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I hope it is as simple as that and I will try again tomorrow, I am pretty sure that there was plenty of water in the expansion tank by the time I had completed by bleeding - I kept topping up during the bleeding and only stopped topping it up once I was nearly finished bleeding - i.e. only a...

That's a fair comment, I will do it more scientifically tomorrow. All the radiator pipes are in the walls.

No, I have left the isolation valve closed, because I assumed I had filled the system, bled the air and therefore I could close until I replaced the ball valve. It would currently go to the overflow - as the ball valve doesn't shut off most of the time. Yes, the big cold water tank is higher...

Thanks - I agree, but other than that I am stuck on what causes it :(

Hello everybody, Long time reader of the website, and now in need of some help, so thanks very much in advance for anybody that can help! I finally thought I was on top of my DIY, but my central heating system is playing up. And I have very limited knowledge of central heating systems. I...