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bring water pressue down on ferroli he 31 c?

how do I bring water pressure down on ferroli optimax he 31 c stupidly over filled it
shane, April 2014
From drain out fitted on system you have to look for drain water from system ,if no drain out fitted than air vent on radiator bring down to 1.2 bar

ltd, April 2014
link Click here to see other fixes for Ferroli.