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Yep seems to

Vaillant engineer tightened or loosened bolts and noise gone. Hopefully for good.

I can now add to this thread. One year old Eco Fit Pure Boiler by Vaillant. About five months ago very loud clicking noises. Disturbs my sleep & happens every time it fires up and down. Completely unacceptable. First service last week & engineer agrees not correct but cannot touch it as under...