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How do I reduce the water pressure in my Greenstar 28i bolier?

I had a frozen condensation pipe which I've now fixed, but my water pressure gage is at 3. I know how you increase the water pressure but HOW do you reduce it?
Dave, January 2010
open the drain to let some water out or bleed a radiator until the pressure drops.

Ian, January 2010
bleed from rad

avs, January 2010
link Click here to see other fixes for Greenstar.