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Kidde Smoke and Carbon Monoxide Alarm User Manual

Kidde Smoke and Carbon Monoxide Alarm Featured


Kidde Smoke and Carbon Monoxide Alarm

Kidde Smoke and Carbon Monoxide Alarm Product

About Kidde

Walter Kidde established the Walter Kidde Company in 1917, which created the first shipboard-integrated smoke detection and carbon dioxide extinguishing system. This creation was just one of many firsts that would contribute to a safer world and establish a century-long tradition of industry leadership.

Kidde products can now be found in residences and establishments all over the world. By warning people of threats sooner, our smoke and carbon monoxide detectors help avoid injuries and reduce damage. People are equipped to halt the spread of fires before they cause catastrophes thanks to our extensive selection of fire extinguishers.


  • Nuisance alarm reduction
  • 2 AA Battery Powered
  • 2-LED Display
  • Peak Level Memory
  • Test/Hush® button
  • Voice Message System

For questions concerning your Smoke and Carbon Monoxide Alarm, please call our Product Support Line at 1-800-880-6788.



Thank you for purchasing the Kidde Combination Smoke and Carbon Monoxide Alarm model # KN-COSMXTR-BA. This alarm is suitable as a Single Station. This alarm has a ten-year limited warranty. Please take a few minutes to thoroughly read this user guide, and save it for future reference. Teach children how to respond to the alarms, and that they should never play with the unit. Your Kidde Smoke/CO Alarm was designed to detect both smoke and carbon monoxide from any source of combustion in a residential environment. It is not designed for use in a recreational vehicle (RV) or boat. If you have any questions about the operation or installation of your alarm, please call our toll-free Product Support Line at 1-800-880-6788. The guide on Page 24 will help you determine the correct location of safety products that will help keep your home a safer place.

Product View


Kidde Smoke and Carbon Monoxide Alarm (1)


Kidde Smoke and Carbon Monoxide Alarm (2)


  • Nuisance alarm reduction
  • Loud 85 decibel alarm.
  • Permanent independent smoke and carbon monoxide sensors.
  • Smoke alarm takes precedence when both smoke and carbon monoxide are present.
  • Powered by two AA batteries.
  • Alarm/Voice message warning system that alerts you of the following conditions in the manner described below, thus eliminating any confusion over which alarm is sounding:
  • FIRE: The alarm/voice pattern is three long alarm beeps followed by the verbal warning message “FIRE!” This pattern is repeated until the smoke is eliminated. The red LED light will flash while in alarm/voice mode.
  • CARBON MONOXIDE: The alarm/voice pattern is four short alarm beeps followed by the verbal warning message “WARNING! CARBON MONOXIDE!”. This continues until the unit is reset or the CO is eliminated after four minutes the alarm/voice pattern will sound once every minute. The red Light Emitting Diode (LED) light will flash while in alarm/voice mode.
  • LOW BATTERY: When the batteries are low and need replacing the red LED light will flash and the unit will “chirp” once every 60 seconds for at least 7 days. The “LOW BATTERY” voice only occurs once every 15 minutes.
  • Voice Message System that alerts the user to the following conditions:
    • Only for the smoke alarm Hush System announces “HUSH MODE ACTIVATED” when the unit is first put into HUSH Mode.
    • Only for the smoke alarm Hush System announces “HUSH MODE CANCELLED” when the unit resumes normal operation after Hush Mode has been canceled.
    • Only if the button is pushed System announces “CAUTION, CARBON MONOXIDE PREVIOUSLY DETECTED” when the unit has detected CO concentrations of 100 ppm or higher.
    • The system announces “PUSH TEST BUTTON” when the unit is powered up, reminding the user to activate the Test Button.
  • End of Life Hush. At the end of product life, the button can be pushed to silence the end-of-life “chirp” for approximately 3 days at a time, for a maximum of 30 days life extension.
  • One “chirp” every 30 seconds is an indication that the alarm is malfunctioning. If this occurs call the Product Support Line at 1-800-880-6788.
  • The test/Reset button performs functions. (See page 14).
  • HUSH Control Feature that silences the unit during nuisance alarm situations (see page 15).
  • Peak Level Memory Feature which alerts the user when the unit has detected CO concentrations of 100 ppm or greater (see page 16).
  • Alarm Memory Feature that gives visual indication when an alarm has sensed a hazardous condition.
  • Green and red LED lights that indicate normal operation and alarm status (pages 16 and 17 for details).
  • Tamper Resist Feature that deters children and others from removing the alarm (see page 17).
  • Battery reminder flag that prohibits installation when batteries are not present.

Features and General Information

  • The use of alcohol or drugs may also impair one’s ability to hear the smoke alarm. For maximum protection, a smoke alarm should be installed in each sleeping area on every level of a home.
  • Although smoke alarms can help save lives by providing an early warning of a fire, they are not a substitute for an insurance policy. Homeowners and renters should have adequate insurance to protect their lives and property

Carbon Monoxide (CO) Alarm

The Carbon Monoxide (CO) alarm monitors the air for the presence of CO. It will alarm when there are high levels of CO present, and when there are low levels of CO present over a longer period of time (see page 21 for alarm times). When a CO condition matches either of these situations, the alarm/voice message warning system will sound, and be accompanied by the flashing red LED light. The carbon monoxide sensor uses an electrochemical technology.

CAUTION: This alarm will only indicate the presence of carbon monoxide gas at the sensor. Carbon monoxide gas may be present in other areas.

Individuals with medical problems may consider using warning devices that provide audible and visual signals for carbon monoxide concentrations under 30 ppm.

Installation Instructions

Step 1

Installation Guide:


Recommended Installation Locations:

Kidde Safety recommends the installation of a Smoke/CO Alarm in the following locations. For maximum protection, we suggest an alarm be installed on each level of a multilevel home, including every bedroom, hallway, finished attics, and basement. Put alarms at both ends of the bedroom, hallway, or large room if the hallway or room is more than 30 ft (9.1m) long. If you have only one alarm, ensure it is placed in the hallway outside of the main sleeping area, or in the main bedroom. Verify the alarm can be heard in all sleeping areas.

Locate an alarm in every room where someone sleeps with the door closed. The closed door may prevent an alarm not located in that room from waking the sleeper. Smoke, heat, and combustion products rise to the ceiling and spread horizontally. Mounting the alarm on the ceiling in the center of the room places it closest to all points in the room. Ceiling mounting is preferred in ordinary residential construction. When mounting an alarm on the ceiling, locate it at a minimum of 4” (10cm) from the side wall (see figure 1). If installing the alarm on the wall, use an inside wall with the top edge of the alarm at a minimum of 4” (10cm) and a maximum of 12” (30.5cm) below the ceiling (see figure 1).

Kidde Smoke and Carbon Monoxide Alarm (3)

Sloped Ceiling Installation:

The following information is from the National Fire Protection Association and is listed in Fire Code 72.

Install Smoke Alarms on sloped, peaked, or cathedral ceilings at, or within 3 ft (0.9m) of the highest point (measured horizontally). NFPA 72 states “Smoke alarms in rooms with ceiling slopes greater than 1 ft to 8 ft (.3 m-2.4 m) horizontally shall be located on the high side of the room”.

NFPA 72 states “A row of alarms shall be spaced and located within 3 ft (0.9 m) of the peak of the ceiling measured horizontally” (see Figure 2).

Kidde Smoke and Carbon Monoxide Alarm (4)

Mobile Homes:

Modern mobile homes have been designed and built to be energy efficient. Install Smoke/CO alarms as recommended above (refer to Recommended Installation Instructions and Figure 1). In older mobile homes that are not well insulated, extreme heat or cold can be transferred from the outside to the inside through poorly insulated walls and roofs. This may cause a thermal barrier, which can prevent smoke from reaching an alarm mounted on the ceiling. In such mobile homes install your Smoke/CO Alarm on an inside wall with the top edge of the alarm at a minimum of 4 inches (10cm) and a maximum of 12 inches (30.5cm) below the ceiling (see Figure 2). If you are not sure about the insulation in your mobile home, or if you notice that the outer walls and ceiling are either hot or cold, install your alarm on an inside wall ONLY!


WARNING – This product is intended for use in ordinary indoor locations of family living units. It is not designed to measure compliance with Occupational Safety and Health Administration (OSHA) commercial or industrial standards.

Where Not to Install:

Do not install in garages, kitchens, furnace rooms or bathrooms! INSTALL AT LEAST 5 FEET AWAY FROM ANY FUEL-BURNING APPLIANCE.

Do not install within 3 ft (.9m) of the following: The door to a kitchen, or a bathroom that contains a tub or shower, forced air supply ducts used for heating or cooling, ceiling or whole house ventilating fans, or other high air areas. Avoid excessively dusty, dirty, or greasy areas. Dust, grease, or household chemicals can contaminate the alarm’s sensors, causing it to not operate properly.

Place the alarm where drapes or other objects will not block the sensor. Smoke and CO must be able to reach the sensors to accurately detect these conditions. Do not install in peaks of vaulted ceilings, “A” frame ceilings, or gabled roofs. Keep out of damp and humid areas.

Install at least one (1) foot away from fluorescent lights, electronic noise may cause nuisance alarms. Do not place in direct sunlight and keep out of insect-infested areas. Extreme temperatures will affect the sensitivity of the Smoke/CO Alarm. Do not install in areas where the temperature is colder than 40 degrees Fahrenheit (4.4˚ Celsius) or hotter than 100 degrees Fahrenheit (37.8˚ Celsius), such as garages and unfinished attics. Do not install in areas where the relative humidity (RH) is above 95%, non-condensing. Place away from doors and windows that open to the outside.

Step 2

Mounting Instructions


  1. To help identify the date to replace the unit, write the “Replace by” date (10 years from the initial power-up) in a permanent marker in the space provided on the side of the alarm. See the Alarm Replacement section for additional information.
  2. Remove the mounting bracket from the back of the alarm by holding the mounting bracket and twisting the alarm in the direction indicated by the “OFF” arrow on the alarm cover.
  3. Selecting the proper location for your Smoke/CO Alarm, as described on Pages 8-11. To ensure aesthetic alignment of the alarm with the hallway, or wall, the “A” line on the mounting bracket must be parallel with the hallway when ceiling mounted, or horizontal when wall mounted.
  4. Install the alarm on the mounting bracket and rotate the alarm in the direction of the “ON” arrow on the cover until the alarm ratchets into place (this ratcheting function allows for aesthetic alignment). Note: The alarm will mount to the bracket in 4 positions (every 90 degrees).
  5. Two labels are included with your alarm. They have important information on what to do in case of an alarm. Add the phone number of your emergency service provider (Fire Department or 911) in the space provided. Place one label next to the alarm after it is mounted, and one label near a fresh air source such as a door or window.
  6. Remove the red cardboard from the battery compartment, install batteries, and close the battery door.

Step 3

Testing the Alarm

CAUTION: Due to the loudness (85 decibels) of the alarm, always stand arm’s length away from the unit when testing.

After installation, TEST THE UNIT’S ELECTRONICS by pressing and releasing the test/reset button.

You will then hear the following sequence of “beeps” and verbal warnings:

  • Three long beeps.
  • Verbal warning: “FIRE!”
  • Three long beeps.
  • Four quick beeps.


Four quick beeps

Weekly testing is required! If at any time it does not perform as described, verify power is connected correctly and that the battery doesn’t need replacing. Clean dust and other buildup off the unit. If it still doesn’t operate properly call the Product Support Line at 1-800-880-6788.

Operating Instructions

Smoke HUSH Control Feature

The HUSH feature has the capability of temporarily desensitizing the smoke alarm circuit for approximately 9 minutes. This feature is to be used only when a known alarm condition, such as smoke from cooking, activates the alarm. You can put your Smoke/CO Alarm in HUSH mode by pushing the test/reset button. If the smoke is not too dense, the alarm will silence immediately, the unit will verbally announce “HUSH MODE ACTIVATED”, and the green LED will flash every 2 seconds for approximately 9 minutes. This indicates that the smoke alarm is in a temporarily desensitized condition. Your Smoke/CO Alarm will automatically reset after approximately 9 minutes. When the unit returns to normal operation after being in HUSH mode, it will verbally announce “HUSH MODE CANCELLED”, and sound the alarm if smoke is still present. The HUSH feature can be used repeatedly until the air has been cleared of the condition causing the alarm. While the unit is in HUSH mode, pushing the test/reset button on the alarm will also end the HUSH period.



Reset Feature

If the Smoke/CO Alarm is sounding a CO alarm, pressing the test/reset button will silence the alarm.

If the CO condition that caused the alert continues, the alarm will reactivate within 200 seconds.(see page 21).

CO Peak Level Memory

If the green LED is blinking once every 10 seconds, the unit has detected a hazardous CO condition. If the CO sensor has detected a CO level of 100 PPM or higher since the last reset, it will be recorded by the Peak Level Memory function. To access the Peak Level Memory press the test/reset button. If a reading of 100 PPM or higher has been recorded, the unit will announce “Caution, Carbon Monoxide Previously Detected.” If you’ve been away from home this feature allows you to check if there was a CO reading of 100, or higher, during your absence. Pushing the test/reset button resets the memory. It’s also reset when the battery is removed.

LED Indicator Operation


The red LED will flash as described below under the following conditions:

  • During smoke or CO alarm, with every beep
  • During testing (same as an alarm)
  • Low battery, single flash with chirp
  • End of product life, double flash every 30 seconds with chirp
  • Unit error mode, single flash with chirp every 30 seconds
  • In unit error mode, a Fault Code is flashed every 30 seconds (can be observed and reported to customer service for troubleshooting).

Green LED

The green LED will flash as described below under the following conditions:

  • Standby Condition: The LED will flash every 60 seconds.
  • Alarm Memory Condition: The LED will flash every second during an alarm. When the alarm condition goes away, the originating alarm unit will flash the LED every 16 seconds until the test/reset button is pressed, thus resetting the alarm.
  • HUSH MODE Condition: The LED will flash every 2 seconds while the alarm is in HUSH mode.

Tamper Resist Feature

To make your smoke/CO alarm tamper resistant, a tamper resist feature has been provided. Activate the tamper resist feature by breaking off the four posts in the square holes in the trim ring (see Figure 5A). When the posts are broken off, the tamper resist tab on the base is allowed to engage the mounting bracket. Rotate the alarm onto the mounting bracket until you hear the tamper-resist tab snap into place, locking the alarm on the mounting bracket. Using the tamper resist feature will help deter children and others from removing the alarm from the bracket. NOTE: To remove the alarm when the tamper resist tab is engaged, press down on the tamper resist tab, and rotate the alarm off of the bracket (see Figure 5B).

Kidde Smoke and Carbon Monoxide Alarm (5)


Determining what type of alarm has sounded is easy with your Combination Smoke/CO Alarm. The voice message warning system will inform you of the type of situation occurring. Refer to the Features section on pages 4-7 for a detailed description of each alarm pattern.

What To Do If The Alarm Sounds

When the smoke alarm sounds:

Smoke alarms are designed to minimize false alarms. Cigarette smoke will not normally set off the alarm unless the smoke is blown directly into the alarm. Combustion particles from cooking may set off the alarm if located too close to the cooking area. Large quantities of combustible particles are generated from spills or when broiling. Using the fan on a range hood that vents to the outside (nonrecirculating type) will also help remove these combustible products from the kitchen.

If the alarm sounds, check for fires first. If a fire is discovered follow these steps. Become thoroughly familiar with these items, and review them with all family members!

  • Alert small children in the home.
  • Leave immediately using one of your planned escape routes (see page 26). Every second counts, don’t stop to get dressed or pick up valuables.
  • Before opening inside doors look for smoke seeping in around the edges, and feel with the back of your hand. If the door is hot use your second exit. If you feel it’s safe, open the door very slowly and be prepared to close immediately if smoke and heat rush in.
  • If the escape route requires you to go through smoke, crawl low under the smoke where the air is clearer.
  • Go to your predetermined meeting place. When two people have arrived one should leave to call 911 from a neighbor’s home, and the other should stay to perform a head count.
  • Do not reenter under any circumstance until fire officials give the go-ahead.
  • There are situations where a smoke alarm may not be effective to protect against fire as stated in the NFPA Standard 72. For instance:
    • smoking in bed
    • leaving children unsupervised
    • cleaning with flammable liquids, such as gasoline

The CO sensor meets the alarm response time requirements of UL standard 2034.

Standard alarm times are as follows:

  • At 70 PPM, the unit must alarm within 60-240 minutes.
  • At 150 PPM, the unit must alarm within 10-50 minutes.
  • At 400 PPM, the unit must alarm within 4-15 minutes.

This carbon monoxide alarm is designed to detect carbon monoxide gas from ANY source of combustion. It is NOT designed to detect any other gas.

Fire Departments, most utility companies, and HVAC contractors will perform CO inspections, some may charge for this service. It’s advisable to inquire about any applicable fees prior to having the service performed. Kidde Safety will not pay for, or reimburse, the owner or user of this product, for any repair or dispatch calls related to the alarm sounding.

When the carbon monoxide alarm sounds:

WARNING – The actuation of your CO Alarm indicates the presence of Carbon! Monoxide (CO) can kill you.

If the alarm signal sounds:

  1. Operate the test/reset button
  2. Call your emergency services (Fire Dept. or 911)
  3. Immediately move to fresh air – outdoors or by an open door/window. Do a head count to check that all persons are accounted for. Do not reenter the premises nor move away from the open door/window until the emergency services responders have arrived, the premises have been aired out, and your alarm remains in its normal condition.
  4. After following steps 1-3, if your alarm reactivates within a 24-hour period, repeat steps 1-3 and call a qualified appliance technician to investigate for sources of CO from fuel-burning equipment and appliances, and inspect for proper operation of this equipment. If problems are identified during this inspection have the equipment serviced immediately. Note any combustion equipment not inspected by the technician and consult the manufacturer’s instructions, or contact the manufacturer directly, for more information about CO safety and this equipment. Make sure that motor vehicles are not, and have not been, operating in an attached garage or adjacent to the residence.

Never restart the source of a CO problem until it has been fixed. NEVER IGNORE THE ALARM!

Battery Replacement

Alarm Removal


Remove the alarm from the mounting bracket by rotating the alarm in the direction of the “OFF” arrow on the cover.

Battery Replacement

If any form of battery failure is detected the red LED light will flash and the unit will “chirp” once every 60 seconds for at least 7 days. The “LOW BATTERY” voice occurs once every 15 minutes. The green LED will also be flashing twice per second.

If the red LED light flashes along with a chirp every 30 seconds, and is not followed by the voice message “LOW BATTERY” as described above, your unit has malfunctioned.

Call our toll-free Product Support Line at 1-800-880-6788 for instructions on how to return the unit.


To replace or install the batteries slide the battery door in the direction indicated on the cover of the alarm. When installing new batteries into the carrier, make sure that the polarity matches the markings printed on the inside of the battery compartment, press the battery reminder finger down into the battery compartment, and install the battery (see Figure 6). Completely slide the battery door to the closed position. A missing or improperly installed battery will prevent the battery door from closing and result in improper alarm operation.

Kidde Smoke and Carbon Monoxide Alarm (6)

Replace batteries with one of the following approved brands: Energizer E91, Gold Peak 15A, or Golden Power GLR6A. These batteries can be purchased at your local retailer.

WARNING! Use only the batteries specified. The use of different batteries may have a detrimental effect on the Smoke/CO alarm. A good safety measure is to replace the batteries twice a year, at the same time. A good safety measure is to replace the batteries twice a year, at the same time you change your clocks for daylight saving time.

End-of-Life Notification

Ten (10) years after the unit is first powered, this alarm will beep two times every 30 seconds to indicate it is time to replace the alarm.


End of Life Hush can be activated by pushing the test button to silence the End of Life chirp for approximately 3 days at a time for a maximum of 30-day life extensions.

General Maintenance

To keep your Smoke/CO Alarm in good working order, please follow these simple steps:

  • Verify the unit’s alarm and LED lights operation by pushing the test/reset button once a week.
  • Remove the unit from the mounting bracket and vacuum the alarm cover and vents with a soft brush attachment once a month to remove dust and dirt. REINSTALL IMMEDIATELY AFTER CLEANING AND THEN TEST USING THE TEST/RESET BUTTON!
  • Never use detergents or other solvents to clean the unit.
  • Avoid spraying air fresheners, hair spray, or other aerosols near the Smoke/CO Alarm.

Do not paint the unit. Paint will seal the vents and interfere with the sensor’s ability to detect smoke and CO. Never attempt to disassemble the unit or clean inside. This action will void your warranty.

Move the Smoke/CO Alarm and place it in another location prior to performing any of the following:

  • Staining or stripping wood floors or furniture
  • Painting
  • Wallpapering
  • Using adhesives

Storing the unit in a plastic bag during any of the above projects will protect the sensors from damage. Do not place it near a diaper pail.

WARNING: Reinstall the Smoke/CO Alarm as soon as possible to assure continuous protection.

When household cleaning supplies or similar contaminates are used, the area must be well-ventilated. The following substances can affect the CO sensor and may cause false readings and damage to the sensor:

Methane, propane, iso-butane, isopropanol, ethyl acetate, hydrogen sulfide, sulfide dioxides, alcohol-based products, paints, thinner, solvents, adhesives, hair spray, aftershave, perfume, and some cleaning agents.

Carbon Monoxide Safety Information

General CO Information

Carbon monoxide (CO) is a colorless, odorless, and tasteless poison gas that can be fatal when inhaled. CO inhibits the blood’s capacity to carry oxygen.

Possible Sources

CO can be produced when burning any fossil fuel: gasoline, propane, natural gas, oil, and wood. It can be produced by any fuel-burning appliance that is malfunctioning, improperly installed, or not ventilated correctly. Possible sources include furnaces, gas ranges/stoves, gas clothes dryers, water heaters, portable fuel-burning space heaters, fireplaces, wood-burning stoves, and certain swimming pool heaters. Blocked chimneys or flues, back drafting and changes in air pressure, corroded or disconnected vent pipes, and a loose or cracked furnace exchanger can also cause CO. Vehicles and other combustion engines running in an attached garage and using a charcoal/gas grill or hibachi in an enclosed area are all possible sources of CO.

The following conditions can result in transient CO situations: Excessive spillage or reverse venting of fuel-burning appliances caused by outdoor ambient conditions such as Wind direction and/or velocity, including high gusts of wind, heavy air in the vent pipes (cold/humid air with extended periods between cycles), negative pressure differential resulting from the use of exhaust fans, simultaneous operation of several fuel-burning appliances competing for limited internal air, vent pipe connections vibrating loose from clothes dryers, furnaces, or water heaters, obstructions in, or unconventional, vent pipe designs which can amplify the above situations, extended operation of unvented fuel-burning devices (range, oven, fireplace, etc.), temperature inversions which can trap exhaust gasses near the ground, car idling in an open or closed attached garage, or near a home.

CO Safety Tips

Every year the heating system, vents, chimney, and flue are inspected and cleaned by a qualified technician. Always install appliances according to the manufacturer’s instructions and adhere to local building codes. Most appliances should be installed by professionals and inspected after installation. Regularly examine vents and chimneys for improper connections, visible rust, or stains, and check for cracks in furnace heat exchangers. Verify the color of the flame on pilot lights and burners is blue. A yellow or orange flame is a sign that the fuel is not burning completely. Teach all household members what the alarm sounds like and how to respond.

Symptoms of CO Poisoning

Initial carbon monoxide poisoning symptoms are similar to the flu with no fever and can include dizziness, severe headaches, nausea, vomiting and disorientation. Everyone is susceptible but experts agree that unborn babies, pregnant women, senior citizens, and people with heart or respiratory problems are especially vulnerable. If symptoms of carbon monoxide poisoning are experienced seek medical attention immediately. CO poisoning can be determined by a carboxyhemoglobin test.

The following symptoms are related to CARBON MONOXIDE POISONING and should be discussed with ALL members of the household:

  1. Mild Exposure: Slight headache, nausea, vomiting, fatigue (often described as “Flu-like” symptoms).
  2. Medium Exposure: Severe throbbing headache, drowsiness, confusion, and fast heart rate.
  3. Extreme Exposure: Unconsciousness, convulsions, cardiorespiratory failure, death.

The above levels of exposure relate to healthy adults. Levels differ for those at high risk. Exposure to high levels of carbon monoxide can be fatal or cause permanent damage and disabilities. Many cases of reported carbon monoxide poisoning indicate that while victims are aware they are not well, they become so disoriented they are unable to save themselves by either exiting the building or calling for assistance. Also, young children and household pets may be the first affected. Familiarization with the effects of each level is important.

Fire Safety Information

Escape Plan

Familiarize everyone with the sound of the smoke alarm and train them to leave the home when they hear it. Practice a fire drill at least every six months, including fire drills at night. Ensure that small children hear the alarm and wake when it sounds. They must wake up in order to execute the escape plan. Practice allows all occupants to test your plan before an emergency. You may not be able to reach your children. It is important they know what to do. Know two ways out of every room (door & window) and identify a meeting place outside the home where everyone will gather once they have exited the residence. When two people have reached the meeting place, one should leave to call 911 while the second person stays to account for additional family members.

Establish a rule that once you’re out, you never reenter under any circumstance!

Current studies have shown smoke alarms may not awaken all sleeping individuals, and that it is the responsibility of individuals in the household that are capable of assisting others to provide assistance to those who may not be awakened by the alarm sound, or to those who may be incapable of safely evacuating the area unassisted.

Fire Prevention

Never smoke in bed, or leave cooking food unattended. Teach children never to play with matches or lighters!

Train everyone in the home to recognize the alarm pattern, voice message warning and to leave the home using their escape plan when it’s heard.

Know how to do “Stop, Drop and Roll” if clothes catch on fire, and how to crawl low under smoke. Install and maintain fire extinguishers on every level of the home and in the kitchen, basement, and garage. Know how to use a fire extinguisher prior to an emergency. Second-level and higher-occupied rooms with windows should have an escape ladder.

Industry Safety Standards

NFPA (National Fire Protection Association)

Kidde Smoke and Carbon Monoxide Alarm (7)

For your information, the National Fire Protection Association’s Standard 72, reads as follows:

Smoke Detection. Where required by other governing laws, codes, or standards for a specific type of occupancy, approved single and multiple-station smoke alarms shall be installed as follows:

  1. In all sleeping rooms and guest rooms
  2. Outside of each separate dwelling unit sleeping area, within 21 ft (6.4 m) of any door to a sleeping room, with the distance measured along a path of travel
  3. On every level of a dwelling unit, including basements
  4. On every level of a residential board and care occupancy (small facility), including basements and excluding crawl spaces and unfinished attics
  5. In the living area(s) of a guest suite
  6. In the living area(s) of a residential board and care occupancy (small facility)

Smoke Detection – Are More Smoke Alarms Desirable? The required number of smoke alarms might not provide reliable early warning protection for those areas separated by a door from the areas protected by the required smoke alarms. For this reason, it is recommended that the householder consider the use of additional smoke alarms for those areas for increased protection. The additional areas include the basement, bedrooms, dining room, furnace room, utility room, and hallways not protected by the required smoke alarms. The installation of smoke alarms in kitchens, attics (finished or unfinished), or garages is not normally recommended, as these locations occasionally experience conditions that can result in improper operation.

Carbon Monoxide Safety Information

California State Fire Marshall

Early warning fire detection is best achieved by the installation of fire detection equipment in all rooms and areas of the household as follows: A smoke alarm installed in each separate sleeping area (in the vicinity, but outside the bedrooms), heat or smoke detectors in the living rooms, dining rooms, bedrooms, kitchens, hallways, attics, furnace rooms, closets, utility and storage rooms, basements and attached garages.

Consumer Product Safety Commission

The Consumer Product Safety Commission (CPSC) recommends the use of at least one CO Alarm per household, located near the sleeping area.


Ionization-type smoke alarms use a very small amount of a radioactive element in the sensing chamber to enable the detection of visible and invisible combustion products. The radioactive element is safely contained in the chamber and requires no adjustments or maintenance. This smoke alarm meets or exceeds all government standards. It is manufactured and distributed under license from the U.S. Nuclear Regulatory Commission.


This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

  • Reorient or relocate the receiving antenna.
  • Increase the separation between the equipment and the receiver.
  • Connect the equipment to an outlet on a circuit different from that to which the receiver is connected.
  • Consult the dealer or an experienced radio/TV technician for help

Limited Warranty


KIDDE warrants that the enclosed alarm (but not the battery) will be free from defects in material and workmanship or design under normal use and service for a period of ten years from the date of purchase. The obligation of KIDDE under this warranty is limited to repairing or replacing the alarm or any part which we find to be defective in material, workmanship, or design, free of charge, upon sending the alarm with proof of date of purchase, postage, and return postage prepaid, to Warranty Service Department, KIDDE, 1016 Corporate Park Dr., Mebane, NC 27302.

This warranty shall not apply to the alarm if it has been damaged, modified, abused, or altered after the date of purchase or if it fails to operate due to improper maintenance or inadequate DC power. Any implied warranties arising out of this sale, including but not limited to the implied warranties of description, merchantability, and fitness for a particular purpose, are limited in duration to the above warranty period. In no event shall the Manufacturer be liable for loss of use of this product or for any indirect, special, incidental, or consequential damages, costs, or expenses incurred by the consumer or any other user of this product, whether due to a breach of contract, negligence, strict liability in tort or otherwise. The Manufacturer shall have no liability for any personal injury, property damage, or any special, incidental, contingent, or consequential damage of any kind resulting from gas leakage, fire, or explosion.

Since some states do not allow limitations of the duration of an implied warranty or do not allow the exclusion or limitation of incidental or consequential damages, the above limitations or exclusions may not apply to you. While this warranty gives you specific legal rights, you may also have other rights which vary from state to state.

Also, KIDDE makes no warranty, express or implied, written or oral, including that of merchantability or fitness for any particular purpose, with respect to the battery.

The above warranty may not be altered except in writing signed by both parties hereto.

Fire Safety Information

Your Kidde Combination Smoke & CO Alarm is not a substitute for property, fire, disability, life, or other insurance of any kind. Appropriate insurance coverage is your responsibility. Consult your insurance agent.

Removal of the front cover will void the warranty

This alarm is not intended to alert hearing-impaired individuals.

During the specified warranty period Kidde Products will repair or replace, at its discretion any defective Kidde Combination Smoke & CO Alarms that are returned in a postage-paid package to the following address: Kidde Products Attn: Warranty Returns, 1016 Corporate Park Dr., Mebane, NC 27302, USA. Please include your name, address, and phone number along with a brief description of what is wrong with the unit. For further assistance please call our toll-free Product Support Line at 1-800-880-6788. Damage from neglect, abuse, or failure to adhere to any of the enclosed instructions will result in termination of the warranty, and the unit will not be replaced or repaired.

This manual and the products described herein are copyrighted, with all rights reserved. Under these copyright laws, no part of this manual may be copied for use without the written consent of Kidde. If you require further information please contact our Product Support Line at 1-800-880-6788 or write us at Kidde Products, 1016 Corporate Park Dr., Mebane, NC 27302.

FAQs Kidde Smoke and Carbon Monoxide Alarm

What is a Kidde smoke and carbon monoxide alarm, and how does it work?

A Kidde smoke and carbon monoxide alarm is a safety device designed to detect the presence of smoke from a fire and the presence of carbon monoxide gas in indoor spaces. The alarm uses sensors to detect these hazardous elements and triggers a loud audible alarm to alert occupants of potential dangers.

How do I install a Kidde smoke and carbon monoxide alarm?

Kidde smoke and carbon monoxide alarms are typically designed for easy installation. Most models can be mounted on the ceiling or wall using screws or adhesive pads provided in the packaging. It’s essential to follow the installation instructions provided in the user manual to ensure proper placement and functionality.

What should I do if my Kidde alarm sounds?

If your Kidde smoke and carbon monoxide alarm sound an alert, treat it seriously. In the event of a smoke alarm activation, check for signs of smoke or fire and follow your fire escape plan to evacuate the building if necessary. If the carbon monoxide alarm activates, leave the area and seek fresh air immediately. Call emergency services if you suspect a real emergency.

How often should I replace the batteries in my Kidde alarm?

Kidde recommends testing the alarms weekly and replacing the batteries at least once a year, or as soon as you hear a low battery warning (usually a chirping sound). Some Kidde models come with sealed-in, non-replaceable batteries that last for the lifespan of the alarm.

What is the lifespan of a Kidde smoke and carbon monoxide alarm?

The lifespan of Kidde smoke and carbon monoxide alarms can vary depending on the model. Some models have a recommended lifespan of 10 years, after which the entire unit needs replacement. Check the user manual or the label on the alarm for the recommended lifespan.

Can I interconnect multiple Kidde alarms in my home?

Yes, many Kidde models are designed to be interconnected, allowing multiple alarms to communicate with each other. When one alarm detects smoke or carbon monoxide, all interconnected alarms will sound, providing enhanced safety and early warning throughout your home.

Are Kidde alarms compatible with smart home systems?

Some Kidde models may be compatible with smart home systems and have additional features, such as smartphone alerts, voice alerts, and remote monitoring. If smart home compatibility is essential to you, check the product specifications before purchasing.

How do I test my Kidde smoke and carbon monoxide alarm?

To test your Kidde alarm, locate the “Test” button on the unit. Press and hold the button for a few seconds until you hear the alarm sound. If the alarm doesn’t sound during the test, check the battery or power source, and ensure the alarm is correctly installed.

Can I silence a Kidde alarm temporarily if it goes off due to cooking smoke or steam?

Yes, Kidde smoke and carbon monoxide alarms often come with a “Hush” or “Silence” feature. If the alarm is triggered by cooking smoke or steam, pressing the “Hush” button will silence the alarm for a short duration without disabling it completely. However, if the alarm is triggered by a genuine emergency, it will continue to sound.

What should I do if my Kidde carbon monoxide alarm goes off?

If your Kidde carbon monoxide alarm activates, it indicates the presence of carbon monoxide gas. Immediately leave the area and move to a well-ventilated space with fresh air. Call emergency services and do not return to the affected area until it has been deemed safe by professionals.

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