How do I test my carbon monoxide detector?

Most carbon monoxide detectors have a test button that you should press and hold for 2-3 seconds. You'll hear a loud beep or series of beeps if the detector is working properly. If there's no sound or a weak beep, replace the batteries immediately or replace the unit if it's hardwired.

Test your CO detector monthly to ensure it's functioning correctly. The test button only checks the alarm sound and electronics - it doesn't verify the actual carbon monoxide sensor. Look for a small button labeled "TEST" on the front or side of the unit. When you press it, the alarm should sound within a few seconds with a loud, piercing tone similar to what you'd hear during an actual emergency.

Replace the batteries at least once a year, even in hardwired units that have battery backup. Many detectors will chirp intermittently when batteries are low. If your detector is more than 7-10 years old, replace the entire unit as the sensors lose sensitivity over time. Check the manufacture date on the back of the detector.

In Ottawa's climate, carbon monoxide risks are highest during heating season when furnaces, fireplaces, and other fuel-burning appliances are running frequently. Never ignore a CO alarm - even if you think it might be a false alarm, evacuate immediately and call 911. Carbon monoxide is odorless and colorless, making working detectors your only early warning system.

Schedule annual HVAC maintenance to reduce CO risks from your heating system. A qualified technician will check for proper ventilation, cracked heat exchangers, and other issues that could lead to dangerous carbon monoxide buildup in your home.

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