# Smoke detector chirping: how to make it stop

Updated: 2026-10-24 · https://pros411.com/en/guides/electricians/smoke-detector-chirping

## Short answer

A smoke detector that chirps once every minute or so needs a new battery. Find which alarm it is, twist it off its base and put in a fresh battery of the type marked on it. Put it back and hold the Test button until it beeps loud. Still chirping? Check the date on the back: alarms over 10 years old need replacing. A loud, nonstop alarm is different: get out and call 911.

> Safety first: A loud, continuous alarm means smoke or fire: get everyone out and call 911 from outside. Use a sturdy step stool, not a chair. Never pull the battery to stop the chirp and leave the alarm empty.

## How to stop a smoke detector from chirping

![Cartoon smoke detector on the ceiling chirping for a new battery while a dog tilts its head](https://pros411.com/img/guias/smoke-detector-chirping.webp)

1. **One chirp every minute: low battery.** A single short chirp every 30 to 60 seconds means the battery is low. Stand under each alarm until you find the one chirping.
2. **Twist it off its base.** From a sturdy step stool, turn the alarm counterclockwise and lower it. Hardwired alarms have a backup battery too.
3. **Put in a fresh battery.** Use the type marked on the alarm, usually 9-volt or AA. Make sure it sits firmly and the battery door closes.
4. **Twist it back on and hold Test.** Hold the Test button until it beeps loud, then let go. On many models, holding it about 15 seconds also clears a leftover chirp.
5. **Still chirping? Check the date.** The date is printed on the back. Smoke alarms over 10 years old need replacing, the whole alarm, not just the battery.

## If it keeps chirping after a new battery

- Hold the Test button for about 15 seconds, then test it again.
- Make sure the battery is new, the right type and fully seated, with the door closed.
- Check the date on the back. Past 10 years, replace the alarm.
- Some alarms have a sealed 10-year battery. When they chirp, the whole alarm needs replacing.
- A hardwired alarm that chirps with a new battery may need replacing. If you are not sure, call an electrician.

## Chirp or alarm?

A chirp is one short beep every minute or so: the battery is low or the alarm is old. A loud, steady pattern of beeps is a real alarm: get out first, then call 911 from outside. On a combination smoke and CO alarm, a steady alarm can also mean carbon monoxide. Get out either way.

## What not to do

- Do not take the battery out and leave the alarm empty.
- Do not paint over an alarm or cover it.
- Do not disconnect the wires of a hardwired alarm.

## When to call an electrician

- A hardwired alarm keeps chirping after a new battery and a reset.
- Alarms go off again and again with no smoke.
- You want hardwired or connected alarms installed or replaced.
- An alarm is melted, discolored or smells burnt.

Find electricians in your city: https://pros411.com/en/electricians

## Frequently asked questions

### Why is my smoke detector chirping?

Almost always a low battery. One short chirp every 30 to 60 seconds means change it. If it keeps chirping with a new battery, the alarm may be old or need a reset.

### Why is my smoke detector still chirping after I changed the battery?

Hold the Test button for about 15 seconds to clear it, and make sure the battery is new and seated. If it still chirps, check the date: over 10 years means replace it.

### How often should smoke detectors be replaced?

Every 10 years, according to the NFPA. The date is printed on the back of the alarm.

### How do I find which smoke detector is chirping?

Stand under each one and wait a minute or two. On many models the little light flashes when it chirps.

### Why do smoke detectors chirp at night?

As the house cools at night, a weak battery loses a bit of power and the alarm starts chirping. It is still a low battery: change it.

### Do hardwired smoke detectors have batteries?

Most do: a backup battery for power outages. When it gets low, the alarm chirps like any other.

## Sources

- [NFPA: Smoke alarms](https://www.nfpa.org/education-and-research/home-fire-safety/smoke-alarms)