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I have had it repaired now. It was nothing to do with the pressure. It was something inside the boiler to do with having the heating and the water on at the same time but Im not sure what! It was corroded and had to be replaced.

I have a Potterton 30 HE combi boiler. I bled my radiators a couple of days ago but today I have plenty of hot water as usual but no central heating, radiators are stone cold. The operating pressure should be between 1 - 2 1/2. It was on 1 and I since found out that I should have topped the...