ISOLATE THE MAINS POWER BEFORE OPENING THE REAR OF THE OVEN.
Remove the oven, open the back, remove the fan, and clean with WD40, afer the fan is dry, fit the fan back into the housing, replace back and put into cabinet, switch on low, if the fan makes a whirring noise, or unusual squeeking replace the fan, if however the fan sounds normal and good pressure when door is open, it should be okay. If you require a part go to whitegoods.co.uk
Hope this is helpful
johnf1
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We discovered that this oven has two fans, one located at the back and another on the top, outside the oven it's self and under the the top cover. It is a smaller fan housed in a plastic casing and it was this that was causing the problem. The centre hole in the blade had become inlarged causing the fan to wobble and was hitting the plastic casing thus causing the noise. We found it imposible to replace the blade but a "very nice man" managed to make the hole smaller again for us and it is now running perfectly.
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