After the battery has been changed, the smoke alarm must clear errors, but it may continue to chirp even after the batteries have been changed. Some processor errors are still present in newer smoke alarms. Why does my smoke alarm turn off after I replaced the battery? Then, through the keypad, press “*72.” If your smoke detector is hardwired, you should have a reset button that you can hold for 20 seconds. You can press any of the test/silence/hush buttons for a few seconds to manually reset the smoke detector so the red blinking light does not appear.
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