In an earlier contribution to this discussion,
wrote:

I'm told the boiler heat exchanger is partly blocked, laeding to the
flame coming out sideways, licking round the edges of the the
combustion chamber. Is there any way to confirm/deny this, as visually
I cant see anything? The exchanger itself is not visible.

Last time I saw it alight through the viewing window, it looked fine,
with rows of neat upright blue flames.


thank you,
NT

What colour are the flames - are they still blue - or are they yellow? If
the latter, there could be some crud in the burner rail, interfering with
the proper gas/air mixture.

Otherwise, it sounds as if either the heat exchanger is sooted up, or
there's a problem with the flue. What boiler is it?
--
Cheers,
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