According to the diagnostic I neeed to make sure the cap on the automatic air vent is loosened - I have the manual - I have searched the manual! there is no diagram as to where this is and no real reference to it, although at another point it does state: loosen the cap on the pump AAV - cannot see anything obvious ont he pump either!

Sarah J, March 2008

ok im not fam. with the particular boiler but this much i know for def..the auto air valve will always be at the highest point or the contrapction and will probably involve removing the front casiing and climbing a steps to inspect the top.loosen it carefully if you find it until water tricles them tighen gently til water stops.them are notorious for bitching.

mark, March 2008

The AAV is part of the pump, it is situated on top of the black plastic part of the pump rear, to the right hand side.

gary.wright53@googlemail.com, March 2008