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Mend Ferroli Optimax 25C Boiler Overheating

ferolli optimax 25c f3 code?

can any one help my ferolli will pump out hot water all day long but as soon as you turn the tap or shower off it overheats and gives the f3 code. and it does seem to dump the water into the rads as it should can any one help

dan
February 2010
FerroliFerroli Optimax 25CD.I.Y, PlumbingBoiler Overheating Ferroli

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Ferroli Optimax 25C F3 Error - Help & Fixes