Question about Kidde Nighthawk Combo Gas/co Detector

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Err. displaying replaced battery how do I reset?

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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 Land Camera"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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Posted on Jan 02, 2017


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These units, even though "plug-in" also have a 9 volt battery for backup purposes if the A/C goes off. If the display reads "Lb" it means the battery indeed needs to be replaced. Unplug the unit, turn it over and slide the battery access compartment open to replace the battery. If the display reads "Err" and the unit is still under warranty, call Kidde at 1-800-880-6788 to obtain warranty service. If the unit is out-of-warranty (5 or 7 years depending on manufacturing date) replace it as it will not detect CO if it is displaying "Err". *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 had the same problem my 3 yr old had been playing with the buttons and the whole thing just locked up and displayed ERR no amount of unplugging turning off would fix it.

Till ...........

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This discharges the program memory chip and resets to default.

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