how do I fix my feroli modena 106?

I have not got an answer but we are having exactly the same problem although it appears to be intermittent. Sometimes it works for hours with no problems and then other times it cuts out every few seconds.

We have had an engineer in twice who has changed the temperature sensors and something called a Ventura and a flue restrictor (both made of plastic) but the problem persists. Any ideas out there? Sue

Sue
March 2007