Have HVAC Questions? Ask an HVAC Expert for Answers
1. Look inside furnace and give me model number
2. Does unit heat properly except that main fan keeps running after thermostat is satisfied?
Issue is going to be the relay is sticking that conrols the fan.If your furnace has a control board the relays are built into board and you will need to replace board.
am unable to take phone call right now. This will be presented to my colleagues so you may get a call from one of them if available.We can continue here to try to solve your problem.
Absolutely. Disconnect the R wire at thermostat and see if fan goes off.