SAN ANTONIO GUIDE

The breaker trips, and another reset does not hold

The air conditioner starts, or tries to, and the breaker kicks off. The house is warm, the thermostat still asks for cooling, and resetting the handle worked for a minute or did not work at all. One careful reset is a check. A second trip is the end of the homeowner part. Holding the handle on, or fitting a larger breaker, is how a nuisance becomes a fire.

By Mike Maziarz · Sources checked October 12, 2026 · How we write these guides

One reset, then leave it off

A breaker is a safety device. It opens when the circuit draws more than it should, or when the breaker itself has failed. If the handle is in the middle or off, and the panel does not smell hot, is not buzzing, and shows no scorch or melted plastic, you may reset that one breaker a single time. Move it fully off, then on. If cooling runs and stays running, watch it. If it trips again, stop. Do not reset it in a loop through the afternoon.

Do not hold the handle in the on position. Do not tape it. Do not replace it with a breaker of a higher number so it stops opening. The number on the breaker is not a setting you turn up because the air conditioner wants more. A larger breaker does not fix a failing compressor, a shorted wire, or a fan that cannot turn. It removes the warning. If the panel is warm, if you smell hot insulation, or if you see smoke, leave every handle alone, get people out, and call emergency services if there is fire.

Which handle actually tripped

Houses often have more than one breaker in the cooling circuit. The outdoor unit may have a double-pole breaker in the main panel. The air handler in the attic or a closet may have its own breaker. A small disconnect box sits on the wall beside many condensers. A trip at the main panel, with the rest of the house still lit, is a different report from a whole-house outage. Write down which handle moved, and whether the lights in the kitchen stayed on.

If the neighbors are dark and your whole panel is dead, the problem may be outside the air conditioner. CPS Energy is the city-owned electric utility. An outage is not fixed by exercising the air conditioner breaker. If only the air conditioner handle opens, and the lights stay on, the fault is on that circuit. A blank thermostat can be the same trip, because some thermostats take power from the air handler. The screen check is in thermostat troubleshooting. If new batteries and a single reset do not hold, you are finished at the wall.

What a trip is pointing at

A technician is sorting among a few real causes. A capacitor or a compressor that cannot start will pull hard and open the breaker. A fan that hums and does not spin can overheat a motor until the breaker opens. That outdoor symptom has its own page, the fan that will not spin, and it is still not a panel for you to open. A short in the wiring, a failing breaker, or a loose connection at the disconnect can trip with little or no hum at all. You will not tell those apart by the feel of the handle.

Say what you heard in the seconds before the trip. A hum, a click, silence, a buzz at the panel, or a burning smell are different notes. Say whether the outdoor blade was turning. Say whether this started on the hottest afternoon of a long run, or the first time you used cooling in spring. Long San Antonio summers ask compressors to start and stay running in serious heat. That is context. It is not proof the compressor is finished, and it is not a reason to keep resetting until something gives.

Older attic systems, without a magic age

A lot of San Antonio equipment sits in an attic and has already lived through many cooling seasons. Age makes parts harder to find, and it makes a repeat failure more worth a straight conversation about repair or replacement. Age does not, by itself, tell you the breaker trip is a condemned compressor. A system from the 1990s or the 2000s can trip because of one failed electrical part that is still sold. It can also trip because the compressor is done. Ask for the part name before you accept a full changeout in the driveway.

How to weigh that answer is in repair versus replace. The factors that change the work, still with no prices, are in repair cost factors. A trip that ends in a new system is also the moment to ask about a permit and about any CPS Energy rebate the project might qualify for. Neither paper belongs in the first five minutes, while the breaker is still being used as a switch.

Who is allowed to open the equipment

The Texas Department of Licensing and Regulation requires a license for contractors who install, repair, or maintain air conditioning, refrigeration, or heating equipment, and an air conditioning company has to employ a licensed contractor. Look the company up on the state page before anyone removes a panel at the condenser or in the attic. The questions to ask in person are in what to ask before you hire.

If the failed part is the breaker in the house panel rather than a part in the air conditioner, ask the company whether that repair is theirs or an electrician job. This guide will not invent a split that your city has to honor. It will say you should hear the answer in words, and you should not accept a larger breaker as the repair. Inside San Antonio, equipment replacement can also be a permit question for the Development Services Department. The license and the permit are different papers, which is the point of permits and inspections.

While the cooling stays off

Leave the tripped breaker off. Do not run the system on an extension, and do not move the wires to a different breaker to finish the day. Close blinds, and if the indoor temperature is climbing, do not treat a fan as an air conditioner. A fan only moves air. Older adults, infants, and anyone who already feels ill should not wait in a house that cannot cool. Move them. If someone is in distress, call emergency services. The rest of the same-day list is in no-cooling emergency steps.

When a technician is on the way, the useful note is short. Which breaker, how many times it tripped, any smell, whether the outdoor fan was turning, and who is still in the house. You should not feel pressed to approve a compressor or a new condenser because the hallway is miserable and the handle will not stay up. The measurement comes first. The breaker stays off until someone who is allowed to open the cabinet says why it opened.