How To Silence A Smoke Detector False Alarm

By Robert Robillard on Home And Personal Safety

How To Silence A Smoke Detector False Alarm

What to Do If You Have a Nuisance or Smoke Detector False Alarm Activation

The other day my daughter called me to tell me the smoke alarms in our house were going off. She told me she had been cooking but there was nothing smoking so she was confused and felt it was a false alarm.  Sometimes smoke detector false alarms occur. If a false alarm is activated, one of the following may be the reason:

  • The battery may be loose
  • The sensor may be dirty
  • Humidity, or steam
  • An electrical surge
  • The alarm is over 10 years old or may have reached the end of its life

Silencing The False Alarm

Always check to make sure that your alarm was not triggered by an actual smoke, CO2 or fire conditions.

Like many alarms, our smoke detectors have a Hush® feature which will desensitize the smoke alarm circuit for up to 8 minutes. Pushing the Test/Hush button on the alarm will end the hush period. This feature should be used only when a known alarm condition, such as from cooking, activates the alarm.

The Hush feature will work if the smoke is not too dense. After 8 minutes the smoke alarm will automatically reset and sound the alarm if particles of combustion are still present. The “Hush” feature can be used repeatedly until the air has been cleared from that area.

On hardwired alarms systems only hushing the initiating unit will silence all other interconnected alarms.  I asked her to check the house first, and then explained to her that she needed to find the smoke alarm that was initiating alarm unit so she could silence it.

Finding the Initiating Smoke Alarm Unit

To find the initiating alarm look for the alarm that has a flashing red light. This light will flash approximately every second

How To Silence A Smoke Detector False Alarm

Smoke Detector False Alarm – No Smoke

That very next morning at 5 am the smoke alarms went off again. Now I realized that it’s was not my daughters cooking but the smoke detectors must have a dirty sensor.

Smoke Detector False Alarm is most commonly caused by something interfering with the sensor. Dust buildup, cobwebs or bugs can trick the sensor into a false alarm or cause a malfunction.

My current smoke alarms are a photoelectric and CO2 combination alarm. I replace my smoke alarms every 10 years [Recommended] and these units are 6 years old. So I’m sure they need cleaning, and if that doesn’t work then replacement.

How To Silence A Smoke Detector False Alarm

Cleaning the Smoke Detector

To clean, after disconnecting the alarm and removing any removable battery: hold the unit by its edge and thoroughly vacuum out the gap between the front cover and the backplate all the way around the perimeter with the crevice tool attachment of a vacuum cleaner. I also use a combination vacuum and compressed air and blow air through the same gap.

This is a great time to replace the battery. Once done reinstall the smoke alarm and see if you’re efforts worked. If you continue to get a smoke detector false alarm, replace the unit. See Updating Your Smoke Alarms

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About the author

Robert Robillard

Robert Robillard

Carpenter / Remodeler / Editor

Rob Robillard is “The Concord Carpenter” Rob is a builder, general contractor, carpenter, woodworker, and editor of Concord Carpenter and ToolBoxBuzzr As a General Contractor and carpenter, Rob owns and operates Concord Carpenter LLC. A full-service remodeling and construction company. Rob is a recognized leader in home building best practices and a source for how-to information for building professionals. On this website, Rob covers all aspects of home construction, building science, home improvement, woodworking, remodeling, and some of the best product and tool reviews. Rob is in charge of our Tool and Product Review series - Concord Carpenter Videos where we post all of our tool reviews and video tutorials. Rob approaches remodeling and building construction with a pragmatic and problem-solving approach. He enjoys using his knowledge and experience to help and educate building professionals as well as DIYers on best practices in the construction and remodeling industry. He's a strong advocate for "raising-the-bar" in the construction trades and promoting the trades to youth. #BeAMentor #Green2Great Craftsmanship, quality, and pride guide his journey on this channel The Concord Carpenter's motto: "Well done is better than well said!" : Read more about Rob

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