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I changed the flame sense but teh problem still persists. The furnce cycles just as described in the very first post by burnin, and yes, eventually heats the house after several aborted start up cycles. The cycles are very consistent, to the point of the main burner firing up for about 5-10 seconds before a quick flame out, just as though it was shut off.
Any thoughts on this, I am thinking the main circuit board might need to be replaced, this one is the older relay style unit.
Thanks for any suggestions.
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