Model 696-400. Why does it always empty the right tank first?

SOURCE: tanks not draining

You may be over-tightening the caps. It's tempting to over-tighten because it's a big tank of water that you're about to turn upside down! I had the same problem and the fix turned out to be just that - take the tank(s) back out, loosen the caps (hear the Ssszzzzz as the vacuum breaks), now tighten the caps again, but just enough that the water doesn't leak, and no tighter. Get the cap snug, but not so tight that you couldn't turn it some more. Do it over a sink the first couple of times until you get the feel of it.

SOURCE: We need a copy of the manual for a Bemis H12-600 humidifier

We found the manual!

Thanks anyway.

SOURCE: Left Tank won't empty

Eureka! Solved my "left bottle not emptying" problem. The problem was not with the bottle but that the top of unit which houses the on/off switch was not seated properly. It takes only a very slight difference in water level for the float to activate the switch, therefore if the top is raised even 1/4" the unit will shut off before the water level is low enough to allow the left bottle to drain.

SOURCE: Humidifier says reserve tank is empty when it's not.

With this model it has not only been discontinued and difficult to find repair and replacement parts. I would suggest a new product. I wish that even in theses times I had more encourageing news because most of the time if its broke fix it..but this time, It's time to go shopping, also the company has sold twice, and now goes under two sub names. Have a great day. Thank you for your time.

SOURCE: tank is broken on Honeywell HCM-560 humidifier.

you type in on the internet. www.appliancefactory.com
in the search bar type in your model number. it might take a minute to load but you will have 3 pictures that come up. click on any of them and scroll down alittle until you see water tanks. you can order them there.. or if youdon't want to go that route you can always try local hardware stores to see if they have it as well.