Reversed polarity energizes devices on the wrong conductor — a shock hazard even when a device is switched off.
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
Most likely cause
Hot and neutral reversed — the outlet is energized on the wrong conductor, a shock hazard even with a switched-off device plugged in
Ranked by fit to your answers
1
Hot and neutral reversed — the outlet is energized on the wrong conductor, a shock hazard even with a switched-off device plugged in
88
SAFE NEXT CHECKTreat the outlet as unsafe until corrected. Hot and neutral are swapped, so devices are energized on the wrong conductor; the fix is at the receptacle terminals with the power off.
Where to stop. Reading a plug-in tester is homeowner-safe; correcting any miswire means working at the receptacle terminals with live conductors — if you cannot do that safely with the power off at the breaker, stop and call a licensed electrician. A 3-lamp tester cannot detect a bootleg ground, a reversed multi-wire circuit, or undersized wiring. 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 406 — Receptacle wiring and configuration requirements · 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.