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QUESTION:My furnace was acting up last night. Would not kick in, flame was
yellow. I had to reset it many times. Eventually, it fixed itself -
flame bright blue kicking in first time of startup cycle consistently.
I called the heating guy to talk about this. He said another guy a
few blocks away from me has a furnace like mine and he had exactly the
same thing happen last night. The heating guy says that on rare
occasion, atmospheric conditions can adversely affect the air pressure
on the kind of furnace I have (a RUUD 90+). This is the first time
this has happened since I bought the furnace in 1993. I wonder
if there were any UFO sightings in the Omaha area last night? Maybe
this is comet related? Should I call Scully and Mulner? But
seriously, has anyone ever heard of this kind of furnace problem?
ANSWER: The only atmospheric condition I can think of that could affect
the furnace air pressure is wind. Wind entering the
the flue could affect the air flow in the furnace; also some
systems have a safety switch if there isn't the proper air
circulation in the system. You might be able to fix it with a
different height or cap to your rooftop flue stack, or maybe its
tipping slightly in one direction, or the wind was just the
right speed and direction to get in after flowing over other
rooftop obstacles.
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