Answer what you can see below. This ranks the likely causes, gives you one safe next check, and tells you clearly when to stop and call a licensed electrician.
Stop and call a licensed electrician or emergency services now if there's smoke, sparks, a burning smell, heat, shock, or water near the problem. Otherwise it's safe to answer the questions below.
What can you see?
Diagnosis
Example result — change the answers on the left and the ranking updates for your situation.
Most likely cause
Moisture intrusion — trips track wet or damp conditions, so water is bridging a small leakage path to ground
Ranked by fit to your answers
1
Moisture intrusion — trips track wet or damp conditions, so water is bridging a small leakage path to ground
85
SAFE NEXT CHECKDry the receptacle and protect it: outdoors, an in-use (bubble) cover and a weather-resistant GFCI keep water off the contacts. If trips stop once it's dry, moisture was the path.
Where to stop. Drying a receptacle, fitting an in-use cover, and unplugging downstream loads are homeowner-safe. Replacing a GFCI or chasing a fault inside boxes means live conductors — if a GFCI keeps tripping with nothing plugged in, that's a wiring fault for a licensed electrician. This is general information, not a quote and not a substitute for a licensed electrician.
Rule trace — why this ranking
Trips correlate with wet/damp conditions, the signature of moisture bridging a small leakage path. +85
What to do next
Try the safe next check above. If it doesn't resolve the problem — or if sorting it out would mean opening a panel, touching wiring, or anything past a simple visual check — stop and call a licensed electrician. Don't replace parts on a guess.
Not your exact situation? Change any answer above and the ranking updates — or try a related situation below.
source-governed · verified 2026-06-20
Sources
standard UL 943 — GFCI trip threshold (Class A, ~4-6 mA) · verified 2026-06-20
code NEC 210.8 — GFCI locations (damp/wet) · verified 2026-06-20
code NEC 406.9 — Receptacles in damp/wet locations (in-use covers) · verified 2026-06-20
Named standards and manufacturer guidance, re-verified on a freshness schedule. When a source cannot be re-verified, the dependent rule is suppressed rather than asserted.
My outdoor GFCI only trips when it rains. Is the outlet broken?
Usually not. Moisture creates a small leakage path the GFCI correctly detects. An in-use (bubble) cover and a weather-resistant GFCI keep water off the contacts; if trips stop once it's dry and protected, moisture was the cause.
It trips only when one specific appliance is running. Why?
That appliance is leaking current to ground — often a failing heating element or breaking-down insulation. Unplug it and the GFCI should hold; the fix is repairing or replacing that appliance, not the outlet.
Can a long run of outlets trip a GFCI on its own?
Yes. Each device and length of wire leaks a little, and across a long downstream run those normal leakages can add up past the trip threshold with no single fault. Splitting the load across circuits usually resolves it.
Electrical Fault Check provides general diagnostic information only. It is not professional advice, not a quote, and not a substitute for a licensed electrician. Do not work on live wiring. If you see smoke, sparks, burning smell, heat, shock, water exposure, or repeated tripping, stop using the circuit and contact a licensed electrician or emergency services as appropriate.