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Sounds like have left the filling loop open on the heating circuit side of the boiler so the water is going straight in the boiler and over pressuring and coming out of the saftey valve , as shaun said reduce the pressure in the system to 1bar through a drain point on a radiator , when the cold inlet valve is switched off via the valve connected to the braided hose it should allow cold water to enter only when the hot taps are turned on if not check the valve is in the right position, regards kop