If the blower fan does not work in the "fan only" mode (or any mode), does it necessarily have to be replaced or could something else be wrong?

Comfortmaker furnace problem. Model# NTVM125KNB2 Initially, the blower would run constantly whether in cool,heat or off mode, Auto fan or manual-blower ran 24/7. I changed the batteries in the tstat, powered the unit down at the breaker, cleaned the filter, reassembled the stat, turned on the...

My 15 yr old Bryant 394GAD gas furnace started this fall by doing everything OK except that when the burner clicked off, the blower would cycle off and on 2-4 times before shutting off completely. Now the problem has progressed to where the blower won't shut off at all after the burner is shut down...

I have an old (14 years ?) York Stellar furnace that used to have this problem sometimes. When the gas was released over the red glowing electric igniter, it would ignite with a more or less loud pop that would also kill the flames. Then it would go again through the whole sequence and everything...

Why would my furnace kick off and say limited cycle on the code ?on a coleman evcon