RichK wrote:
Hi All,

With heating season starting in my area, I was changing the filter. Started
the furnace to check the flame. Flame on all 3 burners are blue for about
1-1.5 inch, but above that they are yellow. Furnace is 20 years old Lenox.

Is there are efficiency problem with the flames as described above?

A lot of times they will run an orange color if the furnace is dusty or
there's dust in the air around it, as that's what color the dust seems
to burn. Yellow color (like a candle or cigarette lighter) is the bad
one, though if it's burning orange a lot of the time, it likely needs a
cleaning..

--
Robert Hancock Saskatoon, SK, Canada
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