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I first though it was a leaking heat exchanger but I have looked at it without the casing and there is no sign of a leak or flame flicker indicating water dropping on the flame and its not a steady hiss and sometimes stops It may be pressure related as it start as the boiler warms up and...

I have checked the tubes behind the heat exchanger and they seem ok I have a vent pipe in the attic and a header tank so I don't think I have a sealed system But it sounds just like leaking air in 2 short bursts at a time. I have printed out the data sheet and can't see anything in it that...

My 10 year old ideal classic boiler runs fine but shortly after starting I get a noise like leaking air which continues for a little while after the boiler stops . No water anywhere so I don't think it is a water leak. The only thing that happened recently is that I had a new fan fitted about a...