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Hi Kirkyboy3 the system is an open vented system so there is nothing on the boiler that detects pressure. The system is not venting air it's sucking it in.

It does sound like kettling yes. I believe the power flush was done correctly so reckon the noise is caused by air getting into the system. The problem is I don't know where. With gas engineers having their busiest time of the year. I think I'll struggle to get someone to come for an indefinite...

Hi Ian, Thanks for responding. Could you elaborate about the hoses? The boiler is a Veissman Vitodens 100-W WB1B heat only boiler on an open vented system. Are you familiar with this type?

I apologise for the length on this post in advance. I have a noise that sounds like boiling water at the boiler a Veissman 100 WB1B on an open vented system. Once the boiler has modulated down after about 10 minutes or so it is a quiet as normal. There is no Magna clean (or equivalent)...