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Homeowner?A single chirp every 40 seconds with an amber LED flash means the battery is low and needs replacing. A repeated alarm pattern with a red LED means CO has been detected. An EOL (end-of-life) alert means the 10-year sensor has expired and the unit needs replacing. Sleep Easy mode can silence low-battery chirps for 8 hours overnight. See our CO alarm beeping guide to identify the specific pattern.
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