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First Alert Carbon Monoxide Detectors

Battery Operated Carbon Monoxide Detectors

Battery CO Alarms

Battery operated carbon monoxide alarms provide tremendous flexibility as they can immediately be setup and installed without a wired connection.
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Hardwired Carbon Monoxide Detectors

Hardwired CO Alarms

Hardwired carbon monoxide alarms come equipped with all of the necessary equipment needed for seamless installation and quick activation.
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Plug-In Carbon Monoxide Detectors

Plug-In CO Alarms

By removing installation obstacles and simplifying the installation process, plug-in co detectors represent an excellent solution for safeguarding a surrounding area from the dangers of carbon monoxide.
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10 Year Carbon Monoxide Alarms

10 Year Carbon Monoxide Alarms

Ten Year CO Alarms offer a decade's worth of uninterrupted protection against the the silent killer, carbon monoxide.
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Carbon Monoxide Alarms and Detectors

All Carbon Monoxide Alarms

Carbon monoxide alarms featuring a variety of different features including; 10 year battery, child awakening, voice location, combo alarms and more.
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First Alert Carbon Monoxide Alarm

A First Alert carbon monoxide alarm is an essential safety device for every home. Carbon monoxide (CO) is an odorless, colorless, and potentially deadly gas produced by fuel-burning appliances such as furnaces, stoves, fireplaces, and vehicles. Because CO is impossible to detect without an alarm, installing CO detectors in key areas of your home is critical. First Alert recommends placing a carbon monoxide alarm on every level of your home, near sleeping areas, and inside bedrooms to ensure early detection and maximum protection. By alerting you to dangerous CO levels, these alarms give your family valuable time to get to safety.

Battery Operated Carbon Monoxide Alarms

Battery operated carbon monoxide alarms provide flexible installation and reliable protection, even during a power outage. They are ideal for homes without hardwiring or for placing alarms in areas where electrical outlets are not accessible. Many models feature long-life batteries, making them convenient and low-maintenance. Their portability also allows you to move them as needed, which is especially useful for renters or seasonal homes.

Hardwired Carbon Monoxide Alarms

A hardwired carbon monoxide alarm connects directly to your home’s electrical system, ensuring continuous power supply. Most models also include a backup battery to keep your family protected if the power goes out. Hardwired alarms can often be interconnected, meaning when one alarm detects carbon monoxide, all alarms in the home sound simultaneously. This feature provides an added layer of safety, ensuring everyone is alerted regardless of where the CO source is located.

Plug-In Carbon Monoxide Alarms

For simple, no-hassle installation, a plug-in carbon monoxide alarm is an excellent choice. These alarms plug directly into any standard wall outlet and typically include a battery backup for continuous protection. They are ideal for apartments, condos, and other spaces where easy installation and portability are important. Some plug-in models also feature digital displays that show current CO levels, giving you real-time monitoring.

First Alert Combination Smoke Alarm and Carbon Monoxide Detector

A combination smoke and carbon monoxide alarm offers the ultimate convenience by protecting your home against both smoke and CO threats in one device. These alarms save space, simplify maintenance, and provide comprehensive coverage for your household. With both sensors built into a single unit, you reduce the number of devices needed while ensuring maximum protection from two of the most dangerous home hazards.

Frequently Asked Questions About First Alert Carbon Monoxide Alarms

Why is my First Alert carbon monoxide alarm beeping?

First Alert carbon monoxide alarm 3 beeps - Carbon Monoxide Detected! A pattern of 3 beeps, pause, 3 beeps is the alarm for dangerous levels of CO gas in your home. Unlike low-battery or end-of-life chirps, this pattern is continuous and louder, alerting you to act immediately.
  1. Move to fresh air right away – Get everyone, including pets, outside into fresh air.
  2. Call emergency services – Do not ignore the alarm; CO is odorless and invisible but can be deadly.
  3. Do not re-rnter the home – Only go back inside when emergency responders confirm it's safe.
  4. Have appliances checked – Contact a qualified technician to inspect fuel-burning appliances, fireplaces, chimneys, and any potential CO sources.
First Alert carbon monoxide alarm 5 beeps - Five beeps in a row, or one set of 5 chirps every minute, indicates that the alarm has reached the end of its service life (usually 7–10 years, depending on the model). At this stage, the alarm can no longer provide reliable protection and must be replaced.
  1. Check the alarm's age – Look for the manufacture date on the back of the unit. If it is close to or past 7–10 years, it has expired.
  2. Replace the alarm – A First Alert carbon monoxide alarm that issues a 5-beep pattern cannot be reset or repaired. The entire unit should be replaced with a new one.
  3. Do not ignore the signal – An expired alarm may not detect dangerous CO levels, putting your household at risk.

Why is my First Alert carbon monoxide alarm chirping?

A chirping sound usually means the battery is low or the alarm has reached the end of its life. Replace the battery or, if the alarm is 7–10 years old, replace the entire unit.

How do i change my First Alert carbon monoxide alarm battery?

  1. Remove the CO Alarm from Its Mounting Bracket
    • Twist or slide the alarm away from the wall or ceiling bracket.
  2. Open the Battery Compartment
    • Most First Alert CO alarms have a small battery drawer on the back or side. Press the tab or slide it open.
  3. Take Out the Old Battery
    • Carefully remove the old battery. Check for any corrosion or debris inside the compartment.
  4. Insert the New Battery
    • Use the correct type (commonly a 9-volt or AA battery depending on the model).
    • Match the + and – ends of the battery with the markings inside the compartment.
  5. Close the Compartment and Re-Attach the Alarm
    • Ensure the battery drawer clicks shut completely - some alarms will not stop chirping if it's not closed all the way.
    • Reattach the alarm to its bracket.
  6. Test the Alarm
    • Press and hold the Test button until you hear a loud beep pattern. This confirms the new battery is installed correctly.
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