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Boiler keeps blowing fuse

No sorry Ollski, that was an earlier mistake which I thought I had rectified, because I had not seen the system and was just going on what someone had said... It is wired correctly to a fused 3A spur.
 
So the 3a fuse at the fused spur is fine?. i've never seen a 3 amp mcb either, are you just reiring an old fuse with 3a fuse wire?, and finally is the heating system the only draw on the fuse at the board?
 
Ollski... Sorry mate, I thought that i had already corrected that part of my original post. There is a fused 3A spur and this is correctly wired, that is the fuse that is blowing.
 

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