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Mend Worcester 28 CDI Plumbing

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Mend Worcester 28 CDI Boiler Pressure Leak

loss of pressure?

I have a worcester 28 cdi combi boiler, if the bolier is left cold the pressure holds ok. If i put the heating on for 2 to 3 hours, then turn if off and leave the boiler cool down, the water pressure drops to zero. I cannot find any leak anywhere on the heating system, or the boiler. Can anyone please suggest what the problem might be

Ian
November 2009
WorcesterWorcester 28 CDID.I.Y, PlumbingBoiler Pressure Leak

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