The ac blower motor starting and then stopping problem could be due to a faulty capacitor or a defective motor. It is important to resolve this issue as it can cause damage to your ac system and result in costly repairs.

As the summer heat intensifies, you rely on your air conditioner more than ever to keep your home cool and comfortable. Unfortunately, sometimes your ac unit may not work as it should, and one common issue is when the blower motor starts and then stops abruptly.

This can be frustrating, especially if you’re not sure what’s causing the problem. It’s essential to address this issue as soon as possible to prevent further damage to your ac system, which can result in expensive repairs. In this article, we’ll explain the most common causes of this problem and what you can do to fix it.

Common Causes Of Ac Blower Motor Starting And Stopping

Ac Blower Motor Starts Then Stops

If you find your ac blower motor starts and stops frequently, it can be frustrating and uncomfortable. Your ac blower motor is responsible for distributing the cold air throughout your home, so when it begins to function abnormally, you can feel the heat in your living space.

In this post, we will discuss the common causes of an ac blower motor starting and stopping.

Lack Of Airflow

One of the common reasons why an ac blower motor starts and stops is due to a lack of airflow. The airflow can be restricted by a dirty air filter, which can prevent your blower from working effectively.

  • A dirty air filter results in the blocking of airflow, and it can make the ac system overheat, causing the blower motor to shut off.
  • A clogged air filter can also cause damage to the hvac system, resulting in an expensive repair or replacement.

Dirty Air Filters

As mentioned earlier, dirty air filters can restrict airflow and cause an ac blower motor to start and stop frequently. It is essential to replace your air filters regularly to keep your hvac system functioning optimally.

  • A standard air filter should be replaced every three months, while a high-quality filter can last up to six months.
  • Replacing the air filter can help maintain healthy indoor air quality, improve the ac’s efficiency, and ensure the longevity of the blower motor.

Insufficient Power Supply

Another cause of an ac blower motor starting and stopping can be an insufficient power supply.

  • A weak power supply can make the motor stop working during the startup process, leading to continuous starting and stopping.
  • In such cases, it is advisable to hire a professional electrician to check the power supply and fix the problem.

Faulty Thermostat

A faulty thermostat is another common culprit when it comes to an ac blower motor starting and stopping frequently.

  • A faulty thermostat can cause the system to turn on and off repeatedly, triggering the blower motor to stop working regularly.
  • If you suspect that the thermostat may be malfunctioning, you should get it checked by an hvac technician.

Malfunctioning Relay Switch

A relay switch is responsible for controlling the blower motor’s power supply, and a malfunctioning relay switch can cause the blower motor to start and stop frequently.

  • A malfunctioning relay switch can cause damage to the hvac system, making it necessary to hire a professional to fix the problem.
  • Investing in routine maintenance is essential for preventing ac blower motor problems.

Ac blower motor starting and stopping frequently can be frustrating and uncomfortable. The reasons behind this issue can range from dirty air filters to faulty thermostats or inadequate power supply. By investing in routine maintenance, such problems can be detected early, and professional help can be availed to fix the issue.

Troubleshooting Steps

If your ac blower motor is starting and stopping abruptly, some troubleshooting steps are necessary to identify the problem. You don’t want to leave the issue unaddressed since it could lead to further damage and higher repair costs. Here are six troubleshooting steps to consider.

Step 1: Inspect Air Filters

One of the most common causes of an ac blower motor stopping and starting can be dirty or clogged air filters. Dust and debris can accumulate, causing airflow restriction that can lead to overheating of the motor. It’s best to inspect the air filters regularly and replace them every 1 to 3 months to avoid any issues.

Step 2: Check Power Supply

Sometimes, the issue can be due to insufficient power supplied to the motor. Check the circuit breaker to make sure that the ac system is receiving the required amount of power. Make sure the power supply is turned on and the motor is receiving electricity without any interruption.

Step 3: Verify Thermostat Functionality

The thermostat controls the temperature and performance of the ac system. If it’s not functioning, it can impact the motor’s performance, causing it to start and stop. Verify that the thermostat is working, and if not, replace it.

Step 4: Examine Relay Switch

The relay switch is responsible for turning the ac motor on and off. If it’s malfunctioning or damaged, it can lead to the ac motor stopping and starting. Check the relay switch for any signs of damage and replace it if needed.

Step 5: Perform Motor Capacitor Test

The motor capacitor is responsible for providing a jolt of energy to start the motor. If it malfunctions or is damaged, the motor won’t start and stop. Test the capacitor using a multimeter and replace it if needed.

Step 6: Check Blower Wheel And Motor Bearings

Check the blower wheel and motor bearings for any signs of wear and tear or damage. If there is too much wear or damage, the motor will have to work harder to function, leading to abrupt starts and stops. Regularly lubricate the bearings to avoid any issues.

An ac blower motor that starts and stops without proper function can be due to various reasons. Regular inspection and maintenance of the system can improve its lifespan and avoid unanticipated breakdowns. Following these troubleshooting steps can help identify and fix the underlying problem, saving both time and money.

When To Call A Professional

Explanation Of When An Issue May Require Professional Assistance

Understanding when to seek professional help with your ac blower motor starts then stopping is crucial. Although basic troubleshooting methods can solve some minor problems, certain situations require expertise beyond a layperson’s abilities. Here are some things to consider:

  • If your ac has a faulty control board, you should seek the help of a professional technician. Ignoring it may lead to more extensive damage and cost you more down the line.
  • When there is a capacitor issue, it is essential to have a professional fix it. Capacitors store electricity, and handling them can be dangerous, especially if you are not familiar with electrical components.
  • In other cases, such as when the motor requires lubrication or cleaning, you may be able to carry out repairs on your own. Nonetheless, if you are hesitant, it’s always a good idea to call an expert.

Importance Of Hiring A Certified Technician

When your ac blower motor starts then stops, hiring a certified technician is an excellent idea. Certified technicians go through rigorous training and have expert knowledge of hvac systems, making them well-equipped to repair any issues you’re experiencing. Here’s why hiring one is essential:

  • Certified technicians have experience and knowledge, which makes them well-positioned to fix complicated ac problems.
  • A certified technician has code requirements and compliance with safety standards, ensuring that your system is repaired, installed, or maintained according to industry standards.
  • Since hvac systems are complex and often dangerous to operate, hiring a certified professional will not only save you time but will also keep you safe from any potential hazards.

While fixing minor ac problems such as lubricating motors and cleaning may be within your reach, it is always essential to have certified professionals handle complicated issues such as faulty control board or capacitors. Book an appointment with a professional ac technician today and keep your home or building safe and comfortable.

Preventative Maintenance To Avoid Ac Blower Motor Issues

Ac blower motors are an essential component of your hvac system, helping to push cool air through the ducts and into your home. However, if your blower motor starts and then stops abruptly, it could be an indicator of a more significant issue.

Often, the problem can be attributed to a lack of maintenance, and by following a few simple tips, you can prevent ac blower motor issues.

Importance Of Regular Maintenance

Performing regular maintenance on your hvac system can help you avoid a range of costly repairs and replacements. When you maintain your ac blower motor, you’re not only ensuring your system runs smoothly, but you’re also keeping your air clean.

By maintaining your system, you can:

  • Prolong the life of your unit
  • Improve energy efficiency
  • Maintain healthy indoor air quality

Performing maintenance on your ac blower motor may seem overwhelming, but with a few tips, it can be a simple process.

Tips For Maintaining The Blower Motor

Maintaining your ac blower motor can help you avoid system breakdowns and costly repairs. Here are several tips for maintaining your blower motor:

  • Check the air filter: A dirty air filter can cause your blower motor to work harder and lead to premature failure. Make sure to replace your air filter at least every three months.
  • Lubricate moving parts: Over time, the bearings that support the blower motor’s shaft can wear down. Lubricating the motor can help prevent premature wear and tear.
  • Clean the motor: Dirt and debris can accumulate on the motor, making it more difficult to operate. Use a soft-bristled brush or a vacuum to remove any dust or dirt buildup.
  • Schedule regular maintenance visits: Scheduling professional maintenance visits twice a year can help ensure your system is running correctly and prolong its lifespan.

Frequency Of Maintenance Visits

Regular maintenance on your ac blower motor is crucial to prevent breakdowns and keep your system running smoothly. However, how often should you schedule maintenance visits?

  • Annual maintenance: Schedule a professional maintenance visit at least once a year. Professionals can provide a thorough inspection and tune-up of your hvac system.
  • Biannual maintenance: Consider scheduling maintenance twice a year. This will ensure your system is thoroughly cleaned, and any minor issues are addressed before they turn into significant problems.

Maintaining your ac blower motor doesn’t have to be difficult. By following a few simple tips and scheduling regular maintenance, you can prolong the life of your system and avoid expensive repairs.

Frequently Asked Questions Of Ac Blower Motor Starts Then Stops

Why Does My Ac Blower Motor Start And Stop Repeatedly?

The ac blower motor may start and stop repeatedly due to overheating, dirt buildup, or a faulty motor.

How Can I Fix A Blower Motor That Keeps Stopping?

You can try replacing the blower motor capacitor or cleaning the blower wheel to fix a blower motor that keeps stopping.

Can A Dirty Air Filter Cause The Blower Motor To Stop?

Yes, a dirty air filter can cause the blower motor to stop by restricting airflow and causing the motor to overheat.

What Is The Average Lifespan Of An Ac Blower Motor?

The average lifespan of an ac blower motor is 10-15 years, but it may vary depending on usage and maintenance.

What Are The Signs Of A Failing Blower Motor?

The signs of a failing blower motor include reduced airflow, strange noises, and the motor repeatedly starting and stopping.

Can A Faulty Thermostat Cause The Blower Motor To Stop?

Yes, a faulty thermostat can cause the blower motor to stop by not sending a signal to turn on the fan.

Do I Need A Professional To Replace My Blower Motor?

Replacing a blower motor is a complex task and requires specialized tools. It’s best to leave it to a professional hvac technician.


As we conclude, an ac blower motor that starts then stops is a clear indication of a problem with your ac system. The good news is that identifying the issue and fixing it is possible. It could be something as simple as a loose wire or a faulty capacitor.

However, if it’s a more complex problem, consider bringing in an hvac technician for a thorough examination and repair. The best way to prevent future issues is by scheduling routine maintenance for your ac system, which can detect and fix minor problems before they escalate into larger ones.

By being proactive about ac maintenance, you will save yourself time, money, and the frustration of having to deal with an ac breakdown during the hottest months of the year. Stay cool and comfortable by keeping your ac system running smoothly!

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