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EZSMART Corporation, ESA/ECRA #7012690 , North York , Ontario
Mon-Fri 08:00 AM - 05:00 PM
EZSMART Corporation, ESA/ECRA #7012690 , North York , Ontario
Mon-Fri 08:00 AM - 05:00 PM
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09 Jul, 2026
Posted by Amir Azimipour
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How Do I Fix a Light That Will Not Turn Off?

Electrical Q&A
How Do I Fix a Light That Will Not Turn Off?

A light that stays on regardless of the switch position is unusual, and while it is often not immediately dangerous, it points to a wiring or switch issue that needs proper diagnosis. Here is how to think about it, from the licensed electricians at EZSMART, serving Toronto and the GTA.

Most Likely Causes

  • Failed switch: The switch has failed internally, staying in the closed (on) position regardless of physical position
  • Miswiring: A miswiring in the switch or fixture is bypassing normal switching
  • Smart bulb or smart switch issue: If you have smart lighting, a firmware or connectivity issue may keep the light on
  • Three-way wiring problem: In a three-way setup, a wiring fault can prevent proper switching from one or both locations
  • Dimmer failure: A failed dimmer switch can occasionally lock in an on state

What to Try First

  1. If it is a smart bulb or switch, check the app for connectivity or reset issues
  2. Turn off the breaker for that circuit to confirm it is truly a switch issue and not a broader wiring problem
  3. If the light goes off with the breaker but not with the switch, the switch or its wiring is the likely cause
  4. Do not attempt to open the switch yourself. Diagnosis requires proper testing and often uncovers wiring conditions that a homeowner is not equipped to address safely

Why This Matters

A switch that no longer opens the circuit properly can also indicate arcing or degraded contacts inside, which can lead to heating and, over time, connection failure. Replacing the switch is typically inexpensive, but the diagnosis should be professional. Any switch replacement should be performed by a licensed electrician in accordance with Electrical Safety Authority standards. Quality replacement switches from manufacturers like Leviton or Legrand are standard options.

Frequently Asked Questions

Is it safe to leave a light that will not turn off on until an electrician comes?
Usually yes, though turning off the breaker for that circuit is a reasonable precaution.

Could this be a bulb issue?
Only for smart bulbs, since a regular bulb has no ability to stay lit if the switch has opened its circuit properly.

How much does replacing a failed light switch cost?
Replacement itself is inexpensive, though a service call minimum typically applies for a licensed electrician\’s visit.

Have a light that will not turn off? EZSMART provides licensed switch diagnostics and replacement across Toronto and the GTA. Call 416-838-9006, and see what our customers say on our Google reviews page.

Amir Azimipour

Electrician Since 2008 Journeyman Electrician Designated Master Electrician at EZSMART Corp

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