift Mullion up carefully.
●
Mullion Replacement
1. Connect wire harness.
3. Disconnect wire harness.
2. Insert mullion into the channel.
Insert the cover assembly into bracket, door.
●
Door Gasket Removal
1. Remove gasket
Pull gasket free from gasket channel on the four
remaining sides of door.
3. Assemble 2 screws.
-7-
* Ice Fan Scroll Assembly Replacement
3-3 Door Alignment
If the space between the door are uneven,
follow the instructions to align them.
Remove the Base Grillie. Turn the leveling legs counter
clock wise to raise or clock wise to lower the height of the
front of the refrigerator by using flat blade screw driver or
11/32" wrench. Use the wrench (Included with the User
Manual) to adjust the bolt in the door hinge to adjust the
height. (CCW to raise or CW to lower the height.)
1) Remove the plastic guide on the left side, using a
phillips screwdriver to remove the screws.
2) Pull off the sensor cover.
3) Remove the grill cover.
4) Gently pull on the grill assembly to remove.
5) Disconnect the wiring harness.
6) Remove all screws on the scroll assembly.
3-4 FAN AND FAN MOTOR(EVAPORATOR)
1. Remove the freezer drawer. (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 4 screws and pulling the
grille forward.
4. Remove the Fan Motor assembly by loosening 3 screws
and disassembling the shroud.
5. Pull out the fan and separate the Fan Motor and Bracket.
FAN MOTOR
Shroud
(1)
(2)
(3)
(4)
(5)
(6)
3-5 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 46F(8°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 1)
2. Separate the connector with the Defrost Control
assembly and replace the Defrost Control assembly after
cutting the Tie Wrap. (Figure 2)
GRILLE ASSEMBLY
BRACKET
MOTOR
Figure 1
-8-
DEFROST-CONTROL
ASSEMBLY
Figure 2
3-6 LAMP
3-6-2 Freezer Compartment Lamp
Unplug, or disconnect power at the circuit breaker.
If necessary, remove top shelf or shelves.
1. Unplug refrigerator power cord form outlet.
2. Remove screw with driver.
3. Grasp the cover Lamp, pull the cover downward.
3-6-1 Refrigerator Compartment Lamp
1) Release 2 screws.
2) Hold both ends and pull down to remove.
3) To remove the lamp case and cover, release 2 screws
as shown.
3-7 MULTI DUCT
1. Romove the upper and
lower caps with a flat
screwdriver and remove
2 screws.
(Figure 3)
2. Disconnect the lead wire
on the bottom position.
4) Use a flat tool as shown below to remove the lamp
cover.
Figure 3
5) To remove the LED assembly, pull apart the cover.
Case, lamp
Cover, lamp LED, Assembly
-9-
3-8 MAIN PWB
1) Loosen 3 screws on the PWB cover.
4) Holding the inner side of
the dispenser pull
forward to remove.
5) Remove the
lead wire.
CAUTION: When replacing the dispenser cover make
sure the lead wire does NOT come off and the water line
is not pinched by the dispenser.
2) Remove the PWB cover
3) Disconnect wire harness and replace the main PWB in
the reverse order of removal.
3-10 DISPLAY PCB
As shown below, remove 1 screw on the PCB fixing screw.
Remove the display PCB fixing screw.
Case, PCB
3-9 DISPENSER
Display PCB
3-11 ICE BUTTON ASSEMBLY
1) Remove the 1 screw holding the lever.
2) Remove the spring from the hook.
3) Push and pull on the tab to remove.
1) Pull out the drain
2) Use these 2 holes to pull
out the bottom
Button Lever
3) If nozzle is interfered with button, push and pull out the
bottom of button and then pull out the right side.
- 10 -
3-12 WATER BUTTON ASSMEBLY
3-14 ICEMAKER REPLACEMENT
1) Remove screws.
2) Grasp the Button assembly and lift.
1) Remove 4 screws as shown.
Button Lever
3-13 ICE CORNER DOOR REPLACEMENT
2) Grasp the bottom of motor cover assembly and pull
slowly.
1) Loosen the front screw as shown in the picture.
2) Lift up the hinge with one hand.
3) Pull out the Ice Corner Door with the other hand.
hinge
3) Disconnect wire harness from wall of compartment.
In-door
motor
- 11 -
CAUTION: Make sure that the motor housing is taped to
the mold, if not positioned correctly the cover will not fit
properly.
3-16 CAP DUCT MOTOR REPLACEMENT
1) Separate the Housing of the Cap Duct Motor.
2) Unscrew 3 screws to disassemble the motor.
3) When replacing the motor, check the position of the door
duct and the link for proper fit.
3-15 SUB PWB FOR WORKING DISPENSER
1) Disconnect the wire harness.
Duct Door
Link
Cap Duct Motor
NG Position
2) Remove 1 screw from PWB and replace with new PWB.
4) Insert 2 screws.
5) Push housing aside.
- 12 -
3-17 HOW TO REMOVE A ICE BIN
3-18 HOW TO INSERT A ICE BIN
1) Grip the handles, as shown.
1) Insert the Ice Bin, slightly tilting to avoid touching the
Icemaker. (Especially, Ice-Detecting Sensor)
2) Tilt and lift slightly as shown.
3) Remove ice bin slowly.
- 13 -
3-19 HOW TO REMOVE AND REINSTALL THE PULLOUT DRAWER
3-19-1 Follow Steps to Remove
Step 1) Open the freezer door.
Step 2) Remove the lower basket.
Step 3) Remove the two screws from the guide rails
(one from each side).
Step 4) Lift the freezer door up to unhook it from the rail
support and remove.
Pull both rails to full extension.
Step 5) First: Remove the gear from the left side first by releasing the tab behind the gear, place a screwdriver between the
gear and the tab and pull up on the gear.
Second: Remove the center rail.
Third: Remove the gear from the right side by following the same steps for the left side.
NOTE: THIS TAB MUST BE PUSHED IN TO RELEASE THE GEAR.
Pull the Tab from the Motor.
- 14 -
3-19-2 Follow Steps to Reinstall
Step 1) Reinstall the right side gear into the clip.
Step 2) Insert the rail into the right side gear. Gears do not
need to be perpendicular to each other.
Step 3) Insert the rail into the left side gear, and insert the
gear into the clip.
Step 4) The rail system will align itself by pushing the rails
all the way into the freezer section.
Pull the rails back out to full extension.
Step 5) Reinstall the freezer door by inserting the rail tabs
into the guide rail.
Step 6) Reinstall the two screws into the guide rails
(one from each side).
Step 7) Reinstall the lower basket, and close the freezer
door.
- 15 -
3-20 WATER VALVE DISASSEMBLY METHOD
1) Turn off the water to unit. Remove the waterline from the
valve.
3-21 FAN AND FAN MOTOR DISASSEMBLY
METHOD
1) Remove screws for the Drain Pipe Assembly and the 1
connected to the Motor Cover.
MOTOR COVER
Figure 63
Figure 59
2) Separate the Fan Assembly and Motor, turn counter
clockwise to remove from the motor shaft.
2) Remove cover and 1 screw from the valve.
Mechanical Cover
FAN ASSEMBLY
MOTOR
Figure 60
3) Separate the housing and remove the valve.
Figure 64
Assemble in reverse order. Taking care to avoid.
1. Do not to bend the tube during assembly.
2. Press the Water Dispenser button letting water pour out,
this checks for any leaks in the tube connection, this may
vary depending on the water pressure
( about 2 minutes.).
Housing
Figure 61
4) Remove the clip, and press the collet to separate the
tube from the connector. Note: there maybe some water
in the line.
Figure 62
- 16 -
3-22 TOP DRAWER
To remove the freezer drawer, pull the drawer open to full extension. Remove the drawer and Ice Bin lifting the basket from
the rail system.
3-23 BOTTOM DRAWER
To remove the freezer drawer, pull the drawer open to full extension. Remove the lower DuraBase ®basket by lifting the
basket from the rail system.
- 17 -
4. ADJUSTMENT
4-1 COMPRESSOR
4-2 INTRODUCTION OF E-LINEAR COMRESSOR
4-1-1 Role
E-Linear compressor is run by mechanical part design
through automatically varying the cooling power. The
main parts consist of compressor and Sub PCB which
controls the compressor. PCB authorizes constant
voltage and constant frequency to the compressor and
protects it.
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.
4-2-1 Control of Compressor Block Diagram
4-1-2 Note for Usage
(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 Cover PTC
Compressor may fail due to breakdown of their
insulating capabilities.
(4) Always use the Parts 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. Use only approved substitute parts.
Compressor Controller
Main
Micom
PWM
Signal
Frequ
-ency
Inverter
Linear
Comp
DC link
Voltage
Vcap Voltage
Counter electromotive force
Calculate counter
electromotive force
4-1-3 Remove the cover PTC
Control Block Diagram of Compressor
4-2-2 Compressor operating pattern
Drive half stroke after turning on initial power for 30
seconds. Then, slowly increase stroke and reach target
input. Once reaching the target input, input naturally
changes according to refrigerator load without any special
control.
(1) Remove the Cover Back M/C
Comp. input
(2) Loosen two screws on comp base
❶
(3) Use a L-shaped flap tooll to pry off the cover
(4) Assembly in reverse order of disassembly
❷
❸
Interval 1) Half stroke interval - after initial running, stay at
the initial value for 30 seconds
Interval 2) Running interval - Increase at every 0.8 till it
reaches the target input; it takes about 3’ 45”
Interval 3) CVCF interval - Run by target voltage and main
operating frequency and the input naturally
changes according to refrigerator load
- 18 -
4-2-3 Compressor protection logic
4-2-4 Compressor problems diagnosis
Since linear Comp conducts linear reciprocating motion,
we have protection logic for compressor, motor and PCB
as the below.
When there is a problem or failure with the `operation,
you are kindly recommended to check it as follows ;
1) Check to normality by measurement of resistance
- Stroke Trip
During the operation, if stroke is above the target value,
decrease the target volt by 3V.
Measure the resistance between poles of the hermetic
terminal (as shown picture) with a multi-tester.
(measurement several minutes after power off)
- Current Trip
Current trip is set in order to protect compressor
mechanical part and drive from the overcurrent that might
arise during the operation.
Check the current for every 416.7us and if the Trip
exceeds 1.86Arms more than three times at Comp ON,
forcibly stop and restart six minutes later.
- Lock Piston Trip
If stroke is under 5mm even if the current is more than
14Arms, Take it as ‘piston lock’ and restart after 2’30” of
Comp OFF. Check the current and stroke for every
416.7us and if the condition fits more than three times at
Comp ON, the Trip occurs.
P : Power Line
C : Common Line
Multi-tester
Case 1-1
If the measured values lie in the normal resistance range as
in the table below,
Compressor is normal.
- IPM fault Trip
It occurs if FO signal received from IPM is LOW. For
every 416.7us, check whether FO signal is LOW. The trip
occurs if it is found three times during the five
periods(83ms).
Case 1-2
If the measured values are above several MΩ or a infinity,
Wire is disconnected in the shell.
Case 1-3
If the measured values are excessively of small number,
There is short somewhere in the shell.
Normal resistance range (measured at ambient
temperature 23℃)
Resistance
FC75LANE
6~8 Ω
According to ambient temperature or operation situation,
the values could show a little deviation.
- 19 -
2) Check to normality by measurement of Voltage
3) Check problems by LED On & Off Count _ (Sub PCB)
Measure the resistance between pin of the connector (as
shown picture) with a multi-tester.
If compressor protection logic is running, LED Lamp’s
blinking frequency of sub PCB, which takes in charge of
control, can help estimate the protection logic’s symptoms
and the cause of its problems.
<Fig. 1>
Trip name
Led Times
Comp Off Time
Stroke Trip
2
1min
Current Trip
6
6min
Lock Piston Trip
5
2min 30sec
IPM fault trip
7
20sec
<Fig. 2>
Standard for normality
- In order to decide whether compressor operating is normal
or not, check the output transfer during the refrigerator
operation.
- After input the initial power and compressor operates, wait
for 10 minutes to estimate.
- Compressor operation may be diagnosed as normal if the
voltage falls between 145V and 180V.
Warning
1. Please be cautious of electric shock and short (it is
estimated after turning on initial power).
2. If the voltage is estimated less than 80V, it is diagnosed
as bad.
- Current Trip PCB defects or Cycle clogging maybe the
causes. After estimating winding resistance, estimate
compressor operation voltage to check if there is any
problem and take actions to repair cycle at replacement of
compressor.
- Stroke Trip can occur when the surrounding
temperature is high, C-Fan, F-Fan and so on are
constrained, or when cycle problems, such as moisture
blocking or compressor defect, are related.
- Lock Piston Trip Since compressor itself can be a
potential cause of a defect, estimate the compressor
resistance value according to #1’s compressor winding
value estimation method and estimate the #2’s
compressor operation voltage to decide whether it is
defective or not
(Before replacement of compressor, replace PCB and
conduct the replacement of compressor during
compressor replacement)
- IPM fault Trip Replace sub PCB since there is high
chance that it is caused by sub PCB’s part defect.
- 20 -
5. CIRCUIT DIAGRAM
5-1 LMX28988**
- 21 -
5-2 LMX25988**
- 22 -
6. TROUBLESHOOTING
6-1 Error Code Summary
WARNING: When checking Resistance values, make sure to
turn off the power, and wait for the voltage to
discharge.
NOTE) Within 3 hours after the error : Press the Ice Plus button and Freezer button simultaneously
3 hours after the error : All errors, except for "Er rt", "Er SS",
"Er IS(except for Icing sensor)", "Er gF", "Er It" error, are displayed.
"Er IS" which is displayed without input of user is the error of Icing Sensor.
Error Display
NO
Error Detection
Category
1
Normal
2
3
4
Freezer Sensor
Error
Refrigerator
Sensor Error
Defrosting
Sensor Error
Freezer
Refrigerator
Temperature Temperature
(Error code ) (Error code )
Er
FS
Er
rS
Er
dS
Error Generation Factors
Remark
None
Normal operation of Display
Short or Disconnection
of Freezer Sensor
Short or Disconnection
of Refrigerator Sensor
Short or Disconnection
of Defrosting Sensor
Check each sensor at it’s
connector.
5
Icing Sensor
Error
Er
IS
6
Pantry sensor
error
Er
SS
Short or disconnection of
the sensor about Ice maker
(Icing sensor, Ice maker
sensor)
Short or Disconnection
of Pantry Sensor
7
Room Temp
Sensor Error
Er
rt
Short or Disconnectoin of
Room temp.sensor
8
Ice maker kit
defect
Er
It
Other Electric system error
such as moter, gear, Hall IC,
operation circuit within I/M kit
When the ice does not drop
even when the I/M Test S/W
is pressed
9
Flow
Meter(Sensor)
Defect
Er
gF
Error of flow meter or water
input or low water pressure
Error of flow meter or water
input or low water pressure or
flow meter connection
10
Poor Defrosting
Er
dH
Even though it is passed
1 hour since then Defrosting,
if Defrosting sensor is not
over 46°F(8°C), it is caused
Temperature Fuse
Disconnection, Heater
disconnection, DRAIN Jam,
Poor Relay for Heater
11
Abnormality of
BLDC FAN Motor
for Ice Making
Er
IF
It is caused when feedback
signal isn’t over 65 seconds
during BLDC FAN motor
operating
Poor BLDC Motor connection,
DRIVE IC, and TR
12
Abnormality of
BLDC FAN Motor
for Freezer
Er
FF
It is caused when feedback
signal isn’t over 65 seconds
during BLDC FAN motor
operating
Poor BLDC Motor connection,
DRIVE IC, and TR
13
Abnormality of
BLDC FAN
MOTOR For
Refrigerator
Er
rF
It is caused when feedback
signal isn’t over 65 seconds
during BLDC FAN motor
operating
Poor BLDC Motor connection,
DRIVE IC, and TR
14
Abnormality of
BLDC FAN Motor
for Mechanic
Room
Er
CF
It is caused when feedback
signal isn’t over 65 seconds
during BLDC FAN motor
operating
Poor BLDC Motor connection,
DRIVE IC, and TR
CO
Communication Error
between Micom of Main PCB
and Display Micom
Poor Communication
connection,Poor TR of
Transmitter and Receiver
Tx/Rx between display and
main board.
15
Communication
Error
Er
- 23 -
7. PCB PICTURE
7-1 Main PCB
●
LMX28988**
P/No & MFG
Picture
CON1
CON8
CON6
EBR650027**
(2010.02~)
CON5
CON2
CON4
CON3
CON10
CON203
EBR641739**
(2010.02~)
CON201
- 24 -
CON2
●
LMX25988**
P/No & MFG
Picture
CON1
CON8
CON6
EBR650027**
(2010.06~)
CON5
CON2
CON4
CON3
CON10
CON203
EBR641739**
(2010.02~)
CON201
- 25 -
CON2
7-2 Display PCB & Sub PCB
P/No
Picture
Display PCB
EBR65749301
(2010.02~)
CON103
CON102
CON101
Sub PCB
EBR60070707
(2010.02~)
CON2
- 26 -
8. Troubleshooting With Error Display
8-1 Freezer Sensor Error (Er FS)
No
Checking flow
1
Check for a loose connection.
2
Check the Blue/White to
Blue/White.
Result & SVC Action
Result
SVC Action
0Ω
Short
Change the sensor
OFF
Open
Replace the refrigerator
Other
Normal
Check the Temp and
resistance (Table-1)
<CON6>
<Temperature table-1>
(1) To (2)
Result
-22°F / -30°C
40 ㏀
-13°F / -25°C
30 ㏀
-4°F / -20°C
23 ㏀
5°F / -15°C
17 ㏀
14°F / -10°C
13 ㏀
23°F / -5°C
10 ㏀
32°F / 0°C
8㏀
※ The sensor is sensing the temperature.
For example, 23㏀ indicates -4°F.
- 27 -
8-2 Refrigerator Sensor Error (Er rS)
No
Checking flow
1
Check for a loose connection.
2
Check the White to White.
Result & SVC Action
Result
SVC Action
0Ω
Short
Change the sensor
OFF
Open
Replace the refrigerator
Other
Normal
Check the Temp and
resistance (Table-2)
<CON6>
<Temperature table-2>
(1) To (2)
Result
23°F / -5°C
38 ㏀
32°F / 0°C
30 ㏀
41°F / 5°C
24 ㏀
50°F / 10°C
19.5 ㏀
59°F / 15°C
16 ㏀
※ The sensor is sensing the temperature.
For example, 30㏀ indicates 32°F.
- 28 -
8-3 Icing Sensor Error (Er IS)
No
Checking flow
1
Check for a loose connection.
2
Check the Blue to Blue.
Result & SVC Action
Result
SVC Action
0Ω
Short
Change the sensor
OFF
Open
Replace the refrigerator
Other
Normal
Check the Temp and
resistance (Table-1)
<Temperature table-1>
CON101
(1) To (2)
Result
-22°F / -30°C
40 ㏀
-13°F / -25°C
30 ㏀
-4°F / -20°C
23 ㏀
5°F / -15°C
17 ㏀
14°F / -10°C
13 ㏀
23°F / -5°C
10 ㏀
32°F / 0°C
8㏀
※ The sensor is sensing the temperature.
For example, 23㏀ indicates -4°F.
<Display>
<CON101>
- 29 -
8-4 Defrost Sensor Error (Er dS)
No
Checking flow
1
Check for a loose connection.
2
Check the Orange to Orange.
Result & SVC Action
Result
Check the Brown to Brown.
SVC Action
0Ω
Short
Change the sensor
OFF
Open
Replace the refrigerator
Other
Normal
Check the Temp and
resistance (Table-3)
<Temperature table-3>
<CON6>
(1) To (2)
Result
-22°F / -30°C
40 ㏀
-13°F / -25°C
30 ㏀
-4°F / -20°C
23 ㏀
5°F / -15°C
17 ㏀
14°F / -10°C
13 ㏀
23°F / -5°C
10 ㏀
32°F / 0°C
8㏀
※ The sensor is sensing the temperature.
For example, 23㏀ indicates -4°F.
- 30 -
8-5 Defrost Heater Error (Er dH)
No
1
Checking flow
Result & SVC Action
Check the Door gasket.
Part
2
Check the Defrost control part.
Def’
Heater
3
Input Test 3 Mode.
(Push the button 3 times)
4
Check the Blue to Orange.
<CON3>
5
Release the test mode.
Push the button 1 times. (Normal)
6
Check the Blue to Orange.
SVC Action
0Ω
Go to the 3
Other
Change Fuse-M
Def’
Heater
34~42 Ω
Go to the 3
Other
Change Fuse-M
Def’
Sensor
0Ω
Go to the 3
OFF
Replace product
Fuse-M
Def’
Sensor
Fuse
M
Result
<CON3>
- 31 -
Result
SVC Action
112 ~ 116 V
Go to the 5
0V
Replace Main PCB
Result
SVC Action
0V
Explain to customer
112 ~ 116 V
Replace Main PCB
8-6 Freezer Fan Error (Er FF)
No
Checking flow
Result & SVC Action
1
Reset the unit and
Input Test 1 Mode.
(Push the button 1 time)
2
Open the freezer door and Check the air
flow.
※ While an error code is displayed,
the fan is not working.
3
Check the Fan motor.
4
Check the Fan motor voltage.
Status
SVC Action
No windy
Go to 3
Windy
Go to 4
Rotate fan using your hand.
If it is stuck, change the motor.
(Cause of ice or rust inside of motor)
(1) (2) (3)
<CON4>
- 32 -
Point
Result
SVC Action
(1) ~ (2)
Below 12 V
Change the PCB
(2) ~ (3)
0 or 5 V
Change the motor
8-7 Icing Fan Error (Er IF)
No
Checking flow
Result & SVC Action
1
Reset the unit and
Input Test 1 Mode.
(Push the button 1 time)
2
Open the refrigerator door and Check the
air flow.
※ While an error code is displayed,
the fan is not working.
3
Check the Connector
(Frozen caused the PCB short)
4
Check the Fan motor.
(Frozen, Lock, ect.)
Status
SVC Action
No windy
Go to the 3,4
Windy
Go to the 5
※ Tip
To prevent ice from shorting the
connector a new connector was
developed.
Make sure to order the new one.
Wire seal (Silicon)
4
No
Part Name
Old P/No
New P/No
407A
Duct Asm,
Connector
5209JA
1044A
5209JA
1044A
Check the Fan motor voltage.
(1) (2)(3)
<CON4>
- 33 -
Result
SVC Action
(1) ~ (2)
Below 12 V
Change the PCB
(2) ~ (3)
0 or 5 V
Change the motor
8-8 Condenser Fan Error (Er CF)
No
Checking flow
1
Reset the unit and
Input Test 1 Mode.
(Push the button 1 time)
2
Check the fan rotation.
Result & SVC Action
※ While an error code is displayed,
the fan is not working.
3
Check the Fan motor and surrounding.
4
Check the Fan motor voltage.
(1) (2)(3)
<CON4>
- 34 -
Status
SVC Action
No windy
Check motor
Windy
Go to the 4
Rotate fan using your hand.
If it is stuck, change the motor.
Result
SVC Action
(1) ~ (2)
Below 12 V
Change the PCB
(2) ~ (3)
0 or 5 V
Change the motor
8-9 Communication Error (Er CO)
No
Checking flow
1
Check the loose connection.
2
Check the Red to White/Red.
CON101
<Display>
3
<CON101>
SVC Action
12 V
Go to the 3
Other
Check the Hinge
(loose connection)
Change the Main PCB
Result
SVC Action
0 V or 5 V
Change the Display PCB
Other
Go to the 4
Result
SVC Action
0 V or 5 V
Change the Main PCB
Other
Go to the 5
Result
SVC Action
0 V or 5 V
Change the Display PCB
Other
Go to the 6
Result
SVC Action
0 V or 5 V
Change the Main PCB
Other
Explain to customer
<CON101>
Check the White/Black to White/Red.
CON101
<Display>
5
Result
Check the Orange to White/Red.
CON101
<Display>
4
Result & SVC Action
<CON101>
Check the White/Red to Orange.
<CON5>
6
Check the White/Red to White/Black.
<CON5>
- 35 -
9. Troubleshooting Without Error Display
9-1 Cube mode doesn’t work
No
Checking flow
1
Check the loose connection.
2
Check the Black to White.
(While pushing the lever S/W)
Result & SVC Action
Lever s/w
Result
SVC Action
112 ~ 115 V
Go to the 3
Other
Change PCB
Not
pushing
0 ~2 V
Go to the 3
Other
Change PCB
Lever s/w
Result
SVC Action
9 ~ 12 V
Go to the 4
Other
Change PCB
Not
pushing
0 ~2 V
Go to the 4
Other
Change PCB
Point
Result
SVC Action
31.1 ~ 42.1 Ω
It’s normal
Other
Replace
Geared Motor
9.9 ~ 12.1 Ω
It’s normal
Other
Replace
Dispenser Motor
Pushing
<CON2>
3
Check the RED to White Red.
(While pushing the lever S/W)
Pushing
<CON3>
4
<CON1>
Check the resistance value.
(1) to (2)
(3) to (4)
<Ice Maker>
(2)
(3)
(4)
<Geared Motor>
<Dispenser Motor>
(1)
- 36 -
9-2 Crush mode doesn’t work
No
Checking flow
1
Check for a lose connection.
2
Check the Sky Blue to White.
(While pushing the lever S/W)
Result & SVC Action
Lever s/w
Result
SVC Action
112 ~ 115 V
Go to the 3
Other
Change PCB
Not
pushing
0 ~2 V
Go to the 3
Other
Change PCB
Lever s/w
Result
SVC Action
9 ~ 12 V
Go to the 4
Other
Change PCB
Not
pushing
0 ~2 V
Go to the 4
Other
Change PCB
Point
Result
SVC Action
31.1 ~ 42.1Ω
It’s normal
Other
Replace
Geared Motor
9.9 ~ 12.1Ω
It’s normal
Other
Replace
Dispenser Motor
Pushing
<CON2>
3
Check the RED to White Red.
(While pushing the lever S/W)
Pushing
<CON3>
4
<CON1>
Check the resistance value.
(1) to (2)
(3) to (4)
<Ice Maker>
(1)
(2)
<Geared Motor>
(3)
(4)
<Dispenser Motor>
- 37 -
9-3 Water mode doesn’t work
No
Checking flow
Result & SVC Action
1
Check the loose connection.
2
Check the Purple to White.
(While pushing the lever S/W)
Lever s/w
Result
SVC Action
112 ~ 115 V
Go to the 3
Other
Change PCB
Not
pushing
0 ~2 V
Go to the 3
Other
Change PCB
Lever s/w
Result
SVC Action
112 ~ 115 V
Go to the 4
Other
Change PCB
Not
pushing
0 ~2 V
Go to the 4
Other
Change PCB
Point
Result
SVC Action
360 ~ 420Ω
It’s normal
Other
Replace
Water Valve
360 ~ 420Ω
It’s normal
Other
Replace
Water Valve
Pushing
<CON2>
3
Check the Blue to Gray.
(While pushing the lever S/W)
Pushing
<CON3>
4
Check the resistance value.
(1) (2)
(3) (4)
(1) to (2)
(3) to (4)
Dispenser Ice Maker
<Pilot Valve>
<Water Valve>
Machine Room
In door
- 38 -
9-4 Freezer room LED lamp doesn’t work
No
Checking flow
1
Check the Freezer door switch.
2
Check the door S/W resistance.
Result & SVC Action
If feel sticky, Change the door s/w.
Status
Result
SVC Action
0Ω
Go to the 3
not
Change door S/W
Push
S/W
Infinity
Go to the 3
Status
Result
SVC Action
12 VDC
Go to the 4
Other
Change the PCB
Result
SVC Action
0 ~ 2 VDC
Explain to customer
Other
Change the Door S/W
12 VDC
Explain to customer
Other
Change the LED Lamp
Normal
3
Check the Blue White to White Red.
Normal
Change door S/W
<CON5>
4
Check the Red to Black.
Status
Closed
Open
- 39 -
9-5 Refrigerator room lamp doesn’t work
No
Checking flow
1
Check the Refrigerator door switch.
2
Check the door S/W resistance.
Result & SVC Action
If it is stuck, Change the door s/w.
Status
Result
SVC Action
0Ω
Go to the 3
not
Change door S/W
Push
S/W
Infinity
Go to the 3
Other
Change door S/W
Status
Result
SVC Action
12 V
Go to the 4
Other
Change the PCB
Result
SVC Action
12 V
Go to the 5
Other
Change the LED Lamp
Result
SVC Action
0~2V
It’s normal
Other
Change the Door S/W
12 V
It’s normal
Other
Change the LED Lamp
Normal
3
Check the Black to Orange.
Normal
<CON6>
4
Check the Red to Blue.
Status
Normal
5
Check the Red to Blue.
Status
Closed
Open
- 40 -
9-6 Poor cooling in Fresh food section
No
1
Checking flow
Result & SVC Action
Check the sensor resistance.
<CON6>
※ The sensor is determined by
the temperature.
For example, 30㏀ indicates 32°F.
2
Reset the unit and
Input Test 1 Mode.
(Push the button 1 time)
3
Open the fresh food door and check the
air flow.
4
Check the air temperature. Cold or not ?
- 41 -
Temperature
Result
23°F / -5°C
38 ㏀
32°F / 0°C
30 ㏀
41°F / 5°C
24 ㏀
50°F / 10°C
19.5 ㏀
59°F / 15°C
16 ㏀
Status
SVC Action
Blowing
Go to the 4
Not blowing
Check the R Fan motor
Check the damper
(Go to the 6)
Status
SVC Action
Cold
Go to 5
Not cold
Check the Compressor
And sealed system
No
5
Checking flow
Result & SVC Action
Damper checking method.
Inputting TEST Mode,
Check the damper and PCB.
Test
Mode
Damper
State
1 Mode
Open
2 Mode
Closed
1,2
mode
Not
working
Point
(1) to (2)
(3)
(1)
(4)
(2)
6
7
(3) to (4)
Check the Fan motor.
Rotate fan using your hand.
Stuck change the motor.
(Cause of ice or rust inside of motor)
Point
(1)(2)(3)
<CON4>
- 42 -
Damper is normal.
(Go to 6)
Change the damper
Result
SVC Action
270 ~330Ω
It’s normal
Other
Change damper
270 ~330Ω
It’s normal
Other
Change damper
Result
SVC Action
Sticky
Change the motor
Not Sticky
Go to 7
Point
Result
SVC Action
(1) ~ (2)
Below 12 V
Change the PCB
(2) ~ (3)
0 or 5 V
Change the motor
Motor
Check the R Fan motor voltage.
SVC Action
9-7 Poor cooling in Freezer compratment
No
1
Checking flow
Result & SVC Action
Check the sensor resistance.
<CON6>
※ The sensor is determined by
the temperature.
For example, 23㏀ indicates -4°F.
2
Reset the unit and
Input Test 1 Mode.
(Push the button 1 time)
3
Open the freezer door and check the air
flow.
4
Check the air temperature. Cold or not ?
(1) To (2)
Result
-22°F / -30°C
40 ㏀
-13°F / -25°C
30 ㏀
-4°F / -20°C
23 ㏀
5°F / -15°C
17 ㏀
14°F / -10°C
13 ㏀
23°F / -5°C
10 ㏀
32°F / 0°C
8㏀
Status
SVC Action
Blowing
Go to the 4
Not blowing
Check the F Fan motor
Status
SVC Action
Cold
Not cold
- 43 -
Check the Compressor
And sealed system
9-8 Over cooling in Fresh food compartment
No
1
Checking flow
Result & SVC Action
Check the sensor resistance.
<CON6>
※ The sensor is determined by
the temperature.
For example, 30㏀ indicates 32°F.
2
Reset the unit and
Input Test 1 Mode.
(Push the button 1 time)
3
Open the refrigerator door and
Check the air flow.
4
5
Input Test 2 Mode and check the air flow.
(Push the button 1 time)
Check the damper resistance.
Temperature
Result
23°F / -5°C
38 ㏀
32°F / 0°C
30 ㏀
41°F / 5°C
24 ㏀
50°F / 10°C
19.5 ㏀
59°F / 15°C
16 ㏀
Status
SVC Action
Blowing
Go to the 4
Not blowing
Check the R Fan
Check the damper
(Go to the 5)
Status
SVC Action
Blowing
Go to the 5
Not blowing
It’s normal
Point
(1) to (2)
(3)
(2)
(1)
(4)
(3) to (4)
- 44 -
Result
SVC Action
270 ~330Ω
It’s normal
Other
Change damper
270 ~330Ω
It’s normal
Other
Change damper
10. Reference
10-1 TEST MODE and Removing TPA
1. How to enter the TEST MODE
Push the test button on the Main PCB to enter the TEST MODE.
* 1 time : Comp / Damper / All FAN on
(Everything is displayed)
* 2 times : Damper closed
(22 22 displayed)
* 3 times : Forced defrost mode
(33 33 displayed)
Main PWB
2. How to remove Terminal Position Assurance (TPA)
<AC TPA>
<DC TPA>
※ After measure the values, you should put in the TPA again.
- 45 -
10-2 TEMPERATRUE CHART - FRZ AND ICING SENSOR
TEMP
RESISTANCE
VOLTAGE
-39°F (-40°C)
73.29 ㏀
4.09 V
-30°F (-35°C)
53.63 ㏀
3.84 V
-21°F (-30°C)
39.66 ㏀
3.55 V
-13°F (-25°C)
29.62 ㏀
3.23 V
-4°F (-20°C)
22.33 ㏀
2.89 V
5°F (-15°C)
16.99 ㏀
2.56 V
14°F (-10°C)
13.05 ㏀
2.23 V
23°F (-5°C)
10.10 ㏀
1.92 V
32°F (0°C)
7.88 ㏀
1.63 V
41°F (5°C)
6.19 ㏀
1.38 V
50°F (10°C)
4.91 ㏀
1.16 V
59°F (15°C)
3.91 ㏀
0.97 V
68°F (20°C)
3.14 ㏀
0.81 V
77°F (25°C)
2.54 ㏀
0.67 V
86°F (30°C)
2.07 ㏀
0.56 V
95°F (35°C)
1.69 ㏀
0.47 V
104°F (40°C)
1.39 ㏀
0.39 V
- 46 -
10-3 TEMPERATRUE CHART - REF AND DEF SENSOR
TEMP
RESISTANCE
VOLTAGE
-39°F (-40°C)
225.1 ㏀
4.48 V
-30°F (-35°C)
169.8 ㏀
4.33 V
-21°F (-30°C)
129.3 ㏀
4.16 V
-13°F (-25°C)
99.30 ㏀
3.95 V
-4°F (-20°C)
76.96 ㏀
3.734 V
5°F (-15°C)
60.13 ㏀
3.487 V
14°F (-10°C)
47.34 ㏀
3.22 V
23°F (-5°C)
37.55 ㏀
2.95 V
32°F (0°C)
30 ㏀
2.67 V
41°F (5°C)
24.13 ㏀
2.40 V
50°F (10°C)
19.53 ㏀
2.14 V
59°F (15°C)
15.91 ㏀
1.89 V
68°F (20°C)
13.03 ㏀
1.64 V
77°F (25°C)
10.74 ㏀
1.45 V
86°F (30°C)
8.89 ㏀
1.27 V
95°F (35°C)
7.40 ㏀
1.10 V
104°F (40°C)
6.20 ㏀
0.96 V
- 47 -
Compressor Troubleshooting
Step 1) Open PWB cover
Step 2) Check for blinking frequency of LED, PWB
If compressor is normal, it does not blink
: Refer to the next page to find out what actions to take according to how many times LED blink
- 48 -
Actions to take according to Led blinking frequency
No
LED operating condition
Cause
LED two - time repetiton
PCB part
defect
(piston
overrun)
1
on - on - off - on - on - off - on - on - off
repeating
on - on - on - on - off - on - on - on - on - off
outlet
clogging
piston
constraint
1. After resetting
power, check if it is
running normal
2. If the same
symptom arises after
the first action,
replace PCB
3. If the same
symptom arises after
the second action,
replace compressor
repeating
LED five - time repetiton
3
on - on - on - on - on - off - on - on - on - on - on - off
repeating
LED six - time repetiton
4
on - on - on - on - on - on - off - on - on - on - on - on - on - off
1. After resetting
power, check if it is
running normal
If the same symptom
circuit
arises after the first
overcurrent action, replace PCB
error
If the same symptom
repeating
arises after the
second action,
replace compressor
LED seven- time repetiton
5
on - on - on - on - on - on - on - off - on - on -on - on - on - on- on - off
- 49 -
1.After resetting
power, check if it is
running normal
2.If the same
symptom arises after
the first action,
replace PCB
1.After resetting
power, check if it is
running normal
2.If the same
symptom arises after
the first action,
replace PCB
3.If the same
symptom arises after
the second action,
replace compressor
LED four - time repetiton
2
Service guideline
repeating
PCB part
defect
(IPM)
1.After resetting
power, check if it is
running normal
2. If the same
symptom arises after
the first action,
replace PCB
10-4 How to check the Fan-Error
(1) EBR650027**
After sending a signal to the fan, the MICOM checks the BLDC fan
motor s lock status. If there is no feedback signal from the BLDC fan,
the fan motor stops for 10 seconds and then is powered again for 15
seconds. To determine that there is a fan motor malfunction,
this process is repeated 3 times. If the fan motor is determined to be
defective, the error code will be shown in the display for 30 minutes.
At this point, the process will be repeated until the fan motor operates
normally. If normal operation is achieved, the error display is erased and
the MICOM is reset automatically.
No signal
Error Display
15s
Normal drive
15s
10s
15s
10s
No signal
Repeat
20s
Pause 30min
15s
10s
15s
10s
20s
Pause 30min
- 50 -
10s
11. COMPONENT TESTING INFORMATION
11-1 Defrost Controller Assembly
Function
The controller assembly is made up of two different kinds of parts. The fuse and the sensor.
To determine if these parts are defective, check for resistance. The fuse will cut power to the
defrost heater at very high temperatures.
How to
Measure
(Fuse-M)
Set a ohmmeter to the 2 housing pin.
Measure the 2 pin connected to Fuse-M.
If the ohmmeter indicate below 0.1ohm
fuse-m is a good condition, But if infinite the
part is bad.
(1) to (2)
How to
Measure
(Sensor)
Set a ohmmeter to The 2housing pin.
Measure the 2 pin connected to Sensor.
If the ohmmeter indicate 11㏀ (at room
temperature) Sensor is good.
When check the ohm at other temperatures
Check the sensor manual.
(1) to (2)
Standard
Fuse-M (at all temperature)
Sensor (at room temperature)
Test Point
Ressult
Test Point
Ressult
(1) to (2)
0 ~ 0.1Ω
(1) to (2)
11Ω
- 51 -
11-2 Sheath Heater
Function
Sheath heater is a part for defrost. All heating wire is connected to only one line. To check if
the part is defective, check the resistance.
How to
Measure
(1) (2)
Set a ohmmeter connect to The 2 housing pin.
Measure the 2 pin connected to Sheath Heater.
If the ohmmeter indicate (V°øV)/Watt=R is good condition,
ex) when watt=350w, voltage=115v R=(115°ø115)/350=38Ω
But if the ohm meter indicate infinity the Sheath heater is bad.
Standard
Sheath heater (at all temperature)
Test Point
Ressult
(1) to (2)
34 ~ 42Ω
- 52 -
11-3 Door Heater Assembly
Function
The heater is designed to prevent the door from sweating.
How to
Measure
1
3
6
2
4
7
5
8
9
Standard
Test Point
Ressult
(1) to (2)
2.3 ~ 2.9Ω
- 53 -
11-4 Door Switch
Function
The switch senses if the door is open or closed.
- When the door open, lamp on.
- When the door open, the switch give information to Micom.
When the door open, internal contact operate on and off moving plunger of door switch up
and down.
How to
Measure
<Switch, Freezer>
<Switch, Refrigerator>
Button
(Plunger)
1
2
3
3
4
1
4
2
2
Beep
Beep
Check the resistance between connectors 1, 2 and 3, 4 .It means
check whether or not applying an electric current. If there is
resistance, the switch is good.
Standard
Multimeter beep – Switch F,R
Nomal
Push the button(Plunger)
Beep or 0Ω
None (∞Ω)
- 54 -
3
1
4
11-5 Dispenser DC Motor
Function
- Dispenser DC Motor : When customer push the dispenser button, Pull duct door and
abstract from ice bank.
How to
Measure
(1)
(2)
Dispensor DC Motor
Standard
Dispenser DC Motor
Test Points
Result
(1) to (2)
9.9 ~ 12.1Ω
- 55 -
11-6 AC Motor ASSEMBLY
Function
The motor in the door pushed the ice into the dispenser.
How to
Measure
< In-door Motor >
(1)
< In-door Motor >
1 Separate the
housing.
1 Separate the
housing.
2 Measure the
resistance between
(1) and (2)
2 Measure the
resistance between
(1) and (3)
(2)
(1)
(3)
Check the resistance between connectors (In-door motor 1, 2) and
(In-door motor 1, 3). It means check whether or not applying an
Electric current. If there is resistance, it means the geared motor or
solenoid is not inferiority
Standard
Geared Motor
Cube Solenoid
Test Points
Result
Test Points
Result
(1) to (2)
31.1 ~ 42.09Ω
(1) to (3)
31.1 ~ 42.09Ω
- 56 -
11-7 Damper
Function
The damper supplies cold air from the freezer to the chill room using the damper plate. The
chill room is colder when the damper plate is open. When the damper is closed the chill
rooms temperature will rise.
How to
Measure
< Damper Circuit >
1
Blue
1
2
Blue
Red
3
3
White
White
Check the
3 Yellow
1 , 3
< extension >
Check the 2 , 4
Check the
1 , 3
Check to see if there is electrical current, if there is resistance the damper is good.
Standard
Damper
Test Points
Result
Test Points
Result
Red and Yellow
373 ~ 456Ω
Blue and White
373 ~ 456Ω
- 57 -
11-8 Lamp Socket
Function
The lamp socket connect cover lamp assembly to lamp.
The lamp socket fix lamp and unite lamp and cover lamp assembly.
The lamp socket supply electric source to lamp also.
How to
Measure
(1)
(2)
(3)
(4)
Check the resistance between connector of housing and connector of lamp socket. It means
check whether or not applying an electric current.
If there is resistance it means the lamp socket is good.
Standard
Test Points
Result
(1) to (2) and (3) to (4)
0Ω
- 58 -
11-9 Flow Sensor
Function
Flow Sensor (in machine room)
Count the water quantity from city water to water filter in refrigerator
How to
Measure
Flow Sensor
(in machine room)
Standard
Test Points
Result
Red wire to Black wire
4 ~ 30 kΩ
- 59 -
12. TROUBLESHOOTING
12-1 INFORMATION OF LINEAR COMPRESSOR
The information tag provides compressor model, refrigerant, serial number and safety approval
Compressor Label
1. Compressor Model
FC75LANE
Operating Type
A : A-Inverter
E : E-Inverter
Series name
DLF/FA/FB
Displacement
ex)90=9.0cm3/stroke
Application Category
- L : LBP with R134a
- H : HBP with R134a
- N : LBP with R600a
Rated Voltage
& Frequency
- M : 220V 50/60Hz
- N : 115V 50/60Hz
Efficiency version
A : 1st generation
B : 2nd generation
2. Refrigerant
Name Plate
FC75LANE
3. Serial Number
00 00 9 2003 5 13 0012
Buyer Code
Model Code
Line
Size : 90mm X 20mm
!
Serial No.
Date
Month
1 : January
O : October
N : November
~
Year 9 : September D : December
"
4. Safety Approval
Ex)
There are two types of controllers used in the linear compressor system.
- The “E”-inverter system is used with the FC75LANE compressor.
Refrigerator
Comp Drive
Compressor
Comp On/Off
Inverter
CVCF
Self
Modulation
FC75LANE
E-Inverter
System
**CVCF : Constant Voltage Constant Frequency
- 60 -
To reduce noise level, the piston stroke is slowly increased to full power during start up.
Step 1) Start up - Half stroke interval for first 30
seconds.
Step 2) Ramp up - Stroke increases every 0.8sec until
maximum stroke length is reached (about 3
min, 15 sec)
Step 3) CVCF interval - 180V / 60Hz
Step 1) Start up - Half stroke interval for first 20
seconds.
Step 2) Ramp up - Stroke increases until maximum
stroke length is reached (about 1 min, 40 sec)
Step 3) VVVF interval - target voltage and frequency
controlled by Control Board signals
There are 6 protection logics designed to protect the linear compressor system. When a failure is detected,
the compressor will shut and will try to restart after a set period of time for each type of failure. The LED
located on the inverter drive PCB will flash the appropriate code to indicate the detected failure. This code will
continue to flash until the unit is disconnected from the power source.
Inverter Error Codes
FCT0
Stroke Trip
Locked Piston
Trip
Current Trip
IPM Fault
Communication
Error
App.
Requirement
Waiting Time
The number of
LED flashes
A-Inv.
Compressor current and voltage error.
20 sec.
1
Piston stroke overrun detected.
1 min.
2
Piston is locked.
2 min. 30 sec.
5
Current overload detected.
2 min. 30 sec.
6
High current detected due to IPM failure.
2 min. 30 sec.
7
Miscommunication with Refrigerator
0
8
E-Inv.
A-Inv.
E-Inv.
A-Inv.
E-Inv.
A-Inv.
E-Inv.
A-Inv.
A-Inv.
- 61 -
Bridge Diodes converts 115V AC (Alternating current) to 115V DC (Direct current)
The Voltage Multiplying circuit then increases the 115V DC to 230V DC.
Then the IPM (Intelligent Power Module) converts the 230V DC to 230V AC.
The converted AC power can be regulated to any required voltage and frequency.
E-Inverter
FC75LANE
A-Inverter
FC90LANA
There are two PCB located behind the PCB cover.
One is the main PCB, and the other is the driver PCB
the linear compressor.
Measure the voltage at locations on the connector (as shown picture) with a multi-tester.
Multi
Tester
E-Inverter
Multi
Tester
A-Inverter
IPM Voltage Check
To ensure proper diagnosis, make sure that the unit
has been plugged in for at least 10 min.
To determine if the compressor is receiving the
proper voltage, check the PCB output voltage
during operation.
Normal operating voltage will be between 80V AC
and 180V AC.
Note : Higher voltage readings may occur under
“heavy” load conditions.
- 62 -
Insulation check : Check for infinite Ohms between all compressor terminal and ground.
FC75LANE
Capacitor Spec.
550V/10uF
5%
Po
N/C
Co
Po : Power
Co : Common
N/C : No Connecting
Compressor Winding Resistance Check
6 ~ 8 Ω Between Po and Co
LG Linear Compressor
NOTE : Any Terminal to Ground should
read Inf ( ~ )
Inf (~)
6~8Ω
6~8Ω
GN
GND
- 63 -
Inf (~)
12-2 SERVICE DIAGNOSIS CHART
COMPLAINT
POINTS TO BE CHECKED
•
•
•
•
Plug into the outlet.
Set the switch to ON.
Replace the fuse.
If the voltage is low, correct the wiring.
No Cooling.
•
•
•
•
Cools poorly.
• 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.
• Place the unit about 4 inches (10 cm) from
the wall.
• Place the unit away from these heat sources.
• Lower the ambient temperature.
• Is food placed in the cooling air outlet?
• Check if the control is set to colder position.
• Is the ambient temperature below 41°F(5°C)?
• Place foods in the high-temperature section.
(front part)
• Set the control to Recommended position.
• Set the control to Warm position.
Condensation
or ice forms
inside the unit.
• 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?
• Seal liquid foods with wrap.
• Put in foods after they have cooled down.
• Don't open the door too often and close it
firmly.
Condensation
forms in the
Exterior Case.
• Check if the ambient temperature and humidity of
the surrounding air are high.
• Is there a gap in the door gasket?
• Wipe moisture with a dry cloth. It will
disappear in low temperature and humidity.
• Fill up the gap.
There is
abnormal noise.
• Is the unit positioned in a firm and even place?
• Adjust the Leveling Screw, and position the
refrigerator in a firm place.
• Remove the objects.
Food in the
Refrigerator
is frozen.
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.
REMEDY
• 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.
Door does not
close well.
• Check if the door gasket is dirty with an item like
juice.
• Is the refrigerator level?
• Is there too much food in the refrigerator?
Ice and foods
smell
unpleasant.
● Other
• Check if the inside of the unit is dirty.
• Are foods with a strong odor unwrapped?
• The unit smells of plastic.
• 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.
• 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.
possible problems:
Check if frost forms
in the freezer.
Not
defrosting
Check Components of
the defrosting circuit.
Check the
refrigeration system.
The system
is faulty.
Perform sealed
system repair.
Check the
Thermistor.
The operation of the
Thermistor is incorrect.
Replace the
Thermistor.
- 64 -
12-3 REFRIGERATION CYCLE
▼ Troubleshooting Chart
TEMPERATURE
OF THE
COMPRESSOR
STATE OF
THE UNIT
STATE OF THE
EVAPORATOR
PARTIAL
LEAKAGE
Freezer
compartment and
Refrigerator don't
cool normally.
Low flowing sound of
Refrigerant is heard
and frost forms in
inlet only.
A little higher than
ambient
temperature.
• Refrigerant level is low due
to a leak.
• Normal cooling is possible by
restoring the normal amount
of refrigerant and repairing
the leak.
COMPLETE
LEAKAGE
Freezer
compartment and
Refrigerator don't
cool normally.
Flowing sound of
refrigerant is not
heard and frost isn't
formed.
Equal to ambient
temperature.
• No discharging of
Refrigerant.
• Normal cooling is possible by
restoring the normal amount
of refrigerant and repairing
the leak.
PARTIAL
CLOG
Freezer
compartment and
Refrigerator don't
cool normally.
Flowing sound of
refrigerant is heard
and frost forms in
inlet only.
A little higher than
ambient
temperature.
• Normal discharging of the
refrigerant.
• The capillary tube is faulty.
WHOLE
CLOG
Freezer
compartment and
Refrigerator don't
cool.
Flowing sound of
refrigerant is not
heard and frost isn't
formed.
Equal to ambient
temperature.
• Normal discharging of the
Refrigerant.
Cooling operation
stops periodically.
Flowing sound of
refrigerant is not
heard and frost melts.
Lower than ambient • Cooling operation restarts
temperature.
when heating the inlet of the
capillary tube.
COMPRESSION
Freezer and
Refrigerator don't
cool.
Low flowing sound of
refrigerant is heard
and frost forms in
inlet only.
A little higher than
ambient
temperature.
• Low pressure at high side of
compressor due to low
refrigerant level.
NO COMPRESSION
No compressing
operation.
Equal to ambient
temperature.
• No pressure in the high
pressure part of the
compressor.
CAUSE
LEAKAGE
CLOGGED BY DUST
MOISTURE CLOG
DEFECTIVE
COMPRESSION
Flowing sound of
refrigerant is not
heard and there is
no frost.
REMARKS
12-3-1 Cleaning
There is no need for routine condenser cleaning in normal Home operating environments. If the environment is
particularly greasy or dusty, or there is significant pet traffic in the home, the condenser should be cleaned
every 2 to 3 months to ensure maximum efficiency.
If you need to clean the condenser:
● Remove
the mechanical cover.
a vacuum cleaner with a soft brush to clean the grille, the open areas behind the grille and the front
surface area of the condenser.
● Replace the mechanical cover.
● Use
- 65 -
12-3-2 SEALED SYSTEM DIAGNOSIS
“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?
Partial
None
Equalization
Test
Equalization
Test
Very Fast
Very Slow
Very Slow
Very Fast
Fast
Inefficient
Compressor
Partial
Restriction
Complete
Restriction
Condenser
Temperature
Cap Tube
Sound
Hotter than Normal
Faint
Room Temperature
None to Weak
Air/Low Side
Leak
Loss of Change
Compressor Not
Pumping
Trace of Oil
Yes
No
Leak
Undercharge
(The equalization test is trying to restart a compressor using a start kit after it has been operating.)
- 66 -
13. ICEMAKER OPERATING METHOD AND TROUBLE SHOOTING
13-1 Icemaker’s Basic Operating Method
Power On
Start Position
• Adjusts Ice Tray to Start Position with power on.
• Waits until water becomes ice.
For cold air circulation, Ice tray will be
on a slightly tilt one hour after
ice-making mode begins. Atilt ice tray
means icemaker’s normal operation.
Icemaking
Mode
Full Ice
Check
Ice Tray on a slightly tilt
• If water becomes ices in the ice tray, Ice-detecting
sensor check if the ice bin is full.
Full Ice?
Harvest
Mode
• Twist the ice tray to drop ice into the ICE BIN.
• Supply water to the ice tray by operating the solenoid
valve.
Fill
• To force water to supply to the ice tray, or check
icemaker’s condition press and hold the FILL Key for
about 3seconds.
In the test mode, The icemaker will run through 3
stages step by step
: Harvest
Fill water
Ice making
Test Mode
To reset the icemaker’s operation, set the power switch OFF position and back it to ON position.
Power
Switch
Ice Tray
Ice-detecting sensor
Icemaker Unit
- 67 -
13-2 ICE MAKER FUNCTIONS
13-2-1 Icemaking Mode
1. Icemaking Mode begins right after the ice tray fills with water.
2. Icemaker waits until water becomes ice in the ice tray.
Ice-detecting sensor checks if the ice bin is full every 2min.
13-2-2 Harvest Mode
At least in 110min, since icemaker begun icemaking mode, Icemaker starts to twist the ice tray to drop ices into the Ice bin.
(After installation, at least 1day is needed to make ices)
If the icemaker never drop ices to the ice bin though water becomes ices in the ice tray, check the real temperature of
compartment. (not temperature on display)
Icemaker needs below 0°F to drop ices to ice bin.
13-2-3 Fill/Park Position
Once the normal harvest mode has been completed, the water solenoid will be activated.
13-3 Trouble Shooting Ice & Water system Issues
13-3-1 Icemaker not making ice or not making enough ice (Environmental Diagnosis)
Icemaker can’t make ices itself. Basically, water, temperature and time are needed.
- Water : If no Water, then no Ice.
- Temperature : The compartment, where the icemaker is located, has to be at least 1°F so that icemaker dumps ices to
the bin.
- Time : At least 80 minutes must be passed to make one series of ices after water comes into icemaker.
Test Mode should not be carried out before checking below.
Not making ice
Water
Is Icemaker’s tray filled
with water or Ice?
Temperature
Yes
Is measured
temperature below 10°F
in the icemaker
compartment
Time
No
Check saddle valve.
1. Is saddle valve turned on?
2. Is the icemaker fill tube frozen?
Check the fill tube heater’s electrical
resistance.
3. Are water valve housings are connected properly?
Check all the water valve’
connection.
4. Water line kinked or damaged?
5. Is water filter too old?
1. Does cold air come out from air vent normally?
No
Check if Icing fan is working.
Check if multi duct is blocked.
Measure the temp. and Check gas leakage
2. Are the R & F room cold enough?
at the back.
3. Does icemaker compartment door close tightly?
Yes
How long has customer
waited for icemaker to
make ices?
No
1. At least 120min. must be passed to make ices after water comes into icemaker.
2. At least 24 hours must be passed to have ice bin full of ices. (not in case of
installation)
If the issue haven’t resolved yet, though you have checked all the items above, go to next step.
- 68 -
13-3-2 Icemaker not making ice or not making enough ice
(Icemaker Unit & Ice-detecting sensor Diagnosis)
Icemaker Unit and Ice-detecting sensor Diagnosis
The icemaker unit and Ice-detecting sensor is programmed to be diagnosed.
Follow the procedure step by step to check to see if icemaker and Ice-detecting sensor is working normally.
Icemaker Unit
Ice-detecting sensor
Fill Key
1st STEP (Icemaker Unit Diagnosis)
Press the fill key for about 3sec. If the icemaker runs 2 stages of harvest and filling water step by step, It means icemaker’s
mechanism is normal.
Caution : Be sure that the ice tray is not filled with water before pressing fill key.
- 69 -
2st STEP (Ice-detecting sensor Diagnosis)
1. Remove Ice bin from compartment
2. Close the left door
(Door switch pushed)
3. Wait for 3min.
4. Freezer door stays open
5. Push the refrigerator
button & lock button at the
same time.
If“ETY”is shown on the display after the procedure above, Ice-detecting sensor is normal.
If“FULL”is shown on the display after the procedure above, Ice-detecting sensor is abnormal.
ETY = empty
13-3-3 Icemaker not making ice or not making enough ice (Other Suspected Items)
Strongly suspect items below If the issue remains yet, though all the diagnosis for icemaker has been carried out.
- Cap duct bad sealing
- Defective thermal sensor in the icemaker compartment
- Not cold icemaker compartment area (sealed system)
13-3-4 Not Dispensing Ice
Clogged Ice In the Ice Bin (suspected items)
- Customer haven’t used ice dispenser over a week.
Resolution : the ices gets stuck if customer doesn’t use ice dispenser.
In this case, empty the ice bin and wait until the new ices are stacked in the ice bin.
- Temperature of icemaker compartment is not cold enough.
Resolution : Check ice fan, sealed system, cap duct, vent and other items related to temperature.
- Cap duct doesn’t seal the air properly.
Resolution : Possibly, warm air could get into the compartment and make ices get stuck. Replace the cap duct with
new one.
- In-door geared motor doesn’t work
Resolution : Change the in-door geared motor and test it.
- The water comes out of fill cup and the water get into the ice bin.
Resolution : The water pressure from shutoff valve is too high.
Recommend to use regulator to the customer and close the shutoff valve slightly.
Clogged Ices In the Chute (suspected items)
- Cap duct doesn’t seal the air properly.
Resolution : Possibly, warm air could get into the compartment and make ices get stuck. Replace the cap duct with
new one.
- 70 -
14. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM
14-1 FUNCTION
14-1-1 Function
1. When the appliance is plugged in, it is set to 37°F for Refrigerator and 0°F for freezer.
You can adjust the Refrigerator and the Freezer control temperature by pressing the ADJUST button.
2. When the power is initially applied or restored after a power failure, it is set to Control temperature Previously.
3. If you do not press any button after turning on the power, only CRUSH or CUBE Label that has been selected will be
turned on and all other LEDs on the display Panel will be turned off within 60 seconds. (Power Save Mode)
4. If you press a button, only CRUSH, CUBE label and Lock icon that has been selected will be turned on and all other
LEDs on the display Panel will be turned off within 20 seconds. (Power Save Mode)
5. If you do not want to use the Power Save Mode, you can change the Mode by pressing the ICE PLUS Button and
Freezer TEMP button simultaneously for more than 5 seconds.
14-1-2 How to Toggle the Display between °F & °C
1. The initial setting is °F and the display temperature mode can be changed from °F to °C or °C to °F by pressing and
holding the FRZ TEMP and the REF TEMP keys at the same time for over 5 seconds.
14-1-3 Lock function (dispenser and display button lock)
1. When the refrigerator is first turned on, the buttons are not locked.
“LOCK” is deactivated with no light on.
2. To lock the display, the dispenser, and the control panel, press
and hold the LOCK button for 3 seconds. “LOCK” is activated with
“Lock Icon” on.
3. The LOCK button is the only control feature that remains active
in the locked state. The buzzer sound, other control buttons,
and the dispenser are deactivated.
4. To release from the locked state, press and hold the LOCK
button again for 3 seconds.
5. If you don’t hold the Alarm/Lock button more than 3 seconds,
Alarm function will be changed and alarm for opened door will be
on/off same as alarm icon indicating.
Ex) In selecting
"LOCK"
Ex) In selecting
"LOCK" again
14-1-4 Filter condition display function
1. There is a replacement indicator light for the filter
cartridge on the dispenser.
2. Water filter needs replacement once six months or of
using water filter.
3. When the Water Filter Icon blinks, you must exchange
the filter.
4. After replacing the filter, press and hold the Light/Filter
button for more than 3 seconds.
After then water Filter icon turn off with reset status.
Classification
Filter Status
Display
- 71 -
In initial Power On
/ Filter RESET
Blinking
14-1-5 Ice Plus selection
1. Please select ice plus function for quick freezing.
2. When you press the ice plus button, the ice plus icon will be turned
on again.
3. Ice plus function automatically turns off after a fixed time passes.
4. If you want additional power save, you can turn on energy saving
(some heater off for anti-dew).
5. To turn on or off the energy saving function, press Ice plus/Energy
saving Button for more than 3 seconds.
6. We recommend using energy saving function when you go out for
quite a long time and are out of the rainy season.
14-1-6 Dispenser use selection
WATER PAD
ICE PAD
You can select water or ice by separated pad switch.
• When you press ice type button, ice type will be changed. (Crush or
Cube)
• Hold your cup in the dispenser for a few seconds after dispensing
ice or water to allow the last pieces of ice drops of water to fall into
the cup.
• When after initially establ ishing the water comes out, the water tank
inside fills and until at the time of quality the hour is caught.
14-1-7 CONTROL OF FREEZER FAN MOTOR
1. Freezer fan motor has high and standard speeds.
2. High speed is used at power-up, for Ultra Ice, and when refrigerator is overloaded.
Standard speeds is used for general purposes.
3. To improve cooling speed, the RPM of the freezer fan motor change from normal speed to high.
4. High speed (2700RPM) : Initial power on or load corresponding operation, Ultra Ice.
Normal speed (2400RPM) : General working conditions.
14-1-8 Cooling Fan Motor
1. The cooling fan is switched ON and OFF in conjunction with the compressor.
2. The cooling fan Motor has high and standard speeds. (When room temper rapture more high then 38°C speed is high)
3. The Failure sensing method is the same as in the fan motor of the freezing fan motor(refer to failure diagnosis function
table for failure display).
14-1-9 Ice Compartment Fan
1. The Icing Fan is controlled by the the sensor on the top of the ice compartment.
2. The Failure sensing method is the same as in the fan motor of the freezer
(refer to failure diagnosis function table for failure display)
14-1-10 Refrigeration room Fan Motor
1. The refrigeration room fan is switched ON and OFF in conjunction with the refrigeration room temperature.
2. The Failure sensing method is the same as in the fan motor of the freezing fan motor (refer to failure diagnosis function
table for failure display).
- 72 -
14-1-11 Ice PLUS
1.
2.
3.
4.
The purpose of this function is to intensify the cooling speed of freezer and to increase the amount of ice.
Whenever selection switch is pressed, selection/release, the Icon will turn ON or OFF.
If there is a power outage and the refrigerator is powered on again, Ice PLUS will be canceled.
To activate this function, press the Ice PLUS key and the Icon will turn ON. This function will remain activated for 24 hrs.
The first one hour the compressor, Freezer Fan and Icing Fan will be ON. The next 23 hours the Ice room will be
controlled at the lowest temperature. After 24 hours or if the Ice PLUS key is pressed again, the Ice room will return to its
previous temperature.
5. During the first hour :
(1) Compressor, Freezer Fan and Icing Fan run continuously.
(2) If a defrost cycle begins during the first 30 minutes of Ice Plus, the Ice PLUS cycle will complete its cycle after
defrosting has ended.
If the defrost cycle begins when Ice Plus has run for more than 30 minutes, Ice PLUS will run for 40 minutes after the
defrost is completed.
(3) If Ice PLUS is pressed during defrost, Ice Plus Icon is on but this function will start seven minutes after defrost is
completed and it shall operate for three hours.
(4) If Ice Plus is selected within seven minutes after compressor has stopped, the compressor (compressor delays
seven minutes) shall start after the balance of the delay time.
6. For the rest of the 23 hours, the Ice room will be controlled at the lowest temperature.
14-1-12 How to set the display mode and cancel it
1. With the refrigerator door open, keep pressing the Refrigerator Temp Button and ICE PLUS Button more than 5 seconds,
then it goes to the display mode with Special Beep Sound With Special Beep Sound.
2. Perform the same way again to cancel the display mode.
3. All Freezing unit will be turned off at display mode (Exceptions : Lamp, Display)
- 73 -
14-1-13 Defrosting (removing frost)
1. Defrosting starts each time the COMPRESSOR running time Betwee 7~50 hours.
2. For initial power on or for restoring power, defrosting starts when the compressor running time reaches 4 hours.
3. Defrosting stops if the sensor temperature reaches 46.4°F(8°C) or more. If the sensor doesn’t reach 46.4°F(8°C) in 1
hours, the defrost mode is malfunctioning. (Refer to the defect diagnosis function, 8-1-15.)
4. Defrosting won’t function if its sensor is defective (wires are cut or short circuited)
14-1-14 Defect Diagnosis Function
1.
2.
3.
4.
Automatic diagnosis makes servicing the refrigerator easy.
When a defect occurs, the buttons will not operate; but the tones. such as ding. will sound.
When the defect CODE removes the sign, it returns to normal operation (RESET).
The defect CODE shows on the Refrigerator and Freezer Display.
* Display check function:
If simultaneously pressing Ultra Ice button and freezing temperature adjustment button for a
second, display LCD graphics on. If releasing the button, the LCD graphic displays the previous
status.
You can check the error code Within 3-hour Period from initial error
14-1-15 Auto pantry
1. The temperature control will automatically start upon the selected Auto Pantry temperature control.
2. You can adjust the Pantry control with three different temperature ranges by pressing the Temp.Selector button.
- 74 -
15. EXPLODED VIEW & REPLACEMENT PARTS LIST
CASE PARTS (LMX28988**)
CAUTION: Use the part number to order part, not the position number.
603C
624E
603E
503E
626A
S03
624G
S11
503D
624C
503G
207B
402A
624A
409D
S01
158A
271B
103B
S01
501F
S11
S03
103A
B01
207A
S02
120A
402A
145A
501G
406D
610D
282G
120C
120B
405G
B01
329B
405E
S02
405C
410J
271D
405F
S10
500A
145B
405D
411A
404B
500H
405H
313A
405I
282F
262B
S11
405J
S14
B02
262H
249L
249T
302B
249M
105A
249G
B02
318A
317A
316A
249C
S14
249V
303A
314A
400A
406B
316B
106A
249G
300A
408A
406B
304A
249D
146G
312C
503F
404A
312A
310B
409E
405B
329A
158B
106A
309B
405H
329C
323B
420A
319A
405F
290A
410G
405C
315B
407A
315C
610C
319C
315A
S20
103C
315B
315C
S17
B04
332C
FREEZER PARTS
CAUTION: Use the part number to order part, not the position number.
131A
136B
251A
251B
203C
237C
136A
REFRIGERATOR PARTS
CAUTION: Use the part number to order part, not the position number.
141A
141A
141B
141C
141A
140A
142D
141B
141C
142B
142A
141B
141C
141D
154A
161B
151C
151A
151B
161C
146E
161A
162B
145D
162A
DOOR PARTS (LMX28988**)
CAUTION: Use the part number to order part, not the position number.
241K
241A
231B
233B
241C
233A
241B
231A
212G
235A
241K
B06
B06
241D
241G
241D
312B
241E
B06
243C
243D
B06
262C
619B
615A
243A
603B
244A
243B
244A
603C
262E
262C
267A
250A
201A
200A
249E
250F
203A
B06
250B
250B
249F
B06
249K
249J
212D
250A
249E
201B
250B
249F
250B
200B
250F
249K
203B
B06
B06
212D
249J
DISPENSER PARTS
CAUTION: Use the part number to order part, not the position number.
276A
276G
276F
275A
405A
276B
279A
279I
278D
279H
279J
402C
278C
501D
279B
279D
500C
281B
279E
501A
281A
279C
VALVE & WATER TUBE PARTS
CAUTION: Use the part number to order part, not the position number.
617A
625A
616G
616D
616G
623B
S31
616J
623B
616J
616F
627B
603C
616D
S31
S31
627A
619A
619E
603B
ICE MAKER & ICE BIN PARTS
CAUTION: Use the part number to order part, not the position number.
630J
607A
630J
612A
630F
630B
630C
600A
611A
630A
630H
606A
630D
630E
630Q
630G
P/No. MFL62188107
JUNE., 2011 Printed in Korea

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