I've had a plumber flush through my 20 year old oil fired central heating system [which has always been reliable] & refill with inhibitor. There is a lot of 'rushing' 'running' 'pouring' water noises sometimes now, around the pump/valve area, when the system is working. It sounds like air to me. The plumber [local, reliable?] has come back, scratched his head & walked away trying to tell me it's normal admitting he has no idea what's causing the noises!
I do have a 10 bar vent device fitted beside the cylinder, which appears to be working; I took it apart & cleaned it, there is an occasional slight hiss as if some air is coming out. The radiators are bled regularly & there is no air in them. I'm a bit stumped; any ideas please as to what may be wrong?
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!