Why does my GFCI outlet keep tripping?
Updated August 2026
When a GFCI keeps popping, the culprit is nearly always moisture inside an outdoor, bathroom, or garage box, or a genuine ground fault in something plugged in downstream. Both leak a few milliamps toward ground, which is exactly what the GFCI is built to catch. Dry out the box, add a weatherproof cover, and unplug suspect appliances one at a time. If it still trips with everything unplugged and the box bone dry, the problem is in the wiring.
Safety first: a GFCI that keeps tripping is doing its one job, cutting power the instant current leaks toward ground, which near water is the difference between a startle and an electrocution. Do not swap it for a standard outlet or jam the reset to defeat it. Find the wet box or the leaking appliance instead, and if the GFCI trips with nothing plugged in and the box completely dry, treat it as a wiring fault and call an electrician.
Causes, most likely first
| Cause | How likely | The fix | Typical cost |
|---|---|---|---|
| Moisture in the box | Most common | Dry an outdoor or bathroom receptacle, add an in-use bubble cover, and reset. Rain, sprinklers, and shower steam are the usual source. | $0–25 |
| Faulty downstream appliance | Common | A leaky heater, aging fridge, or worn power tool leaks current to ground. Unplug items one by one until the tripping stops. | Free |
| Worn-out GFCI | Common | GFCIs wear out and get trip-happy after 10 to 15 years. Replace the device itself. | $15–25 part |
| Overloaded or very long circuit | Occasional | A circuit with many outlets accumulates enough tiny leakage to trip the GFCI. A pro may split the circuit. | $150–300 |
| Miswired line/load or shared neutral | Occasional | Reversed line and load terminals or a shared neutral causes phantom trips. An electrician rewires it correctly. | $100–250 |
Check these first
- Unplug everything on the GFCI and its downstream outlets, reset it, and see if it holds. If it does, plug items back one at a time.
- Check for moisture: open outdoor covers, feel bathroom and garage boxes, and look for condensation or water intrusion after rain.
- Press TEST then RESET. A GFCI that will not reset at all is a different problem than one that trips under load.
- Trace what it feeds. One GFCI often protects several downstream outlets, so the fault may sit a room away.
- Note the weather. Trips that happen only when it rains or the sprinklers run point straight at moisture.
Prevent it next time
Most nuisance trips vanish with a weatherproof in-use cover on outdoor receptacles and a quick monthly press of the TEST button, which is also how you catch a GFCI that has quietly stopped protecting you. Plan to replace a GFCI on schedule once it passes its 10- to 15-year life, since a worn one trips more and protects less. Skipping the monthly test is cheap until it is not: here is what a dead GFCI can cost you.
When to call a pro
Handle the moisture and appliance checks yourself. Call a pro when the GFCI trips instantly with nothing plugged in and no moisture present, when it will not reset at all, or when replacing the device does not stop the trips. Those point to a wiring fault in the box or downstream. A service call runs $100–200, a GFCI replacement is $120–250 installed, and tracing a hidden ground fault is $150–350. Near water, that is money well spent.
Most of the causes above are maintenance problems wearing a disguise. OnOtto keeps the boring prevention on schedule so the 2 a.m. version doesn't happen.
Stop chasing symptoms, free for 30 daysFrequently asked questions
Why does my GFCI only trip when it rains?
Water in the box or on a downstream cord is leaking a small current to ground, and the GFCI cuts power to protect you. Outdoor receptacles need a weatherproof in-use cover, the bubble kind, not just a flip lid, and any outdoor cord connection should sit off wet ground. Dry the box, add the cover, and the rain-only trips usually stop. If they keep happening, an outlet or fixture downstream is still letting water in and needs attention.
How do I find which appliance is tripping my GFCI?
Unplug everything the GFCI feeds, including the downstream outlets it protects, then reset it. If it holds, plug devices back one at a time and wait a while between each. The one that trips it is your culprit, often an aging fridge, a space heater, a well-used power tool, or a submersible pump with a breaking-down winding. A single failing appliance leaking a few milliamps to ground is enough. Repair or retire that device.
Can a GFCI outlet just go bad?
Yes. GFCIs contain electronics that wear out, and after 10 to 15 years they get trip-happy or stop protecting entirely, which is why monthly testing matters. If yours trips with nothing plugged in, no moisture, and everything downstream unplugged, the device itself is likely done. A replacement runs $15–25 for the part and about $120–250 installed. If a fresh one still trips, the problem is in the wiring rather than the outlet.
Is a GFCI trip the same as a breaker trip?
Not quite. A GFCI reacts to a current imbalance of roughly 5 milliamps leaking to ground and trips to prevent shock. A breaker trips on overload or short circuit to protect the wire. If the whole circuit is dead and the panel breaker is off, that is a breaker issue; see why a breaker keeps tripping. If only the GFCI and its downstream outlets are dead, the GFCI caught something.