Kidde Nighthawk Carbon Monoxide Detector Manual: A Comprehensive Guide
This comprehensive guide details the Kidde Nighthawk CO detector, covering installation, operation, troubleshooting, and vital safety information for homeowners and families.
Understanding the alarm’s functions and potential recalls (like KN-COSM-IB, 2004-2010) is crucial for protecting against the dangers of carbon monoxide poisoning.
Proper placement, regular testing, and awareness of the end-of-life chirp are essential for reliable performance, ensuring your home remains a safe environment.
Understanding Carbon Monoxide
Carbon monoxide (CO) is a colorless, odorless, and tasteless gas produced by the incomplete combustion of fuels such as natural gas, propane, oil, and wood. Because it’s undetectable by human senses, it’s often called the “silent killer.” Exposure to CO can cause flu-like symptoms, dizziness, weakness, nausea, vomiting, headaches, and confusion.
High levels of CO can lead to loss of consciousness, brain damage, and even death. Sources of CO in the home include malfunctioning furnaces, water heaters, fireplaces, stoves, and generators. Proper ventilation is critical, but a Kidde Nighthawk CO detector provides an essential layer of protection.
This detector doesn’t prevent CO from being produced, but it alerts you to its presence, allowing you to evacuate and seek fresh air. Understanding the dangers of CO and the importance of early detection is the first step in ensuring your family’s safety. Regularly reviewing safety procedures is also vital.
What is the Kidde Nighthawk CO Detector?
The Kidde Nighthawk Carbon Monoxide (CO) detector is a safety device designed to alert you to the presence of this dangerous, invisible gas in your home. It’s an essential component of a comprehensive home safety plan, offering peace of mind by providing early warning of potentially life-threatening CO levels.
Available in both battery-operated and hardwired models, the Nighthawk detector utilizes an electrochemical sensor to detect CO. Some models combine CO detection with smoke detection, offering dual protection. The Nighthawk series is known for its reliability and ease of use, making it a popular choice for homeowners.
However, it’s crucial to be aware of potential recalls, such as the KN-COSM-IB model manufactured between 2004 and 2010, which may experience end-of-life failures. Regularly checking the model number and manufacture date is vital for ensuring proper functionality.
Key Features of the Nighthawk Model
The Kidde Nighthawk CO detector boasts several key features designed for optimal safety and user convenience. These include a loud, 85-decibel alarm, ensuring audibility throughout the home, even for those with impaired hearing. Many models feature a digital display showing current CO levels, providing real-time monitoring.
Furthermore, the Nighthawk often incorporates a peak level memory, recording the highest CO concentration detected, useful for post-incident analysis. A test button allows for regular functionality checks, confirming the sensor and alarm are operating correctly. Some combination models also include a smoke alarm function.
Importantly, the detector includes an end-of-life chirp, signaling when the unit needs replacement (typically after seven years). However, recent recalls highlight potential failures in this chirp function, necessitating proactive checks of model numbers and dates.
Model Numbers and Date Codes
Identifying your Kidde Nighthawk CO detector’s model number and date code is crucial, particularly given recent recall information. The primary model affected by the recall is KN-COSM-IB, a talking combination smoke/CO alarm. Locate these identifiers on the back of the unit.
The date code indicates the manufacturing date, essential for determining if your alarm falls within the affected range of June 1, 2004, to December 31, 2010. This date is typically formatted in a specific manner, often a four-digit code representing the year and week of manufacture.
Carefully compare your alarm’s model number and date code against the official recall notices issued by Kidde and the U.S. Consumer Product Safety Commission. Accurate identification is the first step in ensuring your family’s safety and determining if a replacement is necessary.
Recall Information: Affected Models (KN-COSM-IB)
Kidde issued a significant recall affecting the NightHawk talking combination smoke/CO alarm, specifically model number KN-COSM-IB. This recall stems from a defect where the alarm may fail to chirp, even after battery replacement, creating a false sense of security. Consumers might believe the unit is still functioning when it is not providing adequate protection.
The U.S. Consumer Product Safety Commission (CPSC) is actively involved in disseminating recall information. This issue poses a serious risk, as the alarm’s inability to signal its end-of-life could leave homes unprotected against dangerous carbon monoxide levels.
If you own a KN-COSM-IB, immediately check the manufacturing date (see the “Model Numbers and Date Codes” section). Contact Kidde Safety for a free replacement unit to mitigate this potentially life-threatening hazard.
Manufacturing Dates of Recalled Units (June 1, 2004 – December 31, 2010)
The recall issued by Kidde specifically targets NightHawk combination smoke/CO alarms (model KN-COSM-IB) manufactured within a defined timeframe. Units produced between June 1, 2004, and December 31, 2010, are affected by the potential failure to chirp at the end of their service life, even with new batteries installed.
Determining your alarm’s manufacturing date is crucial. Locate the date code on the back of the unit. If the date falls within this range, your alarm is subject to the recall and should be replaced immediately. This date is vital for confirming eligibility for a free replacement.
Consumers are urged to verify their alarm’s date code to ensure their home’s safety. Ignoring this recall could result in undetected carbon monoxide, posing a severe health risk to occupants.

Installation and Placement
Proper installation is key for optimal performance; choose recommended locations, avoiding hazardous areas like bathrooms or garages, and consider hardwired or battery options.
Mounting the detector correctly, following provided instructions, ensures reliable carbon monoxide detection and safeguards your home and family from potential dangers.
Recommended Installation Locations
For optimal protection, install the Kidde Nighthawk CO detector centrally located on each level of your home, including the basement. It’s crucial to place detectors near sleeping areas, as early warning during sleep is paramount.

Specifically, consider hallways outside bedrooms and living rooms. Mount the detector on a wall or ceiling, following the manufacturer’s instructions for appropriate height. Ensure the alarm is easily audible from all sleeping areas.

Install detectors at least 10 feet away from fuel-burning appliances such as furnaces, stoves, and water heaters to avoid false alarms caused by brief, localized CO spikes. However, ensure it’s within range of potential CO sources.
Multiple detectors are recommended for larger homes or those with complex layouts, providing comprehensive coverage and increased peace of mind. Regularly check the detector’s placement to confirm it remains unobstructed and functional.
Avoiding Incorrect Placement (Hazardous Locations)
The Kidde Nighthawk CO detector should never be installed in or near hazardous locations, as outlined in the National Electric Code. Avoid placement in excessively humid areas like bathrooms or laundry rooms, where moisture can cause malfunctions.
Do not install the detector near air vents, windows, or doors, as drafts can dilute CO and hinder accurate detection. Garages and areas with ongoing combustion processes are also unsuitable, potentially triggering false alarms.
Furthermore, avoid locations directly above or below fuel-burning appliances, or in confined spaces where CO may accumulate rapidly. Dusty or dirty environments can also compromise the detector’s sensitivity and lifespan.
Incorrect placement can lead to delayed detection or false alarms, diminishing the device’s effectiveness. Always refer to the manual for specific guidance and ensure the installation site meets all safety requirements.
Hardwired vs. Battery-Operated Models
Kidde Nighthawk CO detectors are available in both hardwired and battery-operated models, each offering distinct advantages. Hardwired units connect directly to your home’s electrical system, providing continuous power and often interconnectivity with other alarms.
Battery-operated models offer flexibility in placement, as they don’t require proximity to an electrical outlet. However, they rely on battery power, necessitating regular battery checks and replacements to ensure consistent operation.
The recalled KN-COSM-IB model is primarily hardwired, but can still experience failure even with battery backups. Regardless of the type, proper battery maintenance is crucial for all models.

Choosing between hardwired and battery-operated depends on your home’s layout and preferences, but consistent power and reliable operation are paramount for effective CO detection.
Mounting Instructions
Proper mounting is critical for optimal performance of your Kidde Nighthawk CO detector. For hardwired models, disconnect power at the circuit breaker before installation. Securely attach the mounting bracket to the wall or ceiling using the provided screws.
Ensure the detector is positioned according to recommended installation locations, avoiding areas with obstructed airflow. For battery-operated units, follow similar bracket mounting procedures, ensuring easy access for battery replacement.
Avoid mounting in hazardous locations as defined by the National Electric Code. Carefully connect the wiring for hardwired models, following all electrical safety guidelines.
Once mounted, test the alarm to verify proper functionality. Regularly inspect the mounting to ensure it remains secure, contributing to reliable CO detection and peace of mind.

Operation and Functionality
The Nighthawk CO detector utilizes advanced sensing technology, providing audible alarm sounds to indicate CO presence, requiring immediate attention and evacuation.
Regular testing ensures operational readiness, while understanding the end-of-life chirp signals the need for replacement, maintaining continuous protection for your family.
Alarm Sounds and What They Mean
The Kidde Nighthawk CO detector employs distinct alarm patterns to clearly communicate the nature of the detected hazard. A series of four beeps, repeated continuously, signifies the presence of carbon monoxide. This is not a fire alarm; it specifically indicates dangerous CO levels.
If this alarm sounds, immediately evacuate all occupants and pets from the building, moving to fresh air. Call emergency services (911) or your local fire department from a safe location. Do not re-enter the premises until it has been deemed safe by qualified personnel.
Different models, particularly combination smoke/CO alarms, may have varying sounds for smoke versus CO. The Nighthawk talking alarm verbally announces the threat (“Carbon Monoxide!” or “Fire!”). A single chirp indicates a low battery or an end-of-life condition, requiring attention but not immediate evacuation. Familiarize yourself with your specific model’s sound patterns for effective response.
Ignoring any alarm sound is extremely dangerous. Always treat every alarm as a potential life-threatening situation until proven otherwise.
Testing the CO Detector
Regular testing of your Kidde Nighthawk CO detector is paramount to ensure its continued functionality. It is recommended to test the alarm at least monthly. Most models feature a dedicated “Test” button, typically located on the device’s face. Pressing and holding this button initiates a self-diagnostic check.
During the test, the alarm should emit a loud, distinct pattern – often a series of beeps. If the alarm does not respond or the sound is weak, it indicates a potential malfunction. Replace the unit immediately if it fails the test. Do not rely on a malfunctioning detector for protection.
Remember that the test function only verifies the alarm’s circuitry and sounder; it does not confirm the sensor’s ability to detect CO. Consistent monthly testing, alongside regular maintenance, provides the best assurance of reliable CO detection.
Always test after battery replacement or if the unit has been moved.
Understanding the End-of-Life Chirp
The Kidde Nighthawk CO detector is designed with a limited lifespan, typically seven to ten years. As the unit nears the end of its operational life, it will begin to emit a distinct chirping sound – this is the “end-of-life chirp.” This chirp is not an indication of a CO leak; it signifies the detector needs replacement.
This feature is crucial because the sensor’s accuracy degrades over time, potentially leading to unreliable readings. Ignoring the chirp and continuing to rely on an expired detector compromises your safety. Replace the entire unit immediately upon hearing the end-of-life signal.
Importantly, some older models, particularly those involved in recalls, may fail to chirp even after battery replacement, creating a false sense of security. Regularly check the manufacture date to ensure your detector is within its service life.
Do not disable or ignore this critical warning signal.
Battery Replacement Procedures
To replace the batteries in your Kidde Nighthawk CO detector, first locate the battery compartment, usually on the back or side of the unit. Gently open the compartment cover. Remove the old batteries, noting the correct polarity (+ and -) as indicated inside the compartment.
Insert fresh batteries of the correct type – typically AA or AAA, as specified on the detector. Ensure proper alignment with the polarity markings. Close the battery compartment cover securely. After replacement, test the alarm to confirm it’s functioning correctly.
Regular battery replacement, even with long-life batteries, is vital. However, remember that even with new batteries, the detector has a limited lifespan and will eventually require full unit replacement signaled by the end-of-life chirp.
Always use quality batteries for optimal performance;

Maintenance and Troubleshooting
Regular cleaning, inspection, and addressing false alarms are key to maintaining your Kidde Nighthawk CO detector’s reliability and ensuring continued safety.
Troubleshooting chirping issues and understanding alarm responses are vital for proper operation and peace of mind within your home environment.
Regular Cleaning and Inspection

To ensure optimal performance, your Kidde Nighthawk CO detector requires periodic cleaning and visual inspection. Dust, dirt, or insects can accumulate over time, potentially interfering with the sensor’s ability to accurately detect carbon monoxide.
Gently vacuum the exterior of the detector using the brush attachment of your vacuum cleaner at least every six months. Avoid using water, cleaning solvents, or detergents, as these can damage the sensor.
Visually inspect the detector for any signs of physical damage, such as cracks or loose components. Ensure the test button is not obstructed and functions correctly when pressed.
Confirm the alarm’s power source (battery or hardwired connection) is secure and functioning as expected. For battery-operated models, replace the battery at least once a year, or when the low-battery warning chirp sounds.
Consistent maintenance contributes significantly to the longevity and reliability of your CO alarm, safeguarding your home and family.
Addressing False Alarms
False alarms from your Kidde Nighthawk CO detector can be unsettling, but understanding their causes is crucial. Common triggers include temporary fluctuations in carbon monoxide levels, humidity, or the presence of certain household chemicals.
If the alarm sounds, immediately ensure fresh air circulation by opening windows and doors. If the alarm persists after ventilation, investigate potential CO sources like malfunctioning fuel-burning appliances.
Avoid placing the detector near steam sources (bathrooms, kitchens) or areas with high humidity, as these can trigger false readings. Ensure the detector isn’t exposed to cleaning agents, hairspray, or other aerosols.
If false alarms continue despite troubleshooting, consult the manual or contact Kidde customer support. Never disable the alarm to silence false triggers; prioritize safety and investigate the root cause.
Remember, a functioning CO detector is vital, and addressing false alarms promptly ensures continued protection for your family.
What to Do When the Alarm Sounds
If your Kidde Nighthawk CO detector sounds, immediate action is critical. First, remain calm and evacuate everyone – including pets – to fresh air immediately. Do not investigate the source of the alarm while inside the building.
Once safely outside, call 911 or your local emergency number. Do not re-enter the premises until emergency responders have deemed it safe. They will identify the CO source and ensure it’s neutralized.
If anyone experiences symptoms of CO poisoning – headache, dizziness, nausea, shortness of breath – seek medical attention immediately. Inform medical personnel about the potential CO exposure.
Do not attempt to locate the CO source yourself; leave that to qualified professionals. Ensure proper ventilation before returning indoors, and have the appliance inspected before reuse.
Prioritize safety above all else; a sounding CO alarm indicates a potentially life-threatening situation requiring swift and decisive action.
Troubleshooting Chirping Issues
A chirping Kidde Nighthawk CO detector often signals a low battery, requiring immediate replacement with a fresh one. However, persistent chirping after battery replacement, particularly in older models (June 2004 – Dec 2010), could indicate end-of-life.
These units have a seven-year lifespan; chirping may cease upon battery change because the alarm is no longer functional. If the unit is within its lifespan, ensure the battery is correctly installed and compatible.
False chirps can occur due to temporary power fluctuations or humidity. If the chirping persists, try resetting the alarm by pressing the test/silence button. Avoid disassembling the unit.
If the alarm continues to chirp despite troubleshooting, and it’s an affected model within the recall timeframe, contact Kidde for a free replacement. Do not ignore persistent chirping – it’s a safety concern.
Remember, a chirping alarm may not be malfunctioning, but signaling a critical issue requiring attention or replacement.

Safety Information
Prioritize family safety by educating children about CO alarms and their purpose; never allow them to tamper with the device for any reason.
Understand the difference between natural gas and carbon monoxide, and always follow the warnings and cautions detailed within this Kidde manual.
Educating Children About CO Alarms
It’s vitally important to teach children the significance of the Kidde Nighthawk CO alarm and how to react appropriately when it sounds. Explain that the alarm isn’t a game or a toy, and they should never play with it or attempt to disconnect it.
Emphasize that the alarm’s sound signifies a potentially dangerous situation requiring immediate action. Instruct them to immediately inform a responsible adult – a parent, guardian, or trusted caregiver – if the alarm activates.
Practice a family escape plan, designating a safe meeting point outside the home. Ensure children understand they must follow the plan without hesitation. Reinforce that even a seemingly quiet or brief alarm chirp warrants attention and reporting to an adult.
Age-appropriate explanations are key; avoid overly frightening language, but stress the seriousness of CO poisoning and the alarm’s role in protecting them. Regularly review these safety procedures to reinforce their understanding.
Gas vs. Carbon Monoxide – Clarification
Throughout this Kidde Nighthawk CO detector manual, the term “gas” specifically refers to natural gas or propane – fuels commonly used for heating and cooking. It’s crucial to understand that these gases are different from carbon monoxide (CO), a colorless, odorless, and poisonous gas.
Natural gas and propane are detectable by smell (often with added odorants), while CO is not. The Kidde alarm is designed to detect CO, a byproduct of incomplete combustion of fuels like gas, wood, oil, or kerosene.
A gas leak and CO poisoning are distinct hazards requiring different responses. While a gas smell necessitates immediate ventilation and contacting the gas company, a CO alarm indicates a potentially life-threatening situation demanding evacuation and calling emergency services.
This distinction is vital for ensuring appropriate action when either a gas odor or the CO alarm is triggered, safeguarding your family’s health and well-being.

Important Warnings and Cautions
This Kidde Nighthawk CO detector is an essential safety device, but it’s not a substitute for proper appliance maintenance. Regularly inspect and service fuel-burning appliances to prevent CO production.
Never ignore the alarm! Even if no one feels sick, evacuate immediately and call emergency services. False alarms are possible, but always prioritize safety. Do not disable the alarm to silence a nuisance alarm without investigating the cause.
The detector is not suitable for hazardous locations as defined by the National Electric Code. Ensure proper installation and avoid placement in excessively humid or dusty environments. This device is designed for indoor use only.
Kidde Safety reserves the right to update this manual and its contents. Always refer to the latest version available on kiddesafetyeurope.co;uk for the most current information and safety guidelines.
Kidde Safety’s Rights and Manual Contents
Kidde Safety, a division of UTC, retains all rights to this manual and the information contained within, including design, specifications, and instructions. This document provides comprehensive guidance for the Nighthawk Carbon Monoxide detector, aiming to ensure user safety and proper operation.
The manual details installation procedures, alarm functionality, troubleshooting steps, and crucial safety warnings. Throughout, “gas” specifically refers to natural gas or propane, clarifying potential hazards. Understanding CO versus other gases is vital.
This guide covers models like KN-COSM-IB, acknowledging potential recall issues (manufactured June 1, 2004 – December 31, 2010). Regularly check kiddesafetyeurope.co.uk for updates and revisions to this manual, ensuring you have the latest safety information.

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