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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
FerroliHeating, Home Heating SystemsFault Pressure Fine
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

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