Installing a Kidde carbon monoxide (CO) alarm is a critical step in protecting your home from this invisible, odorless threat.
But after setup, understanding how your CO alarm works, when to replace it, and how to troubleshoot issues is equally important.
In this guide, we’ll answer common questions about your Kidde CO alarm’s lifespan, beeping alerts, and key features like the Test/Reset button.
What Does the “End of Life” Warning Mean on your Kidde CO Alarm?
Kidde CO alarms are designed to last 7–10 years (depending on the model). When your alarm reaches its end of life, it will emit a 30-second chirp that cannot be silenced by replacing the batteries. Here’s what you need to know:
- Why it happens: The internal sensors degrade over time, making the alarm unreliable.
- What to do: Replace the unit immediately. Note: The alarm cannot detect CO once it enters end-of-life mode.
- How to confirm: Check the manufacturing date code on the back/side of the alarm if you’re unsure of its age.
When Should You Replace Your Kidde CO Alarm?
Replace your Kidde CO or combination alarm every 7–10 years, even if it appears functional. Key signs it’s time for a replacement:
- The alarm triggers the end-of-life chirp.
- The manufacturing date shows the alarm is past its lifespan.
- Never ignore a continuous chirp—this is a safety-critical alert!
Why Is Your Kidde CO Alarm Beeping or Chirping?
A beeping CO alarm can signal multiple issues:
- Low battery: Replace the battery with the recommended type (check the manual).
- Loose battery: Ensure the battery is properly installed.
- Malfunction: If the alarm beeps randomly, test it (see Section 4).
- End-of-life alert: A 30-second chirp that persists after battery replacement means the unit must be retired.
What Do the Test/Reset and Peak Level Buttons Do?
Test/Reset Button
- Function: Tests the alarm’s electronics. Pressing it triggers a self-check (the LCD displays “3 bars” → “888” → “0”).
- When to use: Test monthly and after battery changes.
Peak Level Button
- Function: Displays the highest CO level recorded since the last reset.
- How to reset:
- Press and hold the Peak Level button.
- While holding it, press and hold the Test/Reset button for 2 seconds.
- Release both buttons simultaneously.
- Post-reset action: Monitor for recurring CO readings. If levels reappear, investigate potential sources (e.g., gas appliances, paint fumes).
Final Tips for Optimal CO Alarm Performance
- Test: Use the Test/Reset button to ensure functionality.
- Replace batteries: Should be replaced every 7/10 years ( depending on the model )
- Keep a log: Track installation dates and battery replacements.
- Never disable alarms: Address chirps immediately—your safety depends on it!
By understanding your Kidde CO alarm’s lifespan, alerts, and features, you’ll stay prepared to act swiftly in an emergency. Protect your home—replace outdated units and test regularly!