When your AC stops working in McAllen, a reset is often the first thing worth trying. Not because it fixes everything, but because it fixes enough things that it’s worth doing before you call a technician. A five-minute reset has saved plenty of homeowners a service call.
Here’s how to do it correctly, and more importantly, how to know when resetting won’t help.
What a Reset Actually Does
Resetting your AC unit clears error codes, restarts control systems, and allows a compressor that shut down under a safety lockout to try starting fresh. When something causes the system to trip a safety switch (like a power surge, a brief refrigerant pressure drop, or a temporary overload), the system locks out rather than continuing to run under fault conditions. A reset clears that lockout.
The key word is “temporary.” If the underlying condition that triggered the lockout is still there, the reset buys you a few minutes at best before the system trips again.
How to Reset Your AC Unit: Step by Step
Step 1: Turn off the thermostat
Set your thermostat to “off” first. You want to fully power down the system before cutting power at the breaker. If you cut the breaker while the system is actively running, you’re doing a hard shutdown while the compressor is under load, which isn’t ideal.
Step 2: Find the circuit breaker and cut power
Go to your electrical panel. Your AC system is on its own dedicated breaker, sometimes two: one for the indoor air handler and one for the outdoor condenser unit. Flip both to the “off” position.
Step 3: Locate the reset button (if your system has one)
Not every AC unit has a manual reset button, but many outdoor condenser units do. It’s typically a small red button on or near the outdoor unit’s electrical panel, often near the refrigerant lines. If you see it, press and hold it for about three seconds until you feel it click.
Step 4: Wait 30 minutes
This is the part people skip. The compressor needs time to equalize pressure before restarting. If you restore power too quickly, the compressor struggles against unequalized pressure and the system will often trip again immediately. Set a timer. Wait the full 30 minutes.
Step 5: Restore power and restart
Flip the breakers back on. Wait another two to three minutes before setting the thermostat back to “cool.” This gives the system a moment to initialize before the compressor is asked to run.
Step 6: Watch what happens
If the system starts, runs steadily, and your home cools normally over the next 30 to 60 minutes, the reset worked and whatever tripped the safety switch was temporary (a brief power surge or transient fault). Monitor it for the rest of the day.
If the system starts but shuts off again within a few minutes, something is still wrong. Don’t keep resetting it because you can damage the compressor by repeatedly forcing restarts under fault conditions.
When a Reset Will Work
A reset is most likely to solve your problem when:
- There was a recent power surge, brownout, or power outage
- The outdoor unit tripped due to a brief high-pressure spike (often happens during extreme heat)
- The condensate drain line float switch tripped but the drain blockage has since cleared
- The thermostat experienced a software glitch
In these cases, a reset clears the fault and the system runs normally. No further action needed.
When a Reset Won’t Help
If any of these are true, resetting is not going to fix the underlying problem:
The system restarts but shuts off again quickly. This means the safety switch is still tripping. The fault is still active, it could mean a refrigerant pressure issue, an overheating motor, or a failing component.
The system won’t start at all. If you hear nothing after restoring power, the issue is likely electrical (failed capacitor, failed contactor, tripped breaker that won’t hold) or mechanical. These need a technician. Read about when your AC won’t turn on at all for a full diagnostic walkthrough.
The system runs but blows warm air. If your AC is blowing warm air, which points to low refrigerant, a dirty evaporator coil, or a reversed refrigerant cycle. A reset won’t change any of those.
The system cools but poorly. If your home is taking much longer than usual to reach temperature, or rooms that were comfortable before now feel warm, you have a performance issue that resetting won’t address. Read about why your AC isn’t cooling properly for a breakdown of the most common causes.
How Many Times Can You Reset?
Once, maybe twice if the first reset is followed by a period of normal operation and then a second fault. Resetting more than twice in a short period is a sign something is wrong, and you risk damaging the compressor by forcing restarts against a fault condition. At that point, call a technician.
What to Tell the Technician
If you do call for service, tell them:
- When the problem started
- Whether the system tripped a breaker
- How many times you reset and what happened each time
- Whether the system ran at all after each reset, and for how long
This helps the technician narrow down the fault before they arrive, which means a faster diagnosis.
Frequently Asked Questions
How often should I have to reset my AC?
Never, under normal operation. If you’re resetting more than once a summer, something is wrong. A properly operating system doesn’t trip safety lockouts under normal conditions.
Is it safe to reset my AC multiple times?
Resetting once or twice is fine. Repeatedly resetting when the system keeps tripping is not, you can damage the compressor. Two strikes and out: call a technician.
My AC reset worked, but it happened again a week later. What does that mean?
Intermittent faults that clear on reset and then come back are often early signs of a component starting to fail, a capacitor that’s weakening, a refrigerant system with a slow leak, or a contactor that’s getting inconsistent. It may work fine for a while, but it’s a signal something needs attention before it fails completely.
Does resetting the AC clear the warranty?
No. Resetting via the thermostat or breaker is normal user operation and doesn’t affect any warranty.
Still Having Issues?
Mission Air Conditioning serves McAllen and the Rio Grande Valley. If a reset didn’t fix it or the problem keeps coming back, our AC repair services include full system diagnostics. We’ll tell you what’s wrong and what it costs before any work starts. Reach out at missionaircon.com.