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Many thanks Ricarbo, I'll give a try at adjusting the valve at the weekend; i did look at the BES website suggested by piperpete (thankyou BTW) but couldn't see an automatic valve only the differential bypass valve which i think it might be; but i will enquire at the local plumbers merchant...

yes, that's exactly it in the photo & the pipe is indeed plastic; so is that indeed likely to be a bypass? The slot in the valve is diagonal to the pipe at about 45 degrees & there is some water running in the pipe as it was hot to the touch...........

Softus, I had a look under the floor at the weekend & the "bypass" consisits of a plastic piece of tubing between 2 adjacent pipes running under the floor, connected in to each using a tee piece; in the piece of tubing there is a metal insert piece which seems to have an adjustment screw on...

Softus, In answer to your question, yes there are trv's on every radiator & also the noise does stop when i either open or close the trv so i presume it must be a bypass problem? I'm away from home at the moment but will check the hose under the floor & get back to you on Monday.

Ricarbo, Many thanks for your answer; I have checked as you said & indeed when you either open or close the trv the noise stops. I am a little unsure though how to adjust the bypass as by the looks of it is just bit of rubber pipe between 2 points under the floor, also i'm unsure if my combi...

I have the same problem but it only seems to be in 2 rooms that are welll away from the boiler. the problem seems to have started ever since we got trv's fitted on all the boilers & an extra radiator fitted, before then we couldn't hear the central heating system work at all. We did get one...