Honeywell humidifier QuickSteam powers, digital commands adjusting works, but no heat no steam. Thermal fuse is OK.

SOURCE: Honeywell HE440A steam power humidifier

Honeywell has had lots of problems with this humidifier. They are coming out with a completely redesigned steam humidifier that will be available in a month or two. If you know who installed it (through equipment stickers and such) you can probably get them to swap your old trouble prone unit for the new design for just the labor. If they won't, then push them to talk with their Honeywell distributor about it.

The problem is most likely a stuck float in the humidifier. There are two floats that run up and down. One that tells it when to add water, and one that is a safety. They both tend to get stuck with mineral deposits.

You can fix it by unplugging the humidifier, turning off the water, draining the pan (unscrew the drain on the bottom a few turns), disconnecting the water lines and wires (2 molded plugs and 2 screw terminals-don't worry about if they get swapped). There should be a couple of screws that lock it into the ductwork such that when you remove the screws you can pull the whole unit out to see inside the water tank. Then just clean everything out well and put it back together in the same order.

You really do want Honeywell to get you a new humidifier though.

SOURCE: Honeywell True Steam Humidifier

Yes you will want the out door sensor. The reason why is it is going to read the average temp outside and will adjust what you hum is producing due to the temp outside, that is so you dont cause condensation on your window. You can run it in manuel or auto but i would strongly reccomend to run it in auto.

SOURCE: Am looking for the owner's manual for the

you can download here
http://rapidshare.com/files/225370310/4858c9fccc48b69c50a7b921cff38680.pdf.html

SOURCE: Honeywell Natural Warm Moisture Humidifier Is On But No Steam?

I have the same problem and I have 2 of them fairly new. I can't seem to find out what the problem is either.

Stumped?????????

SOURCE: I need the operation manual

Here is a link to your Owners Manual that you can download and print. Please do not lose it, as this model has been discontinued by Honeywell.

http://www.honeywellcentral.com/ssi/pdf/honeywell-commercial/QuickSteam-OwnersManual.pdf