Replace the battery with a fresh one
Make sure the battery is installed correctly
Press and hold the test/reset button
Clean dust and debris from the detector
Check for a loose battery compartment or cover
Replace the entire detector if it is old or malfunctioning
Check whether the detector is hardwired and confirm the breaker is on
Replace the backup battery in hardwired units
Reset the detector after changing the battery
Move the detector away from steam, humidity, or cooking smoke
Check the user manual for the specific beep pattern
Contact a licensed electrician or the manufacturer if the beeping continues