Furnace Blower Motor Troubleshooting and Replacement Guide

A blower motor plays an integral role in furnace systems, it is responsible for turning a fan to circulate that conditioned warm air out of the furnace and throughout your home. It’s up to this device to ensure that your home reaches the temperature set on your thermostat.

With the blower motor being an essential part of your furnace system, you cannot afford to have it unoperational especially a few weeks going into winter. The good news is, most often than not, your furnace blower problem is often something you can easily fix yourself. So save some few extra bucks, we’ll walk you through troubleshooting your Furnace Blower Motor yourself at home.


CHECK THE POWER/ CIRCUIT BREAKER. Before any troubleshooting, make sure that your furnace is able to receive power.

CHECK THE POWER. The power may be unavailable due to an electrical outage or a power surge that may have caused the circuit breaker to trip.

CHECK THE CIRCUIT BREAKER. If the circuit breaker is tripped, reset it and allow time for a normal heating cycle.

CHECK THE THERMOSTAT. Set the thermostat appropriately, it must be set to at least 3 to 5 degrees above the current room temperature.

CHECK THE FILTERS. Filters must be maintained properly and replaced regularly. A clogged filter can obstruct airflow which may result in your furnace to overheat without sending any heat at all.

Dirty Furnace Filter

Has it been 3 to 6 months since you last replaced your filters? Do yourself and your home a favor, purchase a furnace filter today.

Still, no luck?


Dirty Furnace Blower MotorCHECK FOR DIRT AND DEBRIS. Over the years, dirt and debris can accumulate and build-up over your furnace blower motor that can cause it to overheat. Your furnace blower motor must be cleaned regularly for the motors to operate properly and your furnace to improve its product life.

CHECK FOR BLOWER MOTOR AND FAN MOVEMENT. If these parts do not spin properly, add some oil and see if it worked. If it still fails to turn, it must be replaced by a new furnace replacement blower motor.

CHECK THE AIRFLOW. Cool but steady air means the problem is not in your furnace blower motor, but in the heat exchanger or burner.

CHECK THE BURNER. The furnace flame must be blue, if otherwise, clean the burner for dirt and debris.

CHECK THE HEAT EXCHANGER. Check for cracks and purchase a replacement furnace heat exchanger as soon as possible. Cracked heat exchanger can cause major safety issues.

CHECK BLOWER FAN. Turn off the furnace and set your thermostat to “fan only” mode. If the fan does not turn on, there might be a tripped wiring or circuit breaker or motor problem.


When all else fails, and your blower motor persists to work sporadically or not work at all, URGENT REPLACEMENT.

Removing The Old Blower Motor

  • Before disconnecting the wires, take note of each wire color and where it is connected.
  • After disconnecting all the wires, remove the nuts and bolts of the blower assembly (blower motor and the fan) to pull it out of the furnace.
  • Disconnect the blower motor from the fan. Do this by loosening the holding screws that attach the blower motor to the fan wheel. Then remove the mounting bolts that attach the blower motor to the assembly housing.
  • Now, detach the mounting bracket from the blower motor
    • Take note of the blower motor’s orientation and position on the mounting bracket.
    • For built-in mounting brackets, you will need to purchase the exact correct part.

Purchasing The Correct Blower Motor

See our long-list of industry-leading furnace replacement blower motors or contact us with your furnace model, serial number, and manufacturer parts availability so we can recommend the perfect blower motor for your home furnace.

Replacement Furnace Blower Motors

Installing The New Blower Motor

  • Follow the removal steps in reverse noting the following:
    • The fan wheel must be centered within the assembly housing.
    • Check the correct rotational direction for the blower motor and the fan.
    • Secure extra wires using wire protectors and electrical tapes.
  • Turn the power back on. There must be no unusual noises and your furnace must start to work back to normal producing regular warm airflow.

See, a furnace blower motor usually do not drop dead, they will give you a warning, but you have to pay attention to it. Preventive maintenance is still always better than having a complete failure.

For all your other HVAC needs, acehvacparts.com offers high-quality HVAC replacement and original equipment manufacturer parts and supplies for do-it-yourselfers fast, convenient, and affordable. If you have any further questions or concerns about your furnace blower motor or any HVAC parts per se, contact us and we will be very eager to help you out.

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