If your AC won’t turn on, especially during the peak of summer in St. Louis, it can quickly become a frustrating and uncomfortable situation. Air conditioners rely on various electrical components to function properly, and a failure in any part of the system can prevent it from starting. Understanding the common causes of AC electrical issues can help you troubleshoot the problem and determine whether you need professional repair services.
To learn more or schedule air conditioner repair in St. Louis, contact the experts at Galmiche & Sons today.
Common Reasons Your AC Won’t Turn On
1. Tripped Circuit Breaker
One of the first things to check when your AC won’t turn on is the circuit breaker. Air conditioners draw a significant amount of power, and if there’s an overload, the breaker may trip to protect your system from damage.
How to fix it:
- Locate your electrical panel and check if the AC breaker has flipped to the “off” position.
- If so, switch it back on and see if the unit starts.
- If the breaker trips again, this could indicate an electrical fault that needs professional attention.
2. Blown Fuse
Your AC unit may also have a fuse that protects it from power surges. If the fuse is blown, the system won’t receive power and won’t start.
How to fix it:
- Inspect the fuse in the outdoor disconnect box (typically located near the outdoor condenser unit).
- If the fuse appears burned out, it will need replacement.
- If you are unsure or uncomfortable checking the fuse, call a professional HVAC technician for safe diagnosis and repair.
3. Faulty Thermostat
If the thermostat isn’t working correctly, it may not be sending the proper signals to your AC to turn on.
How to fix it:
- Ensure the thermostat is set to “cool” mode and that the temperature is set lower than the current room temperature.
- Replace the batteries if it’s a battery-powered thermostat.
- If the display is blank or unresponsive, it may be time for a replacement.
4. Malfunctioning Capacitor
The capacitor is responsible for supplying power to the compressor and fan motors. A bad capacitor can prevent your AC from turning on.
Signs of a failing capacitor:
- AC makes a clicking sound but doesn’t start.
- The unit hums but fails to turn on.
- AC starts but shuts off quickly.
How to fix it:
- Replacing a capacitor requires specialized tools and should only be handled by an HVAC professional.
5. Loose or Damaged Wiring
Electrical connections inside your AC unit can become loose over time due to vibrations or wear and tear. Damaged wiring can also prevent the system from receiving power.
How to fix it:
- Visually inspect wiring for signs of fraying or burns.
- Do not attempt to repair wiring yourself; contact a professional to safely diagnose and fix electrical issues.
6. Contactor Problems
The contactor is an electrical relay that helps supply power to the compressor and outdoor unit. If the contactor is faulty, your AC may not receive the necessary power to start and thus your AC won’t turn on.
How to fix it:
- A worn-out or stuck contactor will need to be replaced by a licensed HVAC technician.
FAQs About AC Electrical Issues
Why does my AC keep tripping the breaker?
Can I replace a capacitor myself?
How can I prevent AC electrical problems?
Contact Galmiche & Sons for Expert AC Repair in St. Louis
If your AC won’t turn on and troubleshooting hasn’t solved the issue, it’s time to call the professionals. At Galmiche & Sons, we provide expert AC repair services in St. Louis, ensuring your home stays cool and comfortable. Contact our heating and air conditioning experts today to schedule an appointment and get your air conditioner back up and running!
