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Mend Worcester Bosch 230 Combi Pressure

low hot water pressure and no hot water?

I have a worcester bosch 230 combi. I recently changed the pressure relief valve and expansion vessel. All was well until this morning. I turned the hot tap on and the pressure coming out is abnormaly low and it does not fire the boiler up on demand. Any ideas please.

Scott74
December 2010

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