Frequently asked questions about Oskar

It may be that your external hygrometer and Oskar are measuring different values because the devices are located in different positions (heights) in the room. Different humidity is measured depending on the airflow and temperature. A tolerance of +/- 5 % is normal depending on the type of device. Oskar optimally measures the humidity levels if he is positioned centrally in the room so that the room air can flow towards the sensor as freely as possible. If this is not possible, we would recommend positioning Oskar on the wall with a clearance of at least 30 cm. Oskar should never be “hidden” in the corner of the room or behind a sofa/piece of furniture as this may negatively affect the humidity measurement as well as humidification efficiency.

If the LEDs of the hygrostat are flashing, this indicates that the desired air humidity level has been reached and the device has switched off automatically.

You can use the hygrostat to set the desired air humidity level. To do this, press on the hygrostat button. You can choose between the following levels: 40 % relative air humidity (1 blue lamp), 45 % (2 blue lamps), 50 % (3 blue lamps), 55 % (4 blue lamps), continous operation (5 blue lamps. Please note that the hygrostat needs some time to measure the current humidity in the room.

The hygrostat switches the device on automatically once the relative air humidity in the room sinks below the preset value.

Yes, both filter versions can be used with Oskar. We have recently updated the filter to a new version that works without the plastic frame. There are two reasons for this update: First, we were able to reduce the amount of waste by eliminating the plastic frame. The new filters are made out of textile- and plant-fibre. Second, the new material allows for a higher humidification performance.

First check whether the float gauge (see A) can be moved up and down. It may be that it is blocked due to too much limescale/dirt. Decalcify the water tank regularly to ensure trouble-free operation.

Oskar consists of two parts: A top part and a bottom part. If the top part is not exactly in the right position on the bottom part, the float gauge sensor does not make contact with the electronics in the upper part. Position the upper part correctly to establish the contact.

Should neither of these cases apply, lift off the upper part and clean the contacts (see B and C) with a damp cloth, dry them and place the upper part back on the bottom part.

After changing the filters, the LED for the filter change reminder does not turn off automatically. Press the reset button for 5 seconds (see A), until the blue LED is constantly illuminated again.

The filter-memo function was added in 2015 as part of the technical modifications to Oskar. Products with a production date prior to 2015 do not have this function.

Set the hygrostat at the highest setting. The size of the room, the height of the room (2.5 m) and whether the room doors are closed plays a role. If the room doors are open, the adjacent rooms are also included in the total area. With a lower relative humidity (less than 35 %), the humidity will not increase immediately. This is because the floors, furniture and walls are the first to absorb the humidity before it ends up in the air. It can take up to two weeks for everything to have absorbed sufficient humidity and for the level in the air to increase. As long as you have to refill the water tank regularly, your Oskar is functioning properly. If the humidifier filters are more than two months old or if the upper part is hard and no longer soaked with water, they must be replaced.

For hygienic reasons and to ensure proper operation, we recommend the following cleaning intervals.
Attention: Never immerse the appliance in water (danger of short- circuit).

Daily: Fill the appliance with fresh, cold tap water. If the appliance is not used for several days, empty the water from the lower part beforehand and if necessary, clean it with a bit of dish detergent and a clean cloth. Fill fresh water into the lower part before putting the appliance back into operation.

Every 2 weeks: First remove the filters and the Water Cube™. Clean the inside of the lower part thoroughly every 2 weeks with a bit of dish detergent, warm water and a soft, clean cloth, sponge or brush. Then rinse the lower part thoroughly with cold water and put the filters and the Water Cube back in.

Approx. every 4 weeks (depending on the hardness of the water): First remove the filters and the Water Cube™. In the case of limescale deposits on the inside of the lower part, we recommend using the Stadler Form Cleaner & Descaler ( Alternatively, you can use a household decalcifier or vinegar. Then rinse the lower part thoroughly with cold water and put the filters and the Water Cube back in. For hygienic reasons, the filters must be replaced every 2–3 months.

Regularly as required: For external cleaning, rub with a damp cloth and then dry thoroughly.

At the end of the season: Before storing the appliance at the end of the season, clean it inside and out thoroughly and let it dry completely. Descale the lower part as described above. Clean the fan blades in the upper part with a damp cloth and then wipe them dry. Insert new humidifier filters and a new Water Cube in order for your appliance to be ready for the start of the next season.

In order to clean the inside, remove the humidifier filters and rinse out the water tank. Use a soft brush or a sponge to clean the tank thoroughly. Decalcify the water tank regularly depending on how hard your water it. Thoroughly rinse out the water tank after decalcifying and dry it before operating the air humidifier again. The following video shows the correct cleaning.

Used humidifier filters have to be disposed of with regular household waste.

For the hygienic and ideal operation of the air humidifier, the humidifier filters need to be replaced every two months. If the humidifier filters are used for a longer period, the humidifying effect can be negatively impaired on the one hand and, on the other hand, the antibacterial action of the humidifier filters is no longer ensured. The humidifier filters can usually be obtained from where you purchased the unit.

During the evaporation process, the lime present in the water is collected in the humidifier filters as limescale. The amount of lime present in your water will depend on the hardness of the water. The harder the water, the quicker the humidifier filters will also become hard and will have to be replaced. Note: If you don’t know the hardness of your tap water, you can ask your local water supplier. If you use water from a decalcification system which operates based on the principle of ion exchange for your Oskar, salt may collect in the humidifier filters instead of limescale.

If the top part of the humidifier filters has become hard and they have been in use for less than 2 months, they can continue to be used in spite of this. Before you do so, you should remove the filters from your Oskar, rinse them thoroughly with water, turn them over and put them back again – so that the part which had become hard is in the water. Note: It is possible that you may notice an odour after you have turned over the humidifier filter depending on how contaminated the filter is by constituents in the air or the water.

If the humidifier filters are more than two months old, replace them with new ones (see the question “How often do I need to replace the humidifier filters?”).

A mild yellow or brown discolouration of the filter material, mainly in the upper section, is normal. The residual water needs to be emptied if you do not use Oskar for some time. If the humidifier filters are submerged in water for a longer period of time, without the fan being operated, algal growth may occur or mould may appear. To prevent this from happening, empty the device and allow the humidifier filters time to dry. Refill the water again if Oskar is used regularly.

The substances in tap water or the air are the reason for the change in colour. The filter cassettes change colour faster depending on the water quality. Although this does not look nice, it is harmless as long as it is not due to mould (filter cassettes with mould on them should be disposed of and the appliance should be cleaned thoroughly).

If you haven’t used the filter cassettes for a long time, you can rinse them well, turn them over and continue using them. If the filter cassettes are older than two months, please exchange them for new ones (see “How often do I need to replace the filter cassettes?”). Important: The discolouration of the filter cassettes will not affect the performance of the air humidifier.

The causes of bad smell can be the water and air quality, spent filters or a longer standstill of Oskar with a full water container.

In any case, we recommend you to clean and descale the appliance thoroughly. If the filters have been in use for two months or longer, or in case they are completely hard due to water with a high content of limescale, replace them with new ones. If the filters have not been in use for long, you can rinse them with cold and clean water thoroughly, turn them over and continue using them. If the humidifier filters are affected by mold, they must be disposed of and the device must be cleaned thoroughly.

Please read the instructions on the label on the inside of the upper part of Oskar or watch the video tutorial below. If your model has no label, this means you have an earlier model that can be cleaned with a vacuum cleaner or cleaned by a technician.

Yes, Oskar switches back on automatically after the power supply is interrupted.

The picture shows the position of the Water Cube (previously Silver Cube) in the water base of Oskar. Remove the upper part from the unit and then place the Water Cube in the designated position.

The appliance switches off automatically when the water container is empty. Oskar will not be damaged when he runs out of water.

The intensity of the fragrance is influenced by various factors:

  • Type of fragrance (synthetic, natural, ingredients, etc.)
  • Room temperature and relative humidity (the more humid the air, the stronger the fragrance will be)
  • Room size (the smaller the room, the more intensive the fragrance)

In principle, you can increase the intensity of a fragrance by adding a little more fragrance oil. The strength of a fragrance will depend on the fragrance itself. Natural fragrances are often more discreet than synthetic ones and certain ingredients are more dominant than others.

It should also be remembered that first and foremost, the device is a humidifier. Its main focus is to provide humidity in the room and because of that, the intensity of its fragrance will never be as strong as the fragrance from an aroma diffuser.

Oskar is an evaporator. During the evaporation process, the dry air is drawn in and routed through the moist humidifier filters. In the process, the air only absorbs as much water as it needs. This humidification system is inspired by nature. Oskar emits the humidified air back into the room through the grill in the top part of the device. As the water is neither heated nor nebulised during evaporation, no water vapour or visible mist is produced.

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Yes, your settings will be saved. If Oskar is switched off and then on again or the top section is removed and then put back again, the most recent settings used will be applied.

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