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Mend Ferroli F30 Combi Boiler Water Pressure Expansion Vessel

Water pressure?

My Ferroli F30 combi loses water pressue, despite refilling using the fill loop the pressure guage will read zero after a couple of days, Yet when the system is pressurised to 1 bar and is started up the guage will read 3+ bar after about 20 mins. I have checked for leaks - none- is wter bing boiled off and how does noe pressurise the expansion vessel

Mike Gittins
February 2009

Ferroli Ferroli F30 Heating, Home Heating Systems Combi Boiler Water Pressure Expansion Vessel

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Ferroli F30 Combi Boiler: Low Water Pressure