Thanks for the reply Paul when I see the engineer next I'll ask whether he's considered the expansion vessel. I remember he did say that the pressure relief valve was intact.
Hello
We had an alpha CD24S condensing boiler fitted January 2006 and have been very pleased with its performance until a fortnight ago.
The previous week I'd topped up the pressure as the boiler didn't fire up in the morning - something that's been very occasional.
We noticed at night...