If they are facing the wrong side, obviously the smoke alarm will not be working and will keep flashing red light. This means the batteries should maintain their correct negative and positive position inside the battery compartment. If your smoke detector needs a pair of batteries, while putting back the new ones, they must be installed in the right way in their respective spots. So always do a double check before changing the old battery, and if you are unsure, contact the manufacturer and be sure to use the compatible battery. Using a compatible battery is the solution to this problem. Even worse, it can end up damaging the device too. If you have mistakenly replaced the old battery with the new but incompatible battery, your smoke detector will flash red light. So if your smoke detector is showing signs of being faulty and is blinking red after restoring the battery, get a new smoke alarm. The solution to a faulty smoke detector is the same as an old smoke detector, you need to change the whole device, not just the batteries.

And a defective smoke detector can cause problems like blinking red even if you have switched to the new battery. The smoke detector is an electronic device after all, so it can go faulty after all these years of using it. Then it’s clearly indicating that it’s time to change the old smoke detector. Solution:Ĭhanging the whole smoke detector device with a new one is the only solution that can solve the problem of your old device blinking red after putting back new batteries.Įspecially if you are replacing batteries twice a year and if it still blinks red with the new battery in it. After passing 8-10 years of using a smoke detector, it’s essential to replace it with a new one as the sensors become less accurate on older units.Īs a result, with weak sensors, the smoke detector is caused to blink red even after you have changed the battery.

Fire Administration, the average lifespan of a smoke detector is about 8-10 years.

Thus, the main causes are described below with their correct solutions for your knowledge. As several reasons are responsible for causing a smoke detector to blink red even after the old or faulty batteries have been replaced with new ones, anyone needs to know the reasons and the solution to the problems.

Download red flashing on smoke detector