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water pressure drops?

We have a Worcester 28CD gas boiler. It repeatedly loses all pressure. We refill, bleed the radiators and for a while its OK then the pressure just drops again. I anticipate this is not a DIY fix, but would like some clues as to what may be the cause
Jenny G, September 2011
change over flow valve also call pressure relief valve you can do it if your engineer technical minded drain out system

ltd, September 2011
link Click here to see other fixes for Worcester.