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

A light switch that does nothing while the light stays on usually means the switch contacts are stuck closed or the switch was bypassed. Miswiring is common, especially on 3-way switches where travelers are swapped. The light may also be controlled by another switch, or a fixture pull-chain is set to ON. If you smell smoke or hear buzzing, stop and call an electrician.

Quick checks:

  • Is the switch fully ON/OFF?
  • Has the circuit breaker tripped?
  • Try the other switch if it’s a 3-way.

Updated: 2025-11-06

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