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Is changing the pump likely to be "difficult"? - it looks more fiddly than difficult but are there any troublesome aspects to it? I've changed separate pumps before but never one that is integrated into a boiler. Jason

I have a 630 plus with a very noisy pump which occasionally gets "stuck" and gives F.75 error. Usually can get it going again with a gentle tap to the pump body and/or persistent reset button presses until it starts but it is annyoing. I have been led to believe this is likely to be due to...