Why Is My Carbon Monoxide Detector Beeping?
The pattern tells you. The Texas Department of Insurance says carbon monoxide alarms alert you with four beeps, and that a single chirp means the battery is low or the detector should be replaced.
If the alarm goes off, the Texas Department of Insurance says not to ignore it. Everyone should go outdoors, call 9-1-1 and stay outdoors until emergency responders say it is safe to go back in.
Replacement advice varies. CDC says to replace your CO detector following the manufacturer's instructions or every 5 years, and to check its batteries when you change your clocks each spring and fall. The Texas Department of Insurance says alarm sensors do not last forever, and advises replacing alarms every 10 years or when their end-of-life signals sound, and replacing alarm batteries at least once a year.
For placement, CDC advises battery-operated or battery back-up CO detectors near every sleeping area, and the U.S. Fire Administration advises CO alarms in a central location outside each separate sleeping area and on every level of the home.
Sources checked September 15, 2026. Every point below links the page it came from.
The sources behind this answer
- Government sourceThe Texas Department of Insurance says carbon monoxide alarms alert you with four beeps, and a single chirp means the battery is low or the detector should be replaced. Texas Department of Insurance ↗
- Government sourceIf the CO alarm goes off, the Texas Department of Insurance says everyone should go outdoors, call 9-1-1 and stay out until emergency responders say it is safe to go back in. Texas Department of Insurance ↗
- Government sourceCDC says to replace your CO detector following the manufacturer's instructions or every 5 years. CDC ↗
- Government sourceThe Texas Department of Insurance advises replacing alarms every 10 years or when their end-of-life signals sound, and replacing alarm batteries at least once a year. Texas Department of Insurance ↗
- Government sourceCDC advises installing battery-operated or battery back-up CO detectors near every sleeping area, and checking their batteries when clocks change each spring and fall. CDC ↗
- Government sourceThe U.S. Fire Administration advises installing CO alarms in a central location outside each separate sleeping area and on every level of the home. U.S. Fire Administration, FEMA ↗
Sources checked September 15, 2026. A brand statement is the company’s own claim, which we report but have not verified. Our grades are model-based estimates, not lab tests.