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  • Why is my alarm chirping and providing an amber glow?

    The alarm is in malfunction mode. You can either email or call customer support to troubleshoot directly from your Onelink app.

  • How do I silence alarms?

    If your device is alarming or if you received a push notification due to an emergency event simply press and hold the silence button on the product or press and hold the silence button within the Onelink app. If you are using the app to silence the alarm, you must be within range of the alarm to silence it.

  • Why can’t I silence my alarm?

    Once smoke or CO reaches emergency levels, the Onelink alarms cannot be silenced- by regulation in the US and Canada. You must also be within range of the alarm to silence it.

  • How many First Alert Onelink combination Smoke and Carbon Monoxide alarms can be integrated in a system?

    As with hardwired units, NFPA states that up to 18 total units can be interconnected (RF Wireless or hardwired) with a maximum of 12 of those being smoke alarms.

  • What are the benefits of having wireless interconnect?

    When one Onelink alarm goes off all wirelessly connected Onelink alarms will sound as one. The Onelink alarm will also talk to you, letting you know what type of danger (smoke or CO) and where the danger is located.

  • Does the First Alert Onelink combination Smoke and Carbon Monoxide alarm require batteries?

    The great thing about the Onelink combination Smoke and Carbon Monoxide Alarm is that it helps keep you safe for 10 years without ever having to replace batteries! This model utilizes a ten year sealed battery that ensures a decade's worth of uninterrupted awareness. The 10 year sealed lithium battery, eliminates annoying low battery chirps and costly battery replacements for the 10-year life of the alarm. The realization of a tamperproof design and the inclusion of a battery that doesn't require a replacement provides the peace of mind for longevity and security.

  • What should I do if my First Alert Onelink combination Smoke and Carbon Monoxide alarm sounds?

    If the unit alarms and you are not testing the unit, it is warning you of a potentially dangerous situation that requires your immediate attention. NEVER ignore any alarm. Ignoring the alarm may result in injury or death. Refer to the manual to identify the LED color cue.

  • When is the correct time to use the silence feature on the First Alert Onelink combination Smoke and Carbon Monoxide alarm?

    The silence feature can temporarily quiet an unwanted alarm for several minutes. This feature is intended to temporarily silence the horn while you identify and correct the problem. Do not use the Silence Feature in emergency situations. It will not correct a CO problem or extinguish a fire. Please also note that as regulated, alarm conditions that are too high cannot be silenced.

  • What is the benefit having a First Alert Onelink combination Smoke and Carbon Monoxide alarm?

    There are many benefits of having the Onelink Combination Smoke and Carbon Monoxide alarm. One reason being is the fact that it helps protect for the lifespan of 10 years against both deadly threats in one unit. This alarm has sensing technology that works actively to help better protect you and your loved ones. It also contains the wireless interconnect feature which allows you to connect each of your First Alert Onelink alarms so when one alarm sounds, they all will sound. When seconds count in an emergency it provides an audible indication of the possible threatened area and more importantly what area to investigate or to avoid. Another benefit of this product is that it contains Bluetooth and Wi-Fi connection so you can be connected to your home even if you are away.

  • How do I know the difference between the smoke alarm sounding and the carbon monoxide alarm sounding?

    Understanding your alarm is very important especially when in danger. Since this alarm features both Smoke and Carbon Monoxide detection, it is critical to know which is happening in your home. When there is a high carbon monoxide level, your alarm will beep four (4) times and will also display a red LED hue. When the alarm detects a fire in your home, the alarm will beep three (3) times and will display a red LED hue. In addition to this, when your alarms are wirelessly interconnected, the voice and location feature will tell you not only what type of emergency it is (smoke or CO) but also the location of the danger.

  • What are unsafe levels of carbon monoxide?

    Determination of unsafe levels of carbon monoxide is different for each person. Since carbon monoxide is a poison, it affects everyone at different levels. Age, size, and health are other factors that can determine the effect carbon monoxide has on them. You should contact your own physician for advice regarding the issues of safe carbon monoxide levels. Everyone is at risk at some level from carbon monoxide poisoning, but some people are more vulnerable than others. Unborn babies, infants, children, seniors, and people with heart or lung problems may be at higher risk from carbon monoxide poisoning for a variety of reasons. Be sure to install carbon monoxide detectors for protection against unsafe levels of carbon monoxide.

  • How long will the battery last in my First Alert Onelink combination Smoke and Carbon Monoxide alarm?

    The Onelink alarms are equipped with a 10 year sealed battery which will last up to 10 years – the life of the alarm. Please note that actual battery service life depends on the Smoke/CO Alarm and the environment in which it is installed. Regardless of the manufacturer’s suggested battery life, you MUST replace the Alarm immediately once the unit starts “chirping” (the “low battery warning”).

  • How many Carbon monoxide alarms should I have in my home?

    The National Fire Protection Association (NFPA) recommends that you should have a carbon monoxide alarm centrally located outside of each separate sleeping area in the immediate vicinity of the bedroom. For added protection, you should have additional carbon monoxide alarms in each separate bedroom and on every level of your house, including the basement. Some states now require that you have a carbon monoxide alarm in each bedroom of the house. If you install only one carbon monoxide alarm in your home, locate it near or in your bedroom.

  • How many smoke alarms should I have in my home?

    Minimum coverage for Smoke Alarms, as recommended by the National Fire Protection Association (NFPA), is one Smoke Alarm on every floor, in every sleeping area, and in every bedroom (See “Regulatory Information for Smoke Alarms” for details on the NFPA recommendations within the user’s manual).

  • Are First Alert Onelink combination Smoke and Carbon Monoxide alarms listed to ANSI/UL Standards?

    According to Underwriters Laboratories Inc. UL2034, Section 1-1.2: “Carbon monoxide alarms covered by these requirements are intended to respond to the presence of carbon monoxide from sources such as, but not limited to, exhaust from internal-combustion engines, abnormal operation of fuel-fired appliances, and fireplaces. CO Alarms are intended to alarm at carbon monoxide levels below those that could cause a loss of ability to react to the dangers of Carbon Monoxide exposure.” This CO Alarm monitors the air at the Alarm, and is designed to alarm before CO levels become life threatening. This allows you precious time to leave the house and correct the problem. This is only possible if Alarms are located, installed, and maintained as described in this manual.

  • What is the length of the First Alert Onelink combination Smoke and Carbon Monoxide alarm warranty?

    BRK Brands, Inc., (“BRK”) the maker of First Alert® brand products warrants that for a period of ten years from the date of purchase, this product will be free from defects in material and workmanship. Please see the “Limited Warranty” section at the back of the manual for additional information.

  • Is it a false alarm when my carbon monoxide alarm sounds and there doesn’t seem to be a problem?

    A carbon monoxide false alarm should not occur if your alarm is in working order. Remember, carbon monoxide is an odorless, colorless gas. If your carbon monoxide alarm went off, it detected potentially harmful amounts of carbon monoxide. After the professionals have evaluated the situation, make sure no one has any symptoms of carbon monoxide poisoning. Here are a few situations that may cause a carbon monoxide alarm "false alarm:" 
    • The carbon monoxide alarm needs to be relocated. Carbon monoxide alarms should be located 15-20 feet away from all fossil fuel burning sources like furnaces and stoves. Alarms should be located 10 feet away from sources of humidity like showers. 
    • Fossil fuel burning appliances may not be burning fuel completely. Check pilot lights/flames for blue color. Appearance of yellow or orange flames indicates incomplete combustion-a source of carbon monoxide.

  • What does it mean when my First Alert Onelink combination Smoke and Carbon Monoxide alarm keeps chirping?

    It is likely that the reason your smoke alarm keeps chirping and beeping is that the battery is low and your product has reached the end of its life. Fiver (5) chirps indicates the End of Life. If your product is in End of Life mode, replace the alarm immediately. If you hear three (3) chirps, this could mean the alarm is in a malfunction mode. If your alarm is in malfunction mode please contact customer support to help troubleshoot. Other reasons your alarm may be chirping are as follows:
    • A different device or appliance such as a security system, monitor, carbon monoxide alarm, or other device which has a similar low battery or alert signal.
    • Some of the same factors that cause unwanted alarms can cause intermittent alarms: dust and insects in the alarm or power interruptions in hardwired alarms. 
    • Improper wiring on AC or AC/DC smoke alarms. AC alarms will chirp every 5 seconds if the interconnect wire is grounded. The orange interconnect wire should NEVER be grounded; it should only be used to interconnect other smoke alarms or compatible devices.

  • What is the difference between Ionization smoke alarms and Photoelectric smoke alarms?

    Ionization Smoke Alarms - Generally are more effective at detecting flaming fires, which consume combustibles quickly and spread rapidly. Sources of these fires include paper burning in a wastebasket, or grease fires on a stove.
    Photoelectric Smoke Alarms - Generally are more effective at detecting smoldering fires, which smolder for hours before bursting into flame. Sources of the fires include cigarette smoldering in couches or bedding.
    For maximum protection, install both types of smoke alarms on every level of the home.

  • What type of smoke sensing technology does the First Alert Onelink combination Smoke and Carbon Monoxide alarms use?

    The Onelink smoke and carbon monoxide alarms are equipped with a photoelectric smoke sensor and an electrochemical CO sensor.

  • Where should I install my First Alert Onelink combination Smoke and Carbon Monoxide alarms?

    Minimum coverage for Smoke Alarms, as recommended by the National Fire Protection Association (NFPA), is one Smoke Alarm on every floor, in every sleeping area, and in every bedroom (See “Regulatory Information For Smoke Alarms” for details on the NFPA recommendations). For CO Alarms, the National Fire Protection Association (NFPA) recommends that a CO Alarm should be centrally located outside of each separate sleeping area in the immediate vicinity of the bedrooms. For added protection, install additional CO Alarms in each separate bedroom, and on every level of your home.

  • Can I use my Hardwire Alarm on Battery only?

    The Onelink Hardwire (AC) alarm with battery backup is designed to provide backup emergency power in the event of AC power outage and is not intended to operate the alarm for extended periods of time greater than several weeks.


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