We noticed an LED for Dehydrate on our KitchenAid oven, so we started experimenting until we figured out how to get it into that mode… it doesn’t seem to be documented anywhere. If you have one, here’s how to do it:
1- Cancel any ovens or timers that may be running
2- Press an oven button (I pressed Upper Oven)
3- Immediately after pressing the oven button, press and hold the Convection Bake button until the oven switches into Dehydrate mode (about 3 or 4 seconds)
4- Set the temperature
5- Press Start