Ato turns off Powerhead

I didn't know you had every thing on a controler, well then it could also be your controlers settings check them out. You may just have to move the ATO plug to a different out let as the controler maybe sensing a draw on that outlet and shutting down the PH outlets. Kind of like a auto feeder program but you don't have auto feeder pluged in it just the ATO. Or just reconfigure the controler.

Bill