Why Does My Air Conditioner Keep Turning On and Off?

Your air conditioner shouldn’t run constantly, but it also shouldn’t be going on and off quickly. It’s supposed to run in full cycles, long enough that it cools your home to the temperature you set on the thermostat. When this doesn’t happen, it usually signals an issue with your system. Understanding this problem, also known as short-cycling, could help you make informed choices for your system and home.

What Is Short Cycling?

Short cycling is when your system doesn’t complete a full cycle. It shuts off partway through, never quite reaching your preferred temperature. The unit then turns back on, and the process repeats.

Why Is Short Cycling a Problem?

The constant stopping and starting can put significant strain on your system, which could reduce its lifespan. It can also strain the individual components, potentially leading to repairs or part replacements. Additionally, you may notice your utility costs going up as a result.

Another major issue is that your home likely won’t reach the set temperature. This could lead to unsafe or uncomfortable conditions, especially in San Marcos. The average July high is about 94 degrees, making it crucial to have reliable, consistent cooling.

Common Causes of Short Cycling

There are several reasons why short cycling can occur. In some situations, you may be able to fix things on your own, but most will require the assistance of a skilled HVAC technician.

Dirty Air Filter

This is one of the most common causes of your AC short cycling. Over time, debris accumulates and compacts on your air filter, causing a clog that blocks airflow. When this happens, your system works harder and uses more energy, which can lead to overheating. Your system shuts down prematurely as a protective measure before completing a full cycle. Once it cools down, it turns back on again, only to have the issue continuously repeat.

Electrical Troubles

An electrical issue could also be the culprit. For example, there may be a problem with the capacitor or faulty wiring. It may disrupt electrical power to the unit, causing it to constantly go off and on.

Refrigerant Leak

A refrigerant leak could cause short cycling. If there’s a leak, the refrigerant levels can get low, which prevents the heat transfer process from happening properly. A sweet odor near the unit and a hissing sound are two other signs that there might be a leak.

Oversized Unit

An air conditioner needs to be the proper size for your home. Some homeowners think that an oversized unit is the best option for cooling quickly. However, a balance of power is critical. If a unit is too powerful, it rapidly cools your home and gets it to your preferred temperature. However, it shuts off before it completes the cycle, which means that it’s not running long enough to properly dehumidify the air. The combination of a cool environment and excessive humidity could feel uncomfortable, especially over time.

Can I Fix the Short Cycling Issue Myself?

You may be able to fix the short cycling issue yourself, but there’s a caveat. The only thing homeowners should attempt is cleaning the filter. It’s relatively safe to do as long as you practice proper safety measures. The first step is turning the unit off. Take the filter out of the unit, noting how it’s positioned as you remove it, and put the new one in the same way. Turn the system back on and pay attention to whether the short cycling continues. If it does, then the problem is likely related to another issue.

When to Call a Professional HVAC Technician

You should call our licensed HVAC technicians if changing the filter didn’t fix the short cycling problem. For safety purposes, don’t try to fix the system on your own. Our technicians have extensive experience and professional tools to handle the task efficiently. Schedule an appointment right away, especially if it’s in the middle of summer. Allowing your unit to operate while it’s short cycling could lead to extensive repairs, a breakdown, or complete system failure.

Get your air conditioner in peak condition for the hot temperatures. SM Air in San Marcos, TX, provides dependable AC maintenance, repairs, and other services to homeowners.

Book an appointment through our website or call our team directly to schedule cooling services in San Marcos.