What maintenance practice is recommended for CO detectors?

• A. Test regularly and replace per guidance; maintain units
• B. Do not test
• C. Always replace every year regardless
• D. Only test after alarm

Answer: (A)

Regular maintenance for carbon monoxide detectors centers on keeping them reliable so they can alert you when CO is present. The best practice is to test the unit regularly and replace it according to the manufacturer’s guidance. Using the test button confirms the alarm circuitry and sensor respond, and following the replacement schedule ensures the sensor stays accurate over time, since detectors have a finite life. Many units are designed to last several years (often 5–10) and may require battery changes or full replacement when the life is up. Keeping the device clean, ensuring it’s unobstructed, and installing it in the right locations are also important parts of maintenance so the detector can function as intended.

Choosing not to test leaves you unaware of a possible failure. Replacing every year regardless of the device’s life can waste resources and isn’t necessary for most models. Testing only after an alarm sounds misses the chance to catch a failing detector before CO exposure occurs, defeating the purpose of having a life-safety device.