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i can turn the boiler off, and it still fires up for a time, but im getting hot radiators and when i turn a tap on the flame only lasts a few seconds and then cuts out. any ideas

hi im new to all this so please be gentle lol .im no engineer but my system has been slowly loosing presure over a couple of years ,and a few times ive tried restoring pressure using the filling loop,nothing happens .it used to gush water with no problem but the pressure has got so low its in...