Frequently asked questions
How to troubleshoot 755PSMA4 Smoke Alarm if it is beeping after replacing the battery ?
FAQ000191356
22 October 2025
Red LED flashing once every 40 seconds with one audible beep is a low battery warning.Replace the 9 V d.c. battery with a new one. (It is recommended to replace the battery annually)
To snooze a low battery beep for 10 hours, press the Test/Hush button for 3 seconds.
And if the smoke alarm continues to beep once every 40 seconds after a new battery replacement,
- Unclip the alarm from the base.
- Remove the new battery.
- Press and hold the test button for 20 seconds.
- Replace the new battery and clip it back to the base.