How To Change Batteries On First Alert Smoke And Carbon Monoxide Alarm

Last updated: October 1, 2023


The First Alert Combination Smoke and Carbon Monoxide Alarm is the perfect device for anyone who wants to keep their family safe. The dual sensors detect smoke or carbon monoxide, which are both dangerous substances that can cause accidents in homes where there’s not a lot of ventilation, like apartments with fireplaces or even small children running around on the floor while they cook dinner. With an easy-to-set alarm system (you just plug it into your outlet), this will make sure you’re always notified when something goes wrong! I think one of these should be installed by every major appliance so people don’t live life without knowing what could happen at any moment.

Additionally, the CO sensor detects carbon monoxide leaks from multiple sources – for example, faulty fuel-burning appliances and generators running inside or too close to homes. The loud 85-decibel siren will alert you to the threat while the unique alarm sounds on its face distinguish a smoke warning versus a CO leak warning.

This smoke and carbon mono oxide alarm are battery-operated, so you don’t need an electrician for installation. Requiring just two AA batteries and featuring an easy-access battery compartment for quick changes, this unit has a single button that allows you to silence a false alarm or test the unit in case of an emergency.

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How to Replace a 9V Battery

  1. So, firstly use a plastic tab to open the battery lid gently.
  2. Now take the old batteries out.
  3. Look at the battery to identify the (+) and (-) contacts. While installing the battery in your alarm, ensure that they match the same polarity in the battery drawer. Note: the negative side has a larger opening in the back of the battery drawer, so it will get fit one way without forcing it closed.
  4. Insert the fresh battery into the compartment with the positive (circular ◯ ) contact closest to the middle of the detector. The negative (hexagonal ⬢ ) contact needs to be closer to the outer of the detector. 
  5. Now is the time to close the battery compartment. If it won’t close, it is possible that the battery is inserted in the wrong direction. 


Does CO rise or sink?

Carbon monoxide is light in weight than air and can be found with warm, rising currents of air. Therefore it’s important to place detectors on a wall about 5 feet up from the floor or ceiling for maximum coverage in your house!

What do four beeps mean on a carbon monoxide detector?


4 Beeps and a Pause: This means that carbon monoxide has been detected in the area; you should move to fresh air and call 9-1-11. 1 Beep Every Minute: Low Battery – it is time to replace your battery with this free offer! 5 beeps every minute? That’s no good, my friend; The End of Life for our CO alarm has come!

How do I know if my First Alert carbon monoxide detector is working?

The alarm sequence should last 5-6 seconds. If the unit does not sound, make sure it has been activated correctly and test again for warnings of a fire or other emergency in your home.

How do I make my first alert alarm stop beeping?

Clear Residual Charge to Stop the Chirp

You might have the best alarm system in your house, but if it’s not working correctly, you’re at risk. In order to ensure that everything is set up from scratch and ready for use when needed, most call a professional electrician or any other qualified technician who can make sure of these things during installation.

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