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Vailant ecoTEC combi boiler - reducing water pressure?

In the process of increasing the water pressure, as it had fallen, a valve was knocked and the water pressure has risen to 3.3bar

How can I reduce the water pressure?
Anthony Smoker, October 2009
easiest user way is to open a radiator bleed screw and patiently fill a tub

ste, October 2009