The answer to 'smoke detector burning smell' is that a burning smell coming from a smoke detector is usually a sign of an electrical issue that requires immediate attention. This could be caused by a malfunctioning component, a wiring problem, or the detector reaching the end of its lifespan.
Common symptoms include a persistent burning odor, visible smoke or discoloration, and the smoke detector not functioning properly. In some cases, the detector may stop working entirely. If you notice a burning smell, it's important to unplug or disconnect the detector immediately and investigate the cause. While minor issues may be fixable with basic troubleshooting, more serious problems will likely require the expertise of a professional electrician.