For most residential smoke detectors, blinks are common; you need to be conversant with the colors showing. Different smoke alarms use the green and red LED to indicate the device's power status such that a flashing green means low battery while a constant blink means AC power is connected.
Why Do Smoke Alarms Blink? Just about every residential smoke alarm blinks. This indicates that the battery/power supply is working properly. That said, a red light will flash all the time if it's operating correctly, but only about once or twice every minute or so.
The smoke alarm is desensitized by pushing the Test/Hush button on the smoke alarm cover. If the smoke is not too dense, the alarm will silence immediately and the red LED blinks every 10 seconds. This indicates that the alarm is in a temporarily desensitized condition.
Why is the green power light flashing on my First Alert® plug-in Carbon Monoxide Alarm? A flashing green light is a normal part of the power up cycle. Any time there is a power outage, brownout, surge or other problem with the power, the alarm goes through a power up cycle.
What does it mean? This is the power indicator light: First Alert and BRK alarms have a power indicator light to show you that your alarm is receiving power. Some alarms have a red or green light that blinks every few minutes, while other models blink rapidly or shine a solid light.
As the battery in a smoke alarm gets weak, the smoke alarm will “chirp” about once a minute to let you know that the battery needs to be replaced. Note: Only the device with a low battery will chirp. The other interconnected alarms should be silent.
A blinking red light on a smoke detector is rarely cause for alarm. Instead, it usually means that the battery is low, or the detector is in need of a minor repair. If you notice a blinking red light, replace the battery first – but only if you're sure that it's still good.
If your detector or alarm has a blinking or steady light with no audible alarm sound, this typically indicates that the unit is receiving power.
If your smoke detector has a blinking red light that flashes every 10 seconds, it means that it is reacting from the after-effects of smoke and is in a temporary desensitized state. When the smoke is no longer heavy in the air, the smoke detector should silence its alarm and the red light will start blinking.
The most likely reason smoke detectors go off unexpectedly is that people aren't changing the batteries in them often enough. In most sensors you might think of, the strength of the signal goes up when they detect what they're supposed to. Common causes of smoke detector false positives around the house.
This battery characteristic can cause a smoke alarm to enter the low battery chirp mode when air temperatures drop. Most homes are the coolest between 2 a.m. and 6 a.m. That's why the alarm may sound a low-battery chirp in the middle of the night, and then stop when the home warms up a few degrees.
Smoke detector shows steady green light – no alarm
Battery and electrical power smoke detectors will usually have a steady green light to let you know the detector has electrical power and is in working order.
Tip. Press the “Test,” “Silence” or “Hush” button to reset the smoke detector if it has a blinking red light. Press "*72" (star, seven, two) to reset a smoke detector on an alarm system with a keypad.
A flashing green light means that the smoke detector is getting the right amount of power supply. Basically, the green light indicates that the smoke detector is active. Red Light: The red light can indicate more than just an emergency threat. Your smoke detector blinking red could mean more than one thing.
Types of Smoke Detectors. Smoke and carbon monoxide detectors are essential safety equipment for your home. Smoke alarms sound an alarm when they sense the presence of smoke particles in the air, while carbon monoxide detectors sound an alarm when toxic levels of the invisible and odorless gas are detected.
If this happens, you must replace the batteries in your smoke detector. We recommend retesting the detector once the batteries have been changed.
Testing and Changing Your Fire Alarm Battery
If your smoke alarms are powered by a nine-volt battery, the battery should be replaced every 6 months, while the alarm itself should be replaced once every 10 years. For 10-year lithium-powered fire detectors, you won't need to replace the battery.
You Hear a Chirping Sound
A smoke alarm that needs attention will chirp for a long time, sometimes indefinitely, if it is hardwired to your electricity. But you'll want to make sure you take action ASAP once you hear that sound because it means the batteries in the smoke detector are going bad and need to be replaced.
Battery smoke detectors run solely on batteries. Hardwired smoke detectors run on electricity, but they also have a backup battery for power outages. When you hear a hard-wired smoke detector beeping, it means you need to replace its battery.
When the beeps sound, the alarm will also flash red. Low Battery: When your unit has a low battery, the LED indicator will flash yellow with one beep every minute. When a unit has a low battery, you should replace the smoke detector.
The most likely reason for an alarm sounding - without the presence of smoke or a fire - is dust inside the cover unit. If every alarm on the system is sounding, a rapidly flashing red light on the cover of one of the units will show where the alarm was triggered.
Dust, Dirt and Environmental Smoke
Dust and dirt that comes from activities like remodeling may set off your smoke alarms. To clean your smoke alarm, open it up carefully, and look inside for dust or dirt. Use a vacuum attachment or electronic aerosol cleaner to remove dust particles.
Smoke alarms need replacing after ten years. In all cases of nuisance beeping or false alarms do not disconnect your alarm or leave the alarm without batteries fitted.