All the water in the humidifier leaked all over the floor. What would cause this? there was a filter in it

I DON;T KNOW. MOST WATER IS LET IN WHEN NEEDED BY FLOAT VALVE AT BOTTOM OF BOTTLE OR LOWER.
PERHAPS IT NEEDS CLEANING. CONSIDER USING
STRAIGHT VINEGAR IN LEAKING SIDE THEN GOOD SIDE. IF NOT OK, YOU MAY HAVE TO TAKE UNIT APART TO INSPECT FOR CAUSE.

Does it get heated? If so, Heat makes filter dry and it starts to leak.

You may be over filling the unit. Take the refillable water tank out and with the power removed try to remove all the extra water where the tank goes. check for anything that looks cracked inside the unit the best you can. If the tank is seating properly it should not leak. If it is filled properly it should not leak.

My humidifier is leaking. I is a Vicks V3900 Germ Free Cool Mist Humidifier. How do I solve this problem

A leaking humidifier is a sign that the unit's filter needs to be cleaned/changed. I had the exact same problem on this model.

Humidifier water pad comes w/ a mark in one end, that mark should be on top. Also check your feed tube they tend to crack some times. if if still leaks water change the water pad

This happened to me the second night of use.  Water all over the carpet and a dripping vent. I called customer service and they told me to remove the tank and filter, and run unit dry for an hour or so. Then restart it.  Worked fine after that.  I think we may have bumped it which is said to be the cause of most leaks.  Bummer is that after 5 night of use the grip on water tank slipped and the tank is in pieces.

Your V5100N ultrasonic humidifier generates a fine mist by vibrating the water at an exremely high speed. The water doesn't actually evaporate until after the water mist is in the air. As the tiny water droplets evaporate in the air, the calcium and other minerals settle on your floors and furniture.

Humidifiers that evaporate the water in a filter wick, or with heat, do not generate dust because the water evaporates inside the unit and the calcium is trapped inside.

You can avoid the dust problem with your humidifier by using distilled water. Distilled water is available in most stores that sell bottled water in gallons...but be sure to choose "distilled" water, not "purified" water. Try the distilled water in your steam iron also...if you have one. It will last longer.

your drain pipe is clogged up, going to drain- Duh

My Air-O-Swiss U7142 has a leak from the very bottom. I found that as long as the water flows on to the "pan" that evaporizes the water, the water will come out from the bottom. Does anybody know how to fix this?