Tools · Hand tools and quick fixes

Testing and resetting a GFCI outlet

A GFCI is the outlet with TEST and RESET buttons. It cuts power in a fraction of a second when electricity leaks somewhere it shouldn't, like through you. Test each one monthly and after a power outage: plug in a lamp, press TEST (the light should go off), press RESET (it should come back). If a kitchen or bathroom outlet is dead, find the GFCI upstream and press RESET.

Easy5 min a monthFreeChecked October 2, 2026

What to know

Know what you're looking at. A ground fault circuit interrupter (GFCI, sometimes GFI) protects you from severe shocks. It can be built into an outlet, a circuit breaker or a power cord. Source: CPSC
Find them. The electrical code now requires GFCIs in kitchens, bathrooms, garages and outdoors. Source: ESFI Older homes may not have them everywhere, because the code mostly applies to new construction and major renovations. Source: CPSC
Test it. Plug a lamp into the outlet and turn the lamp on. Press TEST. The light should go out. Source: CPSC
Reset it. Press RESET. The light should come back on. Source: CPSC
Test every GFCI at least once a month, after a power failure, and as the manufacturer's instructions say. Source: CPSC They can fail without any sign, so regular testing may save your life. Source: CPSC ESFI also says to test them once a month. Source: ESFI
Have a GFCI breaker in your panel? Push its test button. The handle should move to the middle or off position. To reset it, move the handle all the way to off, then back to on. Source: CPSC
Map what each one controls. One GFCI outlet also protects the outlets "downstream" on the same circuit. Source: CPSC After you press TEST, check which other outlets went dead, and write it down.

Watch out Light stayed on after you pressed TEST? The GFCI isn't working or wasn't installed correctly. Don't count on it. Call a qualified electrician, or your landlord if you rent. Source: CPSC If the light won't come back after RESET, the GFCI needs replacing. Source: CPSC

If it doesn't work

Bathroom outlet dead, but no buttons on it? It may be downstream of a GFCI somewhere else, like another bathroom, the garage or outside. Source: CPSC Check those for a tripped RESET button before you go to the panel.
Keeps tripping when you plug in one thing? A GFCI trips when it detects a ground fault, and those most often happen when equipment is damaged or defective. Source: CPSC Stop using that appliance or tool until it's checked.
Whole room dark, no GFCI tripped? Check the breaker panel. See Finding your water shutoff and breaker panel.
Working outside, or in a room with no GFCI? A portable GFCI plugs into a regular outlet and protects whatever you plug into it. CPSC suggests one for electric yard equipment and power tools. Source: CPSC
Thinking of swapping in a GFCI yourself? CPSC says to call a qualified electrician if you have any doubt about the right wiring procedure. Source: CPSC If you rent, that's your landlord's call.

Good to know

How it works

A GFCI constantly compares the current going out on a circuit with the current coming back. If they differ by as little as 0.006 amps, it cuts the power faster than you can blink, before the shock can affect your heartbeat Source: CPSC).

Why it matters

Since the 1970s, GFCIs have saved thousands of lives and helped cut home electrocutions in half. Source: ESFI Because they detect ground faults, they can also prevent some electrical fires. Source: CPSC

Where you want one

Anywhere water and electricity might meet, indoors or out. Source: ESFI CPSC also suggests GFCIs in unfinished basements and near laundry tubs and wet bar sinks. Source: CPSC

A monthly routine (made-up example)

First Saturday of the month, with the smoke alarm test: nightlight in the kitchen GFCI, TEST, RESET. Then the bathroom, the garage and the outdoor outlet. Ninety seconds total. Note any that fail and text the landlord the same day.

Message to a landlord (made-up example)

"Hi, the GFCI outlet by the kitchen sink in 2A doesn't cut power when I press TEST. The lamp stays on. Can an electrician check it this week? I'm not using that outlet until then."

Sources

U.S. Consumer Product Safety Commission GFCI fact sheet (PDF)
U.S. Consumer Product Safety Commission Home electrical safety checklist (PDF)
Electrical Safety Foundation International Ground fault circuit interrupters
Electrical Safety Foundation International Understanding your home electrical system

Lesson T1.4 · Last checked October 2, 2026 against the sources listed.

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