how can i fix my ferroli optima 700?

my optima 700 was working fine,then no hot water or heating.
checked pilot it was out,went through ignition procedure,fan started up,pressed ignition button and nothing,no clicking from igniter.can anybody help.
geoff, February 2007


done
ferroli optima 700 hot water works no central heating

keith, February 2014
poss pressure switch

g lloyd, March 2007
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