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ferroli f24 heating boiler low water pressure problem?

i have a ferroli f24 it funtions well but i but now have a problem the water pressure drops below the 1 bar after switching off by time or demand i then bring it back up and it funtions normally the pressure rising to3-4 bar but dropes to below 1 bar on satisfaction. and the problem remains. what is the solution. i am an old 77! years former corgi man but this one beets me.
is this an expantion vessel problem?.

robert fyfe
March 2012
FerroliHeating, Home Heating SystemsBoiler Low Water Pressure Problem
Expansion vassal need to recharge ,need to empty the system

ltd
March 2012

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