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ferroli optimax HE 31C combi boiler?

my boiler will not fire up it just starts the fan then goes on to F12.
What is F12 fault
tobyjug 16, May 2011
youve got a perameter set wrong in the engineers codes on perameter 2 .if you change it it should work as normal.if your stuck fone me 07807776411

ex ferroli engineer, June 2011
I am sure f12 fault is a fault on the pcb..

steve, May 2011
link Click here to see other fixes for Ferroli.