While running my heater, the fan continues to blow cold air even after the heater stops. I have to manually shut off the breaker to stop the fan. This does not happen when I run the AC. Flipping the breaker on the HVAC does not "reset" the fan. If I turn the breaker on again, the fan starts back up. Then I waited 24 hours and reset the breaker and the fan did not come on. As soon as I tuned the heater back on, the fan gets "stuck" on again.

Brand of furnace?

Exact Model number of furnace?

Brand of thermostat?

Exact model number of thermostat