Question about Kidde Kiddie - Nighthawk Kn-cob-lcb-a Fire Carbon Monoxide Alarm

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4 beeps with pauses for 2 year old carbon monoxide detector

Why is my 2 year old detector beeping 4 beeps with a pause and continue to do this? I had fire dept come check with no detection and the furnace repairman come in and we reset detector and it started beeping last night again after 4 day ago fire call

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  • 93 Answers

I'm pretty sure that indicates an alarm. The pattern is referred to as "temporal 4" which is the alarm pattern for CO. Either your device is in a bad place or there is an intermittent CO leak which is exceeding the ppm (parts per million) threshold for a given time period. The instructions for the device will tell you what that number is. If you have more than one of these, I would try swapping them to determine if the problen is with the device or the location. Good luck!

Posted on Jun 14, 2015

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Posted on Jan 02, 2017

  • 54 Answers

SOURCE: how to fix detector

You don't mention how old the detector is. If it is more than 5 years old the detector may be beeping to indicate the end of its service life. A smoke detector can last much longer but carbon monoxide detectors have a limited life span. If putting in new batteries doesn't fix the problem then most likely you will need to replace it.

Posted on Jun 10, 2010

  • 2 Answers

SOURCE: my smoke/carbon monoxide detector keeps

My Smotec 3786A indicates not to install it in above 85% humidity.
One of my three seems to go off annually or so and this is what
recently put it down to. I was making an espresso coffee on the
stove and it generates a lot of steam and off goes the fire alarm.
I did change the battery to no avail.

Posted on Mar 29, 2011

  • 2156 Answers

SOURCE: I have a Kidde Carbon Monoxide Detector , How do I stop it from beeping every 25 - 30 seconds?

replace the battery? hopefully it is not actually reporting carbon monoxide.

Posted on Mar 11, 2015

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2 Answers

I have two firex smoke and carbon dectectors, and 3 smoke detectors in bedrooms.


do they beep three times, pause then beep three times again? if so, they are going into alarm. since they all ring together, the only way to tell which one is causing the problem is to look for one where the leds are different than the others. If your detectors are more than 10 years old, replace them all as required by the national fire code (NFPA72). If they are only doing single chirps, that is usually an indication of a low battery...perhaps the breaker for the circuit has tripped causing them to run on battery only. good luck

Nov 27, 2015 | Kidde Firex 21007624 Ac Carbon Monoxide...

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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

Hi, I have two of your Nighthawk Carbon monoxide detectors, both under 2 years old purchased from Menards. about a month ago the one in the garage started beeping continuously saying it needed a...


Carbon monoxide detectors have a fixed life span. You did not post the model number and there is no way to tell how long it ago it or the parts in it, were made.

Mar 18, 2017 | 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

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

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How to fix detector


You don't mention how old the detector is. If it is more than 5 years old the detector may be beeping to indicate the end of its service life. A smoke detector can last much longer but carbon monoxide detectors have a limited life span. If putting in new batteries doesn't fix the problem then most likely you will need to replace it.

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If it is beeping 3 beeps every minute it is at the end of its battery life you can just replace the batteries by prising the cover off carefully.be aware though that the life span guarantee of these is only 5 years.

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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

1 Answer

KIDDE Nighthawk Carbon Monoxide alarm beeping


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

Jun 03, 2009 | Kidde Nighthawk Combo Gas/co Detector

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