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How can I fix the pressure on my Baxi Combi 105e boiler?

Why does the pressure on the Baxi Combi 105e boiler keep dropping when the central heating is off but when heating is on the pressure goes above 3.0 bar and activates the pressure safety valve?
Jane Carnelly, January 2007
You need to get your expansion vessel recharged/replaced.

GasAid.co.uk, January 2007
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