Mathew Newton explained :
That's not good to hear, but good to know - thanks!

I have a couple of spare fans for that boiler in my hut, if they might
be of use to you. One is a used working one, the other brand new
unused. I bought one when the boiler suggested a fan fault, before I
found the over heated and shorted fan loom running behind the boiler.

They are free for collection.