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Hardwired Carbon Monoxide Alarm with Battery Back-up, CO5120BN

  • Hardwired Carbon Monoxide Alarm with Battery Back-up, CO5120BN
First Alert Hardwired Carbon Monoxide Alarm

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Regular Price: $66.99
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Hardwired Carbon Monoxide Alarm with Battery Back-up


This First Alert Hardwired carbon monoxide alarm with battery back-up meets codes where CO alarms are required for new construction. This carbon monoxide alarm detects dangerous CO gas and allows you peace of mind with its battery backup.



First Alert Hardwired Carbon Monoxide Alarm
CO5120BN

Hardwired Carbon Monoxide Alarm with Battery Back-up Features:

  • Quick plug-in power connector.
  • 120-volt AC inter-connectable.
  • Microprocessor controlled for fewer nuisance alarms.
  • Single test/silence button.
  • Battery drawer lock.
  • Mounting bracket lock for tamper resistance.
  • Low battery warning 'chirp'.
  • Missing battery tab.
  • Swing open battery drawer.
  • Emits T3 Pattern.
Click Here to Write a Review for this Product. Review

Average Customer Rating Based on 50 reviews: Rating: 4.8/5Rating: 4.8/5Rating: 4.8/5Rating: 4.8/5Rating: 4.8/5

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 Replacement - 01/27/2017
Reviewer: Michael Luttati
Plugged right in and worked


Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - 12/19/2016
Reviewer: Patricia Vaulding
Received quick delivery and product which we were looking for.


Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - 12/02/2016
Reviewer: Ken Huntley
IT WAS GREAT TO BE ABLE TO GET THIS ONLINE. I COULDN'T FIND IT IN ANY OF THE STORES.


Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - 11/08/2016
Reviewer: Robert Moschell
Was able to replace the non working one with no trouble at all.


Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 Fast Service - 11/01/2016
Reviewer: Charles Medchill
I had been away from home for a short time. When arriving home I could hear the CO alarm, after checking the area I determined that the unit was at fault. I ordered a new CO5120BN and an additional as a spare. The replacement arrived in less than a week allowing me to solve he problem. It was the exact unit I needed so no change of wiring was required. Thanks First Alert for the excellent service.


Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - 10/31/2016
Reviewer: Truman Onderdonk
Replaced Smoke/CO with CO only due to builders error, within 5 of stove. CO needed there for BR door. Would have been easier if base plate had been the same for all hardwired models.


Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 First Alert is First Class! - 09/20/2016
Reviewer: RawJawRic Panson
I bought 3 of these to replace the originals that were installed in my condo 17yrs ago and they are only expected to last for 10yrs.. NOW THATS RELIABILITY!!!


Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 Shipped fast works great - 07/26/2016
Reviewer: Kathleen Yung
Shipped fast product as described easy to install.


Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - 06/28/2016
Reviewer: Eileen Kraslen
Fast delivery


Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - 06/14/2016
Reviewer: Jeffery Harmon
Arrived promptly and works perfectly


Read All Reviews
Q: How do I get my carbon monoxide alarm to stop chirping?
A: If your carbon monoxide alarm keeps chirping, the battery may be low or weak. On First Alert carbon monoxide detectors, check to see if the battery light is yellow or green. If the alarm is chirping and the light is yellow, it means the battery is low. The way to get a carbon monoxide alarm to stop chirping is to replace the battery.

Q: Where should I install carbon monoxide alarms? What is proper carbon monoxide alarm placement?
A: It is very important to install carbon monoxide alarms near or in each separate sleeping area. Many states now require that a carbon monoxide alarm is placed in each bedroom. For added protection, placement of an additional carbon monoxide alarm at least 15-20 feet away from the furnace or fuel burning heat sources is recommended. Also, install carbon monoxide alarms at least 10 feet from sources of humidity like bathrooms and showers. In two story houses, install one carbon monoxide alarm on each level of the home. If you have a basement, carbon monoxide alarm placement is recommended at the top of the basement stairs.

Q: Is there anywhere I shouldn't install carbon monoxide alarms?
A: Do not install carbon monoxide alarms in garages, kitchens, furnace rooms, or in any extremely dusty, dirty, humid, or greasy areas. Do not install alarms in direct sunlight, or areas subjected to temperature extremes. These include unconditioned crawl spaces, unfinished attics, un-insulated or poorly insulated ceilings, and porches. Carbon monoxide alarms should not be installed in outlets covered by curtains or other obstructions. Do not install in turbulent air-near ceiling fans, heat vents, air conditioners, fresh air returns, or open windows. Blowing air may prevent carbon monoxide from reaching the CO sensors.

Q: How many carbon monoxide alarms should I have in my home?
A: So how many carbon monoxide alarms should you have in your 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, place it near or in your bedroom.

Q: What is the proper way to do a carbon monoxide alarm test?
A: The following procedure is the proper way to do a carbon monoxide alarm test - Press and hold the Test Button on the front of the alarm until the alarm sounds. Be sure you hold the button down long enough; it can take up to 20 seconds for the alarm to respond to the test.

Q: Is it a false alarm when my carbon monoxide alarm sounds and there doesn't seem to be a problem?
A: A carbon monoxide alarm 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.

Q: Will carbon monoxide alarms detect explosive gas leaks?
A: No, a single function carbon monoxide alarm reacts to carbon monoxide only. To detect explosive gas, you need an explosive gas detector. Different kinds of explosive gas can be detected and it is recommended that any home that utilizes natural or propane gas have at least one explosive gas leak detector.


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