Philips AC3829 User manual

© 2018 Koninklijke Philips N.V.
All rights reserved.
4241 210 95733
EN User manual 1
DA Brugervejledning 23
DE Benutzerhandbuch 45
ES Manual del usuario 71
FI Käyttöopas 94
FR Mode d’emploi 116
IT Manuale utente 140
NL Gebruiksaanwijzing 164
NO Brukerhåndbok 188
SV Användarhandbok 209
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Control buttons
Display panel
AC3829

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1EN
English
Contents
1 Important 2
Safety 2
2 You air purier 5
Product overview (g a) 6
Controls Overview (g b) 6
3 Get started 7
Installing the NanoProtect
lter 7
Preparing for humidication 7
Wi-Fi setup 8
4 Use the appliance 9
Understanding the air
quality light 9
Switching on and o 9
Setting the humidity level 9
Switching the operation
mode 10
Using the light on/o
function 10
Switching the display mode 10
Changing the Auto mode
setting 11
Changing the fan speed 11
Setting the timer 11
Setting the child lock 11
Water level 12
5 Cleaning 12
Cleaning schedule 12
Cleaning the body of the
appliance 13
Cleaning the air quality
sensor 13
Cleaning the water tank,
water tray and NanoCloud
rotary humidication wick 13
Cleaning the pre-lter 14
Descaling the NanoCloud
rotary humidication wick 14
6 Replace the lter and wick 15
Understanding the healthy
air protect lock 15
Replacing the NanoProtect
lter 15
Replacing the NanoCloud
rotary humidication wick 16
7 Troubleshooting 18
8 Guarantee and service 21
Order parts or accessories 21
9 Notices 21
Electromagnetic elds (EMF) 21
Recycling 22
Notice 22

2EN
1 Important
Safety
Read this user manual carefully before
you use the appliance, and save it for
future reference.
Danger
• Do not let water or any
other liquid or ammable
detergent enter the
appliance to avoid electric
shock and/or a re
hazard.
• Do not clean the
appliance with water,
any other liquid, or a
(ammable) detergent to
avoid electric shock and/
or a re hazard.
• Do not spray any
ammable materials
such as insecticides or
fragrance around the
appliance.
• The water in the water
tank is not suitable for
drinking. Do not drink this
water and do not use it to
feed animals or to water
plants. When you empty
the water tank, pour the
water down the drain.
Warning
• Check if the voltage
indicated on the
side of the appliance
corresponds to the local
power voltage before you
connect the appliance.
• If the power cord is
damaged, you must have
it replaced by Philips, a
service center authorized
by Philips, or similarly
qualied persons in order
to avoid a hazard.
• Do not use the appliance
if the plug, the power
cord, or the appliance
itself is damaged.
• This appliance can be
used by children aged
from 8 years and above
and persons with reduced
physical, sensory or
mental capabilities or
lack of experience and
knowledge if they have
been given supervision or
instruction concerning use
of the appliance in a safe
way and understand the
hazards involved.

3EN
English
• Cleaning and user
maintenance shall not be
made by children without
supervision.
• Children should be
supervised to ensure that
they do not play with the
appliance.
• Do not block the air inlet
and outlet, e.g. by placing
items on the air outlet or
in front of the air inlet.
• Standard WiFi interface
based on 802.11b/g/n at
2.4 GHz with a maximum
output power of 31.62 mW
EIRP.
Caution
• This appliance is not
a substitute for proper
ventilation, regular
vacuum cleaning, or use
of an extractor hood or
fan while cooking.
• If the power socket used
to power the appliance
has poor connections,
the plug of the appliance
becomes hot. Make
sure that you plug the
appliance into a properly
connected power socket.
• Always place and use the
appliance on a dry, stable,
level, and horizontal
surface.
• Leave at least 20cm free
space behind and on both
sides of the appliance
and leave at least 30cm
free space above the
appliance.
• Do not place anything on
top of the appliance.
• Do not place the
appliance directly below
an air conditioner to
prevent condensation
from dripping onto the
appliance.
• Make sure all lters
are properly installed
before you switch on the
appliance.
• Only use the original
Philips lters specially
intended for this
appliance. Do not use any
other lters.
• Avoid knocking against
the appliance (the air inlet
and outlet in particular)
with hard objects.

4EN
• Do not insert your ngers
or objects into the air
outlet or the air inlet to
prevent physical injury
or malfunctioning of the
appliance.
• Do not use this appliance
when you have used
indoor smoke-type insect
repellents or in places
with oily residues, burning
incense, or chemical
fumes.
• Do not use the appliance
near gas appliances,
heating devices or
replaces.
• Always unplug the
appliance after use
and before lling water,
cleaning, or carrying out
other maintenance.
• Do not use the appliance
in a room with major
temperature changes.
• To prevent interference,
place the appliance
at least 2m away from
electrical appliances that
use airborne radio waves
such as TVs, radios, and
radio-controlled clocks.
• When the appliance is
not used for a long time,
bacteria may grow on the
lters. Check the lters
after a long period of
disuse. If the lters are
very dirty, replace them
(see the chapter "Replace
the lter and wick").
• The appliance is only
intended for household
use under normal
operating conditions.
• Do not use the appliance
in wet surroundings or in
surroundings with high
ambient temperatures,
such as the bathroom,
toilet, or kitchen.
• The appliance does
not remove carbon
monoxide (CO) or
radon (Rn). It cannot be
used a safety device in
case of accidents with
combustion processes
and hazardous chemicals.
• Only ll the water tank
with cold tap water. Do
not use ground water or
hot water.
• Do not put any substance
other than water in the
water tank. Do not put
fragrance in the water
tank.

5EN
English
• If you do not use the
humidication function
for a long time, clean
the water tank and
NanoCloud rotary
humidication wick tray,
and air dry the NanoCloud
rotary humidication wick.
• If you need to move the
appliance, disconnect the
appliance from the power
supply rst. Then empty
or remove the water tank
and water tray. Carry the
appliance horizontally by
the handles on both sides
of the appliance.
• Unplug the appliance
during lling and cleaning.
2 You air purifier
Congratulations on your purchase, and
welcome to Philips!
To fully benet from the support that
Philips oers, register your product at
www.Philips.com/welcome.
The Philips air purier brings fresh,
humidied air to your house for the
health of your family. It oers you
advanced evaporation system with
NanoCloud technology, using a special
humidication lter which adds H2O
molecules to the dry air, and produces
healthy humid air without formation
of water mist. Its humidication lter
retains bacteria, calcium and other
particles from the water. It delivers only
pure humidied air in your home. No
more dry air in the winter season or
from the air conditioning.
Read this user manual carefully before
you use the appliance, and save it for
future reference.

6EN
Controls Overview
(g b)
Control buttons
Power on/o button
Child lock button
Auto mode button
Fan speed button
Humidity setting button
Light dimming button
2-in-1 mode on/o button
Timer/Reset button
Display panel:
Sleep mode
Auto mode
Allergen mode
Purication ONLY mode
2-in-1 mode
Filter replacement alert
Water rell alert
Pre-lter and wick cleaning alert
PM2.5 display
Indoor Allergen Index display
WiFi indicator
Product overview (g a)
AControl panel
BWater tank
CWick support
DWater tray
EOmni wheels
FWick wheel
GNanoCloud rotary humidication
wick (FY3435)
HBack side cover
IPre-lter
JNanoProtect lter Series 3
(FY2422)
KNanoProtect lter Active Carbon
(FY2420)
LAir outlet

7EN
English
Preparing for
humidication
1 Pull out the water tank (g j).
2 Lift the water tray upwards and pull
it out horizontally (g k).
3 Remove all packaging material
of the NanoCloud rotary
humidication wick (g l).
Note
• The humidication wick has been
assembled on the wick wheel upon
purchase.
4 Place the wick wheel on the wick
support (g m).
Note
• When placing the wick wheel on the
wick support, make sure that the
projections on the wick wheel falls
into the corresponding grooves.
5 Place the water tray back into the
appliance (g n).
6 Turn the top cap of the water tank
anti-clockwise to unscrew it
(g o).
7 Fill the water tank with cold tap
water (g p).
8 Turn the top cap clockwise to tightly
lock it onto the water tank (g q).
9 Place the water tank back into the
appliance (g r).
3 Get started
Installing the
NanoProtect lter
The appliance comes with the
NanoProtect lter tted inside. Remove
the packaging of the lter before using
the appliance place it back into the
appliance described as follows:
Note
• Make sure that the side with the tag
is pointing towards you.
1 Pull the top part of the back panel
towards you to release it from the
appliance (g c).
2 Press the two clips down and pull
the pre-lter towards you (g d).
3 Remove the NanoProtect lter from
the appliance (g e).
4 Remove all packaging materials of
the NanoProtect lter (g f).
5 Place the NanoProtect lter back
into the appliance (g g).
6 Put the pre-lter back into the
appliance, mount the pre-lter onto
the bottom of the appliance rst,
and then push the clips on the top
of pre-lter against the appliance
(g h).
7 To reattach the back cover, mount
the panel onto the bottom of the
appliance rst, and then push
the top of the panel against the
appliance (g i).

8EN
Wi-Fi setup
Setting up the Wi-Fi connection
for the rst time
1 Download and install the 'Air
Matters' app from the App Store or
Google Play.
2 Put the plug of the air purier in the
power socket and touch to turn
on the air purier.
»The Wi-Fi indicator blinks
orange for the rst time.
3 Make sure that your mobile device
is successfully connected to your
Wi-Fi network.
4 Launch the 'Air Matters' app and
click on the ‘+’ on the top right of
the screen. Follow the onscreen
instructions to connect the air
purier to your network.
5 After the successful pairing and
connection, the Wi-Fi indicator
will light up white. If pairing
is not successful, consult the
troubleshooting section, or the
help section in the 'Air Matters'
app for extensive and up-to-date
troubleshooting tips.
Note
• This instruction is only valid when
the air purier is being set up for
the rst time. If the network has
changed or the setup needs to be
performed again, consult section
“Setting up the Wi-Fi connection
when the network has changed” on
page 8.
• If you want to connect more than
one air purier to your smart device,
you have to do this successively.
Complete the set up of one air
purier before you turn on the other
air purier.
• Make sure that the distance
between your mobile device and
the air purier is less than 10 m
without any obstructions.
• This app supports the latest
versions of Android and iOS. Please
check www.philips.com/purier-
compatibility for the latest update
of supported operating systems and
devices.
Setting up the Wi-Fi connection
when the network has changed
Note
• This applies when the default
network to which your purier is
connected has changed.
1 Put the plug of the air purier in the
power socket and touch to turn
on the air purier.
2 Touch and simultaneously for
3 seconds until you hear a beep.
»The air purier goes to pairing
mode.
»The Wi-Fi indicator blinks
orange.
3 Follow the steps 4-5 in "Setting up
the Wi-Fi connection for the rst
time" section.

9EN
English
4 Use the
appliance
Understanding the air
quality light
IAI
level
Air quality
light color
Air quality
level
1-3 Blue Good
4-6 Blue-Purple Fair
7-9 Purple-Red Poor
10-12 Red Very poor
The air quality light automatically goes
on when the appliance is switched on,
and lights up all colors in sequence.
In a short time the air quality sensors
select the color that corresponds to the
ambient air quality.
Switching on and o
1 Put the plug in the power socket.
»The appliance beeps.
2 Touch to switch on the
appliance.
»The appliance operates under
the 2-in-1 mode by default with
displayed on the screen.
»When the appliance is warming
up, " " displays on the
screen. After measuring the
particulate matter only in the
air, the appliance shows the IAI
level and operates in the auto
mode by default.
»After measuring the air
quality for approximately
30 seconds, the air quality
sensor automatically selects
the appropriate air quality light
color.
3 Touch and hold for 3 seconds to
switch o the appliance.
Note
• After the appliance is switched
o by the on/o button , if the
plug is still in the power socket, the
appliance will operate under the
previous settings when it is switched
on again.
Setting the humidity
level
1 Touch the humidity button
repeatedly to set the desired air
humidity to 40%, 50%, 60% or " "
(g s).
Note
• When the humidity level " " is
chosen, the appliance will keep
humidifying the room until the
ambient humidity level reaches
70%RH.
• When the target humidity level is
reached, the wick wheel will stop
rotating. It will start rotating again
when the humidity drops below the
target level.
• If you want to increase the humidity
level quickly, you can select a
higher fan speed.

10 EN
Switching the display
mode
The appliance has three display modes,
PM2.5 display, IAI display and humidity
level display.
PM2.5
AeraSense sensing technology
accurately detects and quickly respond
to even the slightest particle change in
the air. It provides you with reassurance
with real-time PM2.5 feedback.
IAI
The professional-grade AeraSense
sensor detects the level of indoor air
allergen and with numerical feedback
from 1 to 12 the potential risk level of
indoor air allergens can be displayed.
1 indicates best air quality.
Note
• The appliance operates in IAI
display mode by default.
1 Touch and hold for 3 seconds to
switch to PM2.5 display (g u).
»PM2.5 indicator and the actual
PM2.5 level display on the
screen.
2 Touch and hold for 3 seconds
twice to switch to humidity level
display (g v).
3 Touch and hold for 3 seconds to
switch to IAI display (g w).
»IAI indicator and the actual IAI
level display on the screen.
Switching the operation
mode
The appliance has two operation
modes, the purication ONLY mode and
the 2-in-1 mode.
• Touch the mode selection button
repeatedly to switch between
the purication ONLY mode and the
2-in-1 mode (g t).
»displays on the screen when
the appliance operates in the
purication ONLY mode.
»displays on the screen when
the appliance operates in the
2-in-1 mode.
Using the light on/o
function
With the light dimming button, you can
switch on or o the air quality light,
the display screen and the function
indicator if desired.
1 Touch the light dimming button
once, the air quality light will be
dimmed.
2 Touch the light dimming button
again, the air quality light and the
display panel will be turned o.
3 Touch the light dimming button
for the third time, all lights will be on
again.

11EN
English
Changing the Auto mode
setting
You can choose the auto mode ( ),
the Allergen mode ( ) and the sleep
mode ( ).
Auto mode
In Auto mode, the appliance selects
the fan speed in accordance with the
ambient air humidity and air quality.
• Touch the fan speed button to
select Auto mode (g x).
»Auto ( ) and display on the
screen.
»The appliance operates in Auto
mode by default.
Allergen mode
The extra-sensitive Allergen mode
is designed to react to even a small
change in allergen levels in the
surrounding air.
• Touch the Auto mode button to
select the Allergen mode (g y).
»Auto ( ) and display on the
screen.
Sleep (SL)
In Sleep mode, the air purier operates
quietly on a very low speed.
• Touch the Auto mode button
select the Sleep mode ( ).
»Sleep ( ) and display on
the screen (Fig z).
Note
• If no buttons are touched after one
minute, all lights will go o except
.
• You can turn on the lights by
touching any buttons.
Changing the fan speed
There are several fan speeds available.
Manual
• Touch the fan speed button
repeatedly to select the desired fan
speed (1, 2or 3) (g {).
Turbo (t)
In Turbo mode, the air purier operates
on the highest speed.
• Touch the fan speed button to
select the Turbo mode ( ) (g |).
Setting the timer
With the timer, you can let the
appliance operate for a set number of
hours. When the set time has elapsed,
the appliance will automatically switch
o.
• Touch the Timer/Reset button
repeatedly to choose the number
of hours you want the appliance to
operate (g }).
»The timer is available from 1 to
12 hours.
• To deactivate the timer function,
touch the Timer/Reset button
repeatedly until "---" displays on
the screen.
Setting the child lock
1 Touch and hold the child lock
button for 3 seconds to activate
child lock (g ~).
»displays on the screen for
3 seconds.
»When the child lock is on,
all the other buttons are not
responsive.

12 EN
5 Cleaning
Note
• Always unplug the appliance before
cleaning.
• Never immerse the appliance in
water or any other liquid.
• Never use abrasive, aggressive, or
ammable cleaning agents such as
bleach or alcohol to clean any part
of the appliance.
• Only the pre-lter and NanoCloud
rotary humidication wick are
washable. The NanoProtect lter
is not washable nor vacuum
cleanable.
Cleaning schedule
Frequency Cleaning method
When
necessary
Wipe the surface of the
appliance with a soft
dry cloth.
Every week
Rinse the water tank,
the water tray and
the NanoCloud rotary
humidication wick.
When the
cleaning
icon
lights up
and F0
displays on
the screen.
Clean the pre-lter.
Descale the NanoCloud
rotary humidication
wick with the water and
white vinegar (5% acetic
acid) or water and citric
acid.
2 Touch and hold the child lock
button for 3 seconds again to
deactivate child lock (g ).
»displays on the screen for
3 seconds.
Water level
The water level in the water tank is
visible through the water level window
on the water tank.
When there is not enough water in
the water tank, the water rell light
ashes to indicate that you have to rell
the water tank (g €).
Note
• When there is no water in the
water tank, the wick wheel will stop
rotating. When the water tank is
relled with water, the wick wheel
will start rotating again.

13EN
English
Cleaning the body of the
appliance
Regularly clean the inside and outside
of the appliance to prevent dust from
collecting.
1 Wipe away dust with a soft dry cloth
from the body of the appliance.
2 Clean the air outlet with a soft dry
cloth.
Cleaning the air quality
sensor
Clean the air quality sensor every
2 months for optimal functioning of the
purier. Clean them more frequently
if you use the purier in a dusty
environment.
Note
• When the humidity level in the
room is very high, it is possible that
condensation develops on the air
quality sensor. As a result, the air
quality light may indicate that the
air quality is bad even though it is
good. In this case you have to clean
the air quality sensor or use one of
the manual speed settings.
1 Clean the air quality sensor inlet and
outlet with a soft brush (g ).
2 Open the air quality sensor cover
(g ‚).
3 Clean the air quality sensor, the
dust inlet and the dust outlet with a
lightly moistened cotton swab
(g ƒ).
4 Dry them with a dry cotton swab.
5 Reattach the air quality sensor cover
(g „).
Cleaning the water
tank, water tray and
NanoCloud rotary
humidication wick
Note
• Cleaning the water tank, water
tray and NanoCloud rotary
humidication wick every week to
keep them hygienic.
1 Pull out the water tank (g j).
2 Lift the water tray upwards and pull
it out horizontally (g …).
3 Take the wick wheel o the wick
support (g †).
4 Rinse the water tank, water tray and
NanoCloud rotary humidication
wick under a running tap.
Note
• Do not take the NanoCloud rotary
humidication wick o the wheel
during cleaning.
• Do not scrub the NanoCloud rotary
humidication wick or place it under
direct sunlight.
• If necessary, use a mild detergent to
clean the water tank and water tray.
In this case, rinse the water tank and
water tray thoroughly.
5 Wipe the outside of the water tank
and water tray dry.
6 Place the wick wheel on the wick
support (g m).

14 EN
Note
• Make sure that the pre-lter is
completely dry. If it is still wet,
bacteria may multiply in it and
shorten the lifetime of the pre-lter.
5 After the pre-lter is completely dry,
place it back into the back panel
(g h).
6 Touch and hold for 3 seconds to
reset the pre-lter cleaning time.
Descaling the
NanoCloud rotary
humidication wick
Filter alert light
status Follow this
F0 displays on the
screen and wick&
pre-lter cleaning
alert goes on
Descale the
NanoCloud
rotary
humidication
wick
1 Pull out the water tank (g j).
2 Lift the water tray upwards and pull
it out horizontally (g k).
3 Take the wick wheel o the wick
support (g †).
4 Soak the NanoCloud rotary
humidication wick in cleansing
agent (e.g diluted white vinegar,
Citric acid solution) for two hours
(g ˆ).
Note
• When placing the wick wheel on the
wick support, make sure that the
projections on the wick wheel falls
into the corresponding grooves.
7 Place the water tray back into the
appliance (g n).
8 Place the water tank back into the
appliance (g r).
Cleaning the pre-lter
Note
• If the pre-lter is damaged, worn or
broken, do not use. Visit
www.philips.com/support or
contact the Consumer Care Center
in your country.
Filter alert light
status Follow this
F0 displays on the
screen and wick&
pre-lter cleaning
alert goes on
Clean the pre-
lter
1 Pull the top part of the back panel
towards you to release it from the
appliance (g c).
2 To remove the pre-lter, press the
two clips down and pull the lter
towards you (g d).
3 Wash the pre-lter under a running
tap. If the pre-lter is very dirty, use
a soft brush to brush away the dust
(g ‡).
4 Air dry the pre-lter.

15EN
English
6 Replace the
filter and wick
Understanding the
healthy air protect lock
This appliance is equipped with the
healthy air protect lock to make sure
that the Nano protect lter and the
humidication wick are in optimal
condition when the appliance is
operating. When the Nano protect lter
and the humidication wick are almost
expired, the replacement light
ashes and the lter code displays on
the screen (see Filter alert chart).
If you do not replace the lter and
wick in time, the appliance will stop
operating and get locked.
Replacing the
NanoProtect lter
Note
• The air purication lters are not
washable nor vacuum cleanable.
• Always turn o the air purier and
unplug from the electrical outlet
before replacing the lters.
Note
• Please use mid or acid cleanser
• White vinegar (5% acetic acid)
mix with equal amount of water
• 4g citric acid with 4L water
• If there are white deposits
(limescale) on the lter, make sure
that the side with the white deposits
is immersed in the water.
• Do not take the NanoCloud rotary
humidication wick o the wheel
during descaling.
5 Rinse the NanoCloud rotary
humidicationwick under the tap
to rinse away vinegar or citric acid
residues. During rinsing, turn the
wick so that both front and back are
rinsed (g.‰).
6 Air dry the NanoCloud rotary
humidication wick (g Š).
Note
• Do not put the NanoCloud rotary
humidication wick under direct
sunlight.
7 Touch and hold for 3 seconds
to reset the NanoCloud rotary
humidication wick cleaning time.

16 EN
Filter alert chart
Filter alert light
status Follow this
A3 displays on the
screen
Replace
NanoProtect
lter HEPA Series
3 (FY2422)
C7 displays on the
screen
Replace the
NanoProtect
lter Active
Carbon
(FY2420)
A3 and C7 display
on the screen
alternately
Replace both
lters
Replace the NanoProtect lter when
ashes on the screen (g ‹).
1 Remove the used NanoProtect lter
from the appliance (g Œ).
Note
• Do not touch the pleated lter
surface, or smell the lter as it has
collected pollutants from the air.
• Wash your hands after disposing of
the used lters.
2 Remove all packaging material of
the new NanoProtect lter (g f).
3 Place the new NanoProtect lter
into the appliance (g g).
4 Touch and hold for 3 seconds to
reset the NanoProtect lter lifetime
counter .
Replacing the
NanoCloud rotary
humidication wick
Filter alert light
status Follow this
F1 is displayed
and the lter
replacement light
ashes on the
screen. (g )
Replace the
NanoCloud
rotary
humidication
wick
1 Take the wick wheel o the wick
support (g †).
2 Grip the shaft screw on the
other side of the wheel, rotate it
anticlockwise to release the wick
from the wheel (g ).
3 Unfasten the locks on the edge
of the wheel successively to
disassemble the wick wheel
(g ) .
4 Take the used NanoCloud rotary
humidication wick out (g ).
5 Remove all packaging material
of the new NanoCloud rotary
humidication wick (g ‘).
6 Place the new NanoCloud rotary
humidication wick in the wick
wheel, and then fasten the locks on
the wick wheel (g ’).
7 Place the wick wheel on the wick
support (g m).

17EN
English
Note
• When placing the wick wheel on the
wick support, make sure that the
projections on the wick wheel falls
into the corresponding grooves.
8 Place the water tray and water tank
back into the appliance (g n).
9 Touch and hold for 3 seconds
to reset the NanoCloud rotary
humidication wick lifetime counter.

18 EN
7 Troubleshooting
This chapter summarizes the most common problems you could encounter with the
appliance. If you are unable to solve the problem with the information below, contact
the Consumer Care Center in your country.
Problem Possible solution
The appliance
does not work
even though it is
plugged in.
•The lter replacement light has been ashing but you
have not replaced the NanoProtect lter, and the appliance
is now locked. In this case, replace the lter and reset the
lter lifetime counter.
•The water rell light ashes. Make sure the water tank
is properly installed and there is enough water in the water
tank.
The appliance
does not work
even though it is
switched on.
•The appliance is working but the buttons are not responsive.
Check if the child lock is on.
There are
some white
deposits on the
NanoCloud rotary
humidication wick.
•The white deposits are called scale and they consist of
minerals from the water. Scale on the NanoCloud rotary
humidication wick aects the humidifying performance,
however it does not harm your health. Follow the cleaning
instructions in the user manual.
No air comes out of
the air outlet. •Plug the appliance into the power supply and switch on.
The airow that
comes out of
the air outlet is
signicantly weaker
than before.
•The pre-lter is dirty. Clean the pre-lter (see the chapter
"Cleaning").
•Make sure that you have removed all packaging material of
the NanoProtect lter.