Thanks for your kind encouragement, Tony, its my first venture onto a forum like this and I'm very impressed. We have our own Gas Board (Bord Gáis) who run things here - I had never heard of CORGI before.
The plumber who did the job for me was a friend who was trying to do me a favour. He admitted from the start that he wasn't familiar with my boiler and I think he's sorry he ever got involved. I'll get him to come out again to have a look but he seems to be baffled.
As I said in an earlier post, he was able to demonstrate to me that very little gas was going through the gas valve before he replaced it. Unfortunately, I wasn't around the day he replaced it, but I assume he used the same procedure to check it was working OK. The boiler wasn't firing up at all before he replaced it.
Just to wanted to let everybody know that the problem has been solved.
Plumber called on Wednesday and identified what was wrong. Main injector (not the pilot injector) was blocked with a build up of graphite. He showed me the small pieces of carbon that came out of it.
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