Question about Kidde Nighthawk Combo Gas/co Detector

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I have the model #KN-COSM-IBCA.....I have recently changed the batteries but it still continues to chirp everynow and then...Does the model have an expiry date?....

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If the display shows "Err", push and hold the Peak Level button. Does the display change to "E09"? If so, then you have just been "had" by the grossly under-documented "planned obsolescence feature" called, rather matter-of-factly, "End of Life". This means that ~7 years after first being powered up, the unit will, BY DESIGN, cease to function, forcing you to buy a replacement. Would have been nice of Kidde to include THAT warning on the OUTSIDE of the package. Call their "Hotline" at 1-800-880-6788 and tell them what you think of that policy. If it is still under warranty (5 or 7 years depending on date of manufacture) they should replace it. In any event, buy another one; if they replace your first one you will have twice the protection. Not a bad thing. *Disclaimer: I am not a lawyer, despite the handle. Words to live by: "Every creative act results from a sudden cessation of stupidity." -Edwin H. Land, inventor of the Polaroid LandCamera"The problem can always be solved with the materials in the room." -My college Physics Lab Instructor

Posted on Feb 01, 2011

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1 Answer

Will Kidde wireless smoke alarm model interlink with Kidde wireless smoke and carbon monoxide model


According to the Kidde website, model KN-COSM-B-RF can interconnect with "Up to 24 devices (of which 12 can be smoke alarms)", so I would say the answer is "yes". The Kidde website also offers a place where you can submit questions...I'm sure they would be happy to help you. Kidde KN COSM RF Battery Operated Wireless Interconnect Combination CO and...

Aug 09, 2015 | Home

2 Answers

I have a kidde/nighthawk model#kn-cosm-b. We started getting a chirp every 30 sec. I changed the battery hit the test button and it said warning fire fire then stopped then the chirps started 30 secs. I...


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.

Hopefully, that will clear up the problem. and accumulation of dust and lint will cause them to false at times.

Pressing and holding the test button for 5 seconds is "supposed" to reset the detector.

Feb 28, 2011 | Kidde Nighthawk Combo Gas/co Detector

1 Answer

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.

Feb 10, 2011 | Kidde Nighthawk Combo Gas/co Detector

3 Answers

My CO detector is chirping every 30 seconds or so, there is no battery to change and receiving error code 09


depending on what model number you have .. if its a model kn-cosm-b then is actually has 3 AA batteries inside ... the model kn-cob-lcb-a, while it runs on 120 volts, still has a 9 volt battery inside .. in fact most models have a battery backup so that they still work if there is a power outage .. the chirp indeed tells you that the backup battery needs changing .. if you cant find the battery give us the model number and we can help ... sometimes they are hard to find ..

Nov 05, 2009 | Kidde Nighthawk Combo Gas/co Detector

1 Answer

1 chirp every 30 seconds


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

Nov 29, 2008 | Kidde Nighthawk Combo Gas/co Detector

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