Frequently asked questions about Oskar little

It may be that your external hygrometer and Oskar little 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 little displays optimum 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 little on the wall with a clearance of at least 30 cm. Oskar little 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.

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

Set the output level 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 little is functioning properly. If the filter cassette is more than two months old or if the upper part is hard and no longer soaked with water, it must be replaced.

Decalcify the water tank regularly to ensure trouble-free operation.

Oskar little 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 contact with a damp cloth, dry them and place the upper part back on the bottom part.

Yes, both filter versions can be used with Oskar little. 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.

In order to clean the inside, remove the filter cassette 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 filter casssettes have to be disposed of with regular household waste.

For the hygienic and ideal operation of the air humidifier, the filter cassette needs to be replaced every two months. If the filter cassette is 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 filter cassette is no longer ensured. The filter cassette can usually be obtained from where you purchased the unit. The following video tutorial shows the correct replacement of the filter cassettes.

During the evaporation process, the lime present in the water is collected in the filter cassette 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 filter cassette 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 little, salt may collect in the filter cassette instead of limescale.

If the top part of the filter cassette has become hard and it has been in use for less than 2 months, it can continue to be used in spite of this. Before you do so, you should remove the filter cassette from your Oskar little, rinse it thoroughly with water, turn it over and put it 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 filter cassette depending on how contaminated the filter is by constituents in the air or the water.

If the filter cassette is more than two months old, replace it with a new one (see the question “How often do I need to replace the filter cassette?”).

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 little for some time. If the evaporator cassette is 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 filter cassette time to dry. Refill the water again if Oskar little is used regularly.

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

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

Please read the instructions on the label on the inside of the upper part of Oskar little or watch the following video tutorial.

The picture shows the position of the Water Cube (previously Silver Cube) in the water base of Oskar little. 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 little 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.

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