Product Overview
The Kidde Nighthawk CO alarm offers plug‑in operation, a digital display showing CO levels updated every 15 s, tamper‑resist alerts, a peak‑level button, and an end‑of‑life warning. It interconnects with Kidde/Nighthawk units for safety.
Model Variants and Designations
Kidde Nighthawk offers several CO alarm configurations tailored to different installation preferences and feature sets. The base model, KN‑COP‑DP‑LS, is a plug‑in unit with a digital display and a tamper‑resist feature. A battery‑backed version, KN‑COP‑DP‑LP, adds a low‑power backup to maintain operation during outages. The high‑performance variant, KN‑COPP‑3, incorporates a larger display and a more robust alarm horn. For residential use, the KN‑COPP‑B‑LP model provides a battery‑backed option with a longer end‑of‑life warning. Each designation follows Kidde’s naming convention: “KN” indicates a Kidde product, “COP” denotes carbon monoxide, “DP” or “P” specifies plug‑in or plug‑in with battery backup, “LS” or “LP” indicates low‑power or low‑power backup, and the trailing “3” or “B” references the display size or battery‑backed variant. Interconnectable units share the same designation scheme, allowing seamless integration across multiple alarms. These designations also encode the alarm’s power source and end‑of‑life status, allowing installers to quickly determine if a unit needs a battery replacement or is ready for interconnection with Kidde/Nighthawk devices, now setup.
Key Specifications
Model KN‑COP‑DP‑LS is a plug‑in CO detector that uses a 120 V AC supply and includes a 3‑year battery backup. The digital display shows CO concentration in parts per million (ppm) and updates every 15 seconds. The alarm threshold is 70 ppm, with a 100 ppm high‑level alarm. A tamper‑resist switch triggers a flashing red LED and audible alarm if the unit is unplugged or the back cover is removed. The peak‑level button records the highest CO reading since the last reset, and the end‑of‑life indicator lights after 10 years of use, prompting replacement. The unit supports interconnection with other Kidde/Nighthawk CO alarms via a 3‑wire cable, allowing a single alarm to trigger all linked devices. The enclosure is UL‑listed, meets UL 2034, and is rated for 120 V AC. The power consumption is 0.5 W during idle and 1.5 W during alarm. The device is compliant with FCC Part 15 and CE standards, and it is rated for indoor use only.
The alarm’s 30day test cycle ensures continuous operation, and the 10‑year end‑of‑life indicator prompts timely replacement. A 2hour battery backup guarantees detection during power outages, while the 3‑wire interconnect allows multiple units to share a single alarm source!
Digital Display Functionality
The Kidde Nighthawk CO alarm’s digital display is a 2‑digit LED panel that continuously shows the current CO concentration in parts per million (ppm). The reading refreshes every 15 seconds, allowing users to monitor changes in real time. When the alarm is triggered, the display flashes red and the LED turns on to indicate a CO level above the 70 ppm threshold. A dedicated peak‑level button records the highest CO reading since the last reset; pressing this button temporarily shows the peak value on the same LED panel. The display also includes a battery‑status indicator that lights green when the backup battery is healthy and amber when the battery is low, prompting a replacement before the 3‑year backup period expires. During a power outage, the unit automatically switches to battery mode, and the display shows “BAT” to alert users that the alarm is operating on backup power. The display is backlit for low‑light visibility and is protected by a UL‑listed enclosure. All information is presented in a clear, easy‑to‑read format, ensuring that users can quickly assess CO levels and take appropriate action. Users should check the display regularly and replace the battery when the indicator turns amber.
Installation and Setup
Plug the unit into a grounded outlet, ensuring the plug is secure. Test the alarm with the Test/Reset button, then reset. Verify interconnect by pressing the test button on a connected unit. Follow safety instructions. Ensure ventilation!!
The Kidde Nighthawk CO alarm is designed for residential use, operating on 120‑volt, 60‑Hz AC. The unit draws a maximum of 1.5 A, ensuring safe plug‑in operation without overloading circuits. Before installation, verify the outlet is free of damage and the plug is firmly seated; a loose connection can trigger the tamper‑resist alarm. The alarm includes a built‑in surge protector to guard against voltage spikes and automatically shuts down if disconnected, preventing false alarms. Avoid placing the unit near heat sources, vents, or large appliances that may interfere with the sensor. The plug‑in design eliminates the need for batteries, but the unit will continue to function if a battery backup is installed. Follow the manufacturer’s wiring diagram and safety guidelines to ensure compliance with local electrical codes. The alarm’s power supply is certified by UL, guaranteeing rigorous safety standards for residential use. When testing, press the Test/Reset button to confirm the unit is receiving power and that the digital display updates every 15 seconds with CO concentration. The display shows CO ppm and updates every 15 seconds. It also provides an alarm when CO exceeds safe limits!
Mounting Locations and Interconnect
Place the Kidde Nighthawk CO alarm on a wall or ceiling at least 3 ft above the floor to avoid false readings from hot air. The unit should be mounted on a flat surface, not near windows, vents, or high‑temperature appliances. For optimal detection, install it in rooms where CO may accumulate, such as kitchens, garages, or near furnaces. The alarm can be inter‑connected with other Kidde or Nighthawk CO detectors using the included 3‑wire cable. Connect the red, black, and white wires to the corresponding terminals on each unit, ensuring proper polarity. Interconnects allow simultaneous alarms and a single test button to activate all linked units. The cable must be routed through wall cavities or along baseboards, keeping it away from electrical wiring to prevent interference. When interconnecting, close the back cover to secure the connections; opening the cover will void the warranty. The interconnect feature also enables the alarm to detect a CO spike in any connected unit and trigger all alarms, providing comprehensive protection throughout the home. The interconnect cable must be rated for 120 V and installed in a dry area avoiding parallel runs with electrical wiring to reduce interference more.
Initial Test and Reset Procedure
Before first use, perform a full test to confirm the alarm’s circuitry and audible horn are functioning. Press and hold the Test/Reset button for 3 seconds until the alarm chirps twice, then releases. The unit will emit a series of tones and the digital display will flash “TEST” for 15 seconds. If the alarm does not sound or the display does not change, check that the unit is properly plugged into a grounded outlet and that the outlet is supplying 120 V. To reset the alarm after a CO detection or a false alarm, press the Test/Reset button once; the alarm will silence, the display will show “RESET” for 5 seconds, and the CO level will return to “0 ppm.” For a complete reset that clears the peak‑level memory, press and hold the Test/Reset button for 10 seconds until the display flashes “RESET” and the peak‑level indicator clears. After any reset, allow the unit to stabilize for 30 seconds before re‑testing. If the alarm continues to sound or the display remains stuck, unplug the unit, wait 30 seconds, then re‑plug and repeat the test procedure. This ensures the alarm’s internal diagnostics are clear and ready for normal operation. Stay!!!
Tamper Resist Feature and Alerts
The Kidde Nighthawk CO alarm incorporates a tamper‑resist system that monitors the unit’s connection to the electrical outlet. If the alarm is unplugged, becomes loose, or is otherwise disconnected, the tamper sensor immediately triggers a warning sequence. The alarm’s red LED will flash rapidly, and the built‑in speaker will emit a continuous voice message: “Carbon monoxide alarm unplugged. Please reconnect the unit.” This alert persists until the alarm is re‑plugged and the unit is reset. The tamper‑resist feature is designed to prevent accidental removal of the alarm during a CO event, ensuring that the device remains operational at all times. When the alarm is re‑connected, the LED will cease flashing, the voice message will stop, and the unit will automatically resume normal monitoring. If the tamper condition is not resolved within a short period, the alarm will repeat the warning at 30‑second intervals to draw attention. Users should avoid tampering with the back cover or attempting to remove the unit, as such actions will also trigger the tamper sensor and void the warranty. The tamper‑resist system is a critical safety component that works in tandem with the CO detection circuitry to provide continuous protection. Tamper alarm persists after reconnection, contact Kidde support.
Alarm Features
The Kidde Nighthawk CO alarm delivers audible alerts, a flashing red LED, and voice messages when CO levels rise. It automatically resets after a 30‑second silence, ensuring continuous protection. UL certified now!
Alarm Operation and CO Detection
The Kidde Nighthawk CO alarm activates a 1 kHz tone and flashing red LED when CO levels reach 50 ppm for 15 seconds or 70 ppm for 5 seconds, meeting UL 2034 standards. Its catalytic sensor reacts within 30 seconds, and the alarm persists until CO drops below 50 ppm for 30 seconds, after which it auto‑resets. A 3‑second test button confirms circuitry and silences the alarm. Low‑battery and tamper‑resist LEDs notify users of power loss or unplugging. The digital display updates CO concentration every 15 seconds, and a peak‑level button shows the highest reading since the last reset. An end‑of‑life indicator alerts after 10 years, prompting replacement. The unit interconnects with other Kidde/Nighthawk CO detectors, providing networked alerts throughout the home. The alarm’s firmware is designed for low power consumption, and the unit’s firmware can be updated via the manufacturer’s support portal. In addition, the alarm includes a built‑in memory that logs CO levels and alarm events, allowing users to review historical data through the display. The unit’s interconnect capability ensures that if one alarm detects CO, all connected alarms will sound, providing comprehensive coverage throughout the dwelling.!!! !!
Peak Level Button and Historical Readings
The Kidde Nighthawk CO alarm’s peak‑level button records the highest CO concentration detected since the last reset. Pressing the button displays the peak value on the 2‑digit digital screen, which updates every 15 seconds. The alarm stores this data in non‑volatile memory, allowing users to review historical CO levels by cycling the display or using the reset function. When the unit is reset, the stored peak value clears, and the display returns to real‑time readings. This feature helps homeowners track CO trends over time and verify that the alarm is functioning correctly. The peak‑level indicator also assists in troubleshooting by showing whether the alarm has detected elevated CO during a test or real event. The memory retention ensures that even after power loss, the last peak value remains accessible until a new reset occurs. The historical data can be accessed only via the built‑in interface; no external software is required. The button’s operation is straightforward: a single press shows the peak, a long press resets the alarm and clears the stored data. This design aligns with Kidde’s safety standards and provides users with reliable, actionable information about CO exposure in their home.
End‑of‑Life Warning System
The Kidde Nighthawk CO alarm incorporates an end‑of‑life (EOL) warning that alerts owners when the unit has reached the manufacturer’s recommended service life of ten years. The alarm monitors the elapsed time since the first use of the device and, once the threshold is met, the digital display flashes a red “EOL” icon while the audible alarm sounds. This dual‑mode notification ensures that even if a user is not actively monitoring the display, the audible alert will prompt them to replace the unit. The EOL feature is built into the alarm’s firmware and does not require battery replacement or manual activation. When the EOL condition is triggered, the alarm will continue to function normally for a limited grace period of 30 days, allowing the homeowner to procure a replacement. After this grace period, the alarm will cease to operate until a new unit is installed. The EOL warning is designed to comply with Kidde’s safety standards and to prevent the use of a sensor that may no longer provide accurate readings due to sensor degradation. Users are advised to replace the alarm promptly upon receiving the EOL alert to maintain continuous protection against carbon monoxide exposure. The replacement unit should be installed according to the same plug‑in procedure, and the old unit should be disposed of in accordance with local hazardous waste regulations. The EOL system is a critical component of Kidde’s commitment to long‑term safety and reliability.
Interconnect with Other Kidde/Nighthawk Alarms
The Kidde Nighthawk CO alarm is built to interconnect with other Kidde and Nighthawk smoke CO detectors, forming a single safety network. Each unit has a 2‑wire interconnect port that accepts a standard cable. When one alarm detects CO, it signals all linked devices, which then sound their horns and flash LEDs, ensuring every occupant receives an alert. To set up, power all units and attach the cable to the designated port on each alarm. The alarms automatically synchronize; testing one unit’s alarm will trigger the others, confirming the link. If a unit does not respond, verify cable connections and power supply. The interconnect feature works with Kidde’s existing smoke alarms, allowing homeowners to combine CO and smoke detection into one integrated system, simplifying installation and reducing the number of outlets needed.
Because the interconnect system uses a 2‑wire cable, it can be installed without rewiring. The alarms support a 10‑year end‑of‑life alert; when the unit reaches its service life the display flashes “EOL” and the alarm sounds, prompting replacement. This feature ensures protection now today and compliance with safety codes.
Maintenance and Support
Keep the unit clean replace the battery after 10 years and test monthly. If the alarm fails check the outlet reset or contact Kidde support Warranty covers defects for 10 years Replace batteries yearly!!!??
The Kidde Nighthawk CO alarm offers plug‑in operation, a digital display showing CO levels updated every 15 s, tamper‑resist alerts, a peak‑level button, and an end‑of‑life warning. It interconnects with Kidde/Nighthawk units for safety.
Cleaning and Sensor Care
Regular cleaning keeps the CO sensor responsive. Use a soft, dry cloth to wipe the exterior and avoid liquids. Do not spray or submerge the unit. Dust can settle inside the sensor housing; use a can of compressed air to gently blow out dust from the vent openings. Do not use a vacuum or brush that could damage the sensor diaphragm. After cleaning, re‑insert the unit into the outlet and perform a quick test by pressing the Test/Reset button. The digital display should show a stable reading before and after cleaning. If the display shows “0” or “–” after cleaning, the sensor may be compromised and should be replaced. Replace the sensor annually or after 10 years of use, whichever comes first. The Kidde Nighthawk CO alarm is designed for 10‑year life expectancy; after this period the unit will trigger an end‑of‑life alert. Follow the manufacturer’s instructions for disposal or recycling. Keep the unit away from humidity areas, and avoid placing it near fieldsor metal objects that could interfere with sensor operation. Regular maintenance extends the life of the device and ensures so reliable detection of CO. For detailed troubleshooting, consult the user manual or contact Kidde support.
Troubleshooting Common Issues
When the Kidde Nighthawk CO alarm fails to sound or displays an error, begin with the most common causes. A loose outlet connection triggers the tamper‑resist LED; unplug and re‑plug the unit, ensuring a snug fit. If the digital display shows “0” or “–”, the sensor may be exhausted or the unit is beyond its 10‑year life span; replace the alarm. A continuous alarm that does not silence after pressing the Test/Reset button indicates a CO presence or a fault; verify the CO level on the display and, if safe, reset the unit. The alarm may also sound if the unit is placed too close to a vent or a metal surface; relocate the device to a clear area. For intermittent alarms, check for dust accumulation on the sensor; clean as described in the “Cleaning and Sensor Care” section. If the alarm does not activate during a test, the internal circuitry may be damaged; contact Kidde support for repair or replacement. Finally, ensure that the unit is not powered by a battery backup that has expired; replace the battery if the alarm shows a low‑battery indicator. Follow these steps to resolve most issues quickly. If problems persist, contact Kidde customer service for assistance.
Warranty Coverage and Replacement Parts
The Kidde Nighthawk CO alarm is backed by a 10‑year limited warranty that covers manufacturing defects and sensor failure. Replacement components—such as the CO sensor, digital display, and battery backup kit—can be ordered directly from Kidde or authorized dealers. To file a claim, keep the original receipt and the unit’s serial number, located on the back panel. If the alarm fails before the 10‑year mark, Kidde will repair or replace the unit at no cost, provided it has been used per the user guide. When the unit reaches end‑of‑life, the alarm will flash red and issue a “replace soon” message; at that point the entire device must be replaced. Replacement units are sold to existing owners. The warranty does not cover damage from improper installation, tampering, or extreme temperatures. International customers receive a 12‑month warranty on replacement parts shipped overseas. Claims must be submitted within 30 days of purchase. Kidde support is reachable at 1‑800‑KIDDE‑1 or via live chat on the website. Replacement parts ship within 5–7 business days, with a tracking number provided. A free e‑manual download is available for each part to ensure correct installation and regulatory compliance. Check the serial number on Kidde’s website to confirm the warranty period!!