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. A stuck or worn internal switch contact, a shorted switch loop, or a three-way switch wired incorrectly can all cause this. Smart switches can also fail and leave the load on. If you notice dark spots or a burning odor at the faceplate, stop and call a licensed electrician.
Quick checks:
- Flip the switch fully on/off.
- Check the bulb.
- Inspect plug/cord (for lamps).
- Examine the faceplate for dark spots or odors.
- Reset the circuit breaker.
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Sources
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