WT4870CW - LG Washing Machine Service Manual (repair manual)

Model
WT4870CW
Pages
53
Size
24.02 MB
Type
PDF
Document
Service Manual
Brand
Device
Washing Machine
File
wt4870cw.pdf
Date

View LG WT4870CW Service Manual online

WASHING MACHINE
SERVICE MANUAL
READ THIS MANUAL CAREFULLY TO DIAGNOSE
PROBLEMS CORRECTLY BEFORE SERVICING THE UNIT.
CAUTION
MODEL : WT4870C*
SAFETY PRECAUTION!
IMPORTANT SAFETY NOTICE!
2
This service information is intended for individuals possessing adequate backgrounds of 
electrical, electronic, and mechanical experience. Any attempt to repair this appliance may result 
in personal injury or property damage. The manufacturer or seller can not be responsible for the 
interpretation of this information, nor can it assume any liability in connection with its use.
   WARNING:
 
To reduce the risk of fire, electric shock, or personal injury when using this 
appliance, follow basic precautions, including the following:
·
 Wear gloves when working. 
Failure to do this can result in serious injury.
·
 The appliance is heavy. Two or more people are 
required  when moving the appliance. 
There is a risk of serious back injury or other injuries.
·
 Certain internal parts are intentionally not 
grounded and may present a risk of electric 
shock only during servicing. Service personnel - 
Do not contact the following parts while the 
appliance is energized: Pump bracket, rotor, and 
heater.
·
 Disconnect this appliance from the power  
supply before servicing. Turning the controls to 
the off position does not disconnect this 
appliance from the power supply.
   Failure to do this can result in shock.
·
 Reconnect all grounded devices after servicing. 
Failure to do this can result in shock.
CONTENTS
1. Specifications  ........................................... 3
2. Installation Instructions
2-1. How to Adjust Level  ...........................4
2-2. Connecting Water Supply Hose  ........ 6
2-3. Connect the Drain Hose  .................... 7
3. Operating Instructions
3-1. Identification of Parts  ........................ 8
3-2. Before Starting to Wash  .................... 9
3-3. Function of Each BUTTON   ............ 16
3-4. Washing Programs   ......................... 18
3-5. Care and Maintenance  .................... 19
4. Service Information
4-1. Disassembly Instruction  .................. 21
4-2. Wiring Diagram  ............................... 27
4-3. Test Running Without Water  ........... 28
4-4.  Troubleshooting By Common  
Washing Problems  .......................... 29
4-5. Troubleshooting Summary ................30
4-6. Troubleshooting with Error Code ......31
4-7. Other Troubleshooting ......................36
5. Component Testing Information ................38
5-1. Filter Assembly (Line Filter) ..............38
5-2. Door Lock Switch Assembly ..............39
5-3. Stator Assembly ................................41
5-4. Pump Motor Assembly ......................44
5-5. Inlet Valve Assembly .........................45
5-6. Thermistor Assembly .........................46
6. Exploded View  ........................................ 48
7. Replacement Part List  ............................ 52
1. SPECIFICATIONS
3
Model
WT4870C*
Electrical
Inner Tub
Stainless
Inlet Water Pressure
14.5 ~ 116 PSI (100 ~ 800 kPa)
Rating of Fuse
120V/60Hz
Spin Speed
1100±50 rpm
Weight
145.5 lbs (66kg)
Cycles
Cotton/Normal, Perm Press, Heavy Duty, Bulky/Bedding, 
Bright WhitesTM, Tub Clean, Speed Wash, Delicates
Time Delay
1 – 19 Hr
Lid Interlock Switch
Magnet Sensor
Control Lock
Yes
Softener Dispenser
Yes
Detergent Dispenser
Yes
Bleach Inlet
Yes
Auto Power Off
Yes
Smart Rinse™with Jet 
Spray
Yes
Heater
No
4
2. INSTALLATION INSTRUCTIONS
2-1. HOW TO ADJUST LEVEL
4
Raise
Lower
CAUTION
Raise
Lower
CAUTION
Raise
Lower
CAUTION
Raise
Lower
CAUTION
•  The ventilating openings in the base area must not be obstructed by carpeting.
•  Install the washing machine on a level and firm surface. There should be no more than 1° of variation.
•  Wooden floors may need reinforcing to prevent the normal vibration which occurs  
with an unbalanced load.
•  Do not install the washer on an inclined floor. 
Improper installation of the washer may cause noise and malfunctioning.
1
Installation area
•  
Install the washer on a firm, flat
 surface.
•  
If the washer is installed on an 
unsuitable floor, it could make 
considerable noise and vibrate.
2
3
Checking level
•   
Open the lid, check if the washer is 
correctly leveled by looking down 
from the top. If the tub is not 
centered in the opening, then the 
washer is not level.
WRONG
RIGHT
No shims. It would be dangerous. If the 
floor is that far from being level, it is a floor 
problem and not a washer problem. 
Set Leveling feet
•  
Adjust the leveling feet, Turn clockwise 
to raise the washer or 
counterclockwise to lower it.
Checking slope
•  
If installation surface is tilted, the 
washer will vibrate. Do not install 
on a sloping floor. 
5
28.
13
/
64
(72.1 cm)
4″
(10 cm)
55.
13
/
16
(141.7 cm)
(with lid 
open)
6
7
5
Confirming level
•  
Place the washer in original position, 
confirming the level.
Horizontal setting
•  If the washer is not level, adjust the  
leveling feet. Turn clockwise to raise, 
counterclockwise to lower.
Distance between the drain hose
and the wall
•  
Distance between the drain hose and 
the wall should be more than 4 inches 
(10 cm,) and the distance between any 
other part and the wall should be more 
than 1 inches (2.5 cm.)
  
 Do not install the washer in the following places.
• 
Where the washer is exposed to direct sunlight.
• 
Near a heater or heating appliance.
• 
Where the washer is exposed to freezing temperatures.
• 
In damp environments such as bathrooms or harmful environments.
Lower Raise
side to side
front to back
Water tap
Rubber Seal
Water Supply Hose
Cold water inlet
Hot water inlet
1
Be sure there is a gasket in both ends of the hose.
Push the water supply hose up so that the rubber packing
within the hose can adhere completely to the tap.
2
Connect the water supply hose to the tap.
Run a couple of gallons of water through the hoses into the drain or a
bucket to flush any particulate or contaminate.
3
Check water leakage.
After connecting the hose, open the tap to check for
any water leakage.
Connecting Water Supply Hose to the Machine
• Be sure there is a gasket in the end of the hose.
•  Connect the hose to the appropriate inlet vale 
(hot or cold) of the washing machine and tighten if 
firmly.
•  Turn on the water and check for leacks.
•  Always install new hoses with a new washing 
machine Do not re-use old hoses.
•  Relplace the hoses every five years.
Screw Type
2-2. CONNECTING WATER SUPPLY HOSE
6
Before connecting the water supply hose to the water tap, check the hose type and then choose the
correct instruction here below. 
7
2-3. CONNECT THE DRAIN HOSE
35"~47" (0.9~1.2m
)
35"~47" (0.9~1.2m
)
WARNING:
•  Connect the drain hose to the 
outlet of the drain pump located at 
the rear of the washing machine. 
Attach the clip to the drain hose. 
•   And then push it toward the body of 
the washing machine as indicated 
by the arrow.
•  Check that the drain hose is hung 
up over the edge of the laundry tub.
• Do not use an extension hose.
NOTE : 
•  
The drain hose should always be properly secured to the drain or standpipe. Failure to secure 
the drain hose properly can result in flooding and property damage.
             • The end of the drain hose should be placed 39" (99 cm) above the floor.
             • The drain must be installed in accordance with any applicable local codes and regulations.
             • Make sure that the water lines are not stretched, pinched, crushed, or kinked.
             •  Do not insert the drain hose more than 12” (30 cm) into the drain pipe to avoid siphoning and  
odor build-up.
Cable Tie
Cable Tie
35"~47" (0.9~1.2m
)
35"~47" (0.9~1.2m
)
WARNING:
•  The washer should never be installed or stored in a location subject to freezing temperatures. If the 
washer was exposed to freezing temperatures prior to installation, allow it to stand at room 
temperature for several hours before use. Damage to the water lines and internal mechanisms of 
the washer can result.
•  Water supply pressure must be between 14.5 psi and 116 psi (100 ~ 800kPa) If the water supply 
pressure is more than 116 psi, a pressure reducing valve must be installed. If you have 
uncontrolled water temperature and pressure you should fit a temperature and pressure relief valve 
to ensure that water temperature and water pressure remain within the safe limits. Consult a 
plumber or electrician if you are unable to adjust water temperature and or pressure. Failure to do 
so can result in damage to the machine.
•  Plug the power cord of washer into a properly grounded outlet. Failure to do this can result in shock 
or serious injury.
8
3. OPERATING INSTRUCTION
3-1. IDENTIFICATION OF PARTS
Powder detergent
Box for delayed
washing/softener additves box
InLet HoLe For
BLeACH
wASHIng wIng
(unique with lnner tub)
LeVeLLIng LegS
Use to level the washing
machine for correct balance
spin operation.
tUB
CoLd wAter SUPPLY
HoSe
Hot wAter SUPPLY
HoSe
Make sure the water
does not leak.
Power PLUg
If the supply cord is
damaged, it must be
replaced by the
manufacturer
or its service agents
or similarly qualified
person in order to
avoid a hazard.
FUnCtIon SeLeCtor
BASe
drAIn HoSe
Be sure the drain hose 
is properly installed on 
the drain before 
operating the washer. 
SMArt rInSe wItH 
Jet SPrAY
this washer is designed 
to save rinse water by 
using a jet spray rinse 
system in the normal/
Casual and Heavy duty 
cycles.
WIRE 
9
3-2. BEFORE STARTING TO WASH
Care Labels
•  Look for a care label on your clothes. 
This will tell you about the fabric content of your garment and how it should be washed. 
Sort clothes into loads that can be washed with the same wash cycle, water temperature,  
and spin speed.
Sorting
To get the best results, different fabrics need to be washed in different ways.
• SOIL (Heavy, Normal, Light)  
Separate clothes according to the type and amount of soil.
• COLOR (Whites, Lights, Darks) 
Separate white fabrics from colored fabrics.
• LINT (Lint producers, Collectors)  
Separate lint producers and lint collectors.
Lint Producers  
Terry cloth, Chenille, Towels, Diapers
Lint Collectors  
Synthetics, Corduroy, Permanent Press, Socks
Check before Loading
•  Check all pockets to make sure that they are empty. Things such as nails, hairclips, matches, 
pens, coins, and keys can damage both your washer and your clothes.
• Mend any torn garments or loose buttons. Tears or holes may become larger during washing.
• Remove belts, underwires, etc. to prevent damage to the machine or your clothes.
• Pretreat any dirt and stains.
• Make sure the clothes are washable in water.
•  Check the washing instructions.
• Remove any paper or tissue in the pockets. 
• Be sure the wire supports in undergarments are secure and will not become loose in the washer.
Loading
Do not wash fabrics containing flammable materials (waxes, cleaning fluids, etc.).
Load Size
The WATER LEVEL should just cover the clothes. Adjust the load size
accordingly. Loosely load clothes no higher than the top row of holes in the
washer tub. To add items after washer has started, press the START button and
submerge additional items. Close the lid and press the Start button again to restart.
 ※  
Do not wash waterproofed fabrics (such as skiing outfits, diapers, or nappy 
auto seat covers.)
Light and Large-sized clothing
Clothes like downs and woolens are lightweight, large, and float easily. Use a nylon net and
wash them in a small amount of water. If the laundry floats during the wash cycle, it may
become damaged. Use dissolved detergent to prevent the detergent from clumping.
 ※ 
Do not wash water-proof textilles (Skiing outfit, baby diaper, nappy automobile seat covers.)
Long laundry items
Use nylon bag nets for long, delicate items. For laundry with long strings or long length, a bag will prevent
tangling during washing. Fasten zippers, hooks, and strings to make sure that these items don't snag on
other clothes.
 ※ 
The nylon net bag can be purchased locally.
Pretreatment on stains or heavy soil
•  Pretreat shirt collars and cuffs with a pre-wash product or liquid detergent when placing them in the washer. 
Before washing treat special stains with bar soaps, liquid detergent, or a paste of water and powdered detergent.
•  Use a pretreat soil and stain remover. 
Treat stains AS SOON AS POSSIBLE. The longer they are left, the harder they are to remove. 
(For more detail refer to page 14-15)
10
1) Using Water
Water Temperature
•  The machine sets the appropriate temperature automatically according to the wash program . 
You can override the preset selection by pressing the water temperature icon. Touch the arrow buttons up or 
down until your desired temperature setting is displayed.
• The temperature of the water impacts the effectiveness of all laundry additives and, therefore, the cleaning results.
• We recommend temperatures of:
- HOT 120°F (120-140°F) 
White items, diapers, underclothing and heavily soiled, colorfast items.
- WARM 90°F (85-105°F)  
Most items
- COLD 66°F (65-75°F) 
Only very bright colors with light soil.
• When washing in COLD water additional steps may be needed:
- Adjust detergent amount and pre-dissolve detergent in WARM water
- Pretreat spots and stains
- Soak heavily soiled items
- Use appropriate bleach
*   Temperature below 18°C (65°F) will not activate laundry additives and may cause lint, residue, poor cleaning, etc. 
In addition, detergent manufactures and care labels define COLD water as 26~29°C (80-85°F). 
If the temperature of the water in the tub is too cold for your hands, the detergent will not activate and clean 
effectively.
Note
If iron is present in the water, the clothes may become an all-over yellow or they may be stained with brown or
orange spots or streaks. Iron is not always visible. Installation of water softener or an iron filter may be
necessary for severe cases.

Download LG WT4870CW Service Manual (Repair Manual)

Here you can view online and download LG WT4870CW Service Manual in PDF. WT4870CW service manual will guide through the process and help you recover, restore, fix, disassemble and repair LG WT4870CW Washing Machine. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.