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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 Bosch 28CDI.