Carbon Monoxide Detector Still Beeping After Replacing Batteries? (It’s Not the Battery!)
TL;DR: If your carbon monoxide detector keeps beeping after you replaced the batteries, it’s probably not a battery issue at all. Most CO detectors have a 10-year end-of-life timer built into the unit. Once it expires, no amount of fresh batteries will stop the beeping. The only fix is to replace the entire unit. Here’s how to tell the difference and what to buy next. What Happened My Kidde carbon monoxide detector started chirping. Two quick beeps every 30 seconds