AC Compressor Not Turning On: What to Do?

When the summer heat is in full force, a malfunctioning air conditioner can quickly turn your home into a sauna. If your AC compressor is not turning on, it's natural to feel frustrated and concerned. But before you start sweating the small stuff (or the big stuff, for that matter), take a deep breath and remember that there are several potential causes for this issue, many of which are relatively simple to address.

An AC compressor not turning on is one of the most common HVAC problems. While it's always a great idea to consult a professional if you're unsure of what you're doing, there are several troubleshooting steps you can take yourself before resorting to calling in the experts. This step-by-step guide will walk you through the process of diagnosing the problem. But before that, we want to help you understand what an AC compressor is and how it works. 

What Is an AC Compressor and What Does It Do?

The AC compressor is the powerhouse of your air conditioning system. It's responsible for circulating refrigerant, the substance that absorbs and releases heat, throughout the system. The compressor pressurizes the refrigerant, transforming it from a low-pressure gas to a high-pressure gas. This high-pressure gas then flows to the condenser, where it releases heat and condenses into a liquid. The cooled liquid refrigerant then travels to the evaporator, where it absorbs heat from the indoor air and evaporates back into a gas, starting the cycle again.

Without a functioning compressor, your AC system simply won't cool your home. It's like a car without an engine – it might look the part, but it won't get you anywhere. If your AC compressor is not turning on, it's crucial to address the issue promptly. Ignoring the problem can lead to further damage to your AC system, potentially resulting in costly repairs down the line.

7 Things to Do When Your AC Compressor Is Not Turning On

Discovering your AC compressor isn't turning on during a scorching summer day can feel like a nightmare. However, before you succumb to the heat, there are several troubleshooting steps you can take to potentially resolve the issue. 

1. Thermostat Check

Start with the basics and check if your thermostat is set to "cool" and the temperature is lower than the current room temperature. If it's not, your AC won't turn on. Don't forget to check the batteries too, as they can sometimes cause unexpected issues that are easy to overlook.

2. Circuit Breaker Check

Head over to your electrical panel and find the switch that controls your AC. If it's flipped off, switch it back on. However, if it keeps flipping off, there could be a bigger electrical problem that requires a professional electrician's attention. This could be a sign of an overloaded circuit or a wiring issue.

3. Air Filter Check

A dirty air filter can restrict airflow and make your AC work harder than it needs to, leading to overheating and shutdowns. If your filter looks clogged or hasn't been changed in a while, replace it with a new one. This simple fix can get your AC back in action and improve your indoor air quality at the same time.

4. Condenser Check

The big unit outside your house, the condenser, needs to be clear of any obstacles to work properly. Make sure there aren't any leaves, dirt, or debris blocking it. A clear condenser means better airflow and a more efficient AC. A dirty condenser may be one of the reasons why your AC compressor is not turning on.

5. Frozen Coil Check

If the coils inside your AC are covered in ice, that could be why your AC compressor is not turning on. Turn off your AC and let the ice melt completely before turning it back on. However, remember that frozen coils are usually a sign of another underlying issue, like a dirty filter or low refrigerant, so it's best to call a technician to diagnose the problem.

6. Refrigerant Check

Refrigerant is the stuff that makes your AC cold, and if it's low, your compressor might not work. But handling refrigerant is a job for the pros, so call a qualified HVAC technician if you think this might be the issue. They have the tools and expertise to safely check and refill refrigerant levels.

7. Call a Pro

If you've tried all these steps and still, your AC compressor is not turning on, it's time to call in the experts. HVAC technicians have the knowledge and experience to diagnose and fix complex AC problems, ensuring your system is working properly and keeping you cool.

Frequently Asked Questions