Thanks for your message and for reaching out to Kidde. Nuisance alarms can occur for different reasons which include common things like —cooking, aerosols, steam, or dust entering the sensor. Here are some tips to help solve this… you can use the Hush feature if safe to do so (i.e., confirming there is no actual fire), clean the alarm thoroughly with compressed air into sensor openings, and ensure it’s placed away from kitchens and bathrooms, as well as HVAC vents and fans. If the behavior continues after cleaning and relocating, please contact 1-800-880-6788 for additional support or replacement options.