How To Install a Hardwired Smoke/Carbon Monoxide Detector

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Smoke and carbon monoxide detectors should be replaced every 5-7 years. The carbon monoxide detector law has been in place in Illinois since 2007 so if you’ve never changed yours, it’s probably about time. If yours is hardwired into your home, this project will involve some light electrical work. We recommend anyone that does not feel confident with this kind of project seek professional help (like an electrician! Not a psychiatrist).


  • Alarm unit
  • Flat head screwdriver


  1. Turn off power
  2. Remove alarm unit
  3. Remove old bracket
  4. Disconnect old wires
  5. Connect new wires
  6. Install new bracket
  7. Connect harness and test

This project should take less than 30 minutes and your only cost will be the smoke/carbon monoxide detector itself.

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