Test CO detectors

1. Press test button – CO detectors have a test button that can be pressed to trigger the alarm sound and flashing light. This checks the electrical system.
2. Sensor test – Some models have a sensor test mode accessed by holding the test button. This verifies the sensor can detect CO and activate the alarm.
3. Replace batteries – While testing, replace batteries in battery-powered units to keep them running properly. Follow manufacturer’s battery replacement schedule.

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