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Loss of pressure?

I have a Worcester Hiflow 440cdi boiler. Hot water is fine but the pressure has dropped on the heating side due to bleeding the radiators and I cannot find how to top the boiler up.
John Sheppard, November 2011
It's under the boiler key like to open not easy to do my advice to replace with filling loop connect to easy access

ltd, November 2011
link Click here to see other fixes for Worcester Hiflow 440cdi.