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chaffoteaux boiler pressure keeps rising?

pressure keeps rising over 3 bar sometimes upto 4.
had filling loop replaced and heat echange but has not fixed problem.chaffoteaux sterling ff aprox nine years old

s mankowski
January 2007
ChaffoteauxChaffoteaux Sterling FFHeating, Home Heating SystemsBoiler Heating Chaffoteaux
the diaphragm is probably punctured

grijzehond
February 2009
Drop the boiler water pressure to zero .using a foot pump increase pressue in pressure vessel to 0.9 bar .reduce boiler water pressue to zero if it increases.when pressure in pressure vessel is 0.9bar and boiler water pressure is zero,increase boiler water pressure to 1.2 bar .bleed the radiaters.

Pravin
January 2007
expanssion vessel is the problem

hi-spec plumbing
January 2007

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Chaffoteaux Sterling FF Boiler - High Pressure