Honeywell humidifier model HCM-305T-CST. when running it sounds like something is interfering with the fan

remove and clean the filter then re-install it the air is being blocked

Yes, there is. Routine maintenance is important. Mix a 50/50 solution of White Vinegar and Bottled Distilled Water and fill the tank with it. Run the humidifier until the tank is 1/2 empty. Then empty the remaining solution and refill the tank 1/2 way with Bottled Distilled Water and run it until it's empty. This will flush the entire system of the previous 50/50 solution. If you can access the fresh air intake, clean that using a can of compressed air with a straw nozzle (like you clean your computer with) to blow out the accumulated dust. Be sure the unit is completely dry before storing it.

If more folks would do this, they wouldn't have problems in the Fall & Winter.

Soaking it in warm water no soap. or buying new found here
http://www.google.com/search?sourceid=chrome&ie=UTF-8&q=Honeywell+HCM-6011i+Humidifier+how+to+clean+filter#q=Honeywell+HCM-6011i+Humidifier+how+to+clean+filter&hl=en&prmd=ivns&source=univ&tbs=shop:1&tbo=u&sa=X&ei=5QVzTeWgB5OUtwfavqj2Dg&ved=0CEAQrQQ&biw=1920&bih=1099&bav=on.2,or.&fp=563c33928d93abad

Hope this helps

Positive Feedback ALWAYS Appreciated :)

I was having the same issue. I noticed that when the main fan unit was removed, there was a small plastic piece that was sticking up from the base next to the filter, which has a female end on the fan unit. I played with this, and realized I could lift it up. Once I did this, I replaced the fan unit and it started working. I think this is the water level reader which, when all the way down, won't allow the fan to start since it thinks there is no water.

There is normally a capacitor to prevent surges across the motor it might the short circuit.# and preventing the motor from starting.

Poor design, buy a different brand, I have owned two, they are junk.

The ability of the humidifier to maintain a given moisture content in the air is far more difficult than a heat or cooling unit to heat or cool the air.

Moisture vapor has far more energy to seek dryer air, than tempered air. So the moisture seeks and finds dryer air quickly, whether it be through stair and door ways, or through cracks and seams in walls and doors/windows, or through non vapor barrier surfaces.

The only way the unit would be able to achieve a humidity level as stated, is for the unit to be placed in a vapor-tite room that has a minimal of leakage.

You could put more humidifiers in the space, or more and larger humidifiers in the space, to try and overcome the vapor moving to other areas of the space. But unless you have a fairly vaportite space, it is unlikely the unit is under capacity, and the only way to test what capacity is needed is to take humidity measurements.

Reply back with any questions you may have.

Thanks for your question,
Sounds to me like you have something partially cloging the misting nozzle, if you can take the nozzle off, and check it I would bet there is something that got in there, if you cant, it might be better to just return the Humidifier where purchased for an exchange, if you can get the nozzle off, if you have a can of compressed air like they sell for dusting off computers, I would use a very short burst of that in the nozzle, and in the feed line, thanks again for your question, let me know how it works out,
mr.grzz

There is a 0 setting on the fan speed setting knob ...

You are looking for replacement filter HAC-504. (which is the filter for the 500 series)

You can order them from Homedepot.com
http://www.homedepot.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10051&productId=100035531&langId=-1&catalogId=10053&ci_sku=100035531&ci_src=14110944&cm_mmc=1hd.com2froogle-_-product_feed-_-D27X-_-100035531

Hope this helps.
Good Luck.