AC Not Working? Here’s What to Check Before Calling a Pro

When your air conditioner suddenly stops working, it can be more than an inconvenience—it can feel like an emergency, especially during a Texas summer. While it’s tempting to immediately call for help, many common issues can be resolved with a little DIY troubleshooting. At Air Techs Heating & Cooling, we’re here to walk you through the most common reasons your AC might stop working—and what to do next.

1. Check the Thermostat First

It might seem obvious, but many service calls begin with a simple thermostat misconfiguration. Make sure:

• It’s set to “Cool”
  
  
• The temperature is set lower than the current room temp
  
  
• Batteries are fresh (if it’s battery-powered)
  
  

If everything looks correct, try turning it off for 30 seconds and back on. Sometimes a soft reset solves the issue.

2. Inspect the Circuit Breaker

Power issues are a common cause of AC failure. Head to your electrical panel:

• Look for tripped breakers (especially the one labeled AC or HVAC)
  
  
• If it’s tripped, reset it once
  
  
• If it keeps tripping, that signals a deeper electrical problem—call a professional
  
  

You can also inspect the external disconnect switch near the outdoor unit.

3. Replace or Remove the Air Filter

A clogged filter can block airflow and even cause your AC to shut down as a safety precaution.

• Replace your filter if it looks dirty or hasn’t been changed in 30–60 days
  
  
• In a pinch, remove the filter and try running the unit briefly (never operate long-term without one)
  
  

Learn more about indoor air quality services that help keep your system efficient and your air clean.

4. Check for a Full Drain Pan or Clogged Condensate Line

If your attic or indoor unit has a full drain pan or clogged condensate line, a float switch might shut the system off to prevent water damage.

• Look for standing water near your indoor unit
  
  
• Use a shop vac to clear the drain line
  
  
• Check if the system starts back up after clearing
  
  

Need help? Contact us and we’ll diagnose it quickly.

5. Look at the Outdoor Unit

If your inside system is running but the outside unit is silent, check:

• If the fan blades are moving
  
  
• If there’s buzzing or humming but no spinning, it could be a bad capacitor
  
  
• If debris is blocking the fan or coils
  
  

Carefully clean the coils and remove any obstructions, but never reach into the unit while it’s powered.

Explore our AC installation services if your system is aging or struggling to keep up.

6. Frozen Evaporator Coils? Shut It Off Immediately

Ice on your indoor coils may be caused by:

• Low refrigerant (from a leak)
  
  
• Poor airflow (dirty filters or blocked ducts)
  
  
• Running the system with an open window or door
  
  

Turn off the AC to let it thaw completely. It may take several hours. Then replace your filter and restart the system. Still frozen? You likely need a repair.

7. Common Parts That Fail

If you've checked the basics and still don’t have cold air, it could be:

• Blown capacitor: Often causes the system to hum but not start
  
  
• Faulty contactor: Prevents electricity from reaching components
  
  
• Burnt fan motor: No airflow outside even though the system has power
  
  

These require professional service. Learn about our reliable AC repair options.

8. When to Call a Pro

If you’ve tried the steps above and the system still won’t turn on—or worse, it’s blowing warm air—it’s time to schedule a repair. We recommend calling us if:

• Your AC is more than 10–12 years old
  
  
• You hear strange noises (buzzing, rattling, clicking)
  
  
• Breakers trip repeatedly
  
  
• Ice forms again after thawing
  
  

We proudly serve Grand Prairie, Mansfield, Kennedale, Arlington, and Fort Worth.

9. Prevent the Problem Next Time

Routine maintenance is the #1 way to avoid surprise breakdowns. With Air Techs Maintenance Agreement, you’ll enjoy:

• Seasonal tune-ups
  
  
• Priority service
  
  
• Discounts on repairs
  
  
• Better energy efficiency
  
  

Final Thoughts: Don’t Sweat It—We’ve Got You Covered

A broken AC doesn’t have to ruin your day. Start with these basic checks, and if you still need help, Air Techs Heating & Cooling is ready with fast, friendly, expert service.

👉 Schedule your appointment now or request a quote and stay cool, no matter how hot it gets outside.

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