Question about Kidde Nighthawk Combo Gas/co Detector

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1 chirp every 30 seconds

I have a Kidde nighthawke model # kn-cosm-ibca smoke and co alarm. It beeps only once a day ...usually 2-3 a.m.!!! I pull the battery and put back in and it seems to work fine for another 24 hrs. Any help please.

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It is not the battery problem, you need to get a replacement.
the circuite board is bad.

Posted on Dec 02, 2008

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Constant problems with these combo detectors. My best suggestion is unplug it from the wall, remove the battery, leave the battery compartment open, then using a can of compressed air that has a straw nozzle (like you clean your computer with) blow the dust and lint out of the unit. Pay particular attention to the grill vents on the front. When doing all of this, hold the can of compressed air as upright as possible. Replace the battery and plug it back into the wall receptacle.

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I have a KIDDE / NIGHTHAWK Combo Smoke / CO Alarm (Model #KN-COSM-IB). It is "chirping" once every 30 seconds. I understand this is an indication of alarm malfunction. My question is: what do...


Normally, that means the battery(s) need changing.. But, hundreds people have had problems with this combo detector, it's hard to predict what it is.

But, as I said earlier, "Normally that means the battery(s) need changing." The keyword here is "Normally".

Good luck. I hope that solves your problem.

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

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