Im having some problems with my furnace. It is firing up and burning for about 5 mins and shutting down. the read out on the mother board is "thermal protection device open". I thought that because the furnace was heating up but the blower wasnt kicking on that maybe the furnace was overheating. So i pulled the motor and tried to find another with no success, but im really not sure that the motor is bad. I also checked to see if i was getting power to the motor and i read 124 volts to the motor. I would appreciate any input as I am rather a novice.