To stop your First Alert alarm from beeping, first press the Test/Silence button on the cover to temporarily quiet it. If the beeping is a low-battery chirp, replace the battery. If it continues after battery changes, the alarm is likely at its end-of-life and needs to be replaced.
To silence your First Alert alarm during a nuisance or false alarm, simply locate the large Test/Silence button on the front or center of the unit and firmly press and hold it for a few seconds until the alarm stops.
If your First Alert smoke alarm is beeping 3 times every 45 seconds, it is signaling an internal fault, a low battery, or the end of its operational lifespan. It is not an emergency alarm (which would be continuous beeping).
When a First Alert smoke alarm beeps after a power outage, it usually means the backup battery is low, the unit needs a reset to clear residual charge, or the detector has reached its 10-year expiration date.
To immediately silence a beeping alarm, first enter your user code and press Off or Silence on the keypad. Alternatively, you can press #, *, or the Reset/Cancel button. For persistent issues, look at the screen to identify the specific error (e.g., low battery, power loss, or lost connection) and address the underlying cause.
Step 1: Silence your alarm
To silence a nuisance alarm, press the Test/Silence button on your unit. This will quiet the horn so you can find what caused the alarm.
For a hard-wired First Alert smoke alarm beeping or chirping, the most common culprit is a depleted or dead backup battery, an expired unit (10-year lifespan), or loose wiring. Check the First Alert Troubleshooting Guide for complete step-by-step resolution.
For hardwired units, a steady green LED light indicates that the alarm is receiving AC power. Battery-operated units will have a quick flash every 30-45 seconds. However, this does not necessarily mean the alarm is working. Pressing the Test button is the only recommended method to ensure functionality.
To stop your smoke alarm from beeping immediately, press and hold the central Test/Silence button for 15–20 seconds. If it continues, twist the unit counter-clockwise to remove it from the ceiling or wall, take out the battery, and unplug the power connector if it is hardwired.
A smoke detector typically keeps chirping after a battery change because of a residual electrical charge, an expired unit, dust in the sensor, or a tripped interconnect.
How to deactivate your First Alert smoke alarm depends on why you are turning it off. Choose the appropriate method below based on your situation.
When a smoke alarm starts beeping intermittently (typically every 30 to 60 seconds), the likely cause is a low battery. The beeping is your signal to replace the battery before it runs out completely, so the unit can continue to provide protection. Aim to replace it sooner rather than later if you can.
The Silence button does not disable the unit. It makes it temporarily less sensitive. If Smoke around the unit is dense enough to suggest a dangerous situation or CO levels are extreme, the unit will stay in alarm or may re-alarm.
To silence a false alarm, press and hold the Test/Silence button on the face of the unit for 5 to 10 seconds. If your alarms are interconnected, locate the specific unit flashing a red light and press the silence button on that device.
A First Alert smoke alarm going off without smoke is usually triggered by dust, a weak battery, dead bugs in the sensing chamber, a power surge, high humidity, or the unit reaching its 10-year expiration date.
Most smoke detectors blink either red or green. A slow, single blink every 30 to 60 seconds is normal and simply means the unit has power and is actively monitoring your home. The specific color and its meaning depend on your device's manufacturer.
A carbon monoxide (CO) alarm emits four loud, continuous beeps followed by a brief pause. This cycle of four beeps repeats continuously. It sounds distinct from a standard smoke alarm, which typically emits three repeating beeps. Some units will also voice an alert, such as "Warning, Carbon Monoxide".
To immediately stop a First Alert smoke alarm from beeping, press and hold the Test/Silence button for 10-15 seconds to silence it and clear residual power. Next, twist the alarm counter-clockwise to remove it from the wall or ceiling, remove the old battery, and install a fresh one.
When your First Alert alarm chirps three times a minute, it means the unit has encountered an internal malfunction and must be replaced.
A hardwired smoke detector with a dying backup battery will typically chirp every 30 to 60 seconds for 7 to 30 days before the battery fully drains. However, if the chirping continues after changing the battery, it usually means the unit has reached its 10-year expiration date and is issuing an end-of-life warning.
Yes, a green light is perfectly normal. In most smoke detectors, a solid or slowly blinking green light means the unit is receiving power and operating normally.
On a First Alert smoke detector, the silence (or "hush") button is almost always the large Test/Silence button located in the center or on the front face of the alarm.
If your First Alert smoke detector keeps beeping or chirping after a battery change, it usually indicates a residual charge in the unit, an improperly seated battery, a dirty sensor, or an expired unit.