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How can I fix it?

I have a potterton Profile 50e.It comes on for a few minutes ,then makes a terrible noise in the pipes and stops.How can I fix it?
Luaheen, January 2010
unlikely that this boiler will be on a sealed system, so i'd be checking the pump, sounds like the water isn't circulating.

Ian, January 2010
charge up the sys with water - sounds like water pressure low -refer to manual

eddie, January 2010
link Click here to see other fixes for Potterton.