Your alarm manufacturer may have included a blinking red light to let you know it's time to test the alarm again. The Batteries are Low: Usually accompanied by a loud beep, a blinking red light could mean the batteries in the unit are low. Consider adding fresh batteries and running a test to make sure it's working.
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.
If you want to manually reset the smoke detector so that the red blinking light will stop, you can press the test/silence button for a few seconds. If your device includes a keypad press “*72” or if your smoke detector is hardwired, look for a reset button to push and hold for 20 seconds.
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.
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.
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.
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.
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.
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.
The CO alarm will sound if your sensor detects a high buildup of carbon monoxide in your home. Most people begin to feel the effects of carbon monoxide at 50 ppm, so be sure your detector can sense an amount of 50 ppm or less.
The National Fire Protection Association (NFPA) recommends changing the batteries in your smoke alarm every 6 months.
Press and hold the test button on the smoke detector. It can take a few seconds to begin, but a loud, ear-piercing siren should emanate from the smoke detector while the button is pressed. If the sound is weak or nonexistent, replace your batteries.
It's time to change the battery
Low batteries are the most common reason smoke detectors beep or send a trouble signal to your security panel, when there is no smoke or fire. As the battery weakens, the device will beep regularly to let you know it's time to replace it.
A solid green light on your smoke detector indicates that the device is on and operating normally.
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.
Oregon and Washington spider control experts share that the light within smoke detectors may attract spiders. When a spider crawls over the ionization sensor, the alarm thinks it senses smoke and sounds the alarm. A buildup of dirt may also trigger an alarm.
Power interruptions are common in areas where utility companies switch grids in the early hours of the morning. In AC or AC/DC smoke alarms, a loose hot wire connection can intermittently disconnect power to the smoke alarm. The effect is the same as a power failure. When power is restored, the units may alarm briefly.
We want everyone and their living space to smell good, but please spray away from the smoke detectors! Aerosols such as air fresheners or Febreeze and aromatherapy products should be used in moderation. Bodysprays, perfumes, and deodorants can all set off an alarm if the mist is in the direct path of the alarm.
In conclusion, the smoke detector may still be beeping even after the battery is changed because the battery may be low, the smoke detector may be faulty, or there may be dust or other particles in the smoke detector.