Hello, I have diplomat oven, doing exactly the same. On the net I have found it is an Oven Fan Control PCB, which is approx £50-55. My husband can fix it, but I am a bit nervous about buying it to find it won't solve the problem. Is this what you are on about. It makes the fan run properly. Someone else told me that if the fan is dead then you need the fan, if it moves even slowly it is the printed circuit board above ?
I aint fixed mine yet, but i am tempted to buy one and try.
Karen Walker, September 2008