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How can I fix my Saunier Duval Boiler ?

I have error code F9 on my Saunier Duval Thermoclassic F30E SB boiler. There is no heating or hot water. Can anybody tell me what the problem is ?
Gillian, May 2010
f9 is a pressure fault

hadi, November 2013
link Click here to see other fixes for Saunier Duval.