The answer to 'my carbon monoxide detector won't turn on' is that there are several common causes, including a dead or disconnected battery, a malfunctioning sensor, or a problem with the electrical wiring. Carbon monoxide detectors are essential for home safety, so it's important to troubleshoot and resolve any issues promptly.
First, check the battery - many detectors have a low battery indicator light or alarm that will sound when the battery is running low. Replace the battery and see if that resolves the issue. If the detector still doesn't power on, the sensor itself may be malfunctioning and need to be replaced. Lastly, make sure the detector is properly wired to the home's electrical system. If you're not comfortable working with electrical components, it's best to call a licensed electrician to diagnose and fix the problem.