Question about Bionaire BU4000-UC Humidifier

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The fan blows but the humidified air stops after 2 seconds?

The fan blows but after a few seconds the humidified air stops and it just blows regular air. What's the problem?

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This is an old post, but you can make sure the humidity adjustment is full high. Perhaps it is defective or possibly, the environment is as humid as the high setting will allow.

Posted on Jan 14, 2009

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Posted on Jan 02, 2017

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I have 2 of these humidifiers and neither seems to be dispensing moisture into the air. The fans work fine and the filters are new. I am using regular tap water and have placed them in a room and ran...


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Using a 50/50 solution of White Vinegar and water run through the system will usually clean the mineral scale out. In the future, I would recommend that you use Bottled Distilled Water. You can buy it by the gallon, inexpensively at grocery stores or pharmacies.

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Is the level of water dropping? If so, the humidifier is working. If you have a cool air humidifier you won't see any steam or anything at all. You will just feel cool air. Watch the water level and see what happens.

Good Luck.

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