Your First Alert Carbon Monoxide (CO) Alarm is a critical safety device designed to detect dangerous CO levels in your home. This user manual provides essential guidance on installation, operation, and maintenance to ensure your safety. Carbon monoxide is an odorless, colorless gas that can be deadly, making reliable detection crucial. First Alert alarms offer advanced features like voice alerts and digital displays for early warnings, helping protect you and your family from potential threats.
What is Carbon Monoxide and Its Dangers
Carbon monoxide (CO) is an odorless, colorless, and highly toxic gas produced by incomplete combustion of fuels like gasoline, wood, and natural gas. It is often referred to as a “silent killer” because it is undetectable without proper equipment. Prolonged exposure to CO can cause severe health issues, including headaches, dizziness, nausea, and even death. According to the CDC, CO poisoning is responsible for hundreds of unintentional deaths annually. The gas interferes with oxygen delivery in the bloodstream, leading to tissue damage and organ failure. CO alarms are essential because they detect dangerous levels before symptoms arise, providing critical time to evacuate and seek help. Never ignore a CO alarm, as delayed action can be fatal.
Importance of Carbon Monoxide Alarms in Home Safety
Carbon monoxide alarms are a vital component of home safety systems, serving as the first line of defense against CO poisoning. Unlike smoke, CO is invisible and odorless, making it nearly impossible to detect without an alarm. These devices monitor the air for rising CO levels and sound an alert when dangerous concentrations are detected. According to the CDC, CO alarms can prevent hundreds of deaths annually by providing early warnings. They are especially crucial in homes with fuel-burning appliances, such as furnaces, water heaters, and fireplaces. Installing CO alarms on every level of your home and near sleeping areas ensures maximum protection. Remember, a functioning CO alarm can mean the difference between life and death in an emergency.
Overview of First Alert Carbon Monoxide Alarm Models
First Alert offers a range of carbon monoxide alarm models designed to meet different home safety needs. Popular models include the CO605, CO605B, and CO606, which provide reliable detection of CO levels. These alarms are available in both plug-in and battery-operated options, ensuring flexibility for various households. Some models feature advanced capabilities like digital displays for real-time CO level monitoring and voice alerts for clear warnings. Additionally, certain alarms are combination units that detect both smoke and carbon monoxide, offering comprehensive protection. All models are designed with user-friendly interfaces and adhere to safety standards, ensuring accurate and timely alerts. Refer to the user manual for specific details on each model and installation instructions to maximize their effectiveness.
Installation and Setup Instructions
Refer to the user manual for detailed installation steps. Choose a location on walls or ceilings, ensuring proper placement for accurate detection. Mount the alarm correctly and test it after installation to ensure functionality. Always follow the manufacturer’s guidelines for optimal performance and safety.
Choosing the Right Location for Your CO Alarm

Proper placement of your First Alert Carbon Monoxide (CO) Alarm is essential for effective detection. Install alarms on every level of your home, including basements and near sleeping areas. Place them at least 5 feet away from fuel-burning appliances like furnaces or water heaters to avoid false alarms. Avoid areas near windows, doors, or vents, as drafts may interfere with detection. Follow the user manual for specific guidelines. Ensure alarms are within hearing range to alert everyone in the household. Correct placement ensures the alarm can detect dangerous CO levels and provide timely warnings for your safety.
Step-by-Step Installation Guide
Installing your First Alert Carbon Monoxide Alarm is straightforward. Begin by selecting a suitable location, ensuring compliance with safety guidelines. For battery-operated models, no outlet is required. Use the provided mounting hardware to secure the bracket to the wall or ceiling. Remove the alarm from its packaging and attach it to the bracket. Insert the battery, ensuring it is properly seated. Test the alarm by pressing the test button to confirm it is functioning correctly. Refer to the user manual for specific instructions tailored to your model. Proper installation ensures reliable performance and peace of mind for your home’s safety.

Mounting and Positioning the Alarm Correctly
Proper mounting and positioning of your First Alert Carbon Monoxide Alarm are essential for accurate detection. Install the alarm on walls or ceilings, at least 5 feet away from fuel-burning appliances like furnaces or water heaters. Avoid areas near windows, doors, or vents to prevent drafts from interfering with sensor accuracy. For optimal coverage, place one alarm on each level of your home and near sleeping areas. Use the provided mounting hardware to secure the bracket firmly to the wall or ceiling. Ensure the alarm is level and facing downward to prevent debris from entering the sensor. Refer to the user manual for model-specific installation requirements to ensure proper functionality and safety.

Understanding the Alarm Features
Your First Alert CO Alarm offers advanced features like voice alerts, digital displays, and distinct warning sounds to ensure clear notifications. These features enhance safety and provide immediate alerts for dangerous CO levels, helping you respond quickly and effectively to potential threats.
Types of Alerts and Warning Sounds

Your First Alert CO Alarm uses distinct alerts to signal different conditions. Four short beeps indicate a carbon monoxide detection, while three chirps signal a low battery. Some models feature voice alerts, clearly stating “Carbon Monoxide” or “Low Battery” for easy understanding. These sounds are designed to grab attention and ensure prompt action. Familiarizing yourself with these alerts is crucial for responding correctly. Always consult your user manual for specific sound patterns and meanings, as they may vary slightly by model. Understanding these alerts ensures you can take appropriate steps to protect yourself and your family from potential threats. Never ignore these warnings, as they are critical for safety.
Battery vs. Hardwired CO Alarms: Pros and Cons

Battery-powered CO alarms offer ease of installation and flexibility in placement, as they don’t require wiring. However, they need regular battery replacements, which can be inconvenient and costly over time. Hardwired alarms provide a more reliable power source and are less prone to tampering, but installation is more complex and may require professional assistance. Some hardwired models include backup batteries for continued operation during power outages. Battery alarms are ideal for renters or temporary setups, while hardwired systems are better for long-term, whole-home protection. Both options ensure safety, but the choice depends on your specific needs and preferences. Always follow the manufacturer’s instructions for installation and maintenance.
Additional Features like Digital Displays and Voice Alerts
Modern First Alert CO alarms often include advanced features like digital displays and voice alerts to enhance safety and user experience. Digital displays provide real-time CO level readings, allowing you to monitor conditions accurately. Voice alerts offer clear, audible warnings, such as “Carbon monoxide detected,” to ensure immediate attention. These features are particularly beneficial for households with individuals who may not easily hear traditional beeps or need visual confirmation. Some models also include peak level memory, which records the highest CO levels detected, aiding in identifying recurring issues. These innovations make First Alert alarms more user-friendly and effective in protecting your home. Always refer to your user manual for specific feature details and operation guidance.
Testing and Maintenance
Regularly test your CO alarm by pressing the test button to ensure it functions properly. Clean the sensor with a soft brush to remove dust. Replace batteries annually or as indicated in the user manual. Check for any error codes or LED indicators that may signal maintenance needs. Proper upkeep ensures your alarm remains reliable and ready to detect dangerous CO levels, safeguarding your home and family.
How to Test Your CO Alarm Properly

To ensure your First Alert CO Alarm is functioning correctly, press and hold the test button until the alarm sounds. This verifies the horn and sensor are working. Use a soft brush to gently clean the sensor to remove dust or debris. Test the alarm monthly and after battery replacement. If your model has a digital display, check for error codes or LED indicators, which may signal maintenance needs. Refer to your user manual for specific instructions. Regular testing ensures your alarm detects dangerous CO levels reliably, providing critical early warnings to protect your family. Always follow the manufacturer’s guidelines for accurate results.
Cleaning and Maintaining the Alarm for Optimal Performance
Regular cleaning and maintenance are essential to ensure your First Alert CO Alarm operates effectively. Use a soft brush or vacuum cleaner to gently remove dust and debris from the sensor and grill. Avoid using harsh chemicals or liquids, as they may damage the unit. Check the alarm for any physical damage or wear. For battery-powered models, ensure the battery compartment is clean and free of corrosion. Replace batteries annually or as indicated by the manufacturer. If your alarm has a digital display, wipe it with a soft cloth to maintain visibility. Proper maintenance ensures accurate detection and reliable performance, keeping your home and family safe from carbon monoxide threats.
When to Replace the Battery or the Alarm Itself
Replace the battery in your First Alert CO Alarm annually or when the low-battery signal sounds. For hardwired models, replace backup batteries every 6 months. If your alarm is more than 5 years old, replace it entirely, as the sensor’s accuracy may degrade over time. Look for end-of-life signals, such as a steady light or chirp, indicating the alarm needs replacement. Always follow the manufacturer’s guidelines for replacement intervals. Failure to replace batteries or the alarm when needed can result in reduced protection against carbon monoxide threats. Refer to your user manual for specific instructions on replacing batteries or the entire unit to ensure continuous safety.
Troubleshooting Common Issues
Common issues with First Alert CO Alarms include false alarms, chirping sounds, or error codes. Check for proper installation, clean the sensor, and ensure no power outages. Refer to your user manual for specific solutions, such as resetting the alarm or addressing low battery signals. Addressing these issues promptly ensures reliable performance and continuous protection against carbon monoxide threats.
Why Your CO Alarm Might Be Beeping or Chirping
Your First Alert CO Alarm may beep or chirp due to a low battery, power outages, or detected carbon monoxide. False alarms can occur from dust, humidity, or cooking fumes. Check the user manual for specific error codes and LED indicators, as they provide clues about the issue. For example, a steady beep indicates a CO detection, while chirping often signals a low battery. Ensure proper installation and cleaning of the sensor to avoid nuisance trips. If the alarm continues to sound, evacuate the area and contact a professional to investigate potential CO sources. Always prioritize your safety and never ignore persistent alerts.
Resolving False Alarms and Nuisance Trips
False alarms or nuisance trips on your First Alert CO Alarm can occur due to non-emergency conditions like cooking fumes, humidity, or dust. To resolve this, first, check the user manual for error codes or LED indicators, which can help identify the issue. If the alarm sounds without a CO threat, press the test/silence button to temporarily mute it. Ensure the alarm is clean by gently vacuuming the sensor. Relocate the alarm if it’s near kitchens or bathrooms, where steam or fumes are common. After addressing the issue, test the alarm to confirm it’s functioning correctly. Never disable the alarm permanently, as this compromises your safety. If false alarms persist, consider replacing the unit.
Understanding Error Codes and LED Indicators
Your First Alert CO Alarm uses error codes and LED indicators to communicate its status. The LED light flashes in different patterns to signal various conditions: red for an active alarm, yellow for a caution or fault, and green for normal operation. Error codes, often accompanied by specific beep sequences, indicate issues like low battery, sensor problems, or system malfunctions. Refer to your user manual for a detailed explanation of these codes and lights. For example, three beeps followed by a pause may indicate a fault, while four beeps signal a CO detection. Understanding these indicators helps you address issues promptly, ensuring your alarm functions correctly and keeps you safe. Always consult the manual for precise troubleshooting guidance.

Safety Guidelines and Best Practices

Never ignore your CO alarm. If it sounds, immediately evacuate the premises and call emergency services. Delaying action can lead to severe health risks or death.
What to Do When the CO Alarm Sounds
If your First Alert CO Alarm sounds, stay calm but act quickly. Immediately evacuate everyone, including pets, from the premises. Do not return inside under any circumstances. Call emergency services or your local fire department from a safe location. Open windows and doors only if it’s safe to do so. Check for symptoms of CO poisoning, such as dizziness or nausea, and seek medical attention if necessary. Do not re-enter your home until authorities confirm it is safe. Remember, never ignore your CO alarm, as delaying action can lead to severe health risks or death. Always consult your user manual for model-specific guidance.
Preventing Carbon Monoxide Poisoning in Your Home
Preventing carbon monoxide (CO) poisoning starts with understanding its sources and taking proactive steps. Ensure all fuel-burning appliances, like furnaces and water heaters, are installed and maintained properly. Never use generators, grills, or cars indoors, as they emit deadly CO. Keep chimneys and vents clear of blockages to ensure proper ventilation. Regularly inspect appliances for damage or wear. Install First Alert CO Alarms on every level of your home and near sleeping areas for early detection. Stay informed about the dangers of CO and educate household members. By combining these measures, you can significantly reduce the risk of CO exposure and protect your family’s safety.
Never Ignore Your CO Alarm: The Risks of Delay
If your First Alert CO Alarm sounds, never delay taking action. Carbon monoxide is a silent killer, and ignoring the alarm can lead to severe health risks or even death. CO poisoning progresses rapidly, causing symptoms like dizziness, nausea, and confusion, which can quickly escalate. Failing to respond promptly can result in unconsciousness or long-term neurological damage. Always evacuate the premises immediately and contact emergency services. Do not return until authorities confirm the area is safe. Remember, your CO alarm is a lifesaving device—ignoring it puts you and your family at grave risk. Act swiftly to ensure everyone’s safety and well-being.

Additional Resources and Support
Visit the First Alert website for detailed user manuals, installation guides, and troubleshooting tips. Contact customer support for assistance with your CO alarm. Explore online FAQs for quick answers.
Where to Find the User Manual and Guides
To access the user manual for your First Alert Carbon Monoxide Alarm, visit the official First Alert website. Manuals for models like the CO605 and CO5120BN are available for download. You can also find guides on product pages or through the customer support section. Additionally, the user manual is included in the product packaging. For specific instructions, refer to the model number listed on your device. If you need further assistance, contact First Alert customer support directly via phone or email for personalized help.
Customer Support and Warranty Information
For assistance with your First Alert Carbon Monoxide Alarm, contact First Alert customer support at (877) 370-1130 or via email through their official website. The warranty for most models covers defects in materials and workmanship for a specified period, typically up to 5 or 7 years, depending on the product. To ensure warranty validity, register your device on the First Alert website. For detailed warranty terms, refer to the user manual or visit the support section online. Remember to follow all instructions carefully to maintain warranty coverage and ensure optimal performance of your CO alarm.
Online FAQs and Troubleshooting Guides
Visit the First Alert website for comprehensive online FAQs and troubleshooting guides to address common issues with your Carbon Monoxide Alarm. These resources cover topics like alarm beeping, error codes, and false alarms. For specific models such as the CO605 or CO606, detailed guides are available to help resolve issues quickly. Additionally, the support section offers step-by-step solutions for troubleshooting and maintaining your device. Always refer to the official user manual for model-specific instructions. If you can’t find the information you need, contact First Alert customer support for further assistance. These online tools ensure you can address any problem efficiently and keep your home safe.