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F37 ferroli?

I have f37 fault showing on my boiler but when topping up the pressure back to between 1 &2 it's fine for a wile then the pressure goes way up and over flows bringing the pressure back down to 0 and turning of any suggestions
Jason j, November 2011
change expension vessel or pump to 2 bar with car pump its at back of boiler red or grey colour its heart
of all combi

ltd, November 2011
link Click here to see other fixes for Ferroli F37.