I think you are asking how to increase the pressure in your system so that it will work! Somewhere you will have a 'filling loop' that connects the mains pressure cold water to your heating system. Your pressure gauge presumably is reading below 1 bar and needs to be between 1.5 and 2 bar. On some systems you have to connect a short filling loop to two 'taps' and then open both taps to increase the pressure. On others the loop is permanently attached and you just open the valve until the pressure is correct and then close it again. Hope that helps
Richard, January 2009
