The ranking is rules, not opinion — here is exactly how an answer set becomes a ranked result and a safe next check.
source-governedDiagnostic estimate. Not a quote, not a substitute for a licensed electrician.source pack dated 2026-09-13 · authority hashes pendingview sources ↓
Method
The tester's printed legend is the authority for the named indication; the engine decodes the condition name rather than assuming a universal lamp-color pattern across brands.
GFCI behavior is evaluated separately from the wiring lamps — the TEST button is a protection check, while trips during normal service are a separate leakage or nuisance signal.
The cited RT250 manual documents limits including ground quality, multiple hot wires, neutral/ground reversal, and most combinations of defects, so a 'correct' read is treated as limited evidence rather than a clean bill of health.
Sources
manufacturer Klein RT250 instructions — wiring-condition legend, GFCI test and documented limitations · source pack dated 2026-09-13 · authority hashes pending
Where to stop. Reading a plug-in tester and using its TEST function as directed by the manufacturer are homeowner-safe observations. Do not open a receptacle box, move conductors, or attempt wiring correction; those are licensed-electrician tasks. The cited RT250 does not indicate ground quality, multiple hot wires, neutral/ground reversal, or most combinations of defects. 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.