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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
FerroliFerroli Optimax HE Plus 31cHeating, Home Heating SystemsBoiler 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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