Question about Kidde Nighthawk Combo Gas/co Detector

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Have a Nighthawk CM Detector and it has gone off for no apparant reason. Whatever I did does not stop the alarm continually bleeping. I turned off main electric and it carried on for about 20 mins. I have tried pressing the reset button but still carries on. On the booklet the model number says "Power Lead Model (hash 900-0082-02). Please can you advise? Thank you Mrs Pat Palmer

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  • 134 Answers

If the display shows "Lb", the battery is probably low; replace it. Make sure you are buying brand-name batteries, EverReady, DuraCell, etc. not some cheap knock-off brand you may never have heard of. There is absolutely no quality control or minimum performance specifications for batteries that are marketed in the US and there is some REAL trash out there. 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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Apparently, this is happening a lot, as I have answered this question many times on this forum.

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Good Morning, My nighthawk CO detector went off with a loud continuous alarm this morning while all were sleeping. I reset it and it is not alarming now. I pushed the peak button and it reads 19. The...


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The instructions in your manual would direct you to evacuate the house immediately and ventilate. Your next step is to get a professional to inspect what may have caused the carbon monoxide leak.

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Check your user manual for issues dealing with beeping alarms.

Your local fire department may be able to help educate you on the proper installation and use of Carbon Monoxide Detectors. A CO detector alarm should be taken seriously and you should follow the manufacturer procedures included in the package.

NEVER dismiss a Carbon Monoxide Detector Alarm for a malfunction.
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Check our website for more industry information or for buying replacement Carbon Monoxide Detectors.

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