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Thanks for all your in put. I've got a engineer coming out tomorrow, whats the odds my "thump" sound will go shy and not be heard? I'II post again after with the out come.

Why would it go away the longer the system was running as per my original post. As I sit typing the boiler has just ignited and the noise is still there but it is very very soft thump which if you didn't know what you were listening for you wouldn't notice it. There is a definite gap between the...

We did get a problem about 2 months after it was installed where there was a loud thumping noise that went on for quite a while we turned it off straight away. We got our cover engineer out and he said it was to do with the rubber collar (I think its rubber) between the boiler and the vertical...

I have a Icos HE18 boiler in a cupboard which was fitted just under a year ago. It does my heating and heats a hot water cylinder tank. Lately in the mornings as the system comes on with the timer within a couple of seconds of the boiler igniting, there is a loud thump noise that occurs. I seem...