‎Smoke & Carbon Monoxide Detector LED Status Light Colors | SimpliSafe Support Home

Smoke & Carbon Monoxide Detector LED Status Light Colors


The Smoke & CO Detector has several light states that reflect the status of the device and change when there is the presence of smoke or CO within your home. This guide will highlight the various indicators and their meanings.




Red LED blinks 3 times rapidly

3 chirps, 1 second pause, 3 chirps

Smoke detected

Red LED blinks 4 times rapidly

4 chirps, 1 second pause, 4 chirps

CO Detected

Yellow LED blinks twice every 4 seconds

Chirping once a minute

The Smoke & CO Detector is not connected to its mounting bracket properly. In order to keep the Tamper Switch pressed, ensure the detector is mounted correctly on the bracket. 

Blinking yellow light

Chirps once a minute

Battery is low. Learn how to replace it with the steps here.

Blinking yellow light

Chirps three times a minute

Malfunction and/or no longer operating within intended sensitivity. Please contact support for further assistance.

Green light blinks once every 50 seconds

No sound

Normal, detector functioning properly

No light

No sound

No power to the unit