LG WM2801H Series Installation guide

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IMPORTANT SAFETY NOTICE
The information in this training manual is intended for use by persons possessing an adequate background
in electrical equipment, electronic devices, and mechanical systems. In any attempt to repair a major
appliance, personal injury and property damage can result. The manufacturer or seller maintains no liability
for the interpretation of this information, nor can it assume any liability in conjunction with its use. When
servicing this product, under no circumstances should the original design be modified or altered without
permission from LG Electronics. Unauthorized modifications will not only void the warranty, but may lead
to property damage or user injury. If wires, screws, clips, straps, nuts, or washers used to complete a
ground path are removed for service, they must be returned to their original positions and properly
fastened.
CAUTION
To avoid personal injury, disconnect the power before servicing this product. If electrical power is required
for diagnosis or test purposes, disconnect the power immediately after performing the necessary checks.
Also be aware that many household appliances present a weight hazard. At least two people should be
involved in the installation or servicing of such devices. Failure to consider the weight of an appliance could
result in physical injury.
ESD NOTICE
Some of the electronic components in appliances are electrostatic discharge (ESD) sensitive. ESD can
weaken or damage the electronics in these appliances in a manner that renders them inoperative or
reduces the time until their next failure. Connect an ESD wrist strap to a ground connection point or
unpainted metal in the appliance. Alternatively, you can touch your finger repeatedly to a ground
connection point or unpainted metal in the appliance. Before removing a replacement part from its package,
touch the anti-static bag to a ground connection point or unpainted metal in the appliance. Handle the
electronic control assembly by its edges only. When repackaging a failed electronic control assembly in an
anti-static bag, observe these same precautions.
REGULATORY INFORMATION
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant
to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a residential installation. This equipment generates, uses,
and can radiate radio frequency energy, and, if not installed and used in accordance with the instruction
manual, may cause harmful interference to radio communications. However, there is no guarantee that
interference will not occur in a particular installation. If this equipment does cause harmful interference to
radio or television reception, which can be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of the following measures: Reorient or
relocate the receiving antenna; Increase the separation between the equipment and the receiver; Connect
the equipment to an outlet on a different circuit than that to which the receiver is connected; or consult
the dealer or an experienced radio/TV technician for help.
DISCLAIMER
The information in this training manual was accurate at the time of publication. Every effort has been made
to ensure accuracy. Updates, changes, etc. are available via GCSC and LGCSacademy. The information in
this manual is intended for persons with adequate backgrounds in electronics, mechanical, and electronic
servicing. The manufacturer and seller are not to be held responsible for any liability incurred from its use.
COMPLIANCE
The responsible party for this device’s compliance is LG Electronics Alabama, Inc.; P O Box 240007,
Huntsville, AL, 35813.

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WM2801H*A
SAFETY NOTICES (The Small Print Page) 1
Contents 2
Introduction 4
Specifications 4
Warranty 5
Features 6
Controls 7
Fuzzy Logic 8
Door Lock 8
Child Lock 9
Steam 9
Drum Light 9
Load Sensing 10
Water Circulation and Steam Spray 11
Parts Identification 12
Installation 13
Clearances
Stacking Kit 14
Makeup Air 15
Accessories 16
Shipping Bolts 17
Connections 18
Water 18
Drain 19
Electrical 19
Pedestal Kit 20
Control Panel 22
Before Performing Service (General Warnings and Recommendations) 24
Display 24
Program Chart 25
Cycle and Option Chart 26
Cycle and Option Information 27
Water Temperature Control 33
Detergent Dispenser 35
The Rule of TWOs (Detergent and Laundry Product Usage) 37
Direct Drive DC Motor 38
Disassembly and Repair 39
Block Wiring Diagram 40
Control Board (with connectors labeled) 41
Disassembly and Repair 42
Control Panel 42
Main Control Board 43
Dispenser 44

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Disassembly and Repair, continued
Noise Filter 45
Front Cover 45
Door and Hinge 47
Pumps and Filter Housing 48
Wash Heater 49
Foreign Object Removal 49
Water Level (Pressure) Switch 50
Motor 51
Tub and Drum 52
Dampers (Suspension) 53
Test Mode 54
Error Display 55
Error Codes 55
Troubleshooting Summary Sheet 56
Troubleshooting (with error codes) 57
Drain Error 57
Heating Error 58
Locked Motor Error 59
Door Open Error 60
Unbalance Error 61
Overflow Error 61
Pressure Sensor Error (Water Level Switch) 62
No Power 63
Buttons (Controls) Do Not Work 64
Vibration and Noise in Spin 65
Vibration Sensor Check 66
Detergent Does Not Dispense 67
Softener / Bleach Do Not Dispense 68
Component Test Procedures 69
Noise Filter 69
Door Lock 70
Stator 72
Hall Sensor 73
Pump Motors 78
Inlet Valve Assembly 81
Heater Driver Circuit 82
Steam Generator 84
Thermistors 90
Drum Lamp 92
Vibration Sensor 93
Balance Ring 94
Tips and Tricks 95
Wiring Diagram 96
V1.1 090824

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Exploded Views 97
Parts List 100
Special Tools 104
Serial Number Identification 105
Supplementary Information 106
Notes 110
INTRODUCTION
The WM2801is a front-loader washer with the optional cycles of SteamFresh®,
Allergeine®, and Sanitary. The new features include the larger, square door, the balancing
ring, and the drum antivibration system.
SPECIFICATIONS

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WARRANTY
Warranty statements vary by product. Be sure to check the warranty that was included
with the product because that is the valid warranty. This warranty statement is generic
and is intended for instructional purposes only.

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FEATURES
ULTRA CAPACITY
The larger drum (4.0 cu. ft. IEC) allows higher head drop,
greater centrifugal force, and washing of larger and heavier
loads and oversized items (comforters, curtains, blankets,
etc.) There is less wrinkling and tangling of the laundry.
(See BULKY / LARGE, page 28.)
DIRECT DRIVE
The brushless DC motor drives the drum directly without
belts, pulleys, or transmissions. The maximum spin speed of
1,320 RPM extracts more water from the laundry, reducing
drying times.
TILTED DRUM / LARGE DOOR
The tilted drum (10°) and large door opening allow easier
loading and unloading.
STEAM WASHING / STEAMFRESH®
The steam feature works with the recirculating pump to
increase washing performance while maintaining low energy
and water usage.
STEAMFRESH®is not a wash cycle, but uses steam to remove
wrinkles from previously laundered dry clothes.
ROLLER JETS and BALLS
The baffles pick up water as the drum turns and allow it to
pour through the clothing as it tumbles. The rollers enhance
the washing performance while maintaining fabric care.
AUTOMATIC LOAD DETECTION
The microprocessor reads the current required to rotate and
stop the drum in order to determine the weight of the load.
(See additional information on page 10. )

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FEATURES, continued
BUILT-IN HEATER
The internal heater helps maintain the water at
its optimal temperature for selected cycles. The
SANITARY cycle kills most common germs and
bacteria. The ALLERGIENE cycle is not quite as hot but
kills most dust mites and other allergens in laundry.
(See additional information on page 28 and on pages
33 and 34.)
CHILD LOCK
This allows the user to lock the controls. Children then
cannot play with the buttons and disturb the wash
cycle. (See additional information on pages 9 and 23.)
CONTROLS
1. Power Button Turns the machine on or off.
2. Cycle Selector Selects the desired wash cycle.
3. Start / Pause Starts or pauses a cycle.
4. Steam Button Adds steam to available cycles.
5. Setting Override Buttons Allows overriding certain automatic settings
6. Delay Button Delays the start of the wash cycle.
7. LED Display Shows the estimated remaining time on the cycle.
8. Special Function Buttons Allows selection of optional functions.
See additional information on pages 27 ~32 in this training manual.

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FUZZY LOGIC
To get the best washing performance, the user selects one of the standard cycles.
Sensors in the WASHER make an infinitely variable number of adjustments as the cycle
progresses. Adjustments are automatically made for load size, incoming water
temperature, soil level, rinses required, and other variables.
DOOR LOCK
The door has an automatic, electrically operated lock system. When the machine is off or
paused, the door can be opened by pulling it. When the machine is operating, the
electric latch keeps the door closed. In the event of a power failure, the door lock system
will release after 5 minutes.
The door cannot be opened:
•When the WASHER is operating
•When the power failed or the washer is unplugged
(until the capacitor discharges and releases the lock)
•When the DOOR LOCK light is on
•When the drum is still turning
DOOR LOCK INDICATOR
The DOOR LOCK INDICATOR lights:
•When the WASHER is operating
•When the water level sensor frequency is lower than 22.9 kHz
•When the temperature inside the tub is over 45°C (113°F)

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CHILD LOCK
The CHILD LOCK feature prevents unwanted use of the washer. Press and hold the
PRE-WASH button for three seconds to lock or unlock the control panel. When the
CHILD LOCK is set, all controls except the CHILD LOCK button are disabled.
STEAM
The STEAM feature offers enhanced washing performance with lower water and energy
consumption. It is especially useful for highly soiled or stained clothing, baby clothes,
and sick room linens.
DRUM LIGHT
The LED drum light turns on when the POWER button is pressed. It remains off when the
door is locked, but can be turned on at any time during the cycle by pressing and holding
the RINSE+SPIN button. It will turn off automatically four minutes later.

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LOAD SENSING FUNCTION
In order to determine the size and weight of the load, the machine begins each cycle
by tumbling the load a few revolutions. It spins up to approximately 120 rpm for
approximately 6 seconds. (Speed and time may vary by model.)
Determining the
size and weight of
the load allows the
controller to
estimate the
amount of water
required to wash
and rinse the load.
The fuzzy logic
within the program
will make numerous
decisions during the
cycle, adding water,
desudsing, and
rinsing as deter-
mined necessary.

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WATER CIRCULATION and STEAM
The recirculation pump circulates the water during most of the cycle. During the WASH
cycle, it runs continuously for the first 3 minutes and then intermittently throughout the
cycle. During the RINSE cycle, it runs continuously as soon as the appropriate amount of
rinse water has been added. This recirculated water enters the drum at the top of the
door at a small shower head. This spray not only keeps the window and gasket clean, it
allows the clothes to be soaked with detergent or rinse water more quickly and can be
used to control an oversudsing event.
The recirculation pump is separate from
the drain pump, but they are attached
to opposite sides of the filter housing.
The steam is not pumped; it comes into
the washer drum under its own
pressure. When steam or the sanitary
cycle is used, the door will remain
locked until the laundry has cooled to a
safe temperature.
The pumps and filter are located at the
bottom left front corner. The filter can
be unscrewed, cleaned, and replaced.
Use the small drain hose to evacuate
the water remaining in the bottom of
the tub before removing the filter.
The drain pump is on the left and
exhausts the water via the gray
corrugated hose.
The recirculating pump is on the right
and recirculates water from the sump to
the shower spray at the top of the door
gasket via the smaller black hose.
The filter is not a lint filter in the usual
sense of the term. Its function is to keep
debris out of the pump impellers.

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PARTS IDENTIFICATION
The air vent on the back of the machine must be left open and clear at all times.
If the washer and dryer are installed in a closet or closed laundry alcove, there must be
sufficient clearance and ventilation. The closet should have a full louvered door with at
least 650 square inches (0.5 m2) of open area for ventilation.
The washer requires a space of at least 1 inch (2.5 cm) between the wall and the
machine on each side and at least 4 inches (10 cm) between the back of the washer and
the wall. Additional space may be needed for servicing.
The following dimensional drawings show the space needed for various installations.

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INSTALLATION CLEARANCES
Dimensions with door open (side view.)
This would be the same if the dryer were
stacked on top of the washer.
Space in laundry alcove (front view.)
This would be the same if the dryer were
stacked on top of the washer.
Dimensions with laundry pair stacked.
The laundry pair can be stacked, but, if
installed on a pedestal, the dryer controls
would be 6½feet above the floor. It would
be very difficult to see the display or
operate the controls. (See following page
for information about stacking kits.)

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INSTALLATION (Stacking Kit)
WARNING! Do not attempt this alone! At least two people are required to lift the dryer
and place it properly on top of the washer. Failure to observe this warning could result in
serious physical injury and damage to the appliances.
Place the washer on a solid, even floor. If
you plan to use a pedestal, install it now
before going any further.
Peel the protective paper from the
adhesive tape on the side bracket.
Fit the side bracket firmly to the top plate
using the adhesive tape, as shown in the
drawing.
Secure the bracket to the top plate using a
screw, as shown.
Repeat these steps for the other side.
Level the dryer on a firm solid floor and
lock down the adjusters before placing it
on top of the washer.
Lift the dryer on top of the washer it
toward the front of the washer, as shown.
Slide the dryer all the way back to the stop
on the rail.

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INSTALLATION (Stacking Kit) continued
Install the front rail of the stacking kit. Push
the front rail back against the stops on the
side brackets.
Insert a screw to attach the front rail to the
side bracket.
Insert the other screw for the other side.
Tighten the leg down about half a turn to
put a little tension between the dryer and
the bracket to prevent rattling and
vibration.
INSTALLATION (Makeup Air)
Minimum clearances must be observed, particularly if the dryer is installed in a closet or a
laundry alcove. The dryer is essentially an air pump moving 150 cfm (cubic feet per
minute) and that air must come from somewhere for the dryer to operate properly.
Additional air must be supplied to support proper combustion for gas models.

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ACCESSORIES
The washer comes with the two input hoses. The blue stripe is for cold water and the red
stripe is for hot water. The hoses are not mechanically identical. It is critical to the
performance of the washer to have the hot and cold hoses connected correctly. The hot
hose is made of a thicker material suitable for higher temperatures and pressure.
The wrench is used to remove (and replace) the shipping bolts and to adjust the leveling
feet. Be sure to leave it and encourage the customer to retain the wrench, the four
shipping bolts, and the manual in a safe place in the event the washer requires service or
the customer moves. Your wrench may vary from the drawing; some wrenches may have
an extra hole in them for features in another market.
The shipping bolts MUST BE REMOVED before operating the washer. (See page 17.)
The wrench, shipping bolt hole covers,
drain hose tie-down strap, and a sample
packet of detergent are included in
a packet shipped inside the washer.
See page 35 concerning detergent usage.
Pay attention to the “RULE of TWOs” on
page 37.

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INSTALLATION
REMOVE THE SHIPPING BOLTS. LEAVE THEM WITH THE CUSTOMER.
The lower right bolt is equipped with a clip that secures the cord so it is impossible to
plug in the machine without removing the bolt. The cord is further secured by an
adhesive sticker which must be broken to free the cord to plug in the machine.
INSTALL THE WASHER ON A FIRM, FLAT SURFACE.
ADJUST THE FEET TO BE LEVEL. LOCK THE ADJUSTERS IN PLACE.

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CONNECTIONS
WATER
Be sure the rubber washer is inside the hose end. Attach the hoses to the washer
(red is HOT, blue is COLD). Tighten them firmly but don’t strip the plastic threads on
the washer connections. The hoses are clearly marked by temperature. The HOT hose is
thicker and has a higher temperature rating and burst strength. (See page 16.)

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DRAIN
The drain pipe should be firmly attached to the standpipe or the laundry tub or sink
where it drains. The pump has sufficient power to cause the pipe to move around when
the water is expelled. The pump can lift the drain water a maximum of 96 inches (2.4 m),
but there is no minimum height requirement. The vacuum breaker in the drain line will
prevent drainage by gravity or siphoning.
Some models may have a valve on the
vacuum break and the tub in place of the
hose that vents to the tub. The function is
unaffected. The hose can lay flat into a
floor drain as long as the end of it is not
submerged.
ELECTRICAL
The steam washer requires a 120 VAC, 60 Hz., dedicated, 20-amp circuit.

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INSTALLATION (PEDESTAL KIT)
This procedure covers installing and leveling the 7½” and 13” pedestals for 27” washers,
dryers, and combos. If the products are stacked, the washer must be below the dryer,
and only one pedestal is required. This will place the dryer controls approximately 6½
feet above the floor, making it difficult to see the display or operate the controls.
For 27” Pedestals
(Washer, Dryer, and Combo)
Remove the pedestal, installation hardware,
and instructions from the shipping
container.
(The style may vary among models.)
The pedestal kit includes:
1 drawer divider
1 wrench
4 retainers (dryer only)
18 screws (8 for dryer)
Level the pedestal on a solid, flat, level
floor. Lock down the rear adjusters, but
leave the front ones free for now.
Prepare the dryer for mounting. Retract all
four feet and lock down all four adjusters
on the dryer.
Note which holes are for the washer and
which are for the dryer. If you are stacking
the appliances, the washer should be on
the bottom.