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

A light that stays on while the switch does nothing usually means the switch failed in the ON position or the circuit is miswired. It can also be a 3-way or smart-control issue holding the light powered. Our licensed electricians will diagnose on site, present a quote, and complete most repairs the same day. We have Chelsea and Danvers electricians on call 24/7 with fully stocked trucks, serving Boston and nearby towns.

Quick checks:

• Try the other 3-way switch.
• If it’s a smart bulb/switch, test it in the app.
• Stop and call if you smell burning or see sparks.

<br/> Updated: 2025-11-07 <br/>

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