A GFCI outlet replacement takes about 15 minutes and requires only a screwdriver

A GFCI outlet (ground fault circuit interrupter) is a safety device that cuts power when ready if it detects a ground fault—a dangerous electrical leak. When one stops working or trips repeatedly, you replace it the same way you'd replace any outlet: turn off power at the breaker, remove the old one, and wire the new one in its place. The only difference is that GFCI outlets have two sets of terminals—LINE terminals where power enters, and LOAD terminals that protect other outlets downstream—so you need to know which wires go where.

This is a straightforward job for a homeowner with basic comfort around electrical work. If you've never worked inside an outlet box before, or if you're uncertain about which breaker controls the outlet, call a licensed electrician. A bad connection can create a fire hazard.

Key Takeaways

  • Turn off power at the breaker and test the outlet with a voltage tester to confirm power is off before you touch any wires.
  • Remove the old outlet by unscrewing the terminal screws and pulling the wires free, noting which wires were connected to LINE and which to LOAD.
  • Connect the new GFCI outlet by screwing the incoming power wires to the LINE terminals and any outgoing wires to the LOAD terminals.
  • Push the outlet into the box, screw the cover plate on, restore power, and test the outlet with its TEST and RESET buttons.

What you'll need before you start

Gather a flathead or Phillips screwdriver (whichever fits your outlet screws), a non-contact voltage tester, and the replacement GFCI outlet. A voltage tester is essential—it tells you whether power is actually off, which a breaker switch alone cannot may provide. They cost $10 to $20 and are worth owning if you do any electrical work at home.

If the outlet is in a wet location—bathroom, kitchen, garage, or outdoor—your local electrical code requires a GFCI outlet. If it's in a dry location like a bedroom, a standard outlet with GFCI protection upstream (at the breaker or at another outlet) is also legal, but a GFCI outlet works fine anywhere.

Turn off power and confirm it's off

Go to your electrical panel and flip the breaker that controls the outlet you're replacing. If you don't know which breaker it is, flip breakers one at a time and test the outlet with a lamp or phone charger until it stops working. Label that breaker or take a photo so you remember it next time.

Once the breaker is off, use your voltage tester on the outlet. Touch the tester probe to the hot slot (the smaller vertical slot on the right side of a standard outlet), then to the neutral slot (the larger slot on the left), then to the ground hole (the round or U-shaped hole at the bottom). The tester should not light up or beep. If it does, the breaker you flipped is not the right one—turn it back on, try another breaker, and test again.

Remove the old outlet

Once you've confirmed power is off, unscrew the two terminal screws on the old outlet—one on each side. The screws hold the wires in place. As you loosen each screw, the wire should come free. If a wire is stuck, loosen the screw a bit more and gently pull the wire straight out. Do not yank or twist it.

As you remove each wire, note which terminal it came from. The LINE terminals are marked "LINE" on the outlet body and are where power enters from your breaker. The LOAD terminals are marked "LOAD" and are where wires go out to protect other outlets. In most cases, you'll have two wires on the LINE side (hot and neutral coming from the breaker) and possibly two more on the LOAD side (going to other outlets). If you only have two wires total, they go on LINE and there is no LOAD connection.

Once all wires are free, unscrew the outlet from the electrical box and pull it out. Set it aside.

Connect the new GFCI outlet

Take your new GFCI outlet and look at the terminal screws. You'll see four screws: two brass-colored ones on the right (hot terminals), and two silver-colored ones on the left (neutral terminals). The top pair is marked LINE; the bottom pair is marked LOAD.

Strip about half an inch of insulation from the end of each wire if the old outlet damaged the insulation. Insert the hot wire (usually black) that came from the breaker into the brass LINE terminal screw on top right, and tighten the screw until the wire is snug. Do the same with the neutral wire (usually white) into the silver LINE terminal screw on top left.

If you have wires going to other outlets (the LOAD wires), insert the hot wire into the brass LOAD terminal screw on the bottom right, and the neutral wire into the silver LOAD terminal screw on the bottom left. Tighten both screws. If you have no LOAD wires, leave those terminals empty.

find the outlet and test it

Carefully push the outlet back into the electrical box. The outlet should sit flush against the box—if it doesn't, you may have wired it incorrectly or the wires may be bunched. Gently straighten any bent wires and try again. Once it's flush, screw the cover plate on.

Go back to the breaker panel and flip the breaker back on. Return to the outlet and press the TEST button on the GFCI outlet. You should hear a click and the outlet should lose power (a lamp plugged in will turn off). Press the RESET button and the outlet should regain power. If both buttons work, the outlet is installed correctly.

If the outlet does not click when you press TEST, or if it trips when ready after you reset it, turn off the breaker again and check your wire connections. Make sure each wire is fully inserted under its terminal screw and that hot and neutral are not reversed.

When to call a licensed electrician

Call an electrician if the breaker trips as soon as you restore power, if you cannot identify which breaker controls the outlet, if the wires in the box are damaged or corroded, or if you're uncomfortable working with live electrical connections at any point. An electrician can also tell you whether your outlet needs GFCI protection and whether your installation meets local code.

If the outlet you're replacing is in a wet location and you're not sure whether it needs GFCI protection, an electrician can confirm that too. Bathrooms, kitchens, garages, and outdoor outlets almost always require it, but local codes vary.

Frequently Asked Questions

What's the difference between a GFCI outlet and a regular outlet?

A GFCI outlet has a built-in sensor that detects ground faults—electrical leaks to ground—and cuts power in milliseconds. A regular outlet has no sensor. GFCI outlets are required by code in wet locations because water increases the risk of a ground fault that could cause electrocution.

Can I use a GFCI outlet in a dry location like a bedroom?

Yes. A GFCI outlet works safely anywhere. Some homeowners install them throughout the house for extra protection, though code only requires them in bathrooms, kitchens, garages, and outdoor areas.

What if I connect the wires to LOAD instead of LINE by mistake?

The outlet will not work. Wires connected to LOAD are meant to protect other outlets downstream, not to power the outlet itself. If you plug something in and nothing happens, turn off the breaker, check that the hot and neutral wires from the breaker are on the LINE terminals, and try again.

Do I need to replace all the outlets in my bathroom with GFCI outlets?

No. You only need GFCI protection on each outlet, which you can provide either with a GFCI outlet or with a GFCI breaker at the panel that protects all outlets on that circuit. One GFCI outlet can also protect other regular outlets on the same circuit if you wire it correctly—the downstream outlets connect to the LOAD terminals.

How often do GFCI outlets need to be replaced?

GFCI outlets typically last 15 to 25 years, though they can fail sooner in wet or corrosive environments. If an outlet trips constantly or won't reset, it's time to replace it. If it trips only occasionally, the problem may be a ground fault elsewhere on the circuit, not the outlet itself.