LG LMC25780 Series User manual

MODEL : LMC25780**
COLOR : WESTERN BLACK(SB)
ILLUMINA(AL)
SUPER WHITE(SW)
REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

CONTENTS
- 2 -
SAFETY PRECAUTIONS ....................................................................................................................................................... 2
1. SPECIFICATIONS .............................................................................................................................................................. 3
2. PARTS IDENTIFICATION .................................................................................................................................................. 4
3. DISASSEMBLY ............................................................................................................................................................. 5-11
REMOVING AND REPLACING REFRIGERATOR DOORS ............................................................................................... 5
DOOR .............................................................................................................................................................................. 6-7
DOOR ALIGNMENT ........................................................................................................................................................... 7
LAMP .................................................................................................................................................................................. 8
MULTI DUCT ...................................................................................................................................................................... 8
MAIN PWB ........................................................................................................................................................................... 8
HOW TO REMOVE AND REINSTALL THE PULLOUT DRAWER ................................................................................ 9-10
TOP DRAWER................................................................................................................................................................... 11
BOTTOM DRAWER........................................................................................................................................................... 11
4. ADJUSTMENT ............................................................................................................................................................ 12-13
COMPRESSOR ................................................................................................................................................................ 12
TSD STARTER ................................................................................................................................................................. 12
OLP(OVERLOAD PROTECTOR) ..................................................................................................................................... 13
5. CIRCUIT DIAGRAM ......................................................................................................................................................... 14
6. TROUBLESHOOTING ................................................................................................................................................ 15-19
COMPRESSOR AND ELECTRIC COMPONENTS .......................................................................................................... 15
OTHER ELECTRICAL COMPONENTS............................................................................................................................. 16
SERVICE DIAGNOSIS CHART ........................................................................................................................................ 17
REFRIGERATION CYCLE .......................................................................................................................................... 18-19
7. OPERATION PRINCIPLE AND REPAIR METHOD OF ICEMAKER .......................................................................... 20-23
OPERATION PRINCIPLE ................................................................................................................................................. 20
ICE MAKER FUNCTIONS ........................................................................................................................................... 21-23
8. DESCRIPTION OF FUNCTION & CIRCUITS OF MICOM........................................................................................... 25-38
FUNCTION .................................................................................................................................................................. 24-28
9. PCB Picture .................................................................................................................................................................29-30
Main PCB .......................................................................................................................................................................... 29
Display PCB ...................................................................................................................................................................... 30
10. Troubleshooting with Error display ........................................................................................................................ 31-51
Freezer Sensor Error ....................................................................................................................................................31-32
Refrigerator Sensor Error ............................................................................................................................................. 33-34
Defrost Sensor Error .................................................................................................................................................... 35-36
Ice Maker Sensor Error ................................................................................................................................................ 37-38
Defrost Heater Error ..................................................................................................................................................... 39-43
Freezer Fan Error ......................................................................................................................................................... 44-46
Condenser Fan Error .................................................................................................................................................... 47-48
Communication Error(display LED off) ......................................................................................................................... 49-50
11. Troubleshooting Without Error Display ................................................................................................................. 51-58
Freezer Room Lamp does not work. .............................................................................................................................51-52
REFRIGERATOR Room LAMP does not work ............................................................................................................ 53-54
POOR COOLING in the refrigerator compartment ...................................................................................................... 55-56
OVER-COOLING in the refrigerator compartment ....................................................................................................... 57-58
12. Reference .................................................................................................................................................................. 59-61
TEST MODE and Removing TPA ......................................................................................................................................59
TEMPERATRUE CHART - FRZ AND ICING SENSOR .................................................................................................... 60
TEMPERATRUE CHART - REF AND DEF SENSOR ....................................................................................................... 61
13. EXPLODED VIEW & REPLACEMENT PARTS LIST ................................................................................................ 62-66
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.

1. SPECIFICATIONS
- 3 -
Opaque Drawer Type
Recipro
Fin Tube Type
Wire Condenser
R-134a (130 g)
ISO10 (280 ml)
SHEATH HEATER
60W (2EA)
60W (1EA)
VEGETABLE TRAY
COMPRESSOR
EVAPORATOR
CONDENSER
REFRIGERANT
LUBRICATING OIL
DEFROSTING DEVICE
REFRIGERATOR
FREEZER
LAMP
ITEMS SPECIFICATIONS
Side Rounded
35 3/4X 34 1/4X 69 3/4(WXDXH) 25cu.ft
324.18 (25cu.ft)
Fan Cooling
Micom Control
Full Automatic
Heater Defrost
Embossed Metal, VCM, Stainless
Bar
ABS Resin
Polyurethane Foam
DOOR DESIGN
DIMENSIONS (inches)
NET WEIGHT (pounds)
COOLING SYSTEM
TEMPERATURE CONTROL
DEFROSTING SYSTEM
DOOR FINISH
HANDLE TYPE
INNER CASE
INSULATION
ITEMS SPECIFICATIONS
Description LMC25780**
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
34 1/4 in.
31 1/4 in.
27 7/8 in.
46 1/2 in.
68 3/8 in.
69 3/4 in.
35 3/4 in.
39 1/4 in.
44 1/4 in.
DIMENSIONS
25 cu. ft

2. PARTS IDENTIFICATION
- 4 -
ADJUSTABLE REFRIGERATOR SHELVING
The refrigerator compartment shelves are adjustable to
allow flexibility for storage needs.
MODULAR DOOR BINS
Three interchangeable bins can be arranged to suit your
storage needs.
REMOVABLE ICE STORAGE BIN
The ice storage bin can be removed to fill ice
buckets,coolers,or pitchers.
INTERIOR LAMP
Digital Sensor Control
FIXED DOOR BIN
AUTOMATIC ICEMAKER
1
2
3
4
5
6
7
3
2
7
4
6
1
2
5

Removing Refrigerator Door
CAUTION : Before you begin, unplug the refrigerator. Remove food and bins from doors.
Left Door -FIG. 2
1. 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.
2. Disconnect door switch wire harness. Remove cover.
3. Disconnect the three wire harnesses (4). Remove the grounding screw (5).
4. Rotate hinge lever (6) counterclockwise. Lift top hinge (7) free of hinge lever latch (8).
CAUTION : When lifting hinge free of latch, be careful that door does not fall forward.
5. Place door, inside facing up, down onto a non-scratching surface.
Right Door -FIG. 3
1. Open door. Loosen top hinge cover screw (1). Lift up cover (2).
2. Disconnect door switch wire harness. Remove cover.
3. Disconnect wire harness (3).
4. Remove the grounding screw ( 4).
5. Rotate hinge lever (5) clockwise. Lift top hinge (6) free of hinge lever latch (7).
CAUTION : When lifting hinge free of latch, be careful that door does not fall forward.
6. Lift door up from middle hinge pin door.
7. Place door, inside facing up, down onto a non-scratching surface.
3. DISASSEMBLY
- 5 -
3-1 REMOVING AND REPLACING REFRIGERATOR DOORS
Figure 2 Figure 3

- 6 -
3-2 DOOR
Door Gasket Removal
1. Remove door frame cover
Starting at top of cover and working down, snap cover
out and away from 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 the spring
ends are in the door channel.
3) Push in clip until you hear it snap securely into place.
2. Insert gasket into channel
1) Snap gasket assembly into the door bracket.
<Inserting the Gasket Assembly into the Bracket Door>
4) Push in remaining clip until you hear it snap securely
into place.
Note : Make sure that no part of gasket bracket edge
protrudes from beneath door frame edge.
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 snap
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.
Figure 1
Frame Cover
Handle
Figure 4
Figure 5
Door
Frame
Correct
Correct
Incorrect
Incorrect
Figure 2
Door
Frame
Gasket
Bracket Clip
Gasket
Bracket
Flat Tip
Screwdriver
Figure 3
Spring
Gasket
Bracket Clip

- 7 -
3. Replace door frame cover
Starting at top of cover and working down, snap cover
back into door.
2) Press gasket into channels on the three remaining sides
of door.
Figure 6
Figure 8
Figure 7
3-3 DOOR ALIGNMENT
If the space between your doors is uneven, follow the
instructions below to align the doors:
1. With one hand, lift 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 the product.)

- 8 -
Figure 15
3-4 LAMP
Unplug Refrigerator, or disconnect power at the circuit
breaker.
If necessary, remove top shelf or shelves.
1. Using a flat instrument, gently pry the lamp cover loose
in the front as shown. Rotate downward to remove rear
tabs.
2. Make sure the bulbs are cool to the touch. Turn bulbs
counterclockwise to remove. Insert new bulb(s).
3. Replace with a new 60-watt appliance bulb.
4. Assemble in reverse order by snapping the Lamp Cover
in, engaging the rear tabs followed by the front tabs.
3-4-1 Refrigerator Compartment Lamp
1. Unplug refrigerator power cord form outlet.
2. Remove screw with driver.
3. Grasp the cover Lamp, pull the cover downward.
3-4-2 Freezer Compartment Lamp
3-5 MULTI DUCT
1. Remove the upper and
lower Caps by using a
flat screwdriver, and
remove 2 screws.
(Figure 16)
2. Disconnect the lead wire
on the bottom position.
3-6 MAIN PWB
1) Loosen the 3 screws on the PWB cover.
Figure 16
2) Remove the PWB cover
3) Disconnect wire harness and replace the main PWB in
the reverse order of removal.

- 9 -
3-7 HOW TO REMOVE AND REINSTALL THE PULLOUT DRAWER
3-7-1 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 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.
Step 4) Lift the freezer door up to unhook it from the rail
support and remove.
Pull both rails to full extension.

- 10 -
3-7-2 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 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.
Step 3) Insert the rail into the left side gear, and insert the
gear into the clip.

- 11 -
3-8 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.
3-9 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.

- 12 -
4. ADJUSTMENT
C
M
SM
36
5S
N
L1
PTC
2
2
4-1-1 Role
4-1 COMPRESSOR
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 PTC-STARTER
4-2-3 PTC-Applied Circuit Diagram
Starting Method for the Motor
OVERLOAD PROTECTOR
COMPRESSOR
MOTOR
SEALED
TERMINAL
Resistance Starter Capacitor Running
PTC STARTER
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. Use only approved substitute parts.
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. Use only approved substitute parts.
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 performing repairs.
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. Dust, humidity, and solder flux
contaminate the cylinder and may cause noise, improper
operation or even cause it to lock up.
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 Compressor Motor.
(2) The compressor is a single-phase induction motor.
The starting operation, the PTC allows current flow to
both the start winding and main winding.

- 13 -
2
3
1
4-3-1 Definition of OLP
4-3 OLP (OVERLOAD PROTECTOR)
(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.
Figure 19
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.

- 14 -
5. CIRCUIT DIAGRAM

- 15 -
6. TROUBLESHOOTING
6-1 COMPRESSOR AND ELECTRIC COMPONENTS
1
2
3
4
5
YES
YES
NO
2
5
5
3
5
1
43
Power Source. Remove PTC-Starter
from Compressor and
measure voltage
between Terminal C of
Compressor and
Terminal 5 or 6 of PTC.
(Rated Voltage
±10%)?
Check
resistance of
Motor
Compressor.
Check resistance
between M-C, S-C and
M-S in Motor
Compressor.
Check
resistance of
PTC-Starter.
Check resistance of two
terminals in
PTC-Starter.
Replace
Compressor.
The range of resistance is between 1~50 (ok)
Open or short
No Voltage. OLP disconnected?
Applied voltage isn't in
acceptable range.
(115V ±10%)
Advise customer that power
supply needs to be checked
by an electrician.
Reference Page12.
Check OLP. Check resistance of two
terminals in OLP. Reference Page12.
Check starting
state.
Check the power supply
under load.
(Compressor attempting
to re-start after being off
for 5 minutes).
Supply
voltage rating
with ±10%.
Did
compressor
start?
Compressor
is OK
Replace the
compressor
Replace OLP.
Check connection
condition.
Reconnect.
YES YES
NO
NO

- 16 -
6-2 OTHER ELECTRICAL COMPONENTS
Not cooling at all
Poor cooling performance
Compressor doesn't
run.
Compressor runs
poorly. Check starting voltage. Low voltage. Advise customer that the Power supply
needs to be checked
by an electrician.
Fan motor doesn't run. Check wiring circuit. Wire is open or
shorted.
Check Fan Motor. Coil is shorted
or open.
Replace indicated
component.
Check current flow in
the Defrost Heater. Open. Replace Defrost
Heater.
Heavy frost buildup on
EVAPORATOR.
Check current flow in
the following
components:
Sensor Fuse-M
Open. Replace indicated
component.
Check voltage at
starting devices.
Poor or broken or open
contact.
Check current flowing
in sub-coil of
Compressor.
Shorted.
Check rating of OLP. Lack of capacity.
Replace indicated
component.
Check for open short or
incorrect resistance readings
in the following components
a. Starting devices Short, open, or broken.
b. OLP Poor contact or shorted.
c. Compressor coil Coil open or shorted.
d. Wiring harness Poor contact or shorted.
Cause
Replace indicated
component.

- 17 -
6-4 SERVICE DIAGNOSIS CHART
COMPLAINT POINTS TO BE CHECKED REMEDY
No Cooling. •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.
•Plug into the outlet.
•Set the switch to ON.
•Replace the fuse.
•If the voltage is low, correct the wiring.
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.
•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.
Food in the
Refrigerator is
frozen.
•Is food placed in the cooling air outlet?
•Check if the control is set to colder position.
•Is the ambient temperature below 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?
•Are any unnecessary objects placed behind of the
unit?
•Check if the drip tray is not firmly attached.
•Check if the cover of the compressor enclosure in
the lower front side is taken out.
•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.
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?
•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.
Ice and foods
smell unpleasant.
•Check if the inside of the unit is dirty.
•Are foods with a strong odor unwrapped?
•The unit smells of plastic.
•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.
Other possible problems:
Check if frost forms in
the freezer.
Check the
refrigeration system.
Check the thermistor.
Not defrosting
The system
is faulty.
The operation of
the thermistor is
incorrect.
Check components of the
defrosting circuit.
Perform sealed
system repair.
Replace the thermistor.

- 18 -
6-5 REFRIGERATION CYCLE
Troubleshooting Chart
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.
LEAKAGE
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.
MOISTURE CLOG Cooling operation
stops periodically.
Flowing sound of
refrigerant is not
heard and frost melts.
Lower than ambient
temperature.
•Cooling operation restarts
when heating the inlet of the
capillary tube.
CLOGGED BY DUST
COMP-
RESSION
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 COMP-
RESSION
No compressing
operation.
Flowing sound of
refrigerant is not
heard and there is
no frost.
Equal to ambient
temperature.
•No pressure in the high
pressure part of the
compressor.
DEFECTIVE
COMPRESSION
CAUSE REMARKS
STATE OF THE
EVAPORATOR
TEMPERATURE
OF THE
COMPRESSOR
STATE OF
THE UNIT

- 19 -
6-5-1 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
Equalization
Test
Very Slow
None
Equalization
Test
Very Fast
Fast
Very Fast
Inefficient
Compressor
Partial
Restriction
Complete
Restriction
Condenser
Temperature
Cap Tube
Sound
Yes
No
Air/Low Side
Leak
Loss of Change
Very Slow
Faint
Hotter than Normal
None to Weak
Room Temperature
Compressor Not
Pumping
Trace of Oil
Undercharge
(The equalization test is trying to restart a compressor using a start kit after it has been operating.)
Leak

- 20 -
7. ICE MAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR
7-1 Working Principles
7-1-1 Ice Maker Working Principles
Power Input
Initial Control
Ice Making
Control
Ice Ejection
Control
Water Supply
Control
Test Control
Level Ice Maker Cube Mould for “Initial Control”
after power is input.
Wait until the water in the cube mould is frozen
after ice maker starts operation.
Check ice bucket is full of ice by rotating ice ejection
motor in normal and reverse direction and eject ice into
the ice bucket if ice bucket is not full.
Conduct “Ice Making Control” after supplying water into the ice maker
cube mould by operating water valve.
This is for refrigerator assembly line and service. When “ice making test
switch” is pressed, it operates in the following steps: initial ice ejection
water supply control steps.
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.
Power
Switch
Automatic
Shut off Arm