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Thought I had sorted earlier in the month through help from this site-alas not. De scaled and flushed CH system until it ran clear. Re-filled with inhibitor/vented everything and now working loads quieter. However still getting hot water venting into header tank every 5 mins for about 20...

Had trouble with the boiler bumping and banging over the last few months so I partially drained it today and added some de-scaler. The water in the header tank was warm but I thought it was just heat bleeding back up from the cylinder. I've just been up there again since putting the gunk in the...