How to Fix a Beeping Smoke Alarm


A smoke detector that senses smoke in a residential or commercial structure emits a loud beep to alert the homeowner or building occupants that smoke is present, likely the result of a fire. Typically mounted on a wall or ceiling, smoke detectors feature a 9-volt battery as either a primary or backup power source. Replacing the battery on a regular basis is an essential part of residential and commercial property safety. A loud beep will typically sound every minute or so when the battery is in need of replacement.

Things You'll Need

  • Smoke detector
  • Circuit breaker panel
  • 9-volt battery
  • Locate the circuit breaker in the electrical control panel that controls power to the smoke detector for a detector that is wired. Flip the breaker off to disconnect the power to the detector.

  • Place a step ladder under the smoke detector, if necessary, so the battery access door is easily accessible.

  • Open the battery compartment door.

  • Pull the 9-volt battery from the smoke detector and remove the flat battery plug from the end of the battery.

  • Install a new 9-volt battery into the battery plug. Snap the plug onto the battery securely.

  • Place the battery into the battery compartment of the smoke detector and close the compartment door.

  • Return to the electrical control panel and turn the power back on to the smoke detector. Flip the circuit breaker back on that controls power to the detector.

Tips & Warnings

  • Most detectors have a test button. After installing the battery, press the test button. The smoke detector should emit a sharp beep. This will let you know that you installed the battery correctly.
  • Safety experts advise changing the batteries in smoke detectors twice a year. An easy way to remember to do this is to change the batteries when the country goes on daylight savings time, and again when everyone returns to standard time.

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