Damp crawlspace causes puffback?
Posted by Sal on September 15, 19100 at 16:17:08:
Early A.M. after rainstorm, oil furnace in crawlspace had puffback. Dirt crawlspace damp, no standing water, no leaks. Pback occurred during 2nd call for heat in cycle, not immediately at 1st call for heat. Dampness a factor for pback? Chimney a factor for pback? Furnace serviced annually.


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