A smoke alarm that won’t stop beeping can be both frustrating and concerning. If you own a First Alert model and it continues to chirp even when there’s no visible danger, there are several possible reasons. The good news is that most issues can be solved with a bit of troubleshooting at home.

Why Is My First Alert Smoke Alarm Chirping?

The most common cause is a low battery. Even hardwired models typically use a backup battery that must be replaced periodically. Other reasons may include sensor malfunctions, dust accumulation, or the need to reset the unit after a power outage.

Step 1: Replace the Battery

Start with the simplest fix—install a fresh battery. For most First Alert alarms, this involves opening the battery compartment, removing the old battery, and inserting a new one. Always check the expiration date on batteries before installation. If the beeping continues, move to the next step.

Step 2: Clean the Alarm

Dust or cooking residue can interfere with the alarm’s sensors. Use a vacuum cleaner with a soft brush attachment to gently clean the vents. Avoid using cleaning sprays, as chemicals can damage sensitive components.

Step 3: Reset the Device

After changing batteries or cleaning the unit, resetting may stop persistent chirping. Hold the test/reset button for 15–20 seconds. If the chirping stops, your problem is solved. If not, the unit might require replacement.

Step 4: Check the Age of Your Smoke Alarm

Smoke alarms are not meant to last forever. First Alert recommends replacing units every 8–10 years. Look for the manufacturing date on the back of your alarm. If the device is past its recommended lifespan, replacement is the best option.

Step 5: Test the Alarm

Once adjustments are made, press the test button. A loud alarm indicates the unit is functional. Testing should be done monthly to ensure safety.

Step 6: Hardwired Alarms

For hardwired models, ensure that the wiring is intact and that the breaker is supplying power. If the beeping persists after battery replacement and resetting, a wiring issue may be to blame. This typically requires professional assistance.

Preventive Maintenance

To avoid recurring issues, establish a routine maintenance schedule. Replace batteries at least once a year, clean the device regularly, and test monthly. Keeping a log of battery changes and tests can help you stay on top of maintenance.

Using the Correct Reference Material

When troubleshooting, always consult official documentation. First Alert manuals https://manuals.online/first-alert provide a First Alert user guide and First Alert instruction manual with detailed steps for each model. If you need deeper technical explanations, the First Alert service manual or operating instructions offer advanced troubleshooting advice and replacement part details.

Real-Life Scenario

A homeowner recently reported that their First Alert BRK 9120B alarm kept chirping even after a new battery was installed. By referencing the First Alert instruction of use, they discovered the problem was dust clogging the chamber. A quick cleaning resolved the issue immediately, saving the cost of an unnecessary replacement.

When to Replace Instead of Repair

If you’ve tried new batteries, cleaning, and resetting without success, and your smoke alarm is older than eight years, it’s time to replace it. Continuing to rely on a malfunctioning unit poses a safety risk.

Key Takeaway

A beeping First Alert smoke alarm doesn’t always mean a fire. Often, it’s a simple maintenance reminder or a sign of age. By checking the battery, cleaning the unit, resetting the system, and consulting the First Alert instruction manual, you can restore peace of mind and ensure reliable protection for your home.