orite steve sound like your expansion vessel needs recharging open your blow off valve left hand side near top its red turn it and it will stay open on its own then connect foot pump 2 expansion vessel and pump it 2 1 bar then re- pressureise system 2 1 bar this should sort it oh and worcester 400 are shocking wait till your plate 2 plate goes hope youve got access 2 the left hand side
big eng
March 2009