LG WTW1409HCW User manual

www.lg.com
OWNER'S MANUAL
WASHING
MACHINE
Before beginning installation, read these instructions carefully.
This will simplify installation and ensure that the product is
installed correctly and safely. Leave these instructions near the
product after installation for future reference.
AU ENGLISH
WTW1409HCW
MFL70439961
Rev.01_102918 Copyright © 2018 LG Electronics Inc. All Rights Reserved.

TABLE OF CONTENTS This manual may contain images or
content different from the model you
purchased.
This manual is subject to revision by the
manufacturer.
SAFETY INSTRUCTIONS .................................................................3
IMPORTANT SAFETY INSTRUCTIONS.................................................................3
INSTALLATION ..................................................................................8
Parts ........................................................................................................................8
Accessories .............................................................................................................8
Specifications ..........................................................................................................9
Installation Place Requirements ............................................................................10
Unpacking and Removing Transit Bolts................................................................. 11
Using Anti-Slip Sheets (Optional) ..........................................................................12
Wooden Floors (Suspended Floors)......................................................................12
Leveling the Appliance...........................................................................................13
Connecting the Water Supply Hose.......................................................................13
Installing the Drain Hose .......................................................................................16
OPERATION .....................................................................................17
Using the Washing Machine ..................................................................................17
Sorting Laundry .....................................................................................................18
Adding Cleaning Products .....................................................................................19
Control Panel.........................................................................................................22
Programme Table ..................................................................................................23
Option Programme ................................................................................................28
Dry ( ) ...............................................................................................................30
SMART FUNCTIONS .......................................................................32
Using LG SmartThinQ Application.........................................................................32
Using Smart Diagnosis™ ......................................................................................35
MAINTENANCE................................................................................36
Cleaning Your Washing Machine...........................................................................36
Cleaning the Water Inlet Filter ...............................................................................36
Cleaning the Drain Pump Filter .............................................................................37
Cleaning the Dispenser Drawer.............................................................................38
Tub Clean (Optional) .............................................................................................38
Caution on Freezing During Winter .......................................................................39
TROUBLESHOOTING .....................................................................41
Diagnosing Problems ............................................................................................41
Error Messages .....................................................................................................44

3
SAFETY INSTRUCTIONS AU
The following safety guidelines are intended to prevent
unforeseen risks or damage from unsafe or incorrect
operation of the appliance.
The guidelines are separated into ‘WARNING’ and ‘CAUTION’
as described below.
This symbol is displayed to indicate matters and
operations that can cause risk. Read the part with this
symbol carefully and follow the instructions in order to
avoid risk.
WARNING
This indicates that the failure to follow the instructions can
cause serious injury or death.
CAUTION
This indicates that the failure to follow the instructions can
cause the minor injury or damage to the product.
IMPORTANT SAFETY INSTRUCTIONS
WARNING
To reduce the risk of explosion, fire, death, electric shock,
injury or scalding to persons when using this product,
follow basic precautions, including the following:
Children in the Household
This appliance is not intended for use by persons (including
children) with reduced physical, sensory or mental capabilities, or
lack of experience and knowledge, unless they have been given
supervision or instruction concerning use of the appliance by a
person responsible for their safety. Children should be supervised
to ensure that they do not play with the appliance.

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Installation
•Never attempt to operate the appliance if it is damaged,
malfunctioning, partially disassembled, or has missing or broken
parts, including a damaged cord or plug.
•This appliance should only be transported by two or more people
holding the appliance securely.
•Do not install the appliance in a damp and dusty place. Do not
install or store the appliance in any outdoor area, or any area that
is subject to weathering conditions such as direct sunlight, wind,
or rain or temperatures below freezing.
•Tighten the drain hose at connecting ends to avoid separation.
•If the power cord is damaged or the hole of the outlet socket is
loose, do not use the power cord and contact an authorized
service centre.
•Do not use a multi outlet power board, extension cable or double
adapter with this appliance.
•This appliance must not be installed behind a lockable door, a
sliding door or a door with a hinge on the opposite side to that of
the appliance, in such a way that a full opening of the appliance
door is restricted.
•This appliance must be earthed / grounded via the mains supply
lead. In the event of malfunction or breakdown, grounding will
reduce the risk of electric shock by providing a path of least
resistance for electric current.
•This appliance is equipped with a power cord having an
equipment-earthing / grounding conductor (earthing pin) and a
grounding power plug. The power plug must be plugged into an
appropriate outlet socket that is installed and earthed / grounded
in accordance with all local codes and ordinances.
•Improper connection of the equipment-grounding conductor can
result in risk of electric shock. Check with a qualified electrician or
service personnel if you are in doubt as to whether the appliance
is properly grounded.
•Do not modify the power plug provided with the appliance. If it
does not fit the outlet, have a proper outlet installed by a qualified
electrician.

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•Do not modify the power plug provided with the appliance. If it
does not fit the outlet, have a proper outlet installed by a qualified
electrician.
•Do not lay the appliance completely when moving or installing the
appliance. It may cause noise or appliance damage.
Operation
•Do not attempt to separate any panels or disassemble the
appliance. Do not apply any sharp objects to the control panel in
order to operate the appliance.
•Do not repair or replace any part of the appliance. All repairs and
servicing must be performed by qualified service personnel unless
specifically recommended in this Owner’s Manual. Use only
authorized factory parts.
•Do not put animals, such as pets into the appliance.
•Keep the area underneath and around the appliance free of
combustible materials such as lint, paper, rags, chemicals, etc.
•Do not leave the appliance door open. Children may hang on the
door or crawl inside the appliance, causing damage or injury.
•Use a new hose or hose-set supplied with the appliance. Reusing
old hoses can cause a water leak and subsequent property
damage.
•Do not put in, wash or dry articles that have been cleaned in,
washed in, soaked in, or spotted with combustible or explosive
substances (such as waxes, wax removers, oil, paint, gasoline,
degreasers, drycleaning solvents, kerosene, petrol, spot removers,
turpentine, vegetable oil, cooking oil, acetone, alcohol, etc.).
Improper use can cause fire or explosion.
•Never reach into the appliance while it is operating. Wait until the
drum has completely stopped.
•In case of flood, disconnect the power plug and contact the LG
Electronics customer information centre.
•Do not push down on the door excessively, when the appliance
door is open.

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•Do not push down on the door excessively, when the appliance
door is open.
•Do not touch the door during a high temperature programme.
•Do not use flammable gas and combustible substances (benzene,
gasoline, thinner, petroleum, alcohol, etc.) near the appliance.
•If the drain hose or inlet hose is frozen during winter, use it only
after thawing.
•Keep all washing detergents, softener and bleach away from
children.
•Do not touch the power plug or the appliance controls with wet
hands.
•Do not bend the power cable excessively or place a heavy object
on it.
•Do not wash rugs, mats, shoes or pet blankets, or any other items
other than clothes or small sheets, in this machine.
•This appliance must only be used for domestic household
purposes and should not be used in mobile applications.
•If there is a gas leakage (isobutane, propane, natural gas, etc.),
do not touch the appliance or power plug and ventilate the area
immediately.
Technical Safety for Using the Dryer
•Do not dry unwashed items in the appliance.
•Items that have been soiled with substances such as cooking oil,
vegetable oil, acetone, alcohol, petroleum, kerosene, spot
removers, turpentine, waxes and wax removers should be washed
in hot water with an extra amount of detergent before being dried
in the appliance.
•Never stop the appliance before the end of the drying cycle unless
all items are quickly removed and spread out so that the heat is
dissipated.
•Items such as foam rubber (latex foam), shower caps, waterproof
textiles, rubber backed articles and clothes or pillows fitted with
foam rubber pads should not be dried in the appliance.

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•Fabric softeners, or similar products, should be used as specified
by the fabric softener instructions.
•Remove all objects from pockets such as lighters and matches.
•The appliance is not to be used if industrial chemicals have been
used for cleaning.
Maintenance
•Securely plug the power plug in the outlet socket after completely
removing any moisture and dust.
•Disconnect the appliance from the power supply before cleaning
the appliance. Setting the controls to the OFF or stand by position
does not disconnect this appliance from the power supply.
•Do not spray water inside or outside the appliance to clean it.
•Never unplug the appliance by pulling on the power cable. Always
grip the power plug firmly and pull straight out from the outlet
socket.
Disposal
•Before discarding an old appliance, unplug it. Cut off the cable
directly behind the appliance to prevent misuse.
•Dispose of all packaging materials (such as plastic bags and
styrofoam) away from children. The packaging materials can
cause suffocation.
•Remove the door before disposing of or discarding this appliance
to avoid the danger of children or small animals getting trapped
inside.
WARNING - To avoid a fire
•Do not wash clothes or items that have any contaminants
of flammable solvents or substances. Do not clean the
product or expose it to flammable substances.

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INSTALLATION AU
Parts
Transit bolts (x 4)
Power plug
Drawer
Control panel
Drum
Door
Drain hose
Drain tube
Drain pump filter
Cover cap (Location may
vary depending on products)
Adjustable feet (x 4)
1
2
3
4
5
6
7
8
9
10
11
Accessories
Cold supply hose (1
EA) (Option: Hot (1
EA))
Spanner Caps for covering
transit bolt holes
(Optional)
Anti–slip sheets (2 EA)
(Optional)
Elbow bracket for
securing drain hose
(Optional)
Tie strap (Optional)

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Specifications
Model WTW1409HCW
Wash Capacity 9 kg (Wash) / 5 kg (Dry)
Power Supply 220 - 240 V~, 50 Hz
Size 600 mm (W) x 610 mm (D) x 850 mm (H)
Product Weight 83 kg
Permissible Water pressure 100 ~ 800 kPa (1.0 - 8.0 kgf / cm²)
Allowable temperature 5 – 35 °C
•If the temperature is out of range of allowable temperature for installation, drying time is longer or
drying performance is pool.Appearance and specifications may change without notice to improve
the quality of the product.
•No further backflow protection required for connection to the water supply.
•Permissible cold water temperature : 4 - 25°C
•Specifications subject to change by manufacturer.
•Country of origin: Made In China
•Appearance and specifications may change without notice to improve the quality of the product.

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Installation Place
Requirements
Location
2 cm
4 cm
2 cm10 cm
Level floor : Allowable slope under the entire
appliance is 1°.
Mains Power outlet : Must be within 1 meter of
either side of the location of the appliance.
•Do not overload the outlet with more than one
appliance.
Additional Clearance : For the wall, 10 cm:
rear/2 cm: right & left side
•Do not place or store laundry products on top
of the appliance at any time. These products
may damage the finish or controls.
WARNING
•The plug must be plugged into an appropriate
outlet that is properly installed and grounded
in accordance with all local codes and
ordinances. Do not use or store this appliance
in any outdoor sheltered location. Avoid
installation where it will be exposed to direct
sunlight indoors.
Positioning
•Install the appliance on a flat hard floor.
•Make sure that air circulation around the
appliance is not impeded by carpets, rugs,
etc.
•Never try to correct any unevenness in the
floor with pieces of wood, cardboard or similar
materials under the appliance.
•If it is impossible to avoid positioning the
appliance next to a gas cooker or coal burning
stove, an insulation (85x60 cm) covered with
aluminum foil on the side facing the cooker or
stove must be inserted between the two
appliances.
•Do not install the appliance in rooms where
freezing temperatures may occur. Frozen
hoses may burst under pressure. The
reliability of the electronic control unit may be
impaired at temperatures below freezing point.
•Ensure that when the appliance is installed, it
is easily accessible for an engineer in the
event of a breakdown.
•With the appliance installed, adjust all four
feet using the transit bolt spanner provided to
ensure the appliance is stable, and a
clearance of approximately 40 mm is left
between the top of the appliance and the
underside of any worktop
•If the appliance is delivered in winter and
temperatures are below freezing, place the
appliance at room temperature for a few hours
before putting it into operation.
WARNING
•This equipment is not designed for maritime
use or for use in mobile installations such as
caravans, aircraft etc. It is not suitable for
commercial applications.
Electrical Connection
•Do not use an extension cord or double
adapter.
•Always unplug the appliance and turn off the
water supply after use.
•Connect the appliance to an earthed socket in
accordance with current wiring regulations.
•The appliance must be positioned so that the
plug is easily accessible.
•Repairs to the appliance must only be carried
out by qualified personnel. Repairs carried out
by inexperienced persons may cause injury or
serious malfunctioning. Contact your localan
authorised LG repairer.

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Unpacking and Removing
Transit Bolts
1Lift the appliance off the foam base.
•After removing the carton and shipping
material, lift the appliance off the foam
base. Make sure the tub support comes
off with the base and is not stuck to the
bottom of the appliance.
•If you must lay the appliance down to
remove the carton base, always protect
the side of the appliance and lay it
carefully on its side. Do not lay the
appliance on its front or back.
Tub Support
(Optional)
Carton base
2Remove the bolt assemblies.
•Starting with the bottom two transit bolts,
use the spanner (included) to fully loosen
all transit bolts by turning them
counterclockwise. Remove the bolt
assemblies by wiggling them slightly while
pulling them out.
Transit
bolt
Retainer
3Install the hole caps.
•Locate the hole caps included in the
accessory pack or attached on the back.
Cap
NOTE
•Save the bolt assemblies for future use. To
prevent damage to internal components, Do
not transport the washing machine without
reinstalling the transit bolts.
•Failure to remove transit bolts and retainers
may cause severe vibration and noise, which
can lead to permanent damage to the washing
machine. The cord is secured to the back of
the washing machine with a transit bolt to help
prevent operation with transit bolts in place.

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Using Anti-Slip Sheets
(Optional)
If you install the appliance on a slippery
surface, it may move because of excessive
vibration. Incorrect leveling may cause
malfunction through noise and vibration. If this
occurs, install the anti-slip sheets under the
leveling feet and adjust the level.
1Clean the floor to attach the anti-slip sheets.
•Use a dry rag to remove and clean foreign
objects and moisture. If moisture remains,
the anti-slip sheets may slip.
2Adjust the level after placing the appliance
in the installation area.
3Place the adhesive side of the anti-slip
sheets on the floor.
This side up
Adhesive side
4Ensure the appliance is level.
•Push or rock the top diagonal edges of
the appliance gently to make sure that the
appliance does not rock. If the appliance
rocks, level the appliance again.
NOTE
•You can obtain anti-slip sheets from an LG
Service Centre or a Hardware store.
Wooden Floors (Suspended
Floors)
•Wooden floors are particularly susceptible to
vibration.
•To help reduce vibration we recommend you
place rubber cups at least 15 mm thick of the
each foot of the appliance, secured to at least
two floor beams with screws.
Rubber Cup
•If possible install the appliance in one of the
corners of the room, where the floor is more
stable.
•Fit the rubber cups to reduce vibration.
NOTE
•Proper placement and leveling of the washing
machine will ensure long, regular, and reliable
operation.
•The washing machine must be 100%
horizontal and stand firmly in position.
•It must not ‘Seesaw’ across corners under the
load.
•The installation surface must be clean, free
from floor wax and other lubricant coatings.
•Do not let the feet of the washing machine get
wet. Failure to do so may cause vibration or
noise.
•You can obtain rubber cups
(p/no.4620ER4002B) from the LG Service
Centre.

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Leveling the Appliance
If the floor is uneven, turn the adjustable feet as
required (Do not insert pieces of wood etc.
under the feet). Make sure that all four feet are
stable and resting on the floor and then check
that the appliance is perfectly level (Use a spirit
level).
•Once the appliance is level, tighten the lock
nuts up towards the base of the appliance. All
lock nuts must be tightened.
Raise Lower
Lock nut
Tighten all 4
lock nuts securely
Diagonal Check
•When pushing down on the edges of the top
plate diagonally, the appliance should not
move up and down at all (check both
directions). If the appliance rocks when
pushing the machine top plate diagonally,
adjust the necessary foot or feet again.
NOTE
•Timber or suspended type flooring will
contribute to excessive vibration and
unbalance. Re enforcement or bracing of the
timber floor may need to be considered to
stop or reduce excessive noise and vibration.
•Do not install the washer on any elevated
surface, stand or plinth as it can become
unstable and fall causing serious injury and
damage.
Connecting the Water Supply
Hose
•Water pressure must be between 100 ~
800kPa (1.0‒8.0 kgf/cm2).
•Do not strip or crossthread when connecting
supply hose to the valve.
•If the water pressure is more than 800 kPa, a
pressure limiting device should be installed.
•Periodically check the condition of the hose
and replace the hose if necessary.
Checking the Rubber Seal on the
Water Supply Hose
Two rubber seals are supplied with each water
inlet hose. They are used for preventing water
leaks. Make sure the connection to taps is
sufficiently tight. Do not use any mechanical
device to overtighten the inlet hoses. Hand
tighten only with the aid of a soft cloth if
necessary. After both ends have been
connected, open the taps slowly and check for
leaks.
Hose connector
Rubber seal
Hose connector
Rubber seal

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Connecting Hose to Water Tap
(Methods below vary for each country)
Connecting Screw-Type Hose to a Tap
with a Thread.
Screw the hose connector onto the water
supply tap.
Connecting Screw-Type Hose to Tap
Without Thread
1Loose the four fixing screws.
Upper
connector
Rubber
seal
Fixing screw
2Remove the guide plate if the tap is too
large to fit the adapter.
Guide plate
3Push the adapter onto the end of the tap so
that the rubber seal forms a watertight
connection. Tighten the four fixing screws.
4Push the supply hose vertically upwards so
that the rubber seal within the hose can
adhere completely to the tap and then
tighten it by screwing it to the right.
Plate
Supply
hose
Connecting One Touch Type Hose to
Tap Without Thread
1Unscrew the adapter ring plate and loose
the four fixing screws.
Ring plate

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2Remove the guide plate if the tap is too
large to fit the adapter.
Guide plate
3Push the adapter onto the end of the tap so
that the rubber seal forms a watertight
connection. Tighten the four fixing screws
and the adapter ring plate.
4Pull the connector latch plate down, push
the supply hose onto the adapter, and
release the connector latch plate. Make
sure the adapter locks into place.
Latch plate
NOTE
•Before connecting the supply hose to the
water tap, turn on the water tap to flush out
foreign substances (dirt, sand, sawdust, and
etc.) in the water lines. Let the water drain into
a bucket, and check the water temperature.
Connecting Hose to Appliance
Attach the hot water line to the hot water supply
on the back of the washer. Attach the cold
water line to the cold water supply on the back
of the washer.
Cold water
supply
Hot water
supply
(optional)
NOTE
•After completing connection, if water leaks
from the hose, repeat the same steps. Use
the most conventional type of tap for the water
supply. In case the tap is square or too big,
remove the guide plate before inserting the
tap into the adaptor.
Using the Horizontal Tap
Horizontal tap
Extension tap
Square tap

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Installing the Drain Hose
•The drain hose should not be placed higher
than 100 cm above the floor. Water in the
appliance may not drain or may drain slowly.
•Securing the drain hose correctly will protect
the floor from damage in the event of water
leakage.
•If the drain hose is too long, do not force it
back into the appliance. This will cause
abnormal noise.
max. 100 cm
~ 100 cm
~ 145 cm
~ 105 cm
•When installing the drain hose to a sink,
secure it tightly with string.
•Securing the drain hose correctly will protect
the floor from damage in the event of water
leakage.
max. 100 cm
max. 100 cm
Laundry tub
Hose retainer
Tie strap

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OPERATION AU
Using the Washing Machine
Before the first wash, select a washing
programme, allow the washing machine to wash
without clothing. This will remove residue and
water from the drum that may have been left
during manufacturing.
1Sort laundry and load items.
•Sort laundry by fabric type, soil level,
colour and load size as needed. Open the
door and load items into the washing
machine.
2Add cleaning products and/or detergent and
softener.
•Add the proper amount of detergent with
the detergent measuring cup to the
washing drum evenly.
•Add the proper amount of detergent to the
detergent dispenser drawer. If desired,
add bleach or fabric softener to the
appropriate areas of the dispenser.
3Turn on the washing machine.
•Press the Power button to turn on the
washing machine.
4Choose the desired washing cycle.
•Turn the cycle selector knob until the
desired cycle is selected.
•Press the cycle button repeatedly until the
desired cycle is selected.
•Press the cycle button repeatedly or turn
the cycle selector knob until the desired
cycle is selected.
5Begin cycle.
•Press the Start/Pause button to begin the
cycle. The washing machine will agitate
briefly without water to measure the
weight of the load. If the Start/Pause
button is not pressed within 15 minutes,
the washing machine will shut off and all
settings will be lost.

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6End of cycle.
•When the cycle is finished, a melody will
sound. Immediately remove your clothing
from the washing machine to reduce
wrinkling. Check around the door seal
when removing the load for small items
that may be caught in the seal.
Sorting Laundry
1Look for the care label on your clothes.
•This will tell you about the fabric content
of your garment and how it should be
washed.
•Symbols on the care labels.
[Wash temperature]
[Normal machine wash]
[Permanent press]
[Delicate]
[Hand wash]
[Do not wash]
2Sorting laundry.
•To get the best results, sort clothes into
loads that can be washed with the same
wash cycle.
•Different fabrics need to be washed at
varying temperatures and spin speeds.
•Always sort dark colours from pale colours
and whites. Wash separately as dye and
lint transfer can occur causing
discolouration of white and pale garments.
Do not wash heavily soiled loads in this
Machine.
−Soil (Heavy, Normal, Light) :
Separate clothes according to amount of
soil.
−Colour (White, Lights, Darks):
Separate white fabrics from coloured
fabrics.
−Lint (Lint producers, Collectors):
Wash lint producers and lint collectors
separately.

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3Caring before loading.
•Combine large and small items in a load.
Load large items first.
•Large items should not be more than half
the total wash load. Do not wash single
items. This may cause an unbalanced
load. Add one or two similar items.
•Check all pockets to make sure that they
are empty. Items such as nails, hair clips,
matches, pens, coins and keys can
damage both your washing machine and
your clothes.
•Close zippers, hooks and strings to make
sure that these items don’t snag on other
clothes.
•Pre-treat dirt and stains by brushing a
small amount of detergent dissolved water
onto stains to help lift dirt.
•Check the folds of the flexible door gasket
and remove any small articles.
CAUTION
•Check inside the drum and remove any items
from a previous wash.
•Remove any clothing or items from the flexible
gasket to prevent clothing and gasket
damage.
Adding Cleaning Products
Detergent Dosage
•Detergent should be used according to the
instruction of the detergent manufacturer and
selected according to type, colour, soiling of
the fabric and washing temperature.
•If too much detergent is used, too many suds
can occur and this will result in poor washing
results or cause a malfunction or the motor to
overload.
•If you wish to use liquid detergent follow the
guidelines provided by the detergent
manufacturer.
•You can pour liquid detergent directly into the
main detergent drawer if you are starting the
cycle immediately.
•Do not use liquid detergent if you are using
Time delay, or if you have selected Pre Wash,
as the liquid may harden.
•If too many suds occur, reduce the detergent
amount.Drum type detergent must only be
used in Front loaders.excessive suds can be
caused by using the wrong type of detergent.
•When using a combined Front & Top loader
detergent,It is recommended to use only half
the quantity of detergent that is recommended
by the detergent manufacturer when washing
normally soiled loads.
•Detergent usage may need to be adjusted for
water temperature, water hardness, size and
soil level of the load. For best results, avoid
oversudsing.
•Refer to the label of the clothes, before
choosing the detergent and water
temperature.
•When using the washing machine, use
designated detergent for each type of clothing
only:
−General powdered detergents for all types of
fabric
−Powdered detergents for delicate fabric
−Liquid detergents for all types of fabric or
designated detergents only for wool
•For better washing performance and
whitening, use detergent with the general
powdered bleach.
•Detergent is flushed from the dispenser at the
beginning of the cycle.

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NOTE
•Do not let the detergent harden. Doing so may
lead to blockages, poor rinse performance or
odour.
•Full load : According to manufacturer’s
recommendation.
•Part load : 3/4 of the normal amount
•Minimum load : 1/2 of full load
Adding Detergent and Fabric
Softener
Adding Detergent
•Main wash only →
•Pre wash+Main wash →
NOTE
•Too much detergent, bleach or softener may
cause an overflow or a malfunction.
•Be sure to use the appropriate amount of
detergent.
Adding Fabric Softener
•Do not exceed the maximum fill line.
Overfilling can cause early dispensing of the
fabric softener, which may stain clothes. Close
the dispenser drawer slowly.
•Do not leave the fabric softener in the
detergent drawer for more than 2 days (Fabric
softener may harden).
•Softener will automatically be added during
the last rinse cycle.
•Do not open the drawer when water is being
supplied.
•Solvents (benzene, etc.) must not be used.
NOTE
•Do not pour fabric softener directly on the
clothes as it may stain the clothes.
Adding Water Softener
•A water softener, such as anti-limescale (e.g.
Calgon) can be used to cut down on the use
of detergent in extremely hard water areas.
Dispense according to the amount specified
on the packaging. First add detergent and
then the water softener.
•Use the quantity of detergent required for soft
water.