Goodman Furnace Blower Speed Adjustment

To have your furnace work at its maximum capacity, you need to adjust it to the right blower speed. Follow these steps to get started with the Goodman furnace blower speed adjustment.

All Goodman furnaces ship as high-speed cooling and medium-speed heating. The installer must adjust blower cooling and heating speed as needed (about 400 cfm airflow per ton when cooling is desirable). Goodman furnace blower speed can be adjusted to receive temperature rise within the range specified on the rating plate.

Why would you adjust the blower speed on a goodman furnace? There are many reasons you may want to change the blower speed of your furnace, such as:

  1. To increase/reduce the warm airflow
  2. To quiet your furnace
  3. To increase the efficiency

If you find your home is a bit cold, you may want to increase the furnace blower speed to improve airflow. You can also decrease your blower speed to quiet the unit if your furnace is too noisy.

How to Adjust the Blower Speed on Goodman Furnaces

If you know what you are doing, it is very easy to adjust the speed of your Goodman furnace. There are only a few steps required.

  1. Turn off the power source that is connected to the furnace blower.
  2. Access the control board.
  3. You need to find the wires that determine blower speed inside your furnace.
  4. You have to switch the wires to the blower motor.
  5. The wire’s color will determine the speed settings that the motor will run at. Typically the colors are:
    • White = neutral speed
    • Red = low speed
    • Yellow = medium speed
    • Black = high speed
  6. Attach the wire that is articulating the speed you want.

A Goodman furnace blower speed adjustment is generally not a DIY task. It should be done by a professional. They know the required airflow needed within the system.

Adjusting the blower speed is a temporary fix and could cause damage to the motor if the main issue is not addressed. A properly working furnace needs to be sized correctly and installed correctly to get the proper airflow.

I hope this helps you adjust the Goodman furnace blower speed. Be sure to check out the wiring diagram in the manual.

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About Mas Broto

Have been in the heating and air conditioning (HVAC) industry for over 20 years. He is person that will grow and thrive to learn more about the HVAC industry throughout his career. Mas Broto is also a blogger, who's dedicated to bringing you the best knowledge to get ahead in the game of life.