I presume you are talking about the heating system, If you have over pressurised it yourself then you could either attach a hose to your drain off point, or use the boiler pressure relief valve (not too sure about this particular boiler but usually a red knob inside the casing with a pipe attached which runs to outside). Turn the knob to its open position, spring pressure will try to close it. The preferable way is the drain off point. Hope it helps. If it is building up pressure itself then it will need looking at.
Carl, September 2008
