Hey folks. I'm at my wits end and sure could use some advice. I have an older Suburban Dynatrail Furnace, NT-30M. It starts perfectly, fires and heats like brand new. When the temperature is reached it promptly cuts off the burner and then the blower continues to run, and continues to run, and continues to run, and continues to run, and......(you get the picture). Today I just spent $125 on a new Dinosaur board and replaced the old original board. I must say it starts and runs better, but the blower fan still doesn't ever shut off after the temperature is reached. When I say never shuts off, I mean like an hour later it's still running. I don't understand what the problem is. I assumed it was the board and that's why I replaced it. This unit does not have a separate fan-control relay. Could it somehow be the wall thermostat? I don't understand why that would be. I know some of you will say to just replace it, but it works great otherwise. I recently cleaned the burner out and it seems solid as can be. Help, help, help.