Possible Reasons Why Your Furnace Blower Runs Excessively

Alexandria, VA, homeowners often ask us why their furnace blower won’t stop running, even after the heater turns off. A functional blower runs for a minute or two before heating begins and for a minute or two after the heat cuts off. While the furnace is not running, the blower generally should not be running either. One exception to this is when you intentionally run only the fan to increase air circulation in your home.

What if the Fan Isn’t Set to Run?

In such cases, the furnace blower fan is usually not the problem. Rather, another component is malfunctioning and having an adverse effect on the blower. The source of the problem could be poor furnace maintenance, damaged wiring, a problematic relay switch, or a bad thermostat. All of these issues require professional heating repairs.

Poor Heater Maintenance

Thermostat problems caused by poor HVAC maintenance can cause a furnace blower to run all the time. Annual heating tune-ups that include checking the thermostat settings and testing and calibrating the battery prevent thermostat issues in almost all cases.

Dirty Air Filters

Clogged filters can limit system airflow to the point where no air gets through. Poor airflow can make the furnace overheat and cause components like the blower motor to malfunction.

Short Circuit or Broken Relay Switch

If the relay switch is broken or stuck, it cannot tell the blower to turn itself off. A short circuit or other wiring problem in the thermostat or near the fan limit switch can block those signals as well. If the relay switch is stuck, it might get unstuck a couple of times, but the problem will quickly return.

The blower might also run slowly or make clanking, rattling, or screeching noises. Those are all serious issues that can be prevented with regular furnace maintenance. Call the experts at Commonwealth Cooling & Heating. LLC before the issues can get any worse.

You May Also Like

Furnace Repairs in Alexandria, VA
January 8, 2024

Reasons to Always Invest in Furnace Repairs Right Away

Have you been putting off furnace repairs in your Springfield, VA, home because you think they’ll resolve themselves? If so, you could… Continue Reading Reasons to Always Invest in Furnace Repairs Right Away

Read More…

December 28, 2023

Steps You Can Take to Extend Your Heater’s Lifespan

According to Virginia.org, Northern Virginia has a “Goldilocks Climate.” It gets cold, but not too much. Nevertheless, your heater can work nonstop… Continue Reading Steps You Can Take to Extend Your Heater’s Lifespan

Read More…

Evolution Connex Control in Alexandria, VA
October 23, 2023

Learn About the Evolution™ Connex™ Control System

More than just a thermostat, the Evolution™ Connex™ Control is the brains behind one of the world’s most advanced HVAC ecosystems. Packed… Continue Reading Learn About the Evolution™ Connex™ Control System

Read More…

Compliance Settings
Increase Font Size
Simplified Font
Underline Links
Highlight Links