How to Replace a GFCI Outlet

How to Replace a GFCI Outlet

GFCI outlets last 10–15 years — after that, they can fail silently, providing power but no shock protection. If your GFCI won't reset, fails its TEST, or is simply old, replacing it is a straightforward DIY job that takes about 20 minutes and costs $15–25.

Here's exactly how to do it safely and correctly.

What You'll Need

• Leviton GFCI Outlet 15A Self-Test Tamper-Resistant (GFTR1-W) — our top pick for replacement. Self-testing means it automatically monitors its own protection status and alerts you with an LED if it ever fails. Tamper-resistant slots protect children. Fits standard outlet boxes.
• Klein Tools NCVT1P Non-Contact Voltage Tester — confirm power is off before touching any wires. Non-negotiable for safe outlet work.
• Klein Tools RT250 GFCI Outlet Tester — verify correct wiring and GFCI function after installation.
• WGGE Wire Stripper/Crimping Tool — if any wires need to be re-stripped for a clean connection.
• Flathead and Phillips screwdrivers
• Electrical tape
• Needle-nose pliers (optional)

Before You Start: Understand LINE vs LOAD

This is the most important concept for GFCI wiring. A GFCI outlet has two sets of terminals:

• LINE terminals (usually labeled LINE, often with yellow tape): connect to the wires coming FROM the electrical panel. This is the power source.
• LOAD terminals (usually labeled LOAD): connect to wires going TO downstream outlets you want the GFCI to protect.

If you're only replacing the GFCI outlet itself (not protecting downstream outlets), connect wires to LINE only and leave LOAD unused — cap the LOAD terminals with the included plastic caps.

Swapping LINE and LOAD is the most common GFCI wiring mistake — it causes the outlet to not reset or not function correctly.

Step-by-Step: How to Replace a GFCI Outlet

Step 1: Turn Off the Breaker

Go to your electrical panel and turn off the breaker for the circuit containing the GFCI outlet. Use your non-contact voltage tester at the outlet to confirm power is off before touching anything.

Step 2: Remove the Old Outlet

1. Unscrew the cover plate and set it aside.
2. Unscrew the two mounting screws holding the outlet to the electrical box.
3. Carefully pull the outlet out from the box — the wires will follow.
4. Use your voltage tester one more time on the exposed wires to confirm they're de-energized.

Step 3: Photograph the Existing Wiring

Before disconnecting anything, take a clear photo of how the wires are connected to the old outlet. This gives you a reference if you get confused during reinstallation.

Step 4: Disconnect the Old Outlet

Loosen the terminal screws and remove each wire. Note which wires were on LINE and which were on LOAD (if any). If wires were in push-in (backstab) connectors, insert a small flathead into the release slot to free them.

You'll typically find:

• Black wire(s) — hot, connects to brass-colored terminals
• White wire(s) — neutral, connects to silver-colored terminals
• Bare copper or green wire — ground, connects to green screw

Step 5: Prepare the New GFCI Outlet

Remove the plastic caps from the LINE terminals on the new Leviton GFTR1-W. Leave the LOAD terminal caps in place unless you're wiring downstream outlets.

If any wire ends look corroded or nicked, use the wire stripper to trim and re-strip to expose about 3/4 inch of clean copper.

Step 6: Connect the Wires to the New Outlet

Connect to the LINE terminals only (unless protecting downstream outlets):

• Black wire — LINE hot terminal (brass screw, labeled LINE HOT or marked with black)
• White wire — LINE neutral terminal (silver screw, labeled LINE NEUTRAL or marked with white)
• Bare copper — green ground screw

Tighten all screws firmly — a loose connection is a fire hazard. Do not use backstab/push-in connectors on a GFCI outlet; always use the screw terminals for a reliable connection.

If you have downstream outlets to protect, connect those wires to the LOAD terminals in the same color pattern (black to LOAD HOT, white to LOAD NEUTRAL).

Step 7: Install and Test

1. Fold the wires carefully into the box and push the outlet in.
2. Secure with the two mounting screws — don't overtighten.
3. Attach the cover plate.
4. Turn the breaker back on.
5. Press the RESET button on the new outlet — you should feel a click.
6. Plug in the Klein Tools RT250 outlet tester — it should show correct wiring.
7. Press TEST on the tester — the outlet should trip. Press RESET to restore power.
8. Check any downstream outlets with the tester to confirm they're also protected.

Choosing the Right Replacement GFCI Outlet

The Leviton GFTR1-W checks all these boxes: 15A, self-testing, tamper-resistant, LED indicator, and fits standard outlet boxes.

When to Call an Electrician

• You find more than 3 wires in the box and aren't sure which are LINE vs LOAD
• The wires are aluminum (silver-colored, not copper) — aluminum wiring requires special handling
• The box is too small to fit the new outlet comfortably
• You see burn marks, melted insulation, or signs of arcing inside the box

Frequently Asked Questions

Do I need to connect the LOAD terminals?

Only if you want the GFCI to protect downstream outlets on the same circuit. If you're just replacing the GFCI outlet itself with no downstream protection needed, connect to LINE only and leave the LOAD terminals capped.

My new GFCI won't reset after installation — what's wrong?

The most common cause is LINE and LOAD wires swapped. Turn off the breaker, pull the outlet out, and verify the incoming power wires are on LINE terminals. Also check that the breaker is on and the circuit has power.

Can I replace a 15A GFCI with a 20A GFCI?

Only if the circuit wiring is 12 AWG (rated for 20A). If the wiring is 14 AWG (15A circuit), use a 15A GFCI. Installing a 20A outlet on a 15A circuit is a code violation.

How long does it take to replace a GFCI outlet?

About 15–25 minutes for most homeowners. The most time-consuming part is usually identifying and photographing the existing wiring before disconnecting it.

Quick Recap

1. Turn off the breaker and verify power is off with a voltage tester
2. Remove the old outlet and photograph the wiring
3. Disconnect the old outlet — note LINE vs LOAD wires
4. Connect wires to LINE terminals on the new GFCI (black to hot, white to neutral, bare to ground)
5. Connect LOAD terminals only if protecting downstream outlets
6. Install, press RESET, and test with an outlet tester
7. Verify downstream outlets are protected

The Leviton GFTR1-W paired with the Klein Tools RT250 tester gives you a professional-grade installation you can verify is working correctly before you close up the wall.

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