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Reducing Pressure Problem?

I've got an EcoTec 831 R-1 boiler, and the pressure always goes up when we put the boiler on - so we have to keep on releasing water/ pressure to keep it low again. How do i sort this problem out so i don't have to do this anymore?
A-1, December 2010
link Click here to see other fixes for Baxi EcoTec 831 R-1.