How to Test the Motor Draft Inducer on a Gas Furnace


The motor draft inducer in a gas furnace causes the fan to run, pulling in air to send through the vent pipe outside the home. If your gas furnace is not venting properly or if the fan is not working, you may have a broken motor draft inducer. You can test the motor part to see if it needs to be replaced by checking the voltage being sent to the motor, which will help you determine whether it's an electrical problem or if the motor is malfunctioning.

Things You'll Need

  • Volt ohm meter
  • Turn off the electrical power to your gas furnace from your home's main circuit breaker.

  • Lift up and remove the upper access panel on the furnace. The motor draft inducer is on the bottom right corner of the furnace.

  • Disconnect the wire switch connection from the motor, which should be a plastic piece connected to the wires that you can simply pull apart with your hands.

  • Connect a volt ohm meter to the end of the wire connector. Check the reading on ohm meter, and the reading should be near 120 volts.

  • Disconnect the ohm meter from the wire connector. Touch the top of the motor to see if it is warm. If the switch connector tests at 120 volts, the motor is not running and the motor is warm, you should replace the motor.

Tips & Warnings

  • You can order and purchase a new motor draft inducer from the manufacturer of your gas furnace or from an online retailer.

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