How to Carbon Monoxide Detector Check

Carbon monoxide is an invisible, odorless killer that can accumulate from malfunctioning furnaces, water heaters, gas appliances, or attached garage fumes—and you'd never know without a working detector. This life-safety task involves pressing the test button on each CO detector to verify a loud alarm, replacing batteries as needed, and checking manufacture dates since these devices have limited lifespans. Taking a few minutes twice a year to test your CO detectors provides the only warning you'd have of a potentially fatal gas leak.