No mist my hm500-uc1 use to work fine until one day it just stopped spraying the mist. Everything works, the fan, the speed controls, just no mist! Why is there no mist? what am i doing wrong?

All question need full 'make model (what it is)' to answer efficiently.

Some actually spay a mist of water, but the better one suck dry air in and blow moister air out through the saturated filter membrane.

The ones that spray water mist damage furniture and anything near it. If it is the spray type, it needs descaling.

You could Google

make model manual

Or list it under her by clicking Comment under _my_ answer.

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"Take the humidistat out of the humidifier and look for the 3 slits below the restart button, take a hair dryer and send some warm air into those slits for 5 minutes. That usually recalibrates the humidifier."

Mine is a SUL495 Filter Free unit and worked fine last year and the first couple of days recently, but I'm having the same issue, motor running , no mist, and trying to talk to someone @ in customer service today is a joke, I've cleaned everything but still no luck, I paid $40.00 for this unit in Jan. 2011 and have about two weeks until the warranty runs out, and the other wonderful thing is the nearest service center is about 50 miles away, I may wait until Monady to try to speak to someone, but I probably won't like the answers.

If you can see the mist, then, it is working. The outlet
port of your humidifier could be closed/stucked up/clogged. Please check this the outlet port.

I have this same problem. And cool mist humidifiers DO produce mist. I have had my humidifier for a while now (6 years) and have never had any problems. But after the most recent cleaning, it worked at first, but now seems to not be working anymore... Am also wondering if there is anything I can do to remedy the situation?

unfortunately on a cool mist unit the mist shouldn't show up. on most units that's what it does. the warm mist units show the mist.. the best way to tell is if you put your hand over the spout that the mist is suppose to come out of for about 2 minutes and you pull it away and it feel clammy then it's working. if your hand is still dry please let me know and i'll see what else i can do for you.

unfortunately running the unit for too long will permanently ruin the unit. there isn't really a way to fix it. i do deeply apologize for that. so unfortunately you might have to replace the unit.

It started working again on its own. Not much of a solution!

I think some water must have got into the electronics and then once it dried, the humidifier started to work again.

Christiaan