Question about Kidde Nighthawk Combo Gas/co Detector

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I have the kidde carbon monoxide and smoke alarm battery operated combo. The unit makes a single beep every 10 minutes or so. I have changed the batteries but the beep has not stopped. What's wrong?

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Remove the battery again and use the eraser end of a common pencil to clean the battery contacts inside the detector. Also get a brand new battery as often batteries sit on the store shelf or your own shelf and gradually lose power. J.

Posted on Oct 03, 2010

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Posted on Jan 02, 2017

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My Kidde carbon monoxide alarm keeps beeping every 30 seconds and we have put new batteries in it but it keeps beeping


Detecotrs have a limited lifespan of 5-7 years. So sounds like you need new one (Its not worth to buy just a sensor). Take a look on amazon Amazon com smoke alarm detector (watch out on reviews). I hope this was helpful. cheers

Jan 09, 2012 | Kidde Carbon Monoxide (KNCOBB) and Smoke...

1 Answer

I have model kn-cob-lcb-ca...it does not have a digital display, it was made in 2009..a few nights ago it started beeping...4 beeps, 5 second pause then 4 beeps continuously..the manual says this is a...


send the detector back and have it replaced,
The CO sensor will not alarm to levels of CO below 30 ppm and will alarm in the following time range when exposed to the corresponding levels of CO: 70 ppm CO Concentration 60 - 240 minutes 150 ppm CO Concentration 10 - 50 minutes 400 ppm CO Concentration 4 - 15 minutes The alarm shall include a piezoelectric horn that is rated at 85 decibels at 10 feet. When the unit detects carbon monoxide, the alarm pattern will be four (4) short beeps - followed by five (5) seconds of silence - followed by four (4) short beeps. The unit shall incorporate 2 LED's. A green LED will be illuminated to indicate the alarm is operating properly when plugged into an outlet, and will flash every 10 seconds when on backup battery power. A red LED will flash to indicate that carbon monoxide has been detected until the device is reset or CO is eliminated or will flash to indicate low battery or alarm malfunction. The unit shall at a minimum meet the requirements of CAN/CSA 6.19-01. It shall also include a 10-year manufacturer's limited warranty or

Test/Reset Button - Tests the unit for proper operation. Resets the carbon monoxide alarm.
• Tamper Resist Feature - If activated, unit goes into constant alarm mode if it has been unplugged or has come loose from the outlet.

Sep 20, 2011 | 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

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

2 Answers

Kidde nighthawk Carbon Monoxide & Smoke Alarm single beeps


If detector is more then 5 years old it will beep every 30 seconde to wirn you the sensor in the detector needs to be replaced. bying a new detector would be better.

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

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