Start here when you don't yet know whether the outlet even has power — the tool will fail closed and tell you what to confirm first.
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.
The likely readout
Confirm power before diagnosing further
A GFCI can only reset when its LINE terminals have power. Until that is known, any cause ranking would be a guess — and this tool does not guess.
Do this first: Establish whether this circuit has power: check the panel for a tripped breaker on this circuit, then confirm line-side power with a plug-in tester or a known-good device. Re-run with that answer.
Where to stop. Resetting and plug-in testing are homeowner-safe. Opening the box, checking terminals, or rewiring line/load means live conductors — if you cannot do that safely with the power off at the breaker, stop and call a licensed electrician. Water plus electricity is a shock hazard; do not keep resetting a wet outlet. This is general information, not a quote and not a substitute for a licensed electrician.
Try the safe next check above. If it doesn't resolve it, or would mean working on wiring or a panel, stop and call a licensed electrician — don't replace parts on a guess. Open the full tool to change any answer for your exact situation, or try a related check below.
source-governed · verified 2026-06-20
Sources
code NEC 210.8 — GFCI protection requirements · verified 2026-06-20
standard UL 943 — Standard for Ground-Fault Circuit Interrupters · verified 2026-06-20
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.