I have just changed 2 radiators and re pressurised the system to 1 bar - Baxi Bahama 100 Combi Bolier. When I 1st put the heating on I could hear a lot of water / air moving around in the boiler, the boiler would fire up for about a minute then shut down. The boiler is also doing the same for the hot water.

Please can you advise, I presume there is air somewhere within the boiler so it shuts down rather than overheat. Is it the expansion vessel, pump or heat exchanger? I would be very grateful for some feedback. Many thanks

Mark, March 2008

if you have the manual for your boiler it should show you if there is an auto air vent on your boiler that should be open.
you could try putting the heating on and increasing the pressure to about 2 bar with the heating on, this will normally clear the air then bleed the rads this should then reduce the pressure again

gary.wright53@googlemail.com, March 2008

i would go bleed your rads again & repressure the boiler , try 1 1/2 bar

mike151, March 2008