The answer to 'why is my carbon monoxide detector not working' is that there are several common causes, including a dead or disconnected battery, sensor failure, or improper installation. Carbon monoxide (CO) detectors are critical safety devices that alert you to the presence of this odorless, colorless gas that can be deadly in high concentrations.
Some common symptoms of a malfunctioning CO detector include the alarm not sounding, the alarm sounding without reason, or the detector displaying error codes. Solutions may involve replacing the batteries, cleaning the sensor, or having a professional electrician inspect the wiring and placement of the detector.