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First alert model n0. sa4121b will not stop chirping after i put new batteries in.

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Posted on Jan 02, 2017

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SOURCE: The unit was not chirping but I decided to replace

Replaced another battery,brand new battery a must,press the test button,by letting it goes off like 30 or 40 sec. so it will detecting the new power of the battery.The chirping,will stop.

Posted on Nov 15, 2010

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I replaced all of the contractor installed smoke detectors with First Alert Model P1210 detectors.


The replacement smoke detectors may have had low batteries when installed or the contractor-selected mounting locations may be wrong.

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Smoke detector removed from ceiling. Only wires visible, but I still hear chirping.


Look at the detector you removed, and all others that may still be wired in.
They all have battery backup. Although the detectors are hardwired, the chirping is coming from one of the detectors to let you know to change the battery.

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Battery connection on new alarm Light Your Way Smoke and Fire alarm


If the battery will not make a connection, it may not be installed properly. The connector requires firm pressure.

My First Alert instructions say to "press and hold the test button on the cover for 5-20 seconds, or until the alarm sounds".

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3 new Kidde i4618 smoke detectors were put in last week. Last night one of them began chirping. I went to the store and bought brand new batteries and replaced them and tested the units which all worked....


smoke detectors work by smelling the air across a radioactive anode which upsets the electronics and sets off the alarm
it can be set off not only by smoke but by heat and gasses in the air
the new and better product is a photo electric detector which alerts earlier and can be installed connected to each room and into the house power or they come with a 10 years lithium battery
It could be a faulty unit so take it back for a warranty exchange unit

Oct 30, 2017 | Kidde 4618 Firex Hardwire Ionization Smoke...

1 Answer

The unit was not chirping but I decided to replace the battery. After I put in the new battery the unit is now chirping.


Replaced another battery,brand new battery a must,press the test button,by letting it goes off like 30 or 40 sec. so it will detecting the new power of the battery.The chirping,will stop.

Nov 15, 2010 | Kidde 4618 Firex Hardwire Ionization Smoke...

1 Answer

I have four of these smoke detectors in my home. They are all hooked together. Yesterday I put new batteries in all four and now they will not stop cherping. After about 8 hours I took the new batteries...


Three small chirps in one minute intervals means that the unit is needing service. The ion chamber in that unit has a fixed life span and when it expires, that is how it tells you. It is time to replace it. They usually last about 10 years.

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My First Alert Carbon Monoxide Alarm has failed


If the carbon monoxide detector chirps, the battery may be dead. New batteries can be defective. Check if the light is yellow when the alarm is chirping, it means the battery is low, replace with a new battery.

Warranty service information:

UNITED STATES
BRK Brands, Inc.
3901 Liberty Street Road
Aurora, Illinois 60504
For consumer inquiries call: 800-323-9005

CANADA
Jarden Branded Consumables Canada
88B East ****** Creek, Unit 6
Richmond Hill, Ontario, Canada
L4B 4W2
Tel: 905-482-3720
Fax 905-731-8267
For consumer inquires call: 800-323-9005

If you are looking for new Carbon Monoxide Detectors, visit my website.

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1 Answer

Low battery chirping sound: changed battery, but still chirping!!


try a another new battery sometimes they are no good if they where on the store shelf for to long of course the store wont tell you this. if this dosent work replace the unit its better to be safe than sorry


good luck

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