Customer Reviews For The First Alert Basic Battery Operated Carbon Monoxide Alarm - CO400

Overall Rating

172 Reviews
168 customers recommend this product
Rick F
November 7, 2022
Verified Purchase

Order process was simple and product arrived as scheduled. Installed the included battery, tested then mounted on wall where the old one was. Now I can only hope it works when necessary....fingers crossed that time never comes!! The previous one was replaced as a result of the end-of-life alarm feature. It was already in use when I moved into the house Nov 2016. I would reccommend.

Betty H
October 10, 2022
Verified Purchase
Carbon Monoxide Alarm purchase

Our carbon monoxide alerted us that it was at end of life. We quickly replaced it thru First Alert. We have been fortunate to never need the alarm but we know of friends who are still alive because their First Alert woke them up. The order process was so easy and efficient.

Manuel C
September 8, 2022
Verified Purchase
easy install

Ordered exact same model to replace. Easy to install with existing mounting screws.

William A
September 5, 2022
Verified Purchase
Thanks First Alert

Ordered product to replace expiring unit. Came very quickly, with an included battery and placed in previous position to protect the home. Great service.

Darlene S
November 8, 2021
Verified Purchase
First Alert Alarm

Replaced the original with the same type. Fast shipping and easy set up. Will replace with same when needed. Love it!

September 29, 2021
Verified Purchase

As promised, order arrived quickly, in mint condition. and with clear instructions as to how to set up and use it. The alarm worked perfectly the first time, and I have no doubt it will last as long as the one it replaced.

George N
May 17, 2021
Verified Purchase
Couldn't Have Been Easier

I recently had to replace my First Alert CO detector. I decided to buy the same Model#. When did a Google search for that item, I was pleasantly surprised to find that the First Alert direct price was the lowest, and shipping was free. The whole ordering process was very easy, and I received the item quickly.

Tom Rubenstein
March 2, 2021
Verified Purchase
Basic Battery Operated Co2 Alarm-CO400

Ordered product directly for First Alert website...easy to navigate and simple order process. Received product within 3 days. Directions for install were thorough and straightforward.

James D Stewart
January 25, 2021
Verified Purchase
Fast and easy

I have ordered from this site before. It is easy to order and delivery is fast. Product arrived and is as described on the web site. Good product.

Lisa Andrade
December 17, 2020
Verified Purchase
Fast Service!

Very easy to order and fast service!

Karen Eskew
December 1, 2020
Verified Purchase

Always use first alert products. Very trustworthy and safe.

Steve K
November 30, 2020
Verified Purchase

Works fine and easy to install

Philip Davis
October 10, 2020
Verified Purchase
Three pack

Fast delivery, packaged well, exactly as expected.

Bernard Dube
August 4, 2020
Verified Purchase

My order came in and seems to be operating well. Thank you

Allan Griff
July 20, 2020
Verified Purchase

Nothing wrong with device, but was disappointed to find bolt holes not same distance be so I had to put in a new wallbolt. B

Elisa Goodwin
July 6, 2020
Verified Purchase
Works as expected!

Received the item on time and it works as expected. Happy with my purchase thus far. One item to note: the placement of the screw holes in this model has changed in recent years, so while I was trying to avoid having to drill new holes by purchasing the same model as I was replacing, I did have to accommodate the change in design.

Melvin Matter
June 1, 2020
Verified Purchase
New CO400 to replace old CO400

Very good unit to purchase. One thing to note. The model number was the same as old CO detector we had, however new one would not mount on old mounting brackets. The screws were at different lengths so had to drill more holes in the wall. Would be nice if the model number had consistancy.

Robert Nicosia
June 1, 2020
Verified Purchase
First Alert CO-400 Carbon Monoxide Alarm

This new CO detector is excellent. It replaces my previous CO-400 which needed to be retired after 8 years of reliable service. It makes sense to stay with a winner. The First Alert Store was a pleasure to deal with and they had my new detector in my hands within a week.

Michael Arden
May 20, 2020
Verified Purchase
So far so good

Seems to be working OK after a month

joseph dillon
May 10, 2020
Verified Purchase
The very BEST

Years of use...

How often do you need to change the batteries?
Actual battery service life depends on the particular design of your smoke or carbon monoxide alarm and the environment in which it is installed. All kinds of alarm batteries specified in the user's manual are acceptable replacement batteries. Regardless of the manufacturer's suggested battery life, you MUST replace the batteries immediately once the unit starts "chirping" (the "low battery warning"). It is recommended that you change the batteries in your alarms when you change your clocks for daylight saving time. Also consider replacing your current alarms with 10-Year Life Alarms that never require a costly battery replacement for the ten year life of the alarm. This 10-Year series is available in smoke, carbon monoxide and combination alarms.

How do I get my carbon monoxide alarm to stop chirping?
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.
Where should I install carbon monoxide alarms? What is proper carbon monoxide alarm placement?
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.
Is there anywhere I shouldn't install carbon monoxide alarms?
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.
How many carbon monoxide alarms should I have in my home?
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.
What is the proper way to do a carbon monoxide alarm test?
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.
Is it a false alarm when my carbon monoxide alarm sounds and there doesn't seem to be a problem?
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.
Will carbon monoxide alarms detect explosive gas leaks?
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.
I'm ready to change my alarm battery - what replacement batteries can I use?
Check your User's Manual or the nameplate on the back of the alarm. Different smoke detectors & CO alarms use different kinds of batteries - 9V, AA, AAA - it all depends on the particular model you have. Use quality batteries like lithium batteries - having plenty of power is worth any extra cost. Never use rechargeable batteries because they may not always provide a consistent charge.

Basic Battery Operated Carbon Monoxide Alarm

The First Alert CO400 Carbon Monoxide Alarm utilizes an electrochemical carbon monoxide sensor that lasts for up to five years to detect carbon monoxide. This carbon monoxide detector is battery powered, making it portable and easy to use anywhere, even in the event of a power outage. When carbon monoxide levels become elevated, a loud 85-decibel alarm alerts you to the threat.

The Most Accurate CO Sensor Available

The First Alert Carbon Monoxide Alarm uses an advanced electrochemical CO sensor to detect elevated carbon monoxide levels. When CO is detected, the carbon monoxide detector sounds an alarm to warn you of the threat.

Comprehensive Warning Features

When carbon monoxide levels rise, the carbon monoxide detector sounds an 85-decibel siren that is designed to wake even the soundest of sleepers. A low-battery light and alarm alert you when battery power is running low, and an end-of-life timer lets you know when the device should be replaced. Each CO detector lasts approximately five years.

Simple and Easy to Use

The First Alert Carbon Monoxide Alarm is easy to set up. Simply insert the battery, and the CO detector will start to monitor your space for carbon monoxide. There are no complicated displays or settings to navigate. A single button silences the alarm and tests the CO detector. A pull-down action chart instructs you of what to do if the CO alarm goes off.

Where To Place Carbon Monoxide Alarms: One on every level of the home and one in each sleeping area.

First Alert Carbon Monoxide Alarm CO400

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