Quadra Fire 800 combustion blower

[GBTurkey]

I just bought a used Quadra Fire 800 Nova. When I plugged it in the combustion blower started and would not shut off without unplugging the power chord. It acted the same wether or not the thermostat was connected. I understand it is normal for the blower to start and run for 10-20 minutes when the power is first turned on. I let it run for over an hour and it did not shut off.
Any suggestions on trouble shooting would be greatly appreciated.

 

[kappel15]

Bad comb. motor or bad control box, would be my guess. kap

 

[GBTurkey]

Is it the control box that controls the start and shutdown of the cumbustion blower or is it controlled by some sensor? The blower runs smooth and quiet. Just won't shut down.