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Yes water did come out of the rads when I bled them, do you mean connect hose to drain point to back feed?

I have a vented CH system that with some rads not working well. I drained the system so that I could add some chemicals to flush the system, how ever the header tank did not empty. I have bled the radiators but now I have no central heating or hot water working at all. Any pointers would be most...