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How can I increase the water pressure to my Ferroli Optimax HE31C boiler?

My boiler is showing an F37 fault. I've located the water pressure gauge and the black valve underneath it. When I open this valve nothing happens. There is another black valve at the front, to the left of the gauge but this valve won't turn. Does anyone have any advice\tips that might help?

Sue
September 2012
FerroliHeating, Home Heating SystemsPressure Ferroli Optimax Boiler

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