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how can i get air out of system from glow worm condensing boiler 30 hxi?

the system keeps shutting down, and then no heating. How can I find air lock?
jeremy, November 2011
the system is non pressurised, any ideas please? Thank you

jeremy, November 2011
has the boiler got the correct bar/water pressure in the system?.the boiler will not function if the pressure is less than 1bar.top up to 1.5 bar if less then 1bar.

mech monster, November 2011