Question about Kidde Nighthawk Combo Gas/co Detector

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Our alarm is chirping but not going off constantly, is electric so can't be battery, does it have a constant alarm when carbon monoxide is present? how do we reset it? we no longer have our guide

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These units, even though "plug-in" also have a 9 volt battery for backup purposes if the A/C goes off. If the display reads "Lb" it means the battery indeed needs to be replaced. Unplug the unit, turn it over and slide the battery access compartment open to replace the battery. If the display reads "Err" and the unit is still under warranty, call Kidde at 1-800-880-6788 to obtain warranty service. If the unit is out-of-warranty (5 or 7 years depending on manufacturing date) replace it as it will not detect CO if it is displaying "Err". *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 Jan 31, 2011

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Related Questions:

1 Answer

My CO alarm is beeping and the LED display says L6. What does that mean and what do I do?


If the alarm chirps every 60 seconds and the red LED flashes with "Lb" this indicates Low Battery.....replace battery as soon as possible!

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There is a good chance that the detector is being set off by fumes. This could be from hairspray, cleaning solutions, air fresheners, etc... Most aerosols use propane as a propellant and this will absolutely (and should) set the alarm off.

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Carbon monoxide alarm keeps going off after replacing battery


the battery door may not be closed properly. Or the mounting is not correct and the battery safety switch is still on.

Nov 10, 2013 | Kidde AC Wire-In Carbon Monoxide Alarm,...

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How can i shut off my kidde carbon monoxide detector, it is a constant alarm unless you remove the battery completely


Try another hard whack. If that does not undo the initial damage, nada will and you have a nice paper weight.

Sep 01, 2017 | Kidde Nighthawk Combo Gas/co Detector

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 detector is doing the one churp every 30 seconds which is indication of alarm malfunction. I have had it since Sept 2002. Is there anything I can do to correct this or is it beyone repair? I tried...


probably time for a new one. Most instructions for these types of units will tell you if it does the chirp after new batteries are installed, the unit has likely become defective. You got your money's worth from the unit. You can get better ones noew likely cheaper than the original one.

Dec 04, 2010 | Kidde Carbon Monoxide (KNCOBB) and Smoke...

2 Answers

Replaced 9 v batteries, units still chirping


This is the troubleshooting information from the kddie site. The problem is usually related to an older battery or improperly installed battery. You might also have to do a reset as described below. If battery and cleaning don't work, it might be time for a replacement - short money to keep you and your home safe.

  1. The battery may be loose, or improperly installed.
    Verify that a battery of the recommended type is securely installed. Make sure to use a battery with a use-by date no later than four to five years in the future. Check that the battery is snapped in completely so it cannot be shaken loose. It’s possible that battery connections may not be making good contact with the battery. Disconnecting and re-connecting the battery once or twice will likely fix this condition. On units with a front-load battery, be sure that the battery compartment door is closed completely as well. Loose white neutral wire can cause an echoing chirp. (From one unit to the next)

  2. The smoke alarm sensing chamber may be dirty.
    Dust and insects can collect in the sensing chamber of the alarm. An accumulation of dust in the sensing chamber can cause the unit to chirp. It is good practice to clean the smoke alarm when you change the battery. Static electricity from the ac quick connector attracts dust and can cause false alarms.

    Cleaning smoke alarms:
    To clean your alarm, remove it from the mounting bracket as outlined here. You can clean the interior of your alarm (sensing chamber) by using compressed air or a vacuum cleaner hose and blowing or vacuuming through the openings around the perimeter of the alarm. The outside of the alarm can be wiped with a damp cloth. After cleaning, reinstall your alarm, verify the green LED is on and test your alarm by using the Test Button. If cleaning does not restore the alarm to normal operation, the alarm should be replaced.

  3. Check environmental conditions:
    • Humidity, steam and condensation can cause false alarms. Causes of condensation are:
      • Extreme temperatures changes.
      • High ambient humidity.
      • Unit being installed in an uninsulated electrical box mounted on a ceiling beneath an attic. If this condition exists you’ll want to move the alarm. Click here to see the correct alarm placement in your user’s manual found in our Download Center.
    • Check to see if there is a cooling/heating register, a ceiling fan or an open window within 3 feet of the alarm. If there is, move the alarm away from the source of the increased airflow. Click here to see the correct alarm placement in your user’s manual found in our Download Center.
    • Check the temperature of the room. Smoke alarms operate at 40 degrees to 95 degrees Fahrenheit. Carbon monoxide alarms operate at 40 degrees to 100 degrees Fahrenheit.

  4. Reset the alarm.
    Some current model smoke alarms have a processor that retains certain error conditions, such as a weak battery. The error condition should reset when the battery is replaced but sometimes it does not and must be manually reset to clear the error.

    To reset an AC unit with a battery backup:
    Turn off the power to the smoke alarm at the circuit breaker.Remove the smoke alarm from the mounting bracket and disconnect the power. Remove the battery. Press and hold the test button for at least 15 seconds. The unit may chirp or alarm for a few seconds before going silent.Reconnect the power and reinstall the battery. The unit will chirp once when the power is restored and should not chirp afterwards.

    To reset a DC only unit:
    Remove the battery. Press and hold the test button for at least 15 seconds. The unit may chirp or alarm for a few seconds before going silent.Reinstall the battery. The unit will chirp when the battery is first connected but should not chirp afterwards.

  5. An electrical condition may be causing the power to the unit to be interrupted.
    If the AC power to the unit is interrupted, the unit will chirp when the power is restored. This could be caused by power surges.
    If the chirping seems to occur at about the same time in the evening or morning, it could be due to a surge created when the power company switches electrical grids to meet demand. Check to see if the chirp (or chirping) occurs when something else in the house is turned on such as an exhaust or attic fan, a heater, etc. If the smoke alarm is connected to a circuit with such a device, the alarm may chirp when the other device is switched on. If this is the case and the device is plugged into a wall outlet, move it to another outlet on a different circuit. If it is a hardwired device, have an electrician investigate it. These conditions can be minimized by installing your alarms on a dedicated circuit in compliance with NFPA requirements.

  6. Replace the alarm.
    If none of these conditions exist and the suggestions don't alleviate the symptom, the alarm should be replaced. Age may be a factor. Smoke and heat alarms should be replaced every 10 years, and carbon monoxide and combination alarms should be replaced every 7 years. Most of our alarms have a 5 year warranty from date of purchase (check your user manual for details). A date code is stamped on the label attached to the back of the unit.

Feb 02, 2010 | Kidde 1275 Hardwire Smoke Alarm with Hush...

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

My First Alert Carbon Monoxide Alarm has failed


If the carbon monoxide detector chirps, the battery may be dead. New batteries can be defective. Check if the light is yellow when the alarm is chirping, it means the battery is low, replace with a new battery.

Warranty service information:

UNITED STATES
BRK Brands, Inc.
3901 Liberty Street Road
Aurora, Illinois 60504
For consumer inquiries call: 800-323-9005

CANADA
Jarden Branded Consumables Canada
88B East ****** Creek, Unit 6
Richmond Hill, Ontario, Canada
L4B 4W2
Tel: 905-482-3720
Fax 905-731-8267
For consumer inquires call: 800-323-9005

If you are looking for new Carbon Monoxide Detectors, visit my website.

Oct 01, 2009 | First Alert Safety & Security Carbon...

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

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