Tunze 5017

[Deve]

Hi, I just bought and put in a 5017 ATO. It keeps overfilling. I'm not sure why as I have both the sensor and shutoff switch mounted on the magent and it is also located in the return chamber of the sump. I'm freaking out as I am going out of town tonight. Suggestions!

 

[Deve]

here are some photos. The aquarium on the right is the reservoir

 

[Tom@HaslettMI]

Looks like the ATO reservoir water level is above the sump water level. If so, it is creating a siphon. Be sure the reservoir water is lower that the sump and that the output tube is not below the sump water.

Tom

 

[pecan2phat]

Yep, that is your problem. If your reservoir level is higher then the end of your output tube, it's going to slowly siphon backwards.

 

[rvitko]

I agree, I think it is a siphon.