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Test Your Carbon Monoxide Detectors Regularly and Correctly
How Often to Test Your Carbon Monoxide Detectors
Carbon monoxide detectors should be tested at least once a month to help confirm they are working properly. Since carbon monoxide (CO) is an odorless, colorless gas, a working alarm is one of the most important safety devices in your home.
A monthly test is a quick way to check that the unit has power, the horn sounds correctly, and key electronic functions respond as expected. It is also a good idea to test your CO alarms after battery changes, power interruptions, or cleaning.
Why Regular CO Alarm Testing Matters
Unlike smoke, carbon monoxide cannot be seen and usually cannot be smelled. That means families often depend completely on a CO alarm to warn them of danger. Regular testing helps make sure the alarm is ready to alert you if carbon monoxide is detected from fuel-burning appliances, attached garages, fireplaces, furnaces, water heaters, or other sources.
In addition to monthly testing, there are several times when testing your CO detector is especially important.
Once a month as part of regular home safety maintenance
After installing a new alarm
After replacing the battery
After a power outage on plug-in or hardwired models
After cleaning the alarm
At the start of colder seasons when heating appliances are used more often
After the alarm has been unplugged or removed
Step-by-Step: How to Test a Carbon Monoxide Detector
Most carbon monoxide detectors have a built-in Test/Silence button that allows you to perform a basic functional check. The exact sound, voice message, or light pattern may vary by model, but the general steps are similar across many units.
Tell others in the home that you are testing the alarm. The sound will be loud and may activate interconnected units.
Safely reach the alarm. Use a stable step stool if necessary and avoid standing on furniture.
Press and hold the Test button. Keep holding it until the unit responds. Some alarms activate right away, while others may take a few seconds.
Listen for the alarm horn. The sound should be loud and clear.
Check for indicator lights or voice prompts. Some First Alert CO alarms provide visual confirmation or spoken status messages.
Verify other units respond if interconnected. If your alarm system is interconnected, compatible units may also sound.
Release the button and allow the alarm to return to normal. The unit should stop the test cycle and go back to standby mode.
What the Test Button Checks
Pressing the Test button usually checks the alarm’s internal electronics, power source, and sounder. This is the recommended routine test for homeowners and helps confirm the unit can produce an audible warning.
However, the Test button does not create real carbon monoxide inside your home. It is designed to verify basic alarm function, not simulate a real CO event. That is why regular testing should also be paired with proper placement, cleaning, battery replacement when applicable, and replacement at the end of the alarm’s service life.
How to Know if the Test Was Successful
A successful CO alarm test usually means:
The alarm sounds loudly and clearly
The unit responds shortly after pressing the button
Indicator lights or voice features behave normally for your model
Interconnected units sound if your system supports that feature
The alarm returns to normal standby condition after the test
What to Do if a CO Alarm Fails the Test
If your carbon monoxide detector does not sound during testing, sounds weak, or does not behave normally, work through these steps:
Check the power source. For battery-operated models, install a fresh recommended battery. For plug-in or hardwired units, confirm power is present.
Verify battery installation. Make sure the battery is installed correctly and the compartment is fully closed.
Make sure the alarm is properly attached. Some models must be fully seated on the mounting bracket to operate correctly.
Clean the alarm. Dust and debris around vents can interfere with normal performance.
Test again. Press and hold the Test button after completing the steps above.
If the alarm still does not pass the test, it may need to be replaced. Also check whether the alarm has reached the end of its rated service life.
Testing Plug-In, Battery, and Hardwired CO Alarms
The testing process is similar for most CO alarm power types, but a few extra checks can help depending on the model you have.
Battery-Powered CO Alarms
Check that the battery is fresh and properly installed
Make sure the battery door is fully closed
Test after each battery replacement
Plug-In CO Alarms
Confirm the unit is fully plugged into the outlet
Check the outlet has power
If the unit has battery backup, make sure that battery is also in good condition
Hardwired CO Alarms
Confirm household power is on
Test after power outages or electrical work
If the unit has backup batteries, replace them as needed and retest
Helpful CO Alarm Testing Tips
Pick the same day each month so testing becomes part of your routine
Test alarms during daytime hours when everyone is awake
Check alarms before colder weather when heating equipment will be used more often
Keep your model manual for reference on light patterns, voice prompts, and troubleshooting
Do not try to create dangerous conditions to test a CO alarm
CO Alarm Maintenance Goes Along With Testing
Testing works best when it is part of a full maintenance routine. Keeping the alarm clean and powered properly can help it perform more reliably over time.
Vacuum around the alarm monthly with a soft brush attachment
Keep the unit free from dust and debris
Replace batteries when required on applicable models
Do not paint or cover the alarm
Replace the alarm at end-of-life according to the manufacturer’s guidance
Common Mistakes to Avoid
Waiting until the alarm chirps before checking it
Assuming a power light alone means the unit is fully working
Forgetting to test after replacing a battery
Ignoring a weak or abnormal test sound
Leaving a battery backup missing in a plug-in or hardwired model
Skipping seasonal checks before furnace use increases
FAQs
How often should I test my carbon monoxide detector?
Carbon monoxide detectors should be tested at least once a month. It is also smart to test them after battery replacement, cleaning, installation, or power interruptions.
Does pressing the Test button create real carbon monoxide?
No. The Test button checks the alarm’s electronics, sounder, and basic functions. It does not generate real carbon monoxide in your home.
How long should I hold the Test button?
Press and hold the button until the alarm sounds. Some units respond immediately, while others may take a few seconds to begin the test cycle.
What should I do if my CO alarm does not pass the test?
Check the battery or power source, confirm the unit is mounted or plugged in properly, clean the alarm, and test again. If it still fails, the detector may need to be replaced.
Should interconnected CO alarms all sound during a test?
In many interconnected systems, yes. Testing one compatible alarm may trigger the others, helping confirm whole-home alert coverage.
Do I need to test a plug-in CO alarm if it already has power?
Yes. A power indicator only shows that electricity is present. You should still use the Test button regularly to help confirm the alarm can sound and respond properly.
Final Reminder
Testing your carbon monoxide detectors once a month is a simple step that can make a real difference in home safety. Because CO cannot be seen or smelled, regular testing helps make sure your alarm is ready to warn you when you need it most.
Learn how often to test smoke and CO alarms, how to test step-by-step, what to do if a test fails, how to reset First Alert alarms, and how monthly cleaning helps prevent false alarms.
Smoke Alarm Tips
Carbon Monoxide Alarm Tips
Interconnected Smoke Alarm Tips
Extinguishing Spray Tips
Other Safety Product Tips
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