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button to adjust the sensitivity level of the air quality sensor. »»One of the .. lights ( , , or ) goes on to show the preferred sensitivity level of the air quality sensor. 3 Press the .. button to switch off the purifier. Note ••When you change the sensitivity, the purifier automatically starts operating at the set sensitivity level whenever you switch on the purifier. Change the fan speed Manual You can select the desired fan speed. Note ••When you select a fan speed, you can also use the timer function (see “Set the timer”). In this case, one of the lights (AC4012: and ) and the .. light ( , , or ) are on. 1 Press the .. button to switch on the purifier. EN 2 Press the button once or more times to select the desired fan speed. »»For AC4012 - , , or ; and »»For AC4014 - , , or . Tip ••If the air quality light is in blue color, this means the air quality is good, and you can select a lower fan speed. Sleep mode In sleep mode, the air filter operates very quietly while all lights are dimmed for your undisturbed sleep. (AC4012 only) 1 Press the .. button to switch on the purifier. 2 Press the button to select sleep mode. »»The light goes on. To change to another fan speed, press the button. EN Set the timer With the timer function, you can let the purifier operate for a set number of hours. When the set time has elapsed, the purifier automatically switches off. You can use the timer function in the following situations: Situations You will see Choose a fan speed (see ‘Change the fan speed’). One of the lights (AC4012 - , , or ; AC4014 - , , or ) and one of the .. lights ( , , or ) are on. The purifier is in sleep mode (see ‘Sleep mode’). The light and one of the .. lights ( , , or ) are on but dimmed. 1 Press the .. button to switch on the purifier. 2 Press the .. button to activate the timer. »»The .. light ( , , or ) goes on. 3 Press the .. button repeatedly to choose the number of hours you want the purifier to operate. The corresponding .. light ( , , or ) goes on. To deactivate the timer function, press the .. button repeatedly until the .. light ( , , or ) is out. EN 5 Clean your air purifier Note ••Always unplug the purifier before you clean it. ••Never immerse the purifier in water or any other liquid. ••Never use abrasive, aggressive, or flammable cleaning agents such as bleach or alcohol to clean any part of the purifier. ••Only the pre-filter is washable. Other air purifier filters are NOT washable nor vacuum cleanable. Clean the air purifier Regularly clean the inside and outside of the purifier body to prevent dust from collecting. 1 Wipe away dust with a soft dry cloth from the body of the purifier. 2 Clean the air inlet and the air outlet with a soft dry cloth. Clean the air quality sensor Clean the air quality sensor every 2 months for optimal functioning of the purifier. Clean it more frequently if you use the purifier 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 the air quality sensor outlet with a soft brush. 2 Remove the air quality sensor cover. 3 Clean the air quality sensor, the dust inlet and the dust outlet with a lightly moistened cotton swab. 4 Dry them with a dry cotton swab. 5 Reattach the air quality sensor cover. EN 6 Clean the pre- filter Note ••The pre-filter is washable. ••Clean the pre-filter for every two weeks to ensure optimal functioning of the purifier. 1 Switch off the purifier and unplug it. 2 Place your fingers in the recess of the side panels and gently pull the bottom part of the front panel towards you (1). Then lift the hooks at the top of the panel out of the top of the purifier (2). 12 3 To remove the pre-filter, grab the two projections and pull the filter towards you. 4 Wash the pre-filter under a running tap. If the pre-filter is very dirty, use a soft brush to brush away the dust. 5 Air dry the pre-filter. 6 Put the pre-filter back into the purifier. Attach all hooks properly to the purifier. EN 7 To reattach the front panel, insert the top hooks into the top of the purifier first (1). Then, push the panel against the body of the purifier (2). 12 Note ••Alternatively, you can clean the pre-filter by removing the dust with a vacuum cleaner. ••Make sure that the pre-filter is completely dry. If it is still wet, bacteria may multiply in it and shorten the lifetime of the pre-filter. ••Make sure that the side with the two projections is pointing towards you, and that all hooks of the pre-filter are properly attached to the purifier. EN 7 Replace the filters The filter replacement light ( ) indicates the filters have to be replaced. Note ••If you remove the front panel for filter changing while the purifier is switched on, a...