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Mend Ferroli Optimax HE Plus 31c Boiler Wont Work

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

Ferroli Ferroli Optimax HE Plus 31c Heating, Home Heating Systems Boiler Wont Work

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

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Ferroli Optimax HE Plus 31c - F40 Error & Fix