Posted by freddie mac (148.65.227.75) on February 24, 2008 at 00:44:40:
In Reply to: Furnace puffing posted by Duong Pham on February 20, 2008 at 15:51:33:
I suspect that you have a build up of fuel in the chamber that is not being properly purged before your igniter lites off. It would occur at night because the chimney is cooler, and you don't have the flow of warm fumes to flush out the bottom of the furnace. Does it happen to be located in some sort of pit or something?