Question about Kidde Nighthawk Combo Gas/co Detector

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I have 3 Kidde KN-COSM-IBCA smoke and Carbon Monoxide Detectors on three different floors in my home. They are all new with a replace in 2016 sticker. About once a month the CO2 alarm goes off and keeps going. The first time I called the Fire Department who said their meter indicated nothing in the air. I have replaced all 3 batteries twice, blown air on the outside filter (clean) and replaced 1 of them for $65. Last night they went off again. Always the Carbon Monoxide alarm. I dont know what to do. Please advise with any help.

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Posted on Jan 02, 2017

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SOURCE: kidde Carbon Monoxide Alarms

I have a kidde carbon monoxide alarm, model KN-COPP-3.
No instructions. I was wondering how to start/set the unit to work?
Darlene

Posted on Aug 21, 2008

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frcs68
  • 1605 Answers

SOURCE: 1 chirp every 30 seconds

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

Posted on Dec 02, 2008

  • 4736 Answers

SOURCE: I have a kidde/nighthawk model#kn-cosm-b. We

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.

Posted on Feb 28, 2011

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Here is the link to the manual for your Kidde model KN-COB-LCB-A
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You may find more related information on my website. If you need a replacement or you need to add additional Carbon Monoxide Detectors in other levels of your house, you can purchase them here.

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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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