A residential smoke alarm sounding repeated false alarms when the indoor air is completely clean and free of actual smoke or fire is experiencing sensitivity issues triggered by environmental contaminants. Common causes include accumulated dust, pet dander, cobwebs, or tiny insects trapped inside the optical sensor chamber; high humidity or steam condensing on internal circuits from nearby showers or kitchens; rapid temperature fluctuations near drafty windows; or electrical power surges on hardwired circuits. You can troubleshoot false alarms safely by pressing the central silence button. You can verify that your corrective action is successful when cleaning accumulated dust out of the sensor vents using compressed air, eliminating nearby steam sources, or replacing a malfunctioning smoke detector stops unprompted alarm activations permanently.
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