Why does my Kidde alarm beep every 30 seconds?

Author: Dr. Edward Borer MD  |  Last update: Wednesday, December 10, 2025

Low Battery – The carbon monoxide batteries need to be replaced. End of Life Warning – Seven years after initial power up, a Kidde CO alarm will begin chirping every 30 seconds.

How do I stop my Kidde smoke alarm from beeping every 30 seconds?

The battery may need to be replaced. An alarm will chirp every 30 to 60 seconds for a minimum of seven days. With a "low battery" announcement, disconnect the unit and replace the batteries. You can also put a unit into low battery hush for up to 12 hours on newer units by pressing the test/hush button.

How do I get my alarm to stop beeping every 30 seconds?

If your smoke alarm is emitting a single high-pitched chirp every 30 seconds or so, it's most likely a sign that the battery is running low and needs to be replaced. Stopping the problem is a simple matter of changing it out.

Why does my fire alarm beep every 30 seconds?

A single beep about every 30 seconds to a minute can mean the battery is low, the sensors are dirty, or the unit needs to be replaced. Multiple beeps can indicate a malfunction, or if the unit can detect carbon monoxide (CO), high levels of the gas may be present.

What to do if a carbon monoxide alarm beeps every 30 seconds?

When the detector is making chirping sounds every 30 seconds, this is not the same as a continuous siren. The chirping sound usually indicates the alarm is near its end of life and requires replacing. Carbon monoxide detectors have a seven-year lifespan. Replacing the battery does not stop this type of beeping.

Why Does My Kidde smoke detector keep beeping even after I change the battery?

Why won't my Kidde smoke and carbon monoxide alarm stop beeping?

Consistent Chirping

If your carbon monoxide alarm is chirping or beeping once every 60 seconds, it may signify: Low Battery – The carbon monoxide batteries need to be replaced. End of Life Warning – Seven years after initial power up, a Kidde CO alarm will begin chirping every 30 seconds.

What are two warning signs of carbon monoxide poisoning?

The most common symptoms of CO poisoning are headache, dizziness, weakness, upset stomach, vomiting, chest pain, and confusion. CO symptoms are often described as “flu-like.” If you breathe in a lot of CO, it can make you pass out or kill you.

How to reset kidde smoke and carbon monoxide alarm?

Resetting the Alarm
  1. Turn off the power to the smoke alarm at the circuit breaker.
  2. Remove the smoke alarm from the mounting bracket and disconnect the power.
  3. Remove the battery.
  4. Press and hold the test button for at least 15 seconds. ...
  5. Reconnect the power and reinstall the battery.

Do first alert smoke detectors detect carbon monoxide?

First Alert's Precision Detection Advanced Sensing Technology. Voice & Location Alerts for Danger and Helps Escape Safely. Provides Reliable 2-in-1 Protection Against Both Smoke and Carbon Monoxide.

Why does my Kidde fire alarm beep randomly at night?

This battery characteristic can cause a smoke alarm to enter the low battery chirp mode when air temperatures drop. Most homes are the coolest between 2 a.m. and 6 a.m. That's why the alarm may sound a low-battery chirp in the middle of the night, and then stop when the home warms up a few degrees.

Why do I hear beep every 30 seconds?

A single chirp – repeating every 30 to 60 seconds – means your alarm battery is low and needs to be changed. If your alarm continues to chirp after replacing the battery, that means the alarm unit needs to be replaced.

Why is my kidde 10 year smoke alarm going off for no reason?

Clean The Alarm

Dust and debris can affect the alarm. As far as it is concerned, the spider web or speck of dust that is obscuring the sensor is a potential fire and therefore the alarm needs to be sounded. The easiest way to clean an alarm is to run a vacuum cleaner over the vent.

What alarm goes off every 30 seconds?

Interpreting your carbon monoxide detector:

A single chirp every 30 or 60 seconds means the battery is low and must be replaced. CO alarms also have “end of life” sounds that vary by manufacturer. This means it's time to get a new CO alarm.

How to silence a kidde smoke alarm?

When the unit is in alarm,You can put your Smoke Alarm in HUSH mode by pushing the test/reset button. If the smoke is not too dense, the alarm will silence immediately, and the green LED will flash every 2 seconds for approximately 9 minutes.

Why is my smoke detector still beeping after replacing the battery?

If you replaced the battery and it's still beeping, the smoke detector might have expired like milk. Smoke detectors have an expiration date. The sensitive equipment inside can only work reliably for so long, so if yours is beeping and its expiration date has passed (or will in a year or two), it's time to replace it.

How do I permanently disable my Kidde smoke alarm?

Break through the label with a screw driver and turn the screw to the “OFF” position. This will deactivate the alarm, stop the end-of-life warning and render the alarm safe for disposal by draining the battery. IMPORTANT: Deactivation of the alarm is permanent.

How to stop a smoke alarm from chirping?

Clear Residual Charge to Stop the Chirp

Remove the alarm from your ceiling or wall. Open the cover and take out the battery. Press and hold the test button for 15-30 seconds. This will fully reset the smoke alarm and drain any charge left inside.

Are Kidde and First Alert smoke detectors compatible?

First Alert ADK-12 BRK/Kidde Smoke Alarm Adapter Plugs

The BRK ADK-12 Smoke Alarm Adapter Plug 12pk easily connects competitive alarms without rewiring. This product is compatible with BRK and Kidde Smoke Alarms and saves time and installation costs when retrofitting existing homes or apartments.

What does a blinking green light on a first alert smoke detector mean?

A flashing green light is a normal part of the power up cycle. Any time there is a power outage, brownout, surge or other problem with the power, the alarm goes through a power up cycle.

Why is my kidde carbon monoxide detector beeping every 30 seconds?

If the alarm emits a chirp every 30 seconds, it is either an end-of-life alert or a sensor error. If the alarm emits a chirp every 60 seconds, it indicates the battery power is not sufficient to power the unit in full alarm.

What is the life expectancy of a Kidde carbon monoxide alarm?

Kidde CO alarms have a proven life of seven to ten years, depending on the model type. Important Note! CO alarms do not detect the presence of CO when in end-of-life mode.

What to do if a carbon monoxide alarm goes off and then stops?

If you have a carbon monoxide detector chirping and then it stops, it's important to take the situation seriously, even if the alarm is no longer sounding. Even if the alarm has stopped, get everyone out of the home to a place with fresh air.

How to test a carbon monoxide alarm?

How to test your carbon monoxide detectors to ensure they are working properly? To test your carbon monoxide detectors, press and hold the test button on the alarm. The detector will sound 4 beeps, a pause, then 4 beeps for 5-6 seconds. Refer to the user manual for your specific model.

Can I call the fire department to check for carbon monoxide?

Yes, the fire department can check for carbon monoxide. If you suspect the presence of carbon monoxide in your home or building, it's essential to act quickly. Evacuate the area, ensure everyone's safety, and call your local emergency services or fire department.

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