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What causes a light switch to stop working but light stays on?

A light that stays on usually means the switch isn’t interrupting power. The contacts may have failed closed. The switch could be part of a 3-way and the other switch is controlling the light. A smart switch may be set to “always on” or have a stuck relay. Miswiring or a loose backstab connection can bypass the switch. If you smell burning, cut power at the breaker and call us.

Quick checks:

  • Try the other 3-way switch.
  • For smart switches, check the app or reset.
  • Use the breaker to turn the light off until serviced.
<br/> Updated: 2025-11-05 00:00:00 <br/>

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