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Question About BRK electronic Smoke Alarm 4120B
constant alarm sound!...

one nite the 6 smoke alarms in the house went off with a loud alarm sound, scared my 89 year mother so much! I had to disconnect them all and have tried connecting them again but they continue to make the loud alarm sound. what do I need to do? please help

Asked by Ramona on 03/29/2009 19  Answers

ManualsOnline posted an answer 15 years, 8 months ago

The ManualsOnline team has found the manual for this product! We hope it helps solve your problem. Get the Manual Here

Richard posted an answer 15 years, 1 month ago

5 I have BRK Electronics mod. 4120B, hardwired smoke alarms (9). The battery is difficult to change, the doors get stuck and jam. They are terribly made. I have broken(accidently) the door release trying to change battery. They also tend to chirp when you do get new batteries in. They should be replaced by company. They are there to protect my family, I have no faith in these smoke alarms help? Richard Bernal California 93012
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Westside Sales posted an answer 14 years, 9 months ago

4 Model 4120B is a discontinued model number. Doesnt have to do anything with replacing batteries since the americium-241in the unit is depleted, thus making the alarm sound or chirp telling the homeowner to replace. The new model to purchase is the model 9120B. This will last another 10 years before having to be replaced. Check link for purchasing information
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Ray posted an answer 14 years, 4 months ago

3 Mine were going of briefly every hour. Replaced batteries, but that only made it more frequent. Had to find the one that triggered first. removed battery, but it chirped if left plugged in. Removed from ceiling and kept pushing test button to drain the capacitor. Replaced the next morning. Thanks to "solution" about the depleated Americium-241, makes sense
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Beverly posted an answer 14 years, 3 months ago

3 I have the same problem and disconnected. Does the 9120b fit into the electrical clip that was used on the 4120b
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richard posted an answer 14 years, 3 months ago

2 I have had the same problem and disconnected them all. Does the 9120b fit into the electrical clip that was used on the 4120b?
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Phyllis posted an answer 15 years, 3 months ago

2 Can I buy a replacement at Home Depot of Lowes??
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Phyllis posted an answer 15 years, 3 months ago

2 I have been battling with this problem for weeks. Fire Department changed batteries and still have alarms go off on occasion. Just had them come again because one of them started to have a blinking red light. BRK Electronics, Model 4120B, 120 VAC, 60HZ
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Jeremy posted an answer 15 years, 1 month ago

2 Samr problem. This has happened on several occasiions, always at night and usually 2 or 3 am!!! The only way to stop it was by disconnecting ALL the alarms. I eventually found one of the alarms would continue to go off periodically when disconnected, and am replacing it. I will let you know if it works.
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Chrissy posted an answer 14 years, 7 months ago

0 We're having the same alarm problem. we dusted the alarms and changed the batteries and they are still alarming.
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Ruben posted an answer 14 years, 5 months ago

0 all of our alarms started to go off today, thinking there was a fire i was running through the house checking each room, garage, attic, crawl space, water heater room and outside thinking it was picking up smoke from somewhere. No fire though, did anyone contact the company for replacements or did you guys just go out and buy new alarms? Thank you for any help
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Jan posted an answer 14 years, 2 months ago

0 Our smoke detector is making a chirpping sound once every minute. We've disconnected the unit from its "house" and it seems like the chirpping is coming from the wiring!? Does that mean we must replace the whole thing? Wires and all? Please help.
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kris posted an answer 13 years, 3 months ago

0 4120b's replacemet 9120 should fit into same base based on my reaserach. I will try in few days. Will order today
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