The answer to 'carbon monoxide detector burning smell' is that a burning smell coming from a carbon monoxide (CO) detector is often a sign that the device needs to be replaced. CO detectors have a lifespan of 5-7 years, and the internal sensors can degrade over time, causing a burning or acrid smell as the device reaches the end of its usable life.
If you notice a burning smell coming from your CO detector, it's important to replace the device right away. Continuing to use a malfunctioning CO detector puts your family at risk, as it may not accurately detect dangerous levels of the odorless, colorless gas. Be sure to follow the manufacturer's instructions for proper disposal and installation of the new detector.