How can I fix my Glow-worm swiftflow boiler?

My boiler keeps losing pressure when the heating is not on. I have drained all the air out of the radiators. Is there something I am not doing that is causing this pressure loss?

Thanks
Daniella Purnell, September 2006


done
poss pressure vessel losing pressure when hot water running. need to check blow off not passing.take blow off 'off boiler and blow through it if u can valve gone

paul, September 2006
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