What Is The Most Common Part To Go Out On An AC?
Let’s cut to the chase. The capacitor is the most common part that fails on an air conditioning unit. It’s a small component with a big job—giving your AC the jolt it needs to start up and keep running. Without it, your system might sit there, humming or buzzing but doing no real work.
At SouthSota One Hour Heating & Air Conditioning, we’ve seen countless calls in the middle of a heatwave, and more often than not, it’s the capacitor that’s down for the count.
Why Does the Capacitor Fail?
Capacitors live a hard life. They handle high voltage, fire up the compressor and fan motors, and operate every time your system kicks on. Over time, they wear out. High heat, power surges, or old age can push them over the edge.
Think of a capacitor like a battery that helps your AC get moving. Now imagine that battery sitting in 100°F heat, cycling on and off all summer long. It’s no wonder they give out.
Other Common Troublemakers
While capacitors lead the pack, they’re not the only part that throws in the towel.
- Contactors – These control the flow of electricity. If they fail, nothing turns on.
- Fan Motors – Indoor or outdoor, these motors can seize or short out.
- Compressor—This is the heart of the system. If it fails, you’ll likely need a major repair or full replacement.
- Refrigerant Leaks—This is not a “part” per se, but low refrigerant levels usually mean there’s a leak somewhere.
- Thermostats – Sometimes, the issue isn’t with the unit but the thermostat sending bad signals.
What We Do During a Repair Call
We don’t play guessing games when you call SouthSota One Hour Heating & Air Conditioning. Here’s our usual process:
1. Initial Assessment
We ask a few questions, listen closely, and take notes. Is the unit making noise? Blowing warm air? Not turning on at all?
2. System Check
We inspect the entire system—starting at the thermostat and ending at the condenser outside. We test components, measure voltage, and check pressures.
3. Diagnose and Explain
We’ll tell you exactly what’s wrong, what failed, and why. You’ll get a clear plan with no surprises. We’ll even show you the bad part if you want to see it.
4. Repair and Retest
We swap the bad part, run the system, and watch how it performs. We want to be sure you’re not calling us back tomorrow.
5. Maintenance Tips
We’ll give you pointers so you can help prevent the issue from happening again.
When Should You Call Us?
Don’t wait until your house feels like a sauna.
These signs mean it’s time to get us on the phone:
- AC blows warm air
- Unit doesn’t turn on at all
- You hear clicking or buzzing, but no fan
- Your breaker trips when the AC starts
- AC runs, but your house doesn’t cool down
- Sudden rise in your power bill
If your gut says something’s off, trust it. We’ve seen cases where a buzzing unit ended up with melted wires because someone waited too long.
FAQs
Can I replace a capacitor myself?
Technically, yes—but it’s dangerous. Capacitors hold a charge even after the power is off. One wrong move and you could end up in the ER. Please leave it to us.
How much does it cost to replace a capacitor?
Most capacitor replacements are affordable—typically less than a dinner for four at a decent restaurant. And it keeps your house cool.
Why do capacitors fail so often?
They wear out from constant use and heat exposure. Think of them like brake pads—meant to work hard, but they don’t last forever.
Is there a way to tell if my capacitor is bad without opening the unit?
If your AC clicks but doesn’t turn on, or the fan doesn’t spin, it’s a common sign the capacitor has failed. But a full diagnostic is the only way to be sure.
Do capacitors fail in winter too?
Capacitors are mostly tied to cooling functions. If your heat pump acts up in winter, a capacitor could still be the culprit—but it’s less common.
Let’s Get That Cool Air Flowing Again
No one wants to sweat it out while waiting for AC repair. If your system’s acting up, don’t cross your fingers and hope it fixes itself. Give us a call at SouthSota One Hour Heating & Air Conditioning. We’ve replaced more capacitors than we can count—and we always bring extras. We show up fast, talk straight, and fix it right the first time. Summer’s too short to spend it mopping your brow. Let’s get your AC back on track.
