Question about Kidde Nighthawk Combo Gas/co Detector

3 Answers

What does an err code E03 mean?

A kidde KN-COEG-3 nighthawk plug- in carbon monoxide and explosive gas w/battery backup beeps every 30 sec Err if I press peak level button I get E03 it has a new battery and is plugged in

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  • meycro Nov 26, 2008

    Same problem.

  • adaperry Dec 26, 2008

    Had the same problem 6 months after product was purchased. Huge disappointment.

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3 Answers

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  • Contributor
  • 7 Answers

Malfunction signal - Component failure. An intermittent "chirping" alarm will sound every 30 seconds, and an "Err" message will appear on the digital display. The only solution is to discard it entirely and replace with a new gas & carbon monoxide alarm.

Posted on Nov 10, 2012

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Correct. Intermittent beeping is a sign of "component failure". Time for a new one.

Posted on Dec 25, 2008

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

Posted on Dec 02, 2008

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1 Answer

My night hawk carbon monoxide reads L6. Then Err.


Lb (rather than L6) indicates a low battery. You need to replace the 9V battery in the carbon monoxide detector. The Err suggests an internal error but could just be due to the low battery.

If the Err persists after you replace the battery, press the peak level button (the right hand button) and check for an additional error code. If the Err message continues, replace the Night Hawk unit. If the unit is still under warranty, contact the manufacturer. Most of these units have a 10 year warranty. There are several models available from Kidde. The manual is available on the product site. For the KN-COPP-3 Night Hawk carbon monoxide detector, the documentation is available here: http://www.kidde.com/home-safety/en/us/products/fire-safety/co-alarms/kn-copp-3/ . Click on the Documents tab. The manual for the KN-COPP-3 999-0100 is here: http://www.utcccs-cdn.com/hvac/docs/2001/Public/06/User_Guide_KN-COPP-3_900-0100.pdf .

I hope this helps.

Cindy Wells

Dec 12, 2016 | Night Home Security

1 Answer

My unit keeps chirping every 30 seconds even after replacing the batteries. The unit is over 5 years old.


The manufacturer has written this in their manual for your unit...

"Err" displayed -battery icon may show any state of battery capacity. One quick beep every 30 seconds. Unit is Error condition

Replace batteries. If "Err" (or blank display) continues, unit has malfunctioned. Replace immediately.


Link to manual...

http://portalgb.knowledgebase.net/utility/downloadArticle.aspx?aid=294720

Feb 03, 2011 | Kidde Nighthawk 9000089 Carbon Monoxide...

1 Answer

Nighthawk carbon monoxide alarm model number KN-COPP-3 err beeping every 25-30 seconds, I replaced battery they still beep. They say to seek users guide, which can't be found. It seems to have started...



1. Change batteries.
2. Clean it.
3. Swap it with another location if you can.

If it still does not work properly consult the local fire dept. for free.

You may have to take it in repairs if all fails.

Nov 08, 2010 | Kidde Nighthawk Combo Gas/co Detector

1 Answer

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

1 Answer

I have a NIGHTHAWK CO2 DETTECTOR, it reads ERR & i dont know what it mean?


Should be a Carbon Monoxide detector (CO). The ERR display means the CO sensor is probably shot. Unlike most smoke detectors, CO monitors have a limited life span. Same thing happened to me and had to get a new one.

Oct 18, 2010 | Kidde Nighthawk Combo Gas/co Detector

1 Answer

My Kidde Nighthawk Carbon Monoxide detector was beeping shrilly and read gas. When pressed the reset button it read 221. Problem was it was sitting facedown in a box (i'd just taken it from my old...


A reading of 221 ppm carbon monoxide gas is a dangerous level that should be taken seriously. You could try a new battery and reset the detector. If in doubt, always err on the cautious side and have the apartment checked by a professional or by the local fire department.

A new carbon monoxide detector is a small investment that may prevent carbon monoxide poisoning or death.

Jul 22, 2010 | Kidde Nighthawk Combo Gas/co Detector

3 Answers

My Kidde Model # KN-COEG-3 keeps going off and lists 217 now 205 now again 217 and this is with the door open and fresh air coming into my place ??


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.

Nov 21, 2009 | Kidde Nighthawk Combo Gas/co Detector

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

9 Answers

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

Aug 13, 2008 | Kidde Nighthawk Combo Gas/co Detector

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