My furnace worked fine last Thanksgiving. Made a little trip this week and it got down into the 30's. Turned on the furnace and here is what happened: Blower turned on, I heard the burner ignite, ...
I had to reset my limit switch do to no air flow. My ducts were squashed almost shut. Had to revamp my plenum so I could get better air flow. Cheap little card board boxes they use with 3 4inch pipes. Works 100percent better now