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Beerlover..... which bit of "installation engineer coming round" do you not understand ? ? Read before you rant ! If you are a pro and not DIYer, then how about using your wealth of experience and advice as to what you think could be causing the noise - then - I can point my installer or...

Once again thanks. All of above taken into account. Installation engineer is coming round - I will see what he does and then advise on above solution if he does not do it himself. He will check for leaks - so will hopefully solve problem. Some DIYers do know what they are doing - and will...

Thanks for getting back to me - I will give it a try. Is it the 4 torx screws on the burner module (Coming out from the centre of the heat exchange - and has 4 torx screws in each corner of the square) They are the only Torx screws I can remember seeing. Once again, thanks for the help.

Hi, I have the same boiler and same problem. Did you get it all fixed, was the heat sink on the torx screws the solutions ? Where do I get "Heat Sink" ? Thanks. (Hope you are all reading replies after a year !)