Do Carbon Monoxide Detectors Expire? Sensor Life and Replacement: Complete Guide for Homeowners | WC Safety
Carbon monoxide detectors do expire, because the electrochemical CO sensor inside has a finite life and degrades whether or not the alarm has ever sounded. UL 2034 governs these alarms and requires an end-of-life warning. This guide covers sensor lifespan, the date code on the back, the end-of-life chirp, and a worked replacement example.
Read now