Question about Kidde Nighthawk Combo Gas/co Detector

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When I replaced battery the screen reads 888, then a second later is reads Err what do I do

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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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My luxpro P711 was working fine , now the screen reads ERR. I have replaced the batteries and its still reads ERR. Any suggestions?


This is a thermostat, not a camera. If you re-post your query in a more appropriate forum, someone may be able to assist you.

Dec 31, 2016 | Cameras

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Detector shows 888 when first switched on then 0 then err with bleep


Showing 888 for a second is normal, it is a display test.
But Err means the unit is faulty or end of life (around 7 years), it can't be repaired so it should be disposed of and a new one bought.

Dec 20, 2010 | Kidde Nighthawk Combo Gas/co Detector

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Nighthawk carbon monoxide alarm model KN-COPP-3. ( ERR appears in the window, what does this mean ....


Readings You May See When Unit is AC Powered
Display Shows Alarm Sound Unit Status Recommended Action
Steady "Err" "Chirp" every Unit malfunctioning when Call KIDDE customer
and flashing dot 30 seconds AC powered service at 1-800-880-6788
Readings You May See When Unit is on Temporary Battery Backup
Display Shows Alarm Sound Unit Status Recommended Action
Flashing dot None Normal battery-only operation - Plug in to AC as soon as
unit will show reading only if it possible to conserve battery
senses CO
Flashing dot and "Chirp" every Unit malfunctioning when Call KIDDE customer
"Err" 30 seconds battery powered service at 1-800-880-6788

Hope this helps. Manual is here:
http://www.detectorsandalarms.com/images/pdf/Manual_KN-COPP-3_900-0100en.pdf

If this helps you resolve your problem, please consider giving a good rating and a quick thanks or good job.It will help me as well Thank you.

Oct 26, 2010 | Computers & Internet

2 Answers

ERR comes on screen...


Pull all the batteries, wait 30 seconds, put in a completely different card, put batteries back in and turn on and format the card--sometimes works

Aug 23, 2010 | Nikon D80 Digital Camera with 18-135mm...

1 Answer

Put a new fully charged battery in - the camera would lasted for a couple of minutes and then would not switch on. The battery works fine in an identical camera. Put in a second battery - that worked for a...


It is due to some kind of electrical contact failure.
For more details and common causes of Err 99 read the following article:
http://www.lensrentals.com/news/2008.12.31/canon-err99

Apr 26, 2010 | Canon Digital Rebel XT / EOS 350D Digital...

1 Answer

I replaced battery on honda vp 2004 and sound/clock system not working on screen i read 7 err or 5 err


honda is now puttin the code on the glove box / kopen the door and then look at the inside edge it will give you a code put it in

Jan 27, 2009 | 1999 Honda CR-V

4 Answers

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

Nov 10, 2008 | Kidde Nighthawk Combo Gas/co Detector

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