My cooker has a digital clock with an auto delay timer - sometimes it gets set accidentally and the oven won't work. To fix it I ...
Cycle the electric power off and on again so that the clock flashes - then depress and hold in buttons two & three from the left and use the plus & minus buttons to set the time - any time will do the cooker just doesn't care.
Good luck...
Peccavi, September 2010
