When checking out, simply select the "New Customer" option. All you need to get started is a valid email address and a secure password of your choosing. After your purchase is complete, your account will be created, and you will immediately gain all the benefits of being an account holder. If you have previously placed an order with us as a guest, you can try using the "Forgot Password" feature under the "Sign In" tab.
Benefits of having an account:
Real-time status updates on all your orders and returns.
Ability to view detailed order history.
Eligibility to enroll in subscription items for recurring discounts.
Access to more store features and quicker customer support.
Connection to a dedicated sales representative if placing bulk orders.
Manage your account settings:
Update your email address and password.
Unsubscribe from email promotions.
Manage item subscriptions.
Delete your account and remove your information.
We respect your privacy and are committed to protecting any personal information you may provide us through our Website. View our privacy policy for more info.
Replacing a smoke alarm is one of the simplest safety upgrades you can make at home. Even if an alarm still beeps during a test, the sensor inside can degrade over time, which is why most smoke alarms should be replaced on a regular schedule. This guide walks you through when to replace your First Alert smoke alarm, how to identify your connection type (battery vs hardwired), how to choose the right replacement, and how to dispose of old alarms responsibly.
When to replace your smoke alarm
Smoke alarms contain sensors designed to detect smoke particles. Over time, sensors can become less reliable due to normal aging, dust exposure, humidity, and environmental conditions. Replacing old alarms helps maintain dependable detection.
Age: Most smoke alarms should be replaced about every 10 years (check the date on the back).
End-of-life signals: Some alarms chirp or beep in a specific pattern to indicate end-of-life.
Repeated nuisance issues: Frequent false alarms or trouble codes after cleaning can indicate a unit nearing the end of useful life.
After damage: Replace alarms that have been painted over, cracked, water-damaged, or exposed to heavy contamination.
How to find the manufacture date
Remove the alarm from its mounting bracket and look for a date label on the back. If the alarm is near 10 years old, replacement is recommended even if it still tests.
Step 1: Identify your connection type
Before buying a replacement, determine how your current alarm is powered. This will help you choose the correct replacement style and avoid installation surprises.
Battery-operated (replaceable battery)
Alarm twists off a bracket and has a battery door (often 9V or AA).
No wires are connected to the back of the alarm.
Common in apartments, older homes, and quick retrofit installs.
Battery-operated (sealed 10-year battery)
Alarm typically states "10-year sealed battery" on the front or back.
No battery replacement door (battery is sealed inside).
Entire unit is replaced at end-of-life.
Hardwired (with battery backup)
Alarm is connected to household wiring with a plug-in harness.
Usually mounted to an electrical box in the ceiling or wall.
Often part of an interconnected system where all alarms sound together.
Step 2: Choose the right replacement
Choosing the correct replacement helps ensure proper fit, power compatibility, and (when applicable) interconnect functionality.
Match power type: Replace a hardwired alarm with a compatible hardwired alarm when possible, especially if your system is interconnected.
Consider sensor type: Photoelectric, ionization, or dual-sensor models can offer different nuisance resistance and detection strengths.
Interconnect needs: If your alarms are interconnected, choose a model that supports the same interconnect method (wired or wireless) and is listed as compatible.
Features: Voice alerts, location alerts, smart connectivity, or a hush button can improve usability.
Tip: Replacing one vs replacing them all
If multiple alarms in your home are the same age, it is often best to replace them around the same time so you can reset the "replacement clock" across the entire home.
Step 3: Replace a battery-operated smoke alarm
Twist the alarm counterclockwise to remove it from the mounting bracket.
Remove the old battery (if applicable).
Install the new alarm’s mounting bracket if the screw pattern differs.
Insert the battery (for replaceable-battery models) or activate the sealed battery if your model requires a pull-tab.
Attach the alarm to the bracket by twisting until it locks in place.
Press the test button to confirm proper operation.
Step 4: Replace a hardwired smoke alarm (existing wiring)
If you are replacing a hardwired alarm in an existing location with an electrical box and harness already present, replacement is typically straightforward. If wiring is missing or damaged, consider using a qualified electrician.
Turn off power to the smoke alarm circuit at the breaker panel.
Remove the alarm by twisting it off the mounting bracket.
Disconnect the wiring harness from the back of the alarm.
Install the new mounting bracket if needed (attach it to the electrical box).
Connect the wiring harness to the new alarm (use a harness adapter if included/required by the model).
Install the backup battery (if your new hardwired alarm uses one).
Attach the alarm to the bracket and restore power at the breaker.
Test the alarm using the test button.
If your alarms are interconnected
After replacement, test interconnect functionality. Press the test button on one alarm and confirm the other alarms in the network also sound. Repeat from a different alarm to verify the full system responds.
Step 5: After-install checklist
Test each alarm and confirm it sounds loudly.
If interconnected, verify all compatible alarms trigger together.
Write the replacement month/year on the inside of the alarm or keep a home maintenance note.
Vacuum around the alarm monthly to reduce dust buildup.
Disposal and environmental safety
Smoke alarms contain electronic components that should be disposed of responsibly. Local requirements vary, so check your municipality’s guidelines.
Do not burn or dismantle alarms.
Recycle electronics when available: Many areas treat alarms as e-waste.
Remove batteries: For replaceable-battery models, remove and recycle/dispose of batteries according to local rules.
Sealed battery units: Dispose as directed by local e-waste guidance.
If you are unsure
Contact your local waste management authority for e-waste and battery disposal instructions in your area.
Frequently asked questions
How do I know if my First Alert smoke alarm is expired?
Remove the alarm from the bracket and check the manufacture date on the back. If it is close to 10 years old, replacement is recommended even if it still passes a test.
Can I replace a hardwired smoke alarm myself?
If you are replacing an existing hardwired alarm with the same power setup and a working wiring harness, many homeowners can do it safely by turning off the breaker first. If wiring is missing, damaged, or you are unsure, use a qualified electrician.
Why is my alarm still chirping after I replaced it?
Chirping can come from a different alarm in the home, a low backup battery in a hardwired unit, a unit not fully seated on the bracket, or an end-of-life signal. Confirm which alarm is chirping and test each unit.
Should I replace all smoke alarms at the same time?
If your alarms are the same age, replacing them together can be a good approach so you maintain consistent protection and can track the replacement schedule more easily.
Ensure your home is protected with our First Alert smoke alarm installation guide. Learn the best placement for every room, understand NFPA recommendations, and avoid dead air zones to keep your family safe.
Learn where to install smoke alarms on every level and near bedrooms, plus where not to place them. Avoid “dead air” corners, vents, and ceiling fans for reliable detection.
Learn the differences between hardwired and battery smoke alarms and how to install each type. Includes wiring basics, placement tips, and when to choose each option.
Learn how to interconnect multiple smoke alarms so all units sound together. Covers hardwired interconnect, wireless options, compatibility tips, and troubleshooting.
Learn when to replace your First Alert smoke alarm, how to identify your connection type, choose the right replacement, install it safely, and dispose of old alarms responsibly.
Learn smoke alarm placement rules for apartments and rental homes, who is typically responsible for installation and upkeep, and hardwired vs battery options. Non-legal code basics included.
Learn where to install carbon monoxide alarms, how many you need, and placement tips for houses, apartments, and rentals - plus what to do when an alarm sounds.
Learn where to place carbon monoxide detectors for best protection - every level, near sleeping areas, and the right distance from appliances. CO alarms don’t need to be near the floor.
Compare hardwired, battery, and plug-in carbon monoxide alarms and follow simple installation steps for each type, plus placement tips, safety notes, and FAQs.
Learn what carbon monoxide is, where it comes from, what CO detectors detect (and don’t), whether they detect natural gas, and how to know if your home needs CO alarms.
Learn when to replace your First Alert carbon monoxide alarm, how to swap battery, plug-in, or hardwired models step-by-step, choose the right replacement, and dispose safely.
Learn CO detector placement for apartments and rental homes, who typically handles installation and battery changes, hardwired vs battery vs plug-in options, and basic code concepts (non-legal advice).
Learn how often to test smoke and CO alarms, how to test step-by-step, what to do if a test fails, how to reset First Alert alarms, and how monthly cleaning helps prevent false alarms.
Learn how often to test smoke alarms, how to test them step by step, what the test button checks, what to do if a smoke alarm fails, and common maintenance tips.
Learn how often to test carbon monoxide detectors, how to test them step by step, what the test button checks, what to do if a CO alarm fails, and helpful maintenance tips.
Learn what to do if a smoke alarm or carbon monoxide alarm fails testing, including battery checks, power checks, cleaning, reset steps, and when to replace the unit.
Learn how to reset a First Alert smoke alarm or carbon monoxide alarm step by step, including battery, plug-in, and hardwired models, plus common reasons an alarm needs a reset.
Learn how to clean a smoke alarm step by step, why dust buildup matters, how monthly vacuuming can help reduce nuisance alarms, and common cleaning mistakes to avoid.
Learn why your smoke alarm chirps, what beep patterns mean, how to prevent nuisance alarms, why alarms chirp after battery changes, and when it is time to replace an expired unit.
Learn why your smoke alarm is chirping, what different beep patterns may mean, and how to troubleshoot low battery, end-of-life, power, and sensor-related issues.
Learn why your carbon monoxide alarm is chirping, what different beep patterns may mean, and how to troubleshoot low battery, end-of-life, power, and sensor-related issues.
Learn why smoke alarms go off without visible smoke, what causes nuisance alarms from cooking, steam, humidity, and dust, and how to help prevent false alarms.
Learn why a smoke or carbon monoxide alarm may still chirp after a new battery is installed, including reset steps, battery fit issues, drawer problems, and end-of-life warnings.
Learn how to change a First Alert smoke alarm battery, how battery replacement differs from sealed 10-year battery models, and what to do if the alarm still chirps after replacement.
Learn how to find the manufacture date on a smoke alarm, why smoke alarms expire after 10 years, and why an alarm may need replacement even if it still seems to work.
Learn how to choose the right smoke, carbon monoxide, combo, or smart alarm. Compare sensor types, power options, connectivity, and key safety features.
Learn the basics of home safety, including early smoke and fire detection, carbon monoxide dangers, family fire escape plans, extinguisher use, and emergency escape ladders.
Learn why early smoke and fire detection matters, how smoke alarms provide critical warning time, and what families should know about placement, testing, and maintenance.
Learn what carbon monoxide is, where it comes from, why it is dangerous, common symptoms of CO exposure, and how carbon monoxide alarms help protect your home.
Create a family fire safety plan with a simple checklist covering escape routes, meeting places, smoke alarms, practice drills, and emergency planning for children and adults.
Learn the PASS method for using a fire extinguisher: Pull, Aim, Squeeze, and Sweep. Get step-by-step fire extinguisher tips, safety basics, and common FAQs.
Learn how emergency escape ladders work, how to test and deploy them safely, where to store them, and how they fit into a second-story fire escape plan.
Smoke Alarm Tips
Carbon Monoxide Alarm Tips
Interconnected Smoke Alarm Tips
Extinguishing Spray Tips
Other Safety Product Tips
All Home Safety Tips