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banging boiler?

I'm having a mare with my worcester 28cdi. When we call for hot water, it fires up fine. But after a minute it starts banging and rattling, it then cuts out. the pressure also drops.
Any ideas.
Craig, March 2008
that will be a blocked plate heat exchanger ... engineer will be req

matt the boiler man, March 2008
could be the pump,but the same would happen when you put the heating on ?

combiking, March 2008
sounds like the heat exchager could be cloged up possibly a descale

richie, March 2008
could be air in the heat exchanger
or the water is'nt cirulating fast enough

b, March 2008
link Click here to see other fixes for Worcester.