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boiler wont work ?

my boiler wont work its a ferroli optimax he plus 31 c it just flashes f 40 on the screen what is this? nothing in manual
grant, August 2010
From the manual (where it doesn't exist) :o))
F40 Incorrect system water pressure
Pressure too high above 3 - 5 bar
Check the filling loop not passing

Carefree, August 2010
link Click here to see other fixes for Ferroli.