Why won’t my AC turn back on after the power comes back?
When power drops and returns, the surge can trip a breaker, scramble the thermostat’s settings, or trigger a safety switch in the system. Many systems also have a built-in delay of a few minutes before the compressor will restart. In most cases a simple reset gets things running again.
How do I reset my AC after a power outage?
- Turn the thermostat to Off. This keeps the system from trying to start while you check things.
- Check the thermostat. If the screen is blank, replace the batteries. Confirm the date, time, and schedule didn’t reset.
- Check the breakers. In your electrical panel, find the breakers for the indoor air handler and the outdoor condenser. If one is tripped, push it fully to Off, then back to On. Reset it only once.
- Check the outdoor disconnect. The switch or pull-out box near the outdoor unit should be in the On position. Don’t open the unit itself.
- Wait about 5 minutes. This gives the system’s pressures time to balance before the compressor starts.
- Set the thermostat back to Cool a few degrees below the room temperature and listen for both the indoor fan and the outdoor unit to start.
- Feel the air after 15 minutes. It should be noticeably cooler than the room.
Safety note: Never remove panels from the outdoor unit or air handler. Capacitors inside can hold a dangerous charge even with the power off.
Should I turn off my AC during a storm or outage?
Yes. When a Clearwater thunderstorm rolls in or the power goes out, set the thermostat to Off. Power often flickers on and off as it returns, and those surges are hard on compressors, capacitors, and control boards. We cover this in more detail in our post on what summer storms can do to your AC’s electronics. Wait until power has been steady for several minutes before turning cooling back on.
After a hurricane or tropical storm, walk around the outdoor unit before restarting. Look for standing water, branches, and debris, and see our guide on protecting your outdoor AC unit during hurricane season.
What if the breaker trips again?
Don’t keep resetting it. A breaker that trips a second time is telling you something is wrong, such as a shorted wire, a failing capacitor, or a compressor that is struggling to start. Repeated resets can turn a smaller repair into a bigger one. Leave the breaker off and the thermostat on Off.
When should you call a professional?
Call us if the breaker trips again, the outdoor unit hums but the fan doesn’t spin, you smell burning, the system runs but blows warm air, or the unit sat in floodwater. If your home is getting dangerously hot, our emergency AC service is available after hours (after-hours rates apply, and Ultimate Maintenance Plan members pay no after-hours upcharge). For everything else, schedule AC repair in Clearwater during office hours, Monday through Friday, 8:00 AM to 5:00 PM, at (727) 252-9602.
Frequently Asked Questions
Some outdoor units and air handlers have a reset or safety switch, but most homes reset the system with the thermostat and breakers. If you can’t find a clear reset control, don’t open panels to look for one. Call us instead.
Check the thermostat batteries and the air handler breaker. Many thermostats get power from the indoor unit, so a tripped breaker there can leave the screen blank.
Only after you have checked the outdoor unit for standing water, debris, and visible damage. If the unit was flooded, keep it off until a technician inspects it.