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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My lennox furnace works just fine except that 25% of the time the fan keeps running when it shouldn't and blows cold air

You are using too restrictive of an air filter. If the codes you are getting off the lights says anything about a high limit this is the cause of your blower running all the time. Use a less restrictive filter or have your contractor install a media filter in the system. if you reset the furnace and it does not stop running the blower you have a stuck limit switch and may have to get another or call a service tech to reset it or replace.

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Humidifier Running Continuously with Fan Blower

As long as the humidifier start/stop is regulated by air flow there is no way to cycle it on/off with another device. If, however you disconnect that capability and, instead wire it to the heat on cool on switch it will only turn on when the stat calls for heating or cooling. You may need to install an intermediate relay off the stat wires to regulate the different(assuming that they are) voltage of the humidifier start/stop.What a fun project, thanks!

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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...

If your "tap water" is from a well, the humidifier may be clogged with mineral scale. Even if it is not well water, your municipal source may have a high mineral content.

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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Model 758743300c no humidy

'No Humidity'-- sounds like the humidifier is NOT adding moisture to the room it is running in?

Can you give us some clues?--
Like-- How is the pad look inside?
Are the fan(s) running?
are there any indicator lights lit?
Did it work for awhile, and stop?
What stopped first?-- the fans, or the little rotating wheel?
any clues that happened at the time it quite?
When was the last time the unit was opened up and cleaned out?
These devices need regular maintenance-- they build up mold and scale.

Please give us some clues to work with--

Mack B

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The fan is loud and the motor is running "hot". Is there a place to oil the fan's motor?

This is a sealed bearing motor so there is no oil ports. You can blow out with compressed air and spray motor shaft with WD-40. Be careful not to spray any lube inside motor. If you can get to them blow out motor cooling ports .this should help motor run cooler and quieter. Hope this helps you. Thanks

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Sounds like your motor bearings are going bad. If at all possible lubricate the motor bearings using a few drops of a NON detergent oil. If the motor has sealed bearings with no oil ports then you should replace the blower motor.
Good luck

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