Auto top off system.

[Douglas]

It's weird, because it's a brand new set up, just installed. Puzzling..... Don't know if it's the lines....could be the pump.(but it's brand new also.)

[Brent F]

Is the ATO reservior higher than the sump? It so, it is possible you are getting a siphon.

[chris c]

Originally Posted by Brent F

Is the ATO reservior higher than the sump? It so, it is possible you are getting a siphon.

this is what happened to me to try running your topoff water in to your tank not your sump this is what i did and it works great now.

chris

[Douglas]

I'll probably keeping the sensor in the sump, and put the return line into the tank.(which is higher than the reservior.) Grade 6 science. I'll try that. Cool, hope it works. Thanks, Doug