Model: CO400 | Brand: First Alert
The First Alert CO400 Carbon Monoxide (CO) Detector is designed to provide continuous monitoring of carbon monoxide levels in your home, offering early warning of this odorless, colorless, and poisonous gas. Equipped with an advanced electrochemical sensor, this battery-operated alarm ensures protection even during power outages. Its user-friendly design allows for versatile placement, including an optional wall mount.

Frente view of the First Alert CO400 Carbon Monoxide Detector, showing the test/silence button and First Alert logo.
Carbon monoxide (CO) is a highly toxic gas that can be produced by any fuel-burning appliance. It is invisible, odorless, and tasteless, making it extremely dangerous. CO alarms are crucial for detecting this poisonous gas and providing early warning to protect your family.

Image illustrating the importance of CO detection for family safety.
Este video proporciona un resumenview of First Alert Carbon Monoxide Alarms, including their types, placement recommendations, and essential safety tips. It highlights the importance of early detection and regular testing to ensure home safety.
The First Alert CO400 operates on a 9V replaceable battery. To install or replace the battery:

Trasero view of the detector, highlighting the battery compartment and included 9V battery.
The CO400 detector is battery-operated, offering flexibility in placement without needing an outlet. It can be placed on a tabletop or mounted on a wall.

The CO400 detector mounted on a wall, demonstrating its battery-operated flexibility.

Diagram illustrating recommended placement of CO alarms throughout a typical home.
Once the battery is installed, the CO400 will begin monitoring carbon monoxide levels. It is designed to provide continuous protection.
Regular testing ensures your alarm is functioning correctly. Use the Test/Silence button to perform a test:
If the alarm does not sound during the test, ensure fresh batteries are correctly installed and test again. If it still does not alarm, replace the unit immediately.

Detail of the Test & Silence button on the CO400 detector.
If your carbon monoxide alarm sounds, it indicates the presence of CO. Follow these critical steps:
The CO400 is powered by a 9V battery. An audible and visual low battery signal will alert you when it's time to replace the battery. It is recommended to replace batteries every six months, even if the low battery signal has not yet activated.
The detector is equipped with an end-of-life signal chirp, which indicates when it's time to replace the entire unit. The permanent sensor lasts up to 5 years. For optimal safety, replace your alarm every 5 to 10 years, depending on the manufacturer's instructions and the specific model's lifespan.

Visual representation of the end-of-life warning, indicating when to replace the unit.
To maintain optimal performance, gently vacuum the alarm cover once a month using the soft brush attachment of your vacuum cleaner. Do not paint the unit.
Understanding the different alarm signals can help you identify the issue quickly:
| Señal | Significado | Acción |
|---|---|---|
| 4 beeps and a pause | Monóxido de carbono detectado | Evacuate immediately and call 911. |
| 1 beep every minute | Batería baja | Reemplace la batería de 9V. |
| 5 beeps every minute | Fin de la vida | Replace the entire CO detector unit. |

Dimensions of the First Alert CO400 Carbon Monoxide Detector.
The First Alert CO400 Carbon Monoxide Detector comes with a Garantía limitada de 5 año. Please refer to the included user manual for full warranty details and terms.
For further assistance, technical support, or warranty claims, please contact First Alert customer service:
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