Question about Kidde 21007581 120v Firex Pro Basic Smoke Detector

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Replace battery on Kidde 21007581 120v wire-in smoke alarm

Replaced battery and now red light goes on and it doesn't beep when I press the test button.

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Posted on Jan 02, 2017

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  • 4 Answers

SOURCE: my kidde smoke and carbon monoxide alarm keeps

You will need to remove the unit from the ceiling to reveal the battery compartment on the back. It should just need to be rotated counter clockwise a small amount and will then come loose from the bracket. When installing a new battey be sure to press the battery reminder finger down into the battery compartment or the battery door will not close. Call the Kidde (pronounced kid-a) hotline if you have problems 1.800.880.6788

Posted on Aug 05, 2009

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SOURCE: We took the smoke alarm down because it was

it could be a parallel wire, connecting the smoke detectors to each other so that if one goes off they all go off, do the other smoke detectors have the same wire ?

Posted on Jan 24, 2010

  • 13 Answers

SOURCE: kidde smoke alarm won't stop chirping

Most smoke detecotrs have a limited lifespan of 5-10 years. On the underside of the detectors should be a sticker with installed dated or replace by date. If changing the batteries doesn't stop the chirping it is most like time to replace the detector. If you check the manufacturer website they will give you a life expectancy for your detector.

Posted on Mar 23, 2010

  • 13 Answers

SOURCE: I just fixed a new Kidde alarm hardwired with both

The normal condition for the green LED is solid. A flashing green LED indicates memory of a prior alarm condition. Press the test for at least 2 seconds to reset the detector memory.

Posted on Mar 23, 2010

  • 10 Answers

SOURCE: I have a Kidde combo smoke/carbon monoxide alarm

I assume your alarm is hard wired which should have its own circuit especially if there are any fluorescent lights on the same circuit.

Posted on Sep 01, 2013

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1 Answer

New smoke detector, new batteries, red light flashing is that normal


copied from the manual, available at the kidde website

RED AND GREEN LED INDICATORS This smoke alarm features separate red and green LED indicators. The LEDs indicate the following: GREEN LED CONSTANT ON - AC power is present. OFF - AC power is not present. RED LED - Can be seen through the Push-to-Test button. Blinks once a minute - Indicating presence of a working battery. Blinks once a second - Smoke alarm senses smoke and simultaneously sounds an audible alarm. Blinks once every 10 seconds - Smoke alarm is quieting an unwanted alarm (Model ADC only). (Interconnected system only): OFF - Another smoke alarm in the network has sensed smoke and is signalling this alarm.

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1 Answer

Some of Our Kidde i9040 alarms will routinely beep at night even tho I just replaced batteries 6 mo. ago. The alarms are only a yr. old. Why do they only chirp at night?


Make sure you use quality batteries. 9V lithium, sometimes called max life or ultralife may be just the ticket as they will likely last for years. Also be sure your smokes were wired correctly. If the beeping occurs only at might, perhaps they were improperly wired through a light switch, meaning that they may not be getting power all of the time. If you don't know how to check this yourself using a volt meter or tick meter, have an electrician check to be sure there are no wiring issues...good luck!

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1 Answer

Beeping sound and message" battery low""


All smoke detectors need batteries often. The voltage must be 1.5 volts higher than what the voltage says on the battery used. Also electronics these days are touchy that you only use alkaline. So buy a new brand name alkaline that hasn't been on the shelve very long. Never use a used battery from another device in the house. Never buy the cheapest deal battery from a dollar store etc. Once the battery is replaced press the test button for 10 to 15 seconds to reset all. If you don't press the test button it may continue to beep or warn you. If you press the button just enough to test the alarm it may not reset properly. The longer 10 to 15 second test usually solves all issues.

Sep 01, 2013 | Kidde Night Hawk Combination Smoke and...

1 Answer

I have a kidde i12020 ac wire in smoke alarm and i can't get it to stop beeping


Detecotrs have a limited lifespan of 5-7 years. So sounds like you need new one (Its not worth to buy just a sensor). Take a look on amazon Amazon com smoke alarm detector (watch out on reviews). I hope this was helpful. cheers

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1 Answer

Our hard wire smoke detector model i12060 just beeped really lound a few times and stopped, it glows green and flashes red every few minutes?


Change the 9V backup battery,with a new one.Push and hold the reset button for a minute or two for the alarm to to go off like about 30-40 sec. for the smoke detector to dectected the 9V backup battery power sourced.The green power LED light indicator will stop flashing also the beeping sounds too.

Jul 12, 2011 | Kidde 120-Volt Front Load Battery Smoke...

1 Answer

I have a Kidde combo smoke/carbon monoxide alarm and when my window air conditioner goes on the alarm goes off?


I assume your alarm is hard wired which should have its own circuit especially if there are any fluorescent lights on the same circuit.

Jul 06, 2011 | Kidde 120-Volt Front Load Battery Smoke...

1 Answer

Hello I have a KIDDE FYRNETICE smoke alarm.


According to the Kidde website, this unit was discontinued in 2010. If the unit is more than 10 years old it must be replaced per NFPA 72 (assuming you live in the US)

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2 Answers

Kidde nighthawk Carbon Monoxide & Smoke Alarm single beeps


If detector is more then 5 years old it will beep every 30 seconde to wirn you the sensor in the detector needs to be replaced. bying a new detector would be better.

Sep 21, 2009 | Kidde Nighthawk Combo Gas/co Detector

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