I am a corgi reg engineer, and have been to a linea 28 today, with exactly the same symptons as yours .
After approx. 1 hour I found the fault, a small pin hole in the heat exchanger, on the right hand side of the combustion space. If your boiler is non condensing, the boiler is now obsolete as it is not worth repairing as the parts and the repair will cost you about £4 - 500, due to the full rebuild required. It can be done cheaper but I doubt that you will get any sort of guarantee.
MikeBowen.
May 2008