Dayton Furnace: Fan continues to run after heating cycle has finished or reached room temp.
That's the fan switch. It's a thermostat that controls the fan coming on and off, it's probably failed and needs to be replaced. You can see it if you take the front off the furnace, the wires come off it and go to the fan motor.
If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c
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