How to Change the Battery on a First Alert CO Sensor

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Carbon monoxide alarms measure CO levels in the air. CO can be caused by faulty heating equipment, particularly flues. Combustible materials use oxygen to burn and produce carbon monoxide as a by-product. Carbon monoxide is a lethal--and, unfortunately, odorless--gas. A carbon monoxide detector will sound an alarm if it detects CO gas nearby. To keep your CO detector functioning properly make sure its batteries are fresh.

Things You'll Need

  • 2 AA batteries
  • Slide the First Alert CO detector off the wall when the device chirps roughly every minute--that's the low battery warning. Wall-mounted detectors are simply hooked onto some exposed screws.

  • Flip open the battery door.

  • Remove the used batteries and insert two new AA batteries. (Make sure the polarity is correct when inserting the batteries: the plus and minus signs on the batteries should be aligned with the plus and minus signs on the detector.) The detector will produce a little chirp if you've got it right.

  • Close the battery compartment.

  • Slide the device back onto its exposed screws by aligning the eyelets under the detector with the screws in the wall.

  • Press and hold the test button until the LED flashes. The detector should then sound four beeps followed by a pause and another four beeps. The red light will flash. This indicates the device is working.

Tips & Warnings

  • Test your carbon monoxide alarm frequently.
  • Never ignore a CO detector. CO is invisible, odorless and tasteless. CO levels can rise slowly or quickly. Eco-friendly homes, which are air-tight, can be especially problematic should a flue become blocked, because carbon monoxide gas can get trapped in the house.

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