Is the expansion vessel the little round ball with the car type valve on the top, or is it the big orange tank right at the back of the boiler?

Angela, May 2008

its generally pretty big and red also with a car valve on it. :-) the small brass one with valve on probably auto air vent.

if you can find the valve on the vessel (the big orangey red one), remove the cap and press the pin in. if you get water out generally its had it. if you get nothing out, no water or air, it may just need recharging.

iain, May 2008