GFCI outlet won't reset? 5 causes, from a $0 fix to a real fault

A GFCI that won't reset has a short list of causes. Two cost nothing, one costs $20, and one means there's a genuine ground fault somewhere on the circuit. Work down the list in order — the cheap checks come first for a reason.

Cause 1: No power to the outlet ($0)

A GFCI can't reset without power. Press RESET firmly — it takes more force than you'd think, and you should feel a click. If nothing happens:

1. Check the breaker. Kitchen, bath, garage, and outdoor GFCIs are often on their own circuits, and the breaker label may not match the room.
2. Check for another GFCI upstream. This is the one everyone misses. One GFCI can protect a whole string of regular outlets downstream — and sometimes another GFCI. Your garage outlet may be dead because the GFCI in the bathroom on the other side of the wall tripped. Press RESET on every GFCI in the house, including outdoor ones under the weatherproof covers.

Cause 2: Something plugged in is faulty ($0)

Unplug everything on the circuit — not just this outlet, every outlet that goes dead when this one trips. Reset. If it holds, plug things back in one at a time. The device that trips it is the problem; a hair dryer, an old fridge, a sump pump, or a string of holiday lights with a nicked cord are the usual offenders. Don't bypass the GFCI to keep using that device.

Cause 3: Moisture ($0, wait it out)

Outdoor and garage GFCIs trip after rain, sprinklers, or a pressure washer. Water in the box or the downstream outlets creates a real leakage path. Leave it off, let it dry a day (a hair dryer on the box speeds it up), then reset. If it keeps happening every time it rains, the weatherproof cover or the box seal has failed — a $10–$25 "in-use" bubble cover fixes most of these.

Cause 4: The GFCI itself is worn out ($15–$25)

GFCIs have a working life of 10–15 years, and ones made before 2006 don't have the self-test circuitry that newer ones do. Signs it's the device:

• RESET won't click in at all, with power confirmed at the breaker.
• It resets, then trips with nothing plugged in anywhere on the circuit.
• The TEST button doesn't trip it. That one matters — a GFCI that won't trip on TEST isn't protecting anything. Replace it today.

Replacing a GFCI is the same as replacing any outlet, with one wrinkle: there are LINE terminals (power in) and LOAD terminals (to the downstream outlets). Mix them up and the GFCI won't reset — which is a surprisingly common reason a brand-new one "doesn't work."

1. Kill the breaker. Confirm with a non-contact tester on the outlet.
2. Pull the old GFCI. Note which pair of wires was on LINE (usually the pair from the bottom of the box or the one marked on tape). If in doubt, photograph it.
3. If there's only one cable in the box, it all goes on LINE. If two, the one that's live with the breaker on (test carefully, or use the logic that LINE comes from the breaker side) goes on LINE, the other on LOAD.
4. Wire, mount, restore power, press RESET, press TEST (should trip), press RESET again.

Buy a 20-amp GFCI for kitchen and garage circuits, 15-amp elsewhere. $15–$25. Fifteen minutes.

Cause 5: A real ground fault in the wiring (electrician)

If the GFCI is new or known good, nothing is plugged in anywhere downstream, it's dry, and it still trips the instant you reset — current is leaking to ground somewhere in the walls. Common culprits: a nail or screw through a cable, a rodent-chewed wire, a box with a loose neutral touching the ground, or a buried outdoor cable that's degraded.

This is where you stop. Finding it means isolating sections of the circuit at each box, and the fault could be in a wall or underground. An electrician charges $150–$300 for the diagnosis and usually fixes it in the same visit unless it's a buried cable ($500–$1,500 to re-run). The Find a Pro page gets two to four licensed electricians in your zip.

While you're thinking about it

Press TEST on every GFCI in the house once a month. It takes 90 seconds. A GFCI that doesn't trip on TEST is just an outlet with a button on it, and the places they're required — kitchens, baths, garages, outdoors — are exactly where you'd want the protection to work. If any of them are the old style without a little green or red indicator light, they're probably past their service life; replace them in a batch and it's a $100 afternoon. Our tools page has the tester and screwdriver that make this painless.