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Tighten the bolt that holds the fan blades on the axle. Might need to pull off the fan protecting grill thing.
Failing that you could get and fit a new fan and motor but it's a ball ache. You might find the existing fan will not part company with the axle meaning you can't get the old assembly off without a grinder and who has the time for that.
We just replaced ours with a cheapy from AO - it was mid lock-down so they wouldn't fit it for us. But fitting them is easy. But you might find your existing oven is directly wired in whereas the new one will have a socket fitting. I ended up trimming the spur cable and fitting a new plug socket, then connecting up to that. Fun times.
Our oven (terrible timing given we should be moving in the next few weeks) has started making a horrible noise like the fan is hitting metal while its spinning. It happens for a few seconds fairly regularly while turned on now, just started on thursday.
I took out what I could from the front and cleaned it up to no help. There is definitely play in the axle of the fan in all directions.. options:
a) stop using it, next owners problem
b) keep using it, next owners problem (could get worse? explode?)
c) find someone (no idea who?) to try and fix it at our expense.
Its a standard, built in fan-assisted hotpoint.