What causes a light switch to stop working but light stays on?
A light that stays on when the switch “does nothing” usually means the switch failed in the ON position or the circuit bypasses the switch. Other common causes include a miswired line/load, loose backstabbed conductors, a failed dimmer or smart switch, 3‑way/4‑way wiring tied incorrectly, or a constant‑hot splice at the fixture. Turn off the breaker before checking; 120 V can shock. Parrish provides 24/7 electrical troubleshooting in Leesburg, Ashburn, and across NoVA.
Quick checks:
- Try the other 3‑way switch, if present.
- Test/replace the switch.
- Inspect fixture wiring for a constant‑hot tie.
Sources
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