Question about Kidde Nighthawk Combo Gas/co Detector

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My carbon monoxide detector keeps beeping in spite of replacing thebattery and gives an error code of E09. Also it keeps flashing an err on the led redout. I placed it outside and it is still doing it Thanks Stan

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Hopefully you have found a solution for your Carbon Monoxide Detector issue of October 4, 2009. The best solution for a questionable CO dectector is a replacement.

A Carbon Monoxide Detector is the only thing that will read, detect and sound an alert when reads dangerous levels of CO levels in your house. A defective carbon monoxide detector will give you and your family a false sense of security and will give you no protection.

Whenever in doubt, always err on the safe side and replace Carbon Monoxide Dectectors, your life depends on it.

View my website for related information and compare brands and models of Carbon Monoxide Detectors available for sale online.

Posted on Jul 27, 2010

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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 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

1 Answer

My carbon monoxide detector just has one sold beep and is not plugged in.


I assume you mean your carbon monoxide detector has one solid beep, and it is probably an AC unit. It may be safe to assume that it has battery backup if it is beeping without being plugged in.

First, you may replace the battery with a new one, plug it in and hit the reset button. If that doesn't work, you could bring it in to your local fire department to have it tested.

Check the expiry date on the Carbon Monoxide Detector. It should be replaced if it is more than 5 to 7 years old, check manufacturer recommendations.

A replacement carbon monoxide detector will give you the protection you need and peace of mind. Your safety depends on how fast you deal with this issue.

Jul 07, 2010 | Kidde Nighthawk Combo Gas/co Detector

1 Answer

How can I shut off my Kidde carbon monoxide detector when beeping


Here is the link to the manual for your Kidde model KN-COB-LCB-A
Carbon Monoxide Detector. This may help you solve your issue.

You may find more related information on my website. If you need a replacement or you need to add additional Carbon Monoxide Detectors in other levels of your house, you can purchase them here.

This issue should be solved immediately, Carbon Monoxide Poisoning can only be avoided by making sure you have good working CO Detectors in your house, camp or recreational vehicle.

Jul 24, 2010 | Kidde Nighthawk Combo Gas/co Detector

1 Answer

Error code keeps coming up on nighthawk carbon monoxide detector


An error code on a Carbon Monoxide Detector is a serious matter that should be looked at immediately. Your local fire department will be glad to help you with this issue.

If the error code keeps coming, it may mean that you have a defective unit. If the unit is new, you should be able to get a replacement where you boutht it. A unit that is more than 5 to 7 years old should be replaced, see manufacturer recommendations.

Browse my website for more information or for buying a replacement for a new Carbon Mononxide Detector.

Jul 16, 2010 | Kidde Nighthawk Combo Gas/co Detector

1 Answer

My nighthawk carbon monoxide alaram is keep biping


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.
ALWAYS treat an alarm as an emergency and follow manufacturer procedures.

Check our website for more industry information or for buying replacement Carbon Monoxide Detectors.

Jul 16, 2010 | Kidde Nighthawk Combo Gas/co Detector

1 Answer

My nighthawk Kidde carbon monoxide detector keeps beeping every 25-30 seconds. Do I need to buy a new one?


Some models of Carbon Monoxide Detectors will give an audible beep every 25-30 seconds after it has sounded an alert alarm. This may have happened when there was noone home to hear it. A periodic beeping sound may also indicate it is time to change the battery.

Solution: Install a new battery and check your manual for instructions on how to reset the system. Check the expiry date on your unit, it needs to be replaced after 5 to 7 years, according to the manufacturer specifications.

If you are in doubt that your Carbon Monoxide Detector is not working effectively, REPLACE IT. Your safety and your peace of mind is worth it.
View most Brands and Models of Carbon Monoxide Detectors online.

Jun 27, 2010 | Kidde Nighthawk Combo Gas/co Detector

1 Answer

Error code with a beeping-- reading 172 flashes


Call Kidde during business hours at the following number. I took the next paragraph off their website.
"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 18, 2009 | Kidde Nighthawk Combo Gas/co Detector

3 Answers

What does an err code E03 mean?


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

Nov 24, 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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