Customer Reviews For The First Alert SA9120BCN 120VAC Hardwired Smoke Alarm with Battery Backup (1039816)

Overall Rating

4.9
183 Reviews
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182 customers recommend this product
John Meich
September 4, 2018
Verified Purchase

Replacement product is excellent and matches the current system!

Mark Chlebecek
June 12, 2018
Verified Purchase

Replacements for original units / Fit well

Margaret M Wytrwal
March 19, 2018
Verified Purchase
Smoke Alarm w/Battery Backup

Exactly what I had hoped for. Great pricing and quick delivery

Theodore Taylor
January 22, 2018
Verified Purchase
Ease of Installation and Price

The 3 smoke alarms were much improved over the last ones I bought years ago with respect to being able to insert the alarm into the bracket with ease. Also all the alarms go off in any one of them detects smoke/fire. Would recommend them to anyone seriously interested in their own safety!

Dennis Reimink
January 18, 2018
Verified Purchase
happy in safety

I changed all of our 14 year old smoke alarms. It took less than 1 hour. We hadn't known the alarms are only good for a defined time.

Joe D
January 17, 2018
Verified Purchase
Thank goodness your local

Our smoke detectors decided to kick the bucket New Years weekend after 15 long years! We were so glad you were local - we were able to pick up the replacement devices and saved a TON of money versus buying replacement devices from local big box stores. Your staff was so friendly and so accommodating! I hope all of my neighbors buy their replacement devices direct from you when the time comes!

jackie floen
January 10, 2018
Verified Purchase
Great service

No problem with orders, received exactly what I ordered, prompt delivery.

Kathy Romano
January 10, 2018
Verified Purchase

Easily replaced our existing alarms that are no longer working with these.

JoAnn Landry
December 26, 2017
Verified Purchase

Easy installation.

Ian Montgomery
December 26, 2017
Verified Purchase

Replaced a 8 year old unit, fit and worked as expected. Glad they still make this model. Would have been a pain to install another style.

Gangqing Hu
December 25, 2017
Verified Purchase
Low price, high quality and easy to install

The price for the three sets of 120VAC hardwire alarm I ordered from First Alert beats anywhere else. The shipping was fast and the installation was easy and straightforwards as the model is compatibile with the ones to be replaced in my house.

Eileen Trainer
December 19, 2017
Verified Purchase
really good product

completely satisfied. Thank you.

Raymond Dunleavy
November 7, 2017
Verified Purchase
Easy

Dealing with the first alert store was great. Order came on time and people I dealt with were VERY HELPFUL. Smoke alarm was a replacement from an old one. Matter of changing electrical cable and plugging in. Easy

Charyce Hill
October 24, 2017
Verified Purchase
120VAC Hardwired Smoke Alarm with Battery Backup

I have 12 of this smoke alarm in my home, all of which have been perfect for the past 12 years. Had to replace only one unit as a plastic clip that holds the battery in place broke. Highly recommended.

donald kreindler
October 4, 2017
Verified Purchase

swapped out older alarms and it was seamless

donald kreindler
September 20, 2017
Verified Purchase

Very happy with this product. I used it to replace an existing one and it just slipped right into place.

Gregory Hudspeth
September 6, 2017
Verified Purchase
Smoke Alarm

This is a great produce and easy to install.

Gregory Hudspeth
August 30, 2017
Verified Purchase
Hardwired Smoke Alarm

They are easy to install and work great.

Charles Stickney
August 28, 2017
Verified Purchase
Play it safe

I have six of these devices in use and they have just passed their warranty expiration date 10 years. It doesn't hurt to have a spare on hand.

Ed Shattle
August 24, 2017
Verified Purchase
Happy

My existing alarms are now going on 10 years old & all probably need to be replaced. I was extremely pleased to find my model on-line for a reasonable cost. Received it within a couple of days & easily installed it.

What is the proper placement of smoke alarms?
It is important that you have the proper placement for your smoke alarms. Install your alarms at least 20 feet from appliances like furnaces and ovens, which produce combustion particles. Alarms should be at least 10 feet from high humidity areas like showers and laundry rooms, and at least 3 feet from heat/AC vents. Be sure to install a smoke alarm in each bedroom, one at the top of each stairwell, and one on every level.
My smoke alarm keeps chirping and beeping. Why does my smoke alarm chirp intermittently?
It is likely that the reason your smoke alarm keeps chirping and beeping is that the battery is low. Whenever your smoke alarm keeps chirping, replace the battery immediately.

Other reasons include: It could be 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.

Why doesn't my smoke alarm sound when I push the test button?
It is important that you frequently test your smoke alarms. When you are testing your smoke alarm, there are a number of reasons why the alarm might not sound:
  • You may not be holding the test button down long enough. Try holding it down for up to 10 seconds (20 seconds on photoelectric models) .
  • Your battery may not be installed properly or snapped all the way in place. Even if the alarm sounded briefly when the battery touched the terminals, you still need to make sure it is snapped securely in place. If the battery is loose, in cannot power the smoke alarm properly. After installing new batteries, be sure to test your smoke detector.
  • Your AC power may not be on. AC and AC/DC units will have a power indicator light (red or green) that shines continuously when they are receiving electrical power.
  • If you have a 10-Year model, the smoke alarm may not have been properly activated. If the tab broke away before the alarm was activated, you can use a toothpick to move the switch over to test the alarm.
Why does my smoke alarm go off when I install a battery or turn on the AC power?
It is normal for smoke alarms to go off and sound briefly (up to 5-10 seconds) when you install a new battery or when they are powered up. If the alarm continues to go off and no smoke is present, the cause may be one of the following:
  • There may be insufficient battery power, try new batteries.
  • Problems with voltage or insufficient electrical power (brown out) may cause a continuous weak sounding alarm. For AC or AC/DC models, temporarily disconnect power at the service panel until the brown out is over. If you do not restore the AC power, your smoke alarms cannot warn you of a fire.
  • Incompatible warning device. If an incompatible alarm or auxiliary device is linked into a series of AC or AC/DC smoke alarms it may cause the system inadvertently go off.
My smoke alarm keeps chirping, even with a new battery. What is causing this?
There are a number of possible causes for your smoke alarm to keep chirping even with a new battery.
  • It is possible that your smoke alarm "silence" button was pushed by mistake. The alarm will now "chirp" once a minute for up to 15 minutes before resetting.
  • Are you sure it's the smoke alarm? Funny to ask, but other devices have similar low battery chirps or warning tones.
  • Your "new" batteries may not be fresh. If batteries are stored, especially in cold areas like refrigerators, they lose their charge more quickly. Always check the freshness date on the package when buying new batteries. Keep plenty of replacement batteries on hand so that you are sure to always be protected by your smoke alarms.
I lost my First Alert smoke alarm owner's manual. How can I get a new one?
First Alert smoke alarm owner's manuals are available online for download at no cost. Find your alarm in our Smoke Alarms section.
Why does the National Fire Protection Association (NFPA) recommend that home smoke alarms be replaced after 10 years?
Smoke alarms have a limited life. Although each smoke alarm and all of its parts have passed many stringent tests and are designed to be as reliable as possible, any of these parts could fail over time. Therefore, you must test the devices weekly. The unit should be replaced immediately if it is not operating properly. The performance of smoke alarms older than 10 years is simply not reliable. To ensure your family's safety, all carbon monoxide and smoke/CO combination alarms need to be replaced every 5-7 years. All smoke alarms need to be replaced every 10 years.

If it's time to replace your alarms, consider the NEW 10-Year Life series and never have to worry about a battery replacement for the life of the alarm.10-Year alarms are available in smoke, carbon monoxide and combination alarms.

120VAC Hardwired Smoke Alarm w/ Battery Backup

The First Alert 120VAC Hardwired Smoke Alarm with Battery Backup works exceptionally well in detecting flaming fires. Capable of wiring directly into your home's electrical system, this smoke detector features a near effortless installation process. This hardwired smoke alarm comes equipped with a Mute Button that serves the dual purpose of quickly silencing your detector as well as testing its function. The combination of a Battery Backup that provides optimal protection in the event of a power outage and an increased emphasis on the unit's 85db output establish the ultimate in peace of mind. This First Alert Hardwired Smoke Alarm comes with a 10 year limited warranty and complied with UL217 Standards. Save additionally with the option to bundle.

Ionization Sensor Reliably Detects Flaming Fires

The First Alert 120VAC Hardwired Smoke Alarm with Battery Backup comes equipped with an ultra-reliable ionization sensor to provide the earliest possible warning of a fast-flaming fire. The sensor is optimized to detect flaming fires, such as those caused by paper, kitchen grease, and other fast-combusting materials.

Test and Silence Button

Mute Button has been included to serve the dual purpose of silencing nuisance alarms and testing the functionality of your alarm.

EZ-Access Battery Door

The addition of an EZ Access Battery Door removes the hassles and burdens associated with changing your alarm's batteries.

Battery Backup for Detection During a Power Outage

This smoke alarm is designed for hardwired installation, but it also features a battery backup that helps ensure continued functionality in the event of a power outage. The unit comes with a 9-volt battery and features a pivoting, easy-to-access battery drawer that allows you to replace the battery without dismounting the alarm.

Works in Tandem with Other First Alert Alarms

In addition to functioning independently, this smoke alarm can also integrate with up to 12 other First Alert or BRK hardwired alarms for coverage of larger spaces. It also integrates with up to six other compatible devices, such as bells, horns, and repeaters. If one alarm in the series is triggered, they will all sound. The alarm features a latching indicator to identify which unit triggered the alarm, alerting you to the area of danger.

Recommended replacement for the following obsolete models:

BRK 4120B
BRK 4120SB
BRK 86RAC
First Alert SA4120B
First Alert SA4121B
First Alert SA4919B

First Alert 120VAC Hardwired Smoke Alarm with Battery Backup - SA9120BCN

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