Question about Kidde Night Hawk Combination Smoke and Carbon Monoxide Alarm

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Night Hawk Combination Detector beeps often and says "Battery Low".

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It is telling you that the battery needs replacement

Posted on Sep 02, 2013

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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

It was beeping every 15 seconds or so. I pulled unit off ceiling and checked batteries. Reinstalled. No more beeping. Do I need to replace batteries?


The beeping means that the detector was sensing low voltage from the battery. If the battery is over a year old, most manufacturers recommend yearly replacement on smoke detector batteries.

Dec 16, 2015 | System Sensor 2100rfadt Wireless Smoke...

1 Answer

Had customer with CO detector sounding quick double chirp about every five minutes. What is this?


This is not a beeping smoke detector. It is probably a CO detector that was installed by your alarm company. GE model 240-COE will give a double beep every 5.5 minutes when the device reaches end of life. Call your alarm company to have it replaced.

Jun 07, 2014 | Kidde DC Voice-Alert CO and Smoke Alarm

1 Answer

Emits beeping and says "battery low".


Open the cover to the device and change the battery.

Sep 01, 2013 | Kidde Night Hawk Combination Smoke and...

1 Answer

Beeping sound and message" battery low""


All smoke detectors need batteries often. The voltage must be 1.5 volts higher than what the voltage says on the battery used. Also electronics these days are touchy that you only use alkaline. So buy a new brand name alkaline that hasn't been on the shelve very long. Never use a used battery from another device in the house. Never buy the cheapest deal battery from a dollar store etc. Once the battery is replaced press the test button for 10 to 15 seconds to reset all. If you don't press the test button it may continue to beep or warn you. If you press the button just enough to test the alarm it may not reset properly. The longer 10 to 15 second test usually solves all issues.

Sep 01, 2013 | Kidde Night Hawk Combination Smoke and...

1 Answer

The night hawk carbon monoxide alram is beeping and has an L6 error.


"L6" is actually "Lb" which means "Low battery". If you just bought the battery it may be defective. Try a different, known-good one. If it works OK, return the first one for a refund.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 known-good batteries are not lasting at least a year in the unit, call the Kidde "Hotline" at 1-800-880-6788 and discuss the problem with their technical support section; you may be due a warranty replacement if the unit is still in warranty, usually 5 or 7 years depending on the manufacturing date. *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

Nov 01, 2010 | Kidde Nighthawk Combo Gas/co Detector

2 Answers

ERROR CODE L6


possibly low systm battery.......

Oct 17, 2008 | Kidde Nighthawk Combo Gas/co Detector

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