How long do carbon monoxide alarms last?
Most carbon monoxide alarms last 5 to 10 years. The lifespan varies by sensor; manufacturers commonly set 5 to 10 years, and many units signal an end-of-life warning.
Carbon monoxide has no smell, so the alarm is the only warning. These sensors wear out, and many units chirp on a set date to tell you so.
Typical lifespan: 5 to 10 years
The lifespan varies by sensor; manufacturers commonly set 5 to 10 years, and many units signal an end-of-life warning.
Carbon monoxide alarm maintenance checklist by season
Spring
Test each alarm with the test button. Check the manufacture or replace-by date printed on the unit.
Summer
Vacuum the vents gently. If you use a gas range, a generator or a charcoal grill, keep them outdoors and away from windows, and confirm alarms are on every level.
Fall
Before heating season, test and replace batteries. Have the furnace, water heater and any fireplace or flue checked, which the CPSC advises each year.
Winter
If the alarm sounds, get everyone outside and call emergency services. Do not go back in until the cause has been found.
Signs your carbon monoxide alarm needs replacing
- The unit signals end-of-life with a repeating chirp or an error message.
- It is past the date set by the maker, often 5 to 10 years after manufacture.
- It fails the test button.
- It was never replaced when the home was bought and you do not know its age.
Typical carbon monoxide alarm warranty
Warranties are commonly five to seven years on plug-in and battery units, and the ten-year models carry a similar term. Terms vary by brand and model.
An appliance warranty tracker keeps your carbon monoxide alarm's coverage dates and receipt in one place.
What to keep for a carbon monoxide alarm
- The receipt
- The manufacture or replace-by date on the unit
- The model number and a note of where each alarm sits
- Your furnace and water heater service dates
Common questions
How long do carbon monoxide alarms last?
Most carbon monoxide alarms last 5 to 10 years. The lifespan varies by sensor; manufacturers commonly set 5 to 10 years, and many units signal an end-of-life warning.
Where should I put carbon monoxide alarms?
The CPSC advises one on every level of the home and outside sleeping areas, following the manufacturer's instructions.
What do I do if my carbon monoxide alarm goes off?
Get everyone out into fresh air and call 911 or your fire department. Do not re-enter until it has been checked.
How do I maintain a carbon monoxide alarm?
Follow your manual first. Each season: spring, test each alarm with the test button. Check the manufacture or replace-by date printed on the unit. Fall, before heating season, test and replace batteries. Have the furnace, water heater and any fireplace or flue checked, which the CPSC advises each year.