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Table of Contents

Why Your Air Conditioner Fan Won’t Run

DIY Steps to Troubleshoot a Non-Working Air Conditioner Fan

Preventing Air Conditioner Fan Problems

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3 Easy DIY Tips to Fix Your AC When the Fan Is Not Working in 2024

5 min readUpdated Mar. 28, 2024Lyle WeischwillHVAC
3 easy DIY tips to fix your air conditioner when the fan quits blowing.

Living in a hot climate, you know how vital your air conditioner is. So when the fan stops working, it's not just a minor inconvenience; it's a major issue, especially during those sweltering summer months. But don't sweat it just yet. We're here to help you understand why your air conditioner fan might quit and how to get it back up and running.

We'll walk you through some common reasons for fan failure, show you some troubleshooting tips, share some preventive measures, and advise when it's time to call in the pros. We'll also highlight the benefits of professional air conditioner fan repair.


  • Many different problems can cause the blower fan on your central air conditioner to stop running.
  • Follow our 3 easy DIY troubleshooting tips to get the fan going again and restore cooling in your home.
  • When you're not able to fix the problem yourself, count on Sears Home Services to fix the AC unit for you.

Why Your Air Conditioner Fan Won’t Run

When your air conditioner fan fails in the heat of a southern summer, you know it right away as the inside of your home heats up quickly. Let's take a look at some common reasons your fan might quit:

  • Tripped house circuit breaker: The inside blower unit won’t get power if the house circuit breaker trips.
  • Faulty fan motor: The fan motor spins the blower wheel that circulates air through the system. When the fan motor fails, the fan won't spin and no air will circulate. Replacing the fan motor typically requires a service technician.
  • Loose or broken wires: Loose or broken wires can prevent the fan motor from getting the electric current needed to spin the blower wheel. The wires going to the fan motor are difficult to access for a homeowner. You’ll usually need to have a service technician fix this type of problem too.
  • Failed capacitor: The capacitor jump-starts the fan motor. If it's not working right, the fan might not start or might run slower. A technician can test the capacitor and replace it if necessary.
  • Control failure: Most air conditioner units use an electronic control board and relays to control the fan. If the electronic control board or a relay fails, the fan won’t run. A service technician is often needed to diagnose and repair this type of failure as well.
  • Tripped condensate drain float switch: If the condensate drain pipe gets clogged and water backs up into the drain pan below the evaporator, a flow switch trips and the control shuts off the fan in some units.

Remember, it's almost always wise to consult a professional HVAC technician if you're experiencing issues with your air conditioner fan. They have the know-how and skills to accurately diagnose the problem and make necessary repairs or replacements. Regular maintenance and timely repairs can prevent future fan failures and keep your air conditioner running smoothly.

DIY Steps to Troubleshoot a Non-Working Air Conditioner Fan

There are several steps you can take to identify and potentially fix the problem when the fan quits. Follow these steps to get your fan back in action.

1. Check for Power

Make sure your inside unit is getting power. Check the house circuit breaker and reset the breaker if it has tripped. Some inside blower units have a light switch beside the unit. Make sure that light switch is turned on so the unit gets power.

2. Reset the Electronic Control Board

Sometimes, a power surge or glitch through the electric power lines will cause the electronic control board to quit working. Try shutting the system off at the thermostat then shutting off the house circuit breakers for the air conditioner for 5 minutes. Restore power and see if the unit works.

3. Check for a Clog in the Condensate Drain Line

This is the #1 fix for a fan not blowing. Watch this DIY video and follow the instructions to clear the condensate drain line if it’s clogged:

You can be the hero of your home if you pull off this DIY fix when the AC stops working in the summer.

Remember, if you're unsure or uncomfortable doing any of these troubleshooting steps, call a professional. A qualified technician will have the tools and expertise to diagnose and fix any air conditioner fan issues effectively.

Preventing Air Conditioner Fan Problems

Regular cleaning of AC air vents can help prevent problems with your air conditioner fan. Dust, dirt, and debris can build up on the fan return vent grills going to the inside unit, inhibiting cooling air glow going to the fan motor. To prevent this, clean the return air vents regularly.

Proper airflow and ventilation are also crucial for the best performance of your air conditioner fan. Make sure there's nothing blocking the return airflow around the unit, like furniture or indoor plants. Also, ensure that you replace the AC air filters on time—no exceptions. You may even need to change the air filters more often that called for in the heat of summer when the unit runs more often. Clogged filters can restrict airflow and put unnecessary strain on the fan motor.

While regular cleaning can help prevent issues with your air conditioner fan, it's also important to schedule professional inspections and tune-ups. A trained technician can identify and fix any potential problems before they become major issues. They can check the fan motor, lubricate moving parts, and ensure that the electrical connections are secure.

Regular professional maintenance won’t just help prevent breakdowns, your central AC will last longer when it’s well-maintainged

By following these preventive maintenance tips, you can keep your air conditioner running smoothly and efficiently, ensuring a cool and comfortable home during the hot southern summers.

Schedule your HVAC repair now!

Rely on our skilled technicians to diagnose and repair your HVAC equipment, ensuring optimal comfort in your home.

Call (213) 596-2538 or schedule online now.

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