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.
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.
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 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 contacts (see B and C) 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.
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 substances in tap water are the reason for the change in colour. The filter cassette changes colour faster depending on the water quality. It does not look nice but it is harmless. If you haven’t used the filter cassette for a long time, you can 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?”).
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.