First Alert Red or Green Light Flashing With No Sound
First Alert says a blinking or steady light with no audible alarm sound typically indicates the unit is receiving power.
Red or greenBlinking or steady with no soundverified
Device category
Smoke & CO Alarms Light Guide
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Important: Light colors are not universal. A blinking red light on one smoke & co alarms can mean something different on another brand or model.
Verified starter guides
Kidde Smoke Alarm Red LED Flashes Every 40 Seconds
On Kidde smoke alarm manual guidance, a red LED flashing approximately every 40 seconds can indicate the alarm is operating properly in standby mode.
RedFlashes approximately every 40 secondsverified
Kidde Smoke Alarm Red LED Flashing Once Per Second
On Kidde smoke alarm manual guidance, a red LED flashing rapidly or about once per second can indicate the alarm condition when the alarm senses products of combustion.
RedFlashes rapidly / about once per secondverified