Assuming you have an Aria Deluxe II, there are two modes. A residential mode and a water saver mode. Sounds like you are in the water saver mode. There should be a Mode Selector Switch on the back of the toilet. Flip the switch from "B" (water saver) to "A" (residential) mode. You may need a mirror to look behind the base. Now, how the grandson managed to do this... who knows. Hope this helps.