ADT ADT Carbon Monoxide (CO) Detector Overview

ADT smoke, CO, or combo detector — life-safety wireless device for eligible ADT systems.

On ADT systems, this device is a supervised wireless peripheral (SiX on Command, Self-Setup RF on DIY hub, or Z-Wave for automation SKUs) — status appears in the ADT+ or ADT Control app, and faults can block arming depending on mode settings.

At a Glance

What This Device Does Well

Provides reliable status reporting and user-facing alerts through the ADT+ or ADT Control app when installed and enrolled correctly.

Before You Service or Replace One

• Platform — Command SiX vs Self-Setup sensor family — battery type and reset steps differ.
• Hub/panel online — must show connected in app before diagnosing sensor.
• Range — distant devices may need Range Extender, not a new sensor.
• Tamper — cover fully closed before declaring hardware fault.
• Monitoring mode — Practice/disarmed modes affect whether alarms dispatch.

Official Sources

• ADT product page
• https://help.adt.com/article/Carbon-Monoxide-Detector-Troubleshooting
• https://help.adt.com/article/Command-Carbon-Monoxide-Detector-SiXCOA
• https://help.adt.com/article/Command-Smoke-and-Carbon-Monoxide-Detector-SiXCOMBOA
• https://help.adt.com/article/The-Best-Carbon-Monoxide-Detector-Placement-for-Your-Home
• https://help.adt.com/article/Where-to-install-your-ADT-Carbon-Monoxide-Detectors
• https://help.adt.com/article/command-carbon-monoxide-detector-sixcova
• https://help.adt.com/article/product-ADT-Carbon-Monoxide-Detectors

Use official ADT help.adt.com support articles for reset procedures, battery types, LED patterns, and regional availability — ADT updates app flows frequently.