Sometimes when we wipe over the front of our oven - where the controls for the digital clock/timer are we accidently set the delay timer and only discover this when we next try to use the oven.
The solution is to turn the electricity to the oven off and on again and reset the clock time (any time will do) and the oven then works. I have to depress and hold in buttons 2&3 from the left and use the plus/minus buttons to set the time. Yours may be different.
I hope this is the problem you've got because it's a quick and easy fix.
Peccavi
August 2009