LG WM8100 User manual

WASHING MACHINE
SERVICE MANUAL
Before servicing the washer, Read the safety precautions in the manual.
CAUTION
MODEL : WM8100
Any reproduction, duplication, distribution (including by way of email, facsimile or other electronic means),
publication, modification, copying or transmission of this Service Manual is STRICTLY PROHIBITED unless you
have obtained the prior written consent of the LG Electronics entity from which you received this Service
Manual. The material covered by this prohibition includes, without limitation, any text, graphics or logos in this
Service Manual.
Copyright © 2016 ~ 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

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CONTENTS
1. Specifications .............................................................................................................................................. 3
2. Features and Technical Explanation ........................................................................................................ 4-6
2-1. Featurs................................................................................................................................................. 4
2-2. Neuro fuzzy Washing time optimization ............................................................................................... 5
2-3. Water level Control............................................................................................................................... 5
2-4. Door Control......................................................................................................................................... 5
2-5. The door can not be Opened .............................................................................................................. 6
2-6. Door lock lamp Lights........................................................................................................................... 6
2-7. Child Lock ........................................................................................................................................... 6
2-8. Water Circulation.................................................................................................................................. 6
2-9. Steam................................................................................................................................................... 6
2-10 Drum Light .......................................................................................................................................... 6
3. Parts Identification....................................................................................................................................... 7
4. Installation and Test................................................................................................................................ 8-10
5. Operation................................................................................................................................................. 11-17
5-1. Control Panel Features ................................................................................................................ 11-13
5-2. Cycle Guide........................................................................................................................................ 14
5-3. Special Functions............................................................................................................................... 15
5-4. Explanation of Each Process ........................................................................................................ 16-17
6. Wiring Diagram............................................................................................................................................. 18
7. Test Mode ..................................................................................................................................................... 19
7-1. Safety Caution.................................................................................................................................... 19
7-2. Load Test Mode.................................................................................................................................. 19
7-3. How To Check the Water Level Frequency Error............................................................................... 19
8. Troubleshooting....................................................................................................................................... 20-33
8-1. Safety Caution.................................................................................................................................... 20
8-2. Error Mode Summary.................................................................................................................... 20-21
8-3. Troubleshooting With Error ........................................................................................................... 22-28
8-4. Other Troubleshooting................................................................................................................... 29-33
9. Component Testing Information............................................................................................................... 34-42
9-1. Filter Assembly (Line Filter)................................................................................................................ 34
9-2. Door Look Switch Assembly.......................................................................................................... 35-36
9-3. Stator Assembly ................................................................................................................................. 37
9-4. Pump Motor Assembly ....................................................................................................................... 38
9-5. Inlet Valve Assembly .......................................................................................................................... 39
9-6. Heater Assembly ................................................................................................................................ 40
9-7. Thermistor Assembly..................................................................................................................... 41-42
10. Disassembly Instructions....................................................................................................................... 43-51
11. Exploded View ....................................................................................................................................... 52-54
11-1. Cabinet and Control Panel Assembly............................................................................................... 52
11-2. Drum and Tub Assembly .................................................................................................................. 53
11-3. Dispenser Assembly......................................................................................................................... 54
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reserved. Only training and service purposes.

3
1. SPECIFICATIONS
ITEM WM8100
COLOR W : White, V : Stainless Silver(VCM)
POWER SUPPLY AC 120 V, 60 Hz
PRODUCT WEIGHT 225 lb (102 kg)
ELECTRIC POWER
CONSUMPTION
WASHING 280 W
DRAIN MOTOR 80 W
WASH HEATER 1000 W
REVOLUTION
SPEED
WASH 46 rpm
SPIN 0-1,400rpm
CYCLES 14
WASH/RINSE TEMPERATURES 5
SPIN SPEEDS 5
OPTIONS
STEAM, DELAY WASH, ADD GARMENTS, COLD WASH™
EXTRA RINSE, CHILD LOCK, DRUM LIGHT, FRESH CARE
PRE-WASH,TURBO WASH
™, RINSE+SPIN
WATER CIRCULATION Incorporated
OPERATIONAL WATER PRESSURE 20-120 psi (138-827 kPa)
CONTROL TYPE Electronic
WASH CAPACITY [cu.ft.] 5.23 DOE
DIMENSIONS 29”(W) X 32”(D) X 40 3/4”(H), 571/2” (D with door open)
DELAY WASH up to 19 hours
DOOR SWITCH TYPE PTC + Solenoid
DOOR FRAME CHROME
WATER LEVEL 10 steps (by sensor)
LAUNDRY LOAD SENSING Incorporated
ERROR DIAGNOSIS Incorporated
AUTO POWER OFF Incorporated
CHILD LOCK Incorporated
STEAM Incorporated
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reserved. Only training and service purposes.

4
2-1. FEATURES
2. FEATURES & TECHNICAL EXPLANATION
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reserved. Only training and service purposes.

5
2-2. NEURO FUZZY WASHING TIME OPTIMIZATION
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reserved. Only training and service purposes.

6
2-5. THE DOOR CAN NOT BE OPENED
●While program is operating.
●During a power failure or if the machine is unplugged while running.
●While door Lock lights turn on.
●Wile the drum is still turning, even if the machine has been stopped or paused.
2-6. DOOR LOCKED LAMP LIGHTS
● When the frequency of water level is lower than 22.9 kHz.
(It can be canceled when the frequency is more than 23.8 kHz.)
● When the temperature inside the tub is higher than 45°C (113° F) and water level is not 25.5 kHz.
(It can be canceled when the water level is 25.5 kHz or the temperature inside the tub is lower than 40° C (104° F))
2-7. CHILD LOCK
● Use this option to prevent unwanted use of the washer. Press and hold RINSE+SPIN button for 3
seconds to lock/unlock control.
● When child lock is set, CHILD LOCK lights and all buttons are disabled except the POWER
butt on. You can lock the controls of the washer while washing.
● CHILD LOCK remains in effect after the cycle and even if the power is turned off. To UNLOCK,
press and hold the STAIN CARE button for 3 seconds.
2-8. WATER CIRCULATION
●The recirculated water sprays from a nozzle at the Slightly below the center of both sides of the door gasket.
●During the wash cycle, it runs continuously for the first three minutes and intermittently after that.
●During the rinse cycle, it runs continuously after the drum is filled.
2-9. STEAM
●For tough stained clothes, sick room linens, or baby clothes.
● Steam Wash is available withCotton/Normal, Jumbo wash, Heavy duty, Bulky/Large, Bright whites™, Sanitary,
Allergiene™ and Tub clean.
●This option features upgraded washing performance with low energy and water consumption.
●Do not load delicates such as wool, silk, and easily discolored clothes.
2-10. DRUM LIGHT
●The drum light comes on when the power button is pressed.
●It goes off when the door is closed and the washer starts operation.
●The drum light remains off when the door is locked.
●The drum light can be turned on while the washer is in operation by pressing the Extra Rinse button for 3 seconds.
●The light will turn off automatically 4 minutes later.
●The drum light comes on when the washing cycle is finished and goes off 4 minutes later.
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reserved. Only training and service purposes.

7
3. PARTS IDENTIFICATION
INCLUED O
PTIONAL
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reserved. Only training and service purposes.

8
4. INSTALLATION & TEST
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reserved. Only training and service purposes.

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10
Power Start/Pause
Wash Temp.
Start/Pause
Start/Pause
Spin Speed
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reserved. Only training and service purposes.

11
5-1. Control Panel Features
5. OPERATION
WM8100
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reserved. Only training and service purposes.

12
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reserved. Only training and service purposes.

13
Spin Speed
Soil Level
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reserved. Only training and service purposes.

14
5-2. Cycle Guide
Cycle Guide
The cycle guide below shows the options and recommended fabric types for each cycle.
●= Available option
CYCLE FABRIC TYPE
DISPLAY
TIME(MIN)
BASIC OPTION (=DEFAULT) ADDITIONAL OPTIONS
Wash
Temp.
Spin
Speed
Soil
Level
Steam Cold
Wash™
Delay
Wash
Extra
Rinse
Pre
Wash
Turbo
Wash™
Allergiene™ Cotton, underwear,
pillow covers,
bed sheets, baby
wear
103~138 -Extra High
High★
Medium
Low
No Spin
-
  
Sanitary Heavily soiled
underwear, work
clothes, diapers,
etc.
116~129
Extra Hot
★Extra High
High★
Medium
Low
No Spin
Heavy
Normal
★
Light 
Bright
Whites
™
White Fabrics 72~85 Hot★
Warm
Cold
Tap Cold
Extra High
High★
Medium
Low
No Spin
Heavy
Normal
★
Light  
Bulky/Large Large items such as
blankets and
comforters
84 Hot
Warm★
Cold
Tap Cold
Medium★
Low
No Spin
Heavy
Normal
★
Light 
Heavy Duty Heavy soiled Cotton
Fabrics 91~132 Extra Hot Hot
Warm

Cold
Tap Cold
Extra High★
High
Medium
Low
No Spin
Heavy★
Normal
Light 
Cotton/
Normal Cotton, linen, towels, shirts,
sheets, jeans,
mixed loads
26~53 Extra Hot
Hot
Warm★
Cold
Tap Cold
Extra High
High★
Medium
Low
Heavy
Normal★
Light 
Jumbo Wash Comforter 84 Hot
Warm★
Cold
Tap Cold
High★
Medium
Low
No Spin
Heavy
Normal
★
Light 
Towels Towels 61~74 Hot
Warm★
Cold
Tap Cold
Extra High★
High
Medium
Low
No Spin
Heavy
Normal★
Light

Perm.Press Dress shirts/pants,
wrinkle-free
clothing, poly/
cotton blend
clothing,
tablecloths
37~47 Hot
Warm★
Cold
Tap Cold
High
Medium★
Low
Heavy
Normal★
Light

Hand Wash/
Wool Items labeled “hand-washable” 55 Warm★
Cold
Tap Cold
Low★
No Spin Normal★
Light  
Delicates Dress shirts/
blouses,
nylons, sheer or
lacy garments
41 Warm
Cold★
Tap Cold
Medium★
Low
No Spin
Heavy
Normal
★
Light 
Speed Wash Lightly soiled
clothing
and small loads
15 Hot★
Warm
Cold
Tap Cold
Extra High★
High
Medium
Low
No Spin
Heavy
Normal
Light★ 
Small Load Normally soiled
and small loads. 49~51 Hot Warm★
Cold
Tap Cold
Extra High
High
★
Medium
Low
No Spin
Heavy
Normal
★
Light 
Tub Clean This cycle is
designed to remove
a mildewy or musty
smell.
93~95
 
Cycle time depends on type and amount of load and detergent,water pressure and chosen additional options.
- If the Turbo Wash™ option is on, you cannot select “No Spin” as your Spin Speed.
(If the Turbo Wash™ option is off, you can select “No Spin” as your Spin Speed.)
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15
5-3. Special Functions
The option buttons also activate special functions,
including CHILD LOCK, DRUM LIGHT, FRESH CARE, and PGM SAVE.
Press and hold the option button marked with the special function for 3 seconds to activate.
Use this option to make laundry less stressful by intermittent tumbling action.
This option helps to reduce moisture in the load.
Press and hold the STEAM button for 3seconds to activate or deactivate FRESH CARE.
The drum is equipped with a white LED light that illuminates when the washer is turned on.
This light automatically turns off when the door is closed and the cycle starts.
To turn on the light during a cycle, press and hold the EXTRA RINSE button for 3 seconds.
The drum light will illuminate and then turn off automatically after 4 minutes.
Use this function to add garments or remove foreign objects like coins or keys after
the cycle has started.
1. Press Add Garments. The cycle pauses and the door unlocks.
2. Open the door, add garments or remove foreign objects, and close the door.
3. Press Start Button to restart the cycle. The cycle continues automatically.
Use this option to prevent unwanted use of the washer or to keep cycle settings from
being changed while the washer is operating. Press and hold the RINSE+SPIN button
for 3seconds to activate or deactivate CHILD LOCK. CHILD LOCK will be shown in
the display, and all controls are disabled except the ON/OFF button.
The washer can be locked during a cycle.
NOTE: CHILD LOCK lasts after the end of cycle. If you want to deactivate this function,
Press and hold the RINSE+SPIN button for 3 seconds.
FRESH CARE
CHILD LOCK
Add Garments
DRUM LIGHT
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16
5-4. Explanation of Each Process
PRE-WASH
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6. WIRING DIAGRAM / PROGRAM CHART
+HOUSING
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7. TEST MODE
7-1. SAFETY CAUTION
SPIN SPEED SOIL LEVEL
WASH/RINSE DELAY WASH
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20
8. TROUBLESHOOTING
8-1. SAFETY CAUTION
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