On resistance or continuity, OL or infinite resistance means the measured path is open. Possible causes include a broken conductor, a blown fuse, or an open switch; the reading does not identify which cause by itself.
source-governedDiagnostic estimate. Not a quote, not a substitute for a licensed electrician.source pack dated 2026-09-12 · authority hashes pending
Where to stop. Measuring at an accessible outlet or on a disconnected wire/fuse is homeowner-safe with a properly rated meter. Anything that requires probing energized wiring inside boxes or the panel is a licensed electrician's job. Note that digital meters can read phantom (ghost) voltage on a de-energized conductor — confirm a live/dead decision with a low-impedance meter or a solenoid tester, never a single high-impedance reading. Persistent abnormal line-to-neutral voltage can indicate an open neutral or other wiring fault and should be handed to a licensed electrician. 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.