My smoke detector beeped last night, but there was no smoke. What is wrong with it?

This is a warning signal that the batteries are low. If your alarm is more than 10 years old, you should consider replacing it, just to make sure that you have one that is in good working order.

Check your state and local codes before starting any project. Follow all safety precautions. Information in this document has been furnished by the North American Retail Hardware Association (NRHA) and associated contributors. Every effort has been made to ensure accuracy and safety. Neither NRHA, any contributor nor the retailer can be held responsible for damages or injuries resulting from the use of the information in this document.