I've seen this on my EDB710, and it's just something to do with the timer. I think you've set it (unintentionally probably) to switch the fan oven on and off automatically.
You need to set it back to manual, which I believe you do by pressing the "cookpot" and the button to the right of it at the same time.
The cookpot will show in the display and the oven will switch on again.
This instruction is also in the manual on page 13.
David
November 2007