Hi folks, Thanks for trying to help.
transam - I did get a service manual, and felt confident enough that I wasn't getting near any gas bits to get the boiler into fault finding mode, then back to normal.
The lights that were flashing were indicating that it was the fault - Lack of burner...
Hi folks I'm looking for some help and advice and this seemed to be the place to ask it.
I have a Biasi M90e 24S boiler that is 7 years old. It has been working fine until the last couple of months.
I'm not trying to 'do' anything with it myself, I'm an electrical engineer not a gas...