replying to Paul Franklin, Jim wrote:



pffranklin.nospam wrote:

As Greg said, try a different service tech.
You are getting a build up of gas before the pilot ignites the main
flame, and there are several possible causes.
I assume you have a standing (always-on) pilot? If not, you may have
a problem with your flame safety.
In any case, the tech should look for clogged burner holes in the area
of the pilot, misadjusted pilot, mispositioned pilot, and excessive
draft. In addition to cleaning the burner and orifices, they should
remove and clean the pilot assembly, since a partially clogged pilot
can reduce the pilot flame size enough to also cause this.
But get it fixed, those little explosions are hard on the furnace.
HTH,
Paul


Just Repaired mine. and was this: A misaligned pilot.



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