When the motor on your furnace gets too hot or there is an interruption within the electrical system, a switch will trip causing the furnace to shut down usually before the circuit breaker trips. Most electric motors, including the furnace blower motor, have a reset switch that pops up when this happens. Often the problem corrects itself and it is only a matter of pressing the reset button to get the furnace going again. The key is finding the furnace motor reset button to push it back down.
Turn off the power to the furnace at the circuit breaker. The circuit breaker is clearly marked. There may also be a switch near the furnace that is red and looks like a light switch. Turn the switch off to ensure no power is going to the furnace.
Lift up the blower compartment cover to access the blower wheel and blower motor. Some blower covers use screws that require removal with a Phillips-head screwdriver. Lightly touch the motor housing with your fingers. If the housing is hot, allow the motor to cool before looking for and resetting the rest button.
Look for a small red or yellow button on the side of the blower motor. If you do not see one on the side of the motor that is facing you, feel around to the back of the motor housing for the button.
Press the reset button down if it has popped up. Place the blower compartment door back into place and turn the power back on to the furnace.