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BRK smoke Alarms (4120B) sound for no reason - do they need replacing

Alarm sounds middle of night when no cooking or other activity taking place. Sounds for one to five minutes and stops.

Posted by Anonymous on

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Posted on Jan 02, 2017

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  • 188 Answers

SOURCE: Alarms go off for about 30 seconds - usually in

Dust off and replace battery

Posted on Aug 02, 2009

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  • 5 Answers

SOURCE: alarms sound for no aparent reason

have you tried replacing the backup 9 volt battery?

Posted on Aug 13, 2009

  • 10865 Answers

SOURCE: my smoke alarms which are also hardwired into the

Your smoke alarms may be hard-wired and also have a battery backup. If this is the case, the batteries may need to be changed. If there is no battery issue, then it may be that the alarms have aged out and simply need to be replaced. Regards, Joe

Posted on Dec 20, 2009

  • 8457 Answers

SOURCE: My first alert smoke detector went off at midnight

Change brand new battery,every three months.Take some rubbing achahol clean the test button metal contact inside the detector.Well works correctly after these steps.

Posted on Jan 16, 2010

  • 4736 Answers

SOURCE: the alarms are hardwired together

They simply may need cleaning, due to a dust, lint or spider buildup in the sensors. You can accomplish this by using canned compressed air (like you clean your computer with) Attach the straw nozzle to the canned air, remove the detector cover(s) and with short bursts of air, clean the interior of the detector. When that's completed, blow out the detector cover. Before, your replace the cover, you should change the backup battery(s) in all the units, if it's been a year, since you last did it

Doing the above should solve your alarming problem..

Posted on Feb 18, 2011

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1 Answer

Why does my smoke alarms not all go off when I push test button?


I am assuming that your detectors are interconnected to all sound at the same time.
Pushing the test button is not the same electrically as an alarm activation.
The Kiddie manual does not mention the sequence of operations when the test button is pressed. You may want to contact Kiddie to find out if this is ok.
You can also test your detector with smoke to see if they all sound like they are supposed to.

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Two of my smoke alarms went off (no fire/smoke in or near house), one has a green light blinking and one has a solid green light, which need a new battery/reset?


The constant green LED means the alarm has AC power.
A flashing green light every 2 seconds without an audible alert means the unit recently sounded ( was the one activated ) and is now in latching mode to let you know that it was the unit that detected the problem. To clear the latching mode hold down the test button for 5 seconds.
Red LED flashing once per minute means that the back-up battery is connected and functioning.
Red light flashing constantly during alarm means that it is the unit that initiated the alarm siren.

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2 Answers

False alarms in the middle of the night


Sometimes an alarm will malfunction if a small spider or insect gets inside and also if it's in an area where it;s dusty will set it off as well. If you can take the face off you can lightly dust them or lightly blow them out with low air pressure. I even vacuumed our low one. High humidity will set them off as well.

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My kidde AC smoke alarm I12020 chirps at night then come daylight it makes no noise


Most "chirping" is indicative of low batteries. Perhaps your smokes are improperly wired through a light switch? As to locating, try using a piece of tape over the sound port to change the sound; with these problems there are often more than one causing it. Check also to see if you have any CO alarms that were plugged into a switched outlet. Most of these also have battery backup. Good luck!

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I have a series of 7 kidde ionization smoke alarms model 1276 hardwired with battery back up. The problem is all of the alarms will go off during the middle of the night for no apparent reason. The only...


Don't know for sure, but if your smoke detector is more than 5 years old, than you have to purchase new one (that's their average lifetime). Take a look on amazon: Amazon com smoke alarm . I hope I have helped. Cheers

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Two first alert smoke detectors go off for no reason. All are on 110 with good batteries. Have had these for approx. 12 years with no problems until now when 2 of the 7 have gone off many times in the last...


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1 Answer

Alarms sound for no aparent reason


have you tried replacing the backup 9 volt battery?

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