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Mend Ferroli optimax 25s Boiler F5 Error

how can i fix?

ferroli optimax 25s, boiler keeps cutting out, the code f5 is flashing up on the boiler display

gavin
October 2009
FerroliFerroli optimax 25sHeating, Home Heating SystemsBoiler Ferroli F5 Error

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Ferroli Optimax 25s F5 Error - Fix Guide