Symptoms
- Outlet trips every few minutes or hours
- Trips only when a specific appliance runs
- Trips more often in humid or rainy weather
Likely causes
- CommonA specific appliance with a minor internal leakOlder motors, like in a refrigerator or power tool, can trip sensitive GFCIs even without a real hazard.
- CommonMoisture in an outdoor or bathroom boxCondensation or splashed water is a classic trigger, especially outdoors.
- PossibleA shared neutral with another circuitMultiwire circuits sharing a neutral can confuse a GFCI and cause nuisance trips.
- PossibleA degrading GFCI deviceAging GFCIs can become overly sensitive over years of use.
- PossibleDamaged cord or plug on a connected deviceCracked insulation lets a tiny amount of current leak to ground.
What to do
- Note exactly what's plugged in when it trips, since one device is often the culprit.
- Unplug all devices, reset the GFCI, then plug items back in one at a time to isolate the cause.
- Inspect that device's cord and plug for cracks, fraying, or discoloration.
- For outdoor or bathroom units, check for water pooling in or around the box.
- Try the suspected appliance on a different, non-GFCI outlet elsewhere to confirm it's the source.
- If no single device is at fault and it still trips randomly, the GFCI itself may need replacing.
- Keep a log of when it trips if the pattern isn't obvious, to help a technician diagnose it.
Tools and parts
- Notebook or phone to track trips
Replacement GFCI outletSearch: “15 amp GFCI outlet”
When to call a pro
Call an electrician if trips continue after isolating and removing every plugged-in device, since that points to a wiring issue.
Safety
Use caution
Stop using any cord or appliance that looks cracked, melted, or discolored, and don't force a GFCI to stay reset by holding the button.