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 light was wired to constant power. Three-way switches can also leave a light energized if a traveler is miswired. Smart switches can stick if an internal relay fails. If you notice flickering, scorch marks, or a burning smell, stop using it. Electrical issues can lead to fires or shocks.
Quick checks:
- Try the other 3-way switch, if present.
- Check a fixture pull-chain.
- Don’t flip a hot or sparking switch.
Updated: 2025-11-06 00:00:00
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Sources
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