Question about Kidde Nighthawk Combo Gas/co Detector

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Nighthawk model kn-cop-dp, when plugged in i get an error code

I keep getting an error code when plugged in

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  • die2sk8 Jan 04, 2009

    came home and heard this plug-in CO detector chrping every 30 secs (almost like a battery operated smoke detedtor when the 9v battery needs to be replaced). An error code ( Err) was displayed . I un-plugged it and it still appeared. I pushed the test/reset button and still it displyed the error code?

  • djleo Jan 04, 2009

    Alarm chirps ~ every 30 seconds with "Err" displayed. I've attempted to reset the alarm as well as have unplugged the alarm and then plugged it back in with the same results.

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I have the same problem....The answer is the detector has died. This kind of detector has a warranty for 5 years. Mine was assembled 8 years ago and just died this morning. 8 years is good for this kind of detector. The protection device inside wears out in time. Thats why you keep getting an err message.

Posted on Jan 06, 2009

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Actually, it was a pre-planned detector death. See

http://www.fixya.com/support/t921754-carbon_monoxide_detector_err_code

These units expire automatically seven years after power up. Unfortunately this "feature" is only documented in for some models.

Posted on Mar 25, 2010

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You can get help at

https://portalgb.knowledgebase.net/display/4/search.aspx?tab=search&c=15121&cpc=i830o4bbvC82cRVePyldWo3I&cid=12758&r=

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If the display just reads "Err", the unit will not detect CO, so you might as well unplug it and remove the battery and get some sleep, but DO replace it as soon as possible. These units, BY DESIGN, cease to function ~7 years after they are first powered up. If it is still under warranty (5 or 7 years depending on date of manufacture. Call Kidde at 1-800-880-6788 to find out more. *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 Land Camera "The problem can always be solved with the materials in the room." -My college Physics Lab Instructor

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I HAVE A NIGHTHAWK MODEL KN-COP-DP ALARM AND CANNOT FIND THE MANUAL. IT IS BEEPING ONCE ABOUT EVERY MINUTE AND SHOWS AN ERROR CODE E-09 IT HAS NO BATTERY AND I CANNOT RESET IT. THANK YOU. GREGG HEBEL


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I took the following from the Kidde website. They only answer the phone Mon-Fri, from 8-5, EST. I checked it out because my almost new Kidde CO detector is showing an Error code.
The next time your carbon monoxide alarm has ERR on the display, push and hold the Peak Level button.You will see an E and an O followed by a number.Contact our hotline at 1-800-880-6788 and provide us the error code, along with the model number, assembly number and date of manufacture from the back of your unit.If your unit is under warranty, a replacement will be mailed to you.

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the sense is bad, unfoturally the unit need to be replaced.

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Nighthawk carbon monoxide alarm model kn-copp-b


Here is a link to the manual, or you can call the consumer hotline at 1-800-880-6788

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Carbon monoxide detector err code


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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