You plug in a space heater, turn on the hair dryer, or start the holiday lights, and suddenly half the room goes dark. Before you panic or call for help, there is a good chance the fix takes less than a minute.

Most sudden, partial power losses at home come from one of two safety devices doing exactly what they were designed to do: a circuit breaker or a GFCI outlet. Here is how to find the problem, reset it safely, and recognize when it is time to call a licensed electrician.

First, figure out what’s out

Walk around and check what has lost power.

  • If only one room or part of the house is out, it’s likely a tripped breaker or GFCI outlet.
  • If the whole house is out, check whether your neighbors have power too. If they don’t, it’s probably a utility outage, and you should contact your power company.
  • If outlets in a bathroom, kitchen, garage, laundry area or outdoors are dead, suspect a GFCI outlet first.

What a tripped breaker is

Your electrical panel contains breakers, each protecting a circuit. When a circuit draws more power than it safely can, for example a space heater and a vacuum running on the same circuit, the breaker “trips” and shuts off power to prevent overheating.

How to reset a circuit breaker

  1. Turn off or unplug the devices on the affected circuit, especially high-power items like heaters, hair dryers or microwaves.
  2. Find your electrical panel. It’s usually in a garage, basement, utility room, hallway closet or outside wall.
  3. Make sure your hands are dry and you’re standing on a dry surface. Use a flashlight if needed.
  4. Open the panel door and look for a breaker that is in the middle position or pointing the opposite way from the others. Some breakers show a small red or orange indicator when tripped.
  5. Push the tripped breaker firmly all the way to OFF first. Many breakers won’t reset unless you do this.
  6. Then push it firmly back to ON.
  7. Plug your devices back in one at a time.

Never remove the panel’s inner cover. The breaker switches are all you should touch.

What a GFCI outlet is

A GFCI (ground fault circuit interrupter) outlet has two small buttons labeled TEST and RESET. It cuts power very quickly if it senses electricity flowing where it shouldn’t, such as through water. That’s why you’ll find them near sinks, in bathrooms, garages and outdoors.

One GFCI outlet often protects other ordinary outlets further down the line, so a dead outlet may actually be controlled by a GFCI in a different spot, sometimes in another room.

How to reset a GFCI outlet

  1. Unplug anything connected to the outlet and nearby outlets on the same circuit.
  2. Find the GFCI outlet. Check the nearest bathroom, kitchen counter, garage and outdoor outlets.
  3. Press the RESET button firmly until it clicks and stays in.
  4. If it won’t stay in, check whether the breaker for that circuit is tripped, reset it, then try the GFCI again.
  5. Plug in a lamp or phone charger to confirm power is back.

It’s a good habit to press TEST and then RESET on your GFCI outlets every month or so to make sure they’re working.

Why it keeps tripping

A single trip is usually nothing to worry about. Repeated trips are a message.

  • Overloaded circuit: Too many high-wattage devices on one circuit. Move a space heater or appliance to a different circuit.
  • Faulty appliance: If it trips every time one device is plugged in, that device may be the problem. Stop using it.
  • Moisture: Outdoor and bathroom GFCIs can trip when outlets get wet. Make sure outdoor outlets have proper weatherproof covers.

When to call an electrician

Stop and call a licensed electrician if:

  • A breaker trips again immediately after you reset it
  • You smell burning, see scorch marks or feel heat at the panel or an outlet
  • You hear buzzing or crackling
  • A GFCI won’t reset even with power available
  • The panel shows signs of water, rust or damage

Electricity is not something to experiment with. Resetting a breaker or GFCI is a safe homeowner task; repairing wiring is not.

Make it easier next time

Spend 20 minutes labeling your breaker panel so you know which switch controls which room. Keep a flashlight near the panel, and show everyone in your household where it is and how to reset a breaker safely.

The takeaway

When power cuts out in part of your home, start with the panel and the GFCI outlets. Turn things off, reset firmly, and plug back in slowly. If the problem keeps coming back, that’s your cue to bring in a pro.

Image: Free circuit breaker switch flipped via Rawpixel, CC0 1.0