Question about Kidde Nighthawk Combo Gas/co Detector

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Have combination CO/Gas detector. Was charging a battery in the basement next to the detector. Suddenly, the GAS indicator with #215 displayed and meter sounded. Could the boat battery cause the alarm?

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  • 134 Answers

Lead-acid batteries under charge normally generate gas, hydrogen I believe. This is why all chargers designed for these type batteries (should) carry warning labels to not use them in confined areas. This likely set off the detector, providing a "real world" test of the unit. *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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1 Answer

How does a gas detector work?


work by signifying high levels of gases through a series of audible or visible indicators, such as alarms, lights or a combination of signals. While many of the older, standard gas detector units were originally fabricated to detect one gas, modern multifunctional or multi-gas devices are capable of detecting several gases at once. Some detectors may be utilized as individual units to monitor small workspace areas, or units can be combined or linked together to create a protection system.
Read more here: http://www.thomasnet.com/articles/instruments-controls/How-Gas-Detectors-Work

Jan 30, 2013 | Measuring Tools & Sensors

1 Answer

We have a Kidde Nighthawk Carbon Monoxide detector. Last week our breaker tripped and ever since then our detector has been beeping once every 15-20 seconds. The detector has a code 97 displayed. We can...


Haha, same thing just happened to me and really scared me. Thats not a '97' that is an upside down 'Lb' for low battery. According to the manual: "A 9V battery is needed. If battery is low or missing while the unit is plugged into a 120V outlet, an "Lb" message will display which will blink alternately with a the CO reading every second and the sounder will chirp every 15 seconds."

Mar 22, 2011 | Kidde Nighthawk Combo Gas/co Detector

1 Answer

My kidde nighthawk beeped once; shows a display of 250 and L6, what does that mean


OPEN THE BACK AND CONNECT THE RECHARGEABLE BATTERY WITH THE SMALL BLK WIRE THEN RECONNECT INTO AC POWER OUTLET AGAIN WAIT UNTIL IT DISAPPEAR ON THE WINDOW TO INDICATE DC CHARGED ALREADY

Mar 19, 2011 | Kidde Nighthawk Combo Gas/co Detector

1 Answer

My kidde carbon alarm chirp every 30 seconds and shows L6 on the dispaly, also the red light goes off and on


"L6" display & chirping sound, indicates you need to change the 9 volt battery in the detector.

If you have misplaced your User Guide, I have included a link to it, that you can download and print for future reference.

http://www.kidde.com/utcfs/ws-384/Assets/900-0113.pdf

Hope this helps you solve your alarming situation. :)

Mar 02, 2011 | Kidde Nighthawk Combo Gas/co Detector

1 Answer

Model kn-coeg-3 i get the gas alarm to go off once in a while. it shows around 253 on the display. i live next to dump. could there be methane gas in the air? i don't smell anything.


Yes, it's possible. But, the odor of methane gas from a landfill is usually noticeable.

My concern is where the combo detector is placed. It should not be in a room that a gas appliance is in. As, just the normal turning on and turning off of a burner, will leave a little residual gas in the air. But, it should dissipate very quickly. But, it could cause a false alarm, if the detector is in the same room as the appliance. Plus, the detector should always be plugged into a wall outlet no more than 2' off the floor.

Unfortunately, these Kiddie Combo Detectors are not all they cracked up to be. I respond at least once a day, to someones question about them. Many have had to return them to Kidde for repair of replacement. That's not a good track record.

My best advice is service (clean) the unit at least every 6 months, because they become clogged with dust, lint and/or pet air. You can accomplish this with a can of compressed air with a straw nozzle (like you clean your computer with). Remove the battery, which will give you some access to the interior of the housing and blow it out with the canned compressed air. Pay particular attention to the small vents on the front of the detector. Once complete, reinstall the battery and you're good to go. Don't forget to change the battery annually.

Hope this helps. Please let me know.

Feb 16, 2011 | Kidde Nighthawk Combo Gas/co Detector

1 Answer

Gas alarm going off. Reading 202. Battery is new


Interactive help for your detector at this link below.

https://portalgb.knowledgebase.net/display/4/kb/sf/sfhome.aspx?tab=sf&sfid=8029

you will need the model #. Hope this helps---

Jul 12, 2010 | Kidde Nighthawk Combo Gas/co Detector

3 Answers

Periodically emits 3 loud beeps. Displays 888.


The CO detectors require replacement of the battery periodically.

Unlike smoke detectors, the detector element itself also requires replacement as well as the battery and is sold as a module with the battery attached.

May 02, 2010 | Kidde Nighthawk Combo Gas/co Detector

1 Answer

I have 7 year old smoke and carbon monoxide alarm...I have put a new replacement battery and detector is chirping every 15 seconds or so


Check the expiry date on this unit. The manufacturer recommends replacement usually after 5 to 7 years depending on the model.

You bought a Combo Gas/CO Detector for protection against the hazards of Gas and Carbon Monoxide poisoning. A new unit will give you the peace of mind you are looking for.

Visit my website for more information and view most Brands and Models of Carbon Monoxide and Combo Gas/CO Detectors.

Dec 20, 2009 | Kidde Nighthawk Combo Gas/co Detector

1 Answer

We have a combination carbon monoxide/gas alarm and the gas alarm went off. We are having a girls party and it is in the basement and they are using nail polish and nail polish remover, some of it spilled...


This is normal your detector is sensing particles in the air.
Also You should never buy a duel detector. Because if one becomes
defective you loose protection from both detectors. It is recommended
to use two separate detectors, because different detectors are installed at different heights in the house. Not all gases are the same weight.
Also carbon or gas detectors should be replaced every five years. and smoke detectors every 10 years.

Sep 06, 2009 | Kidde Nighthawk Combo Gas/co Detector

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