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.

2
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
LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights
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
LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.

4
2-1. FEATURES
2. FEATURES & TECHNICAL EXPLANATION
LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.

5
2-2. NEURO FUZZY WASHING TIME OPTIMIZATION
LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights
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.
LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.

7
3. PARTS IDENTIFICATION
INCLUED O
PTIONAL
LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.

8
4. INSTALLATION & TEST
LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.

9
LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.

10
Power Start/Pause
Wash Temp.
Start/Pause
Start/Pause
Spin Speed
LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.