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how do I increase water pressure ?

I cant turn any of the valves wh8ch ones should I be turning the book says B then a but I cant turn them
Its a saunier duval
Pam, March 2012
its a blue round dial it normally located on the right hand side and between the middle of the boiler. look under the boiler u should spot it

kash, March 2012
link Click here to see other fixes for Saunier Duval.