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Gas Boiler: "Insufficient pressure in central heating system"?

When I reset the boiler, it tries to start for a few seonds but then gives up. A green warning light flashes. I've checked the manual and it says: "Insufficient pressure in central heating system".

The boiler is a Ferroli Modena 80 E.

Any help would be much appreciated.
Paul F, February 2007
are you still there paul f

frank, November 2012
it still operates as normal but after few times using heating preasure drops , but if not using heating preasure stays same

frank, November 2012
hi paul f , ive brought preasure up every time but it loses it while operating . was told could expanstion vessel but i replaced it 8 year ago . could it be same p[roblem

frank, November 2012
losing preasure dops as heating working

frank, November 2012
Thanks mate...

Paul F, February 2007
you need to bring the system pressure up to 1 to 1.5 bar using the filling loop

Pete, February 2007
link Click here to see other fixes for Ferroli.