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Many thanks. I've found that pipe but it doesn't look like any water has come out of it in a long time. But I'll keep an eye on it if / when the noise happens again. If there is water coming out of it, what does that mean? Pressure going to high in the system which could be caused by pump?

I popped x400 in it a while ago, as I thought it might get ride of it. Did a couple of flushes too. When the first engineer did the boiler service, it was full of crap but he cleaned it all out. Could it be a fault fan? Or I thought with the change in volume of fluid in the system with increased...

Many thanks for the reply. I'm not gas qualified, hence not actually doing anything inside the boiler. Just wondering if there is anything that I can do, to make the noise happen/test each part so that actual gas guy can change it. I have had two guys around already and they are both stumped...

Hi all, I bought a 1950s bungalow a couple months back and have been slowly renovating it. One of the first things I did, was to redo all the pipework from the boiler to all rads, and replaced all the radiators. The boiler itself is a Bosch boiler which is around 7yrs old. Seemed fine when I...