AC Not Turning On? Common Causes and How to Fix It

If your air conditioner isn’t turning on, it can be a frustrating experience—especially during the scorching Dallas heat. Before you panic and call a technician, try troubleshooting the issue yourself. There are several common reasons why your AC might not be starting up, and many of them are simple to fix. In this guide, we’ll walk you through what might be happening and how to get your system up and running again.

Common Causes for an AC Not Turning On

When your AC refuses to turn on, the first step is to determine what might be causing the issue. Here are some of the most common reasons why your system may not be starting:

Power Supply Issues

It might sound obvious, but power issues are a leading cause of an AC not turning on. Check the power supply to see if your unit is plugged in and not turning on. Start by verifying that the system is connected to a working outlet. You should also check if the circuit breaker has tripped. A tripped breaker is a common reason for an AC unit to stop functioning, and it’s a quick fix by simply resetting the breaker.

Thermostat Problems

Another common issue is a malfunctioning thermostat. If the thermostat isn’t working properly, it can prevent your AC unit from receiving the signal to turn on. Check the temperature settings and ensure the thermostat is set to ‘Cool.’ Also, ensure the thermostat is functioning correctly—if it’s battery-powered, try replacing the batteries.

Clogged Air Filters

If your air filters are clogged with dust and debris, airflow will be restricted, and the AC unit could shut off to prevent damage. A dirty air filter can make your system overheat and may trigger a shutdown. Replace or clean the filter and see if the system turns back on.

Faulty Capacitor

The capacitor is essential to your AC system, helping it start up and run efficiently. If it’s malfunctioning, your AC may not turn on. This is more common in older systems. Capacitors can wear out over time, and in some cases, they may need to be replaced. If you suspect a faulty capacitor, it’s best to call a professional to diagnose it.

Frozen Evaporator Coils

Frozen evaporator coils are another common reason your AC might not turn on. If there’s a refrigerant leak or airflow is restricted, the coils may freeze, causing the system to shut off. If so, let the coils thaw and clean or replace the air filter. It is important to inspect the refrigerant level and call for service if you suspect a leak.

Troubleshooting Steps to Try Before Calling a Professional

If your AC is not turning on, try these simple troubleshooting steps before reaching out to a technician:

• Check the thermostat settings: Ensure it’s set to “Cool” and the temperature is lower than the current room temperature.
• Inspect the power supply: Look for tripped breakers or disconnected wires.
• Replace the air filter: A clogged filter could be restricting airflow and causing the system to shut off.
• Ensure proper airflow: Make sure vents are open and unobstructed.
• Allow the system to thaw: If the coils are frozen, turn off the AC and let the system thaw before turning it back on.

When to Call FERSA HVAC for Help

If you’ve tried troubleshooting your AC and it still won’t turn on, it’s time to call the professionals. A certified HVAC technician can identify and fix issues like faulty capacitors, refrigerant leaks, or electrical problems. FERSA HVAC Heating & Air has over 18 years of experience servicing homes in Dallas, Mesquite, and surrounding areas. Our technicians will quickly diagnose and repair your AC to restore your comfort.

Don’t Let a Broken AC Leave You in the Heat

An AC that won’t turn on can quickly turn your home from a comfortable sanctuary into an uncomfortable space. If you’re tired of sweating through a warm house, call FERSA HVAC Heating & Air. Our team of experts is available to help you get your system back up and running so you can enjoy the cool air again. Call (214) 449-8475 to schedule a repair or inspection today!