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How to Replace an HVAC Fan Motor

Views: 2     Author: Site Editor     Publish Time: 2023-06-14      Origin: Site

If your HVAC system's fan motor stops working, your HVAC system won't be able to work effectively. In this article, we'll cover how to replace an HVAC fan motor so that you can get your system back up and running.

Understanding the HVAC System Fan Motor

Before getting started, it's essential to understand the fan motor's role in your HVAC system. The fan motor's primary job is to push air through your HVAC system's air ducts to provide your home with heating or cooling. There are two types of fan motors: blower motors and condenser fan motors. Blower motors are responsible for moving air through the air handler and into your home, while condenser fan motors move air through the outside unit's condenser coils.

Signs That Your HVAC Fan Motor Needs Replacing

Before you begin replacing your HVAC fan motor, it's important to know what signs to look for that indicate that your HVAC system's fan motor is failing. These signs include:

  1. The fan is not turning on when the HVAC system is running.

  2. The fan is running slowly or not running at full speed.

  3. The fan is making strange noises, such as screeching or grinding sounds.

  4. The fan is vibrating excessively.

  5. The fan is overheating.

If you notice any of these signs, it's time to replace your HVAC fan motor.

Preparing to Replace Your HVAC Fan Motor

Before you get started, you will need to have the following tools and materials:

  • Replacement fan motor

  • Screwdriver

  • Wrench

  • Pliers

  • Wire stripper

  • Electrical tape

  • Voltage tester

It's also essential to turn off the power to your HVAC system before starting to replace the fan motor.

Step-by-Step Guide to Replacing Your HVAC Fan Motor

  1. Locate the fan motor. The blower motor is usually located inside the air handler cabinet, while the condenser fan motor is located outside in the condenser unit.

  2. Disconnect the power. Use the voltage tester to ensure the power is off before disconnecting the wiring.

  3. Remove the fan assembly. Unscrew the bolts or screws holding the fan assembly in place and remove it from the HVAC system.

  4. Disconnect the wiring. Remove the wire nuts and disconnect the wiring from the old fan motor.

  5. Remove the old fan motor. Loosen the bolts holding the motor in place and remove it from the HVAC system.

  6. Install the new fan motor. Position the new fan motor and tighten the bolts holding it in place.

  7. Reconnect the wiring. Strip the wires and connect them to the new fan motor using wire nuts. Cover the connections with electrical tape.

  8. Reinstall the fan assembly. Put the fan assembly back into place and tighten the screws or bolts.

  9. Turn on the power. Once you've finished installing the new fan motor, turn the power back on to the HVAC system and test the fan to ensure it's working correctly.

Tips for Replacing Your HVAC Fan Motor

  • Always follow the manufacturer's instructions for your replacement fan motor.

  • Use caution when working with electricity. Make sure to turn off the power before beginning any work and use a voltage tester to ensure it's off.

  • Take photos of the wiring before disconnecting it so you can remember how to reconnect it.

  • Label the wires before disconnecting them so you know where they go.

  • Double-check all wiring connections and tighten all bolts and screws.


Replacing an HVAC fan motor may seem like a daunting task, but with the right tools and knowledge, it's a manageable job. By following the steps outlined in this article, you can get your HVAC system back up and running in no time.

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