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Hi Nickso Good call, now had 3 days of rattle free boiler use!!! probably jinxed that with this reply LOL. Didn't need to use anything more abrasive than some descaler and my finger nail ! regreased and reassembled piece of Pxxx. Thanks for your help again. Tony ps If you ever...

Interesting indeed and the noise does reduce substantially when hot water is drawn. Certainly worth a go before spending money elsewhere. Thanks.

Don't suppose it makes any difference but is the problem due to poor boiler design or a poor quality part ie a return spring? or do particular installations suffer due to environmental or other circumstances? My boiler was installed as a replacement but the system was not flushed and problems...

Its a good idea but would use a piece of hard wood dowl instead much safer especially where electricity is involved. I've seen mechanics use the technique to isolate rattles in engines.

LOL I loved this reply! And happen to agree with this diagnosis, I will give it a try as the boiler was reasonably quiet for a few years except when scale was a problem. Thanks to all who replied I am now a fan of the site have a good new year. Tony

I have a 6 year old boiler which has had many problems largely due to the regularly mentioned heat exchanger scale problems - now have a water softener and far fewer problems. A recent and new problem is a rattle that appeared to come from the main heat exchanger now changed and further...