My autofill level is set by something resembling a toilet float under a seperate lid in my pool deck - if I want to turn it off completely (ie not just change the level) I have a valve (similiar to a faucet valve) I turn off where the pool ties into the water line (for me near my sprinkler valves). I think that if you want to turn yours off you'll need to turn off the valve at your water source - not through your controller (I too have the Pentair Intellitouch set up).

As Jennifer said the auto-fill operates mechanically via a float. You won't find anything for it in your Intellitouch programming, it's unrelated. You should have an access hatch somewhere around the perimeter of your pool that has a float inside it. Check the float and see if it's submerged. If some debris got in there it may just be hung up. Or it's possible the float developed a leak and is submerged (and therefore not shutting the water flow off). Do you know if your autofill is tied into your sprinkler system or to a hose bibb? If it's tied into a hose bibb next to your house, you can shut it off there and it'll quit filling your pool.

thank you for your help! I am not aware of another valve to shut off the water but I did find the float. I will have to check with my pool guy about the filling issue. thank you again!
Dianne