Hot and neutral are swapped, so a device is energized on the wrong conductor and is a shock hazard even when switched off. The fix is at the receptacle terminals with the power off.
source-governedDiagnostic estimate. Not a quote, not a substitute for a licensed electrician.source pack dated 2026-06-20 · authority hashes pending
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.
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.