Hi all. I have a worcester 240 combi boiler that was fitted about 13 years ago.Been good up til now.I have an intermittent problem with the boiler shutting itself off. This is what happens when i try to get it started again: There is a sound of 'turbulence" from the boiler (like a build up of pressure i guess) and then it clicks off and outens the pilot light. I solved it for a while by tapping a couple of pipes that run by the side of the combustion chamber.But the whole boiler goes out!! Any advice as to what it could be. its gettting colder!!