HELP!! Does any one know what the code F8 means on a Jenn Air Convection Wall Oven? It won't stop beeping!

I need help. I was gone over the weekend and while I was gone, my roomate used the Jenn Air Convection Wall oven to cook and now it constantly displays a code F8 on the screen and locks the oven door. If I hit cancel, the ovens fan goes on for a few minutes and then it starts a loud beeping sound that will not stop. I need help!!