Hi jane I had the same problem with a jaguar boiler what I found was if the pressure is ok above 1.2 bar and keeps coming on and off try the multiplug on the pump that is on the right hand side ,it was a loose connection and we thought the pump was actually running but it was only the vibration from the extract fan ,when we asked at all technical help/support they tried to sell us a gas valve ,they are well known for bad connection on the multiplug to the pump ,it worth a try ,you only have to lift off the front cover and give it a go ,darren if not call me 07930103068
darren, February 2008
