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Thank you John for the info, I'll discuss this with the person who did the work originally and the guy coming next week. It's definitely out of my capabilities to do the fix you suggest, but I can pass it onto someone who can, thanks again for the tips and help!

Sorry John, just doubled checked they're 2 ports. Apologies.

3 ports*

Understood re the radiators, It's the bottom one in the photos the 3 points. Thanks

I've edited the old photo, the green arrows are where the setting is currently on. It was still making a noise when I just turn the heating on. Don't know enough to answer your question around if I have a y system or s system I'm afraid Thanks

I've put it on the lowest pump setting for now which seems to have stopped the noise

So I've just gone back up into the attic where the tank and circulating Pump is, pump is making the expected amount of noise. I wonder if my original diagnosis was wrong as it now sounds like the noise is coming from the pipes in the ceiling, it's almost like an engine humming noise. I've tried...

It's a Worcester Bosch Greenstar 8000 Life, the temperature in the boiler says 62 degrees Celsius. Yes still getting the noise

Hi John, no don't believe so, radiators were only put in about 2 years ago as was boiler and everything as did a whole house refurb.

Just bled the radiators and pressure on the boiler is showing 1.2. I've got a guy coming over next week to take a look at it, so hopefully he can find out what the issue is then I can always post it in here if not resolved before then.

It's an unvented system

Thanks John we've got more than 6 radiators, 10 in total. So I'll change the pump speed to 3. Any thoughts on what the noise could be? I don't know how I can get rid of air in the system as this is a self regulating one, and doesn't have a mechanism on the side of it to let air out like others do.

Taken a couple of photos of the Circulating Pump below. Am I right in thinking that the settings are tied to the size of the property or not related? The noise is loudest when I set the pump to 3 and the far right setting then lowest at 1 and the far left setting. Thanks again for any help

https://www.bes.co.uk/circulating-pumps-cp50-high-efficiency-central-heating-pump-21136/ This is the link to it I believe, thanks

Hi John, thanks for the response, I've set it on the middle setting, I'm away with work, but should be able to post a photo by tomorrow morning, didn't expect such a quick reply

Hi Everyone, My Circulating Pump CP50 is making a loud noise. The noise only occurs when the hot water or heating is turned on. I'm making an assumption that there is an air lock in the system somewhere, it happened last year but eventually went away. As it is self regulating the only...