Thank you for your extremely helpful comments. The engineers who have been studying the problem are fully qualified, competent and very experienced. Potterton have spoken to one of them and, while Potterton can't help or advise because we're not in the UK, they have admitted they are also...
That's exactly what I was hoping to hear, however the regulator was changed right at the start when that message appeared and the gas supply has been tested a number of times, always reading safely above minimum, and still no joy.
It gives the fault code 133, which is supposed to mean a problem with the gas supply, but that's been tested and is apparently fine. Yes, we have spoken to Potterton but upon hearing the boiler is out of the country they will not speak to us - pretending it's in the UK doesn't help either...
Fitting the other boiler in its place is about the only thing left we can think of, but I was hoping for a simpler suggestion first! It's a new installation, so no other boiler has been used there. I wasn't there myself when the analyser was used but I've been told all was as it should be. And...
The boiler will stay lit for between 5-20 seconds before cutting out. One pattern noticed is that when it's being tested or checked, it starts off cutting out within about five seconds. Keep trying it and it will go up to 20 seconds eventually, but no longer than that.
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