LG WM3677HW Installation guide

http://us.lgservice.com
WASHER/DRYER
COMBO
TRAINING MANUAL
CAUTION!
READ THIS MANUAL CAREFULLY
BEFORE DIAGNOSING OR SERVICING THIS PRODUCT.

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Published September 2005 by LG Technical Support Service

COMBO
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WM3677COMBO (Washer/Dryer)
Contents 3
Safety Notices and Warnings 4
OVERVIEW 5
Introduction 5
Specifications 6
Serial Numbers 7
Features 8
INSTALLATION 12
Preparation 12
Connections 13
Water 13
Electrical 13
Drain 13
OPERATION 14
Control Panel 14
Program Chart 15
Dispenser 16
TROUBLESHOOTING 18
Test Mode 18
Checking Water Level Frequency 18
Test Flow Chart 19
Error Codes 20
Diagnosis and Check List 22
DISASSEMBLY and REPAIR 35
Control Panel 35
Main PWB 36
Dispenser 37
Noise Filter 38
Front Cabinet Cover 39
Door and Door Lock Switch 41
Motor 42
Damper 44
Tub Removal and Repair 45
Water Level Switch 50
Pumps (Drain and Circulating) 51
Water Heater and Thermistor 52
Removal of Foreign Objects Between Tub and Drum 52
Ball Sensor (Unbalance switch) 53
Dryer Repair 55
Main PC Board 57
WIRING DIAGRAM 58
EXPLODED VIEWS 59
PARTS LIST 061130 63

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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.
DO NOT allow children to play in the COMBO drum. While the door latch is designed to open by only pulling,
the door can not be opened from the inside if the COMBO is turned on.
ESD NOTICE
Some of the electronic 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
Every effort has been made to create a training manual free from defects. In the event of corrections or
updates, the most current manual will be available online via LG CS Academy. (See page 2.)
COMPLIANCE
The responsible party for this device’s compliance is LG Electronics Alabama, Inc.; 201 James Record Road,
Huntsville, AL, 35824.

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INTRODUCTION
The 2005 lineup of LG Washers and Dryers includes the WM3677HW Combo.
The control panel is on the front of the machine.
The COMBO is different in that it has all the features of our regular washing
machine plus a condenser dryer built into the same housing. The washing
machine functions like our standard washer. The condenser dryer works by
condensing the moisture from the air circulating in the tub and expelling it via the
drain hose.
In simplest terms, the dryer fan blows air across a 1,000-watt electric warming
element and into the drum as the damp clothes tumble. Since warm air absorbs
more moisture than cold air, this air stream absorbs moisture from the clothing as
it passes though the drum. The moist air is then directed through the condensing
duct, where a fine mist of cold water keeps the duct cool. The moisture in the air
condenses and precipitates to the drain pump, where it is expelled through the
drain hose. This dried air is then blown across the warming element and the
cycle repeats itself.
Because the air is recirculated, no vent stack is necessary. This dryer takes
longer than a conventional dryer but allows both washing and drying in one
machine.
Drying time will likely be the most frequent complaint with the COMBO. When
used as a washing machine, the combo will wash a large load. However, when
used as a dryer, it will dry a load only half the size of the maximum wash load.
This is because the clothes need more room to tumble to allow the air to flow
through as they dry. Notice the dryers at the Laundromat®have twice the
capacity of the washers. Similarly, the LG dryer (DLG5988 ~ 7.3 cu. ft.) has twice
the capacity of the washer (WM2277HW ~ 3.7 cu. ft.). To use the drying function
effectively, the user must fill the COMBO no more than half full of laundry to dry
the load after washing. This is NOT a product defect.
The COMBO can be used as a washer only, or as a dryer only, in addition to
being able to both wash and dry clothes in just one cycle. To wash clothes
without drying, simply do not select a drying option. To dry clothes without
washing, press the ON button and DO NOT SELECT a wash cycle; instead,
press the DRY button to cycle through the dryer options. If you move the large
control knob and select a wash cycle, turn the machine off and back on, and then
choose a dry cycle as described above.

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SPECIFICATIONS
WM3766HW
White, Black, Titanium
3.22 cu. ft.t3
(
3.72 ft
3
IEC
)
Max. 11 lbs. (8 kg)
120 VAC, 60 Hz, 5 Amps
Washin
g
280 W
Drain Motor 80 W
Fan Motor 25 W
Dr
y
Heater 1,200 W
Wash Heater 1,000 W
Drum Speed Wash 42 rpm
Spin 0~1,200 rpm
4.5 - 145 psi (31 - 1000 kPa)
Direct Drive
Yes
5
7
27" W x 31" D (51" with door open) x 39" (H)
201 lbs.
9 hours
46 rpm
1,200 rpm
Yes
Energy
Consumption
Water Pressure
Motor
COMBO
Color
Dry Capacity
Power Supply
Spin Speed (Max. RPM)
Water Circulation
Wash Capacity
Weight
Delay Wash
Wash Speed
Water Heater
Temperature Settings
Cycle Programs
Size

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SERIAL NUMBER IDENTIFICATION
The serial number is unique to each product. It gives information concerning the
time and place of manufacture. The serial number is required to be paid for
warranty service and to get the correct part in the event a running production
change was made.
This chart will help you decode the serial number.

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KEY FEATURES
DIRECT DRIVE MOTOR
The advanced brushless DC motor drives the drum
directly without a belt or pulleys.
TILTED DRUM & LARGE DOOR
The 10° tilt and large door opening make it easy to load
and unload the combo.
WATER CIRCULATION
The detergent solution in the drum is recirculated and
sprayed repeatedly. The clothes are soaked more quickly
during the wash cycle. Suds are eliminated by the water
shower during the rinse cycle. The recirculation system
uses water and detergent more efficiently.
ROLLER JETS
The baffles in the drum include roller balls to enhance
washing performance and reduce wear on clothing. The
jets lift water and drizzle it throughout the wash load for
better fabric care.
AUTOMATIC LOAD DETECTION
The COMBO automatically detects the size of the wash
load and optimizes the washing performance via fuzzy
logic.
BUILT-IN HEATER
The internal heater automatically heats the water to the
optimum temperature on selected cycles.
CHILD LOCK
This feature keeps the kids from pressing buttons and
changing the settings during operation.

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FUZZY LOGIC
To get the best washing performance, the user selects one of the standard
cycles and sensors in the COMBO make an infinitely variable number of
adjustments as the cycle progresses. Adjustments are 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 puling it. When the machine is
operating, the electric latch keeps the door closed.
The door cannot be opened:
•When the COMBO 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 LOCKED LAMP
The DOOR LOCK lamp lights:
•When the COMBO 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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WATER CIRCULATION
The recirculation pump circulates the water during most of the cycle. During the
WASH cycle, it runs continuously for 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.
PARTS IDENTIFICATION
(Front of COMBO)

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(Back of COMBO)
The air vent must be left open and clear at all times. If the combo is 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 800 square inches of
open area for ventilation.
The COMBO requires a space of at least 1 inch between the wall and the
machine on each side and at least 4 inches between the back of the washer and
the wall. Additional space may be needed for servicing.
ACCESSORIES
The COMBO comes with the two input hoses. The blue stripe is for cold water
and the red stripe is for hot water. While the hoses are mechanically identical, it
is critical to the performance of the COMBO to have the hot and cold hoses
connected correctly.
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.
The shipping bolts MUST BE REMOVED before operating the COMBO.

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INSTALLATION
REMOVE THE SHIPPING BOLTS.
INSTALL THE COMBO ON A FIRM, FLAT SURFACE.
ADJUST THE FEET TO BE LEVEL.

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CONNECTIONS
WATER
Be sure the rubber washer is inside the hose end. Attach the hoses to the
COMBO (red is HOT, blue is COLD). Tighten them firmly but don’t strip the
plastic threads on the washer connections.
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, but there is no minimum height requirement. The hose can lay flat
into a floor drain as long as the end of it is not submerged.
ELECTRICAL
The COMBO requires 120 VAC, 60 Hz., on a dedicated 20-amp circuit.

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CONTROL PANEL
The control panel is located on the front of the COMBO.
All options are available from the control panel.

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PROGRAM CHART (WASHING)
This chart shows the components and their times of operation in the various
wash cycles. Remember that this time estimate is for the basic cycles before the
fuzzy logic adjustments are made.
The dryer can be set to dry for a specific time (30/60/90/120 minutes) or it can
use a sensor to determine when the clothes are dry.
BEFORE PERFORMING SERVICE
•Be careful to avoid electric shock when disconnecting parts for
troubleshooting.
•Most terminals in the COMBO have 120 VAC or DC on them.

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DETERGENT DISPENSER
The dispenser drawer is a multi-chambered reservoir that allows the user to add
all the appropriate laundry additives before starting the cycle. It has a place for
pre-wash detergent, main wash detergent, fabric softener, and bleach. Powdered
or liquid detergents may be used, but softener and bleach must be liquids.
Detergents should carry the HE designation. Do not use regular detergents in the
combo or oversudsing will occur.
The top of the dispenser box is shown here.
The dispenser works by using various solenoids to apply water to different
compartments. The liquid products are dispensed from a siphon box. As the
appropriate chamber is flooded, the box fills and the water flushes the laundry

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product into the tub. It is mixed with water before contacting the laundry to
prevent spotting or damaging the fabric.
Notice that the pre-wash and main wash fill tubes enter the dispenser at an angle.
If one or the other fill valve is opened, the water goes into the appropriate
detergent compartment. However, if they are opened simultaneously, the
streams deflect and dispense the softener. Some water may run through the
main and pre-wash compartments, but since the detergent has already been
dispensed in an earlier part of the cycle, this is of no consequence.
If liquid detergent is added to the pre-wash box, it will run immediately into the
tub. This doesn’t affect the operation of the cycle. To use liquid detergent in the
main wash, place the detergent siphon box in the main wash compartment.
Otherwise, the main wash liquid detergent will run into the tub along with the pre-
wash detergent, causing oversudsing in the pre-wash and no cleaning in the
main wash.
The siphon boxes are designed to hold a liquid laundry product until the
appropriate time for dispensing into the load. When the box fills with water, it
begins to discharge its contents into the washer fill stream. Once the siphon
action has started, it will continue until the siphon box has emptied itself. Use
only regular viscosity bleaches and softeners; the ultra versions are usually
thicker and do not dispense well, if at all.
By the end of any cycle, water will have run through all of the dispenser
compartments, preventing any cross-contamination of subsequent loads.

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TEST MODE
The COMBO must be empty and off to enter TEST MODE.
1. Press and hold the SPIN SPEED and SOIL LEVEL buttons.
2. Press the POWER button. The buzzer will sound twice.
3. Press START/PAUSE repeatedly to cycle through the test modes.
HOW TO CHECK THE WATER LEVEL FREQUENCY

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TEST OPERATION
Always test the COMBO for proper operation after installation and after any
repairs or adjustments are made. Use this flow chart.

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ERROR CODES
•If you press START/PAUSE when an error code is displayed, the error
code will disappear and the COMBO will go into PAUSE status.
(Exception: PE)
•In a case of PE, tE, or dE, if the error is not resolved within 20 seconds,
the COMBO will power OFF.
•In the case of any other error code, if the error is not resolved within
4 minutes, the COMBO will power OFF.
•In the case of FE, the COMBO will not power off.
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