Tunze Osmolator 3155 Won't stop pumping water.

[gmastr85]

My Tunze Osmolator has worked fine ever since I got it, which is about 2 months. It has worked flawlessly. Yesterday I switched from a 7 gallon top-off container to a 20 gallon top off container. I unplugged the unit and unhooked the pump so that I could route the wires through the hole in the top off container. I then reconnected the wire and pump hose and plugged it back in. I plugged it back in and walked away thinking it was fine. A couple minutes later my alarm is going off, and when I looked the pump was just overflowing the return area of my sump. It won't shut off.

I've read the manual, which tells me absolutely nothing. I disconnected the hose and wires and tried setting it up again thinking I did something incorrectly. But it does the same thing. It just keeps pumping. Not sure what to do now but any help would be appreciated!

Thanks!

 

[cordell]

Is the pump actually running, or is water siphoning from your ato container to the tank? You say you got a bigger container, which may be taller than the old one, so if you are topping off into a sump, you may need to raise the output hose to stop it from siphoning.

I've never used this ato, but thought I'd give you my $.02, as I think this is a "feature" of almost every ato.

 

[rvitko]

What Cordell said.

If the hose ends at a lower point than the water level in the reservoir, water will siphon until the levels are equal. No safety can stop this except gravity, you must either use a shorter reservoir or route the hose to a higher point, like the tank or overflow box.

 

[gmastr85]

Thanks!

Thanks!

You are both exactly correct. I just need a larger topoff container. I will try to find a short, wide container. Once I lowered the level in this larger container it stopped the problem.

Thanks so much for your help!