Question about Kidde Firex 21007624 Ac Carbon Monoxide Smoke Alarm

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Are there any reported problems with the Firez 21007624 carbon monoxide detector false alarms?

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I do not know of any reported problems specific to the Kidde CO/smoke alarm, but I spent a significant part of my career servicing toxic gas sensors and can give you some general advice:

1- Most important: treat an alarm as a REAL alarm and DO NOT suspect that your alarm is a "false alarm". My experience has been that most "false alarms" ARE REAL and the source needs to be identified! With Carbon Monoxide detectors, it is usually a blocked vent for a gas fired appliance- a hot water heater, furnace, or oven. Call your fire department or a service professional to make sure that there is no carbon monoxide. They have portable detectors that will be able to double check your alarm.

My advice to you at this moment is to act as if you have a real alarm condition and do not place you or others in a life threatening situation. Ventilate the room/ apartment/house IMMEDIATELY!

I will post more after I send this because you may be in a life threatening situation!

Posted on Mar 22, 2011

  • Victor Albright Mar 22, 2011

    OK- hopefully you did the right thing and are taking some sort of action to eliminate any risk....



    Most often...I would say 90+% of the time, the sensor is right.



    There are certain conditions where "interferants" will cause false alarms, but it is rare in most installations.



    The most common interferant is RF, or "radio frequency" and it is usually related to improper installation of the sensor.... like plugging it in next to a microwave oven. Using cell phones, bluetooth, or wi-fi devices within 3 feet of a sensor can cause false alarms.



    Other things that will cause false alarms are exposure to high levels of solvents, like nail polish remover, isopropyl alcohol, spray waxes, gasoline, etc.... if you suspect anything like this, the levels are probably toxic and you need better ventilation anyway.



    This will sound like I am trying to be funny, but no joke- ******* by a sensor will set it off. I have seen where a CO sensor was plugged into a low outlet and a dog "cut one" next to it and it alarmed! The dog freaked and almost finished the job!



    Cigarette smoke will trip a CO sensor if it is very thick. It will also have the effect of "poisoning" the sensor so that it will take hours to restabilize.



    Hopefully this is enough information for you and I hope that you are safe. If you require more specific information or have further questions regarding CO and smoke detectors, please flag me. Thank you for using FixYa.

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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

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I have a nighthawk carbon monoxide alarm which is showing nan error code. Please can you tell me what to do to rectify it? Thank you.


You can unplug the unit if it's an AC detector, change the battery for a new one and reset the Carbon Monoxide Detector. If that doen't work, you can have it checked by your local fire department. If the unit is more than 5 years old, it absolutely needs to be replaced.

Whenever in doubt about the efficiency of a carbon monoxide detector, a replacement is recommended. Yes, protection has a price, but a life cannot be replaced.

Read more industry information, buy your next Carbon Monoxide Detector here.

Aug 06, 2010 | Kidde Nighthawk Combo Gas/co Detector

1 Answer

Good Morning, My nighthawk CO detector went off with a loud continuous alarm this morning while all were sleeping. I reset it and it is not alarming now. I pushed the peak button and it reads 19. The...


When a carbon monoxide detector sends an alarm, there is cause for concern. You mentioned that the other CO detector did not go off, but maybe it is too far away to monitor the carbon monoxide levels that was in this area.

The instructions in your manual would direct you to evacuate the house immediately and ventilate. Your next step is to get a professional to inspect what may have caused the carbon monoxide leak.

A reading of 19 indicates that there is carbon monoxide in that area of your house, unless your CO detector is not working properly. Your local fire department will give you the best advice for what action to take when a carbon monoxide detector sends an alarm.

Be safe, don't assume a carbon monoxide alarm is cause by a defective CO detector, have it inspected.

Jul 30, 2010 | Kidde Nighthawk Combo Gas/co Detector

1 Answer

My nighthawk carbon monoxide alaram is keep biping


Check your user manual for issues dealing with beeping alarms.

Your local fire department may be able to help educate you on the proper installation and use of Carbon Monoxide Detectors. A CO detector alarm should be taken seriously and you should follow the manufacturer procedures included in the package.

NEVER dismiss a Carbon Monoxide Detector Alarm for a malfunction.
ALWAYS treat an alarm as an emergency and follow manufacturer procedures.

Check our website for more industry information or for buying replacement Carbon Monoxide Detectors.

Jul 16, 2010 | Kidde Nighthawk Combo Gas/co Detector

1 Answer

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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1 Answer

My carbon monoxide detector keeps beeping in spite of replacing thebattery and gives an error code of E09. Also it keeps flashing an err on the led redout. I placed it outside and it is still doing it...


Hopefully you have found a solution for your Carbon Monoxide Detector issue of October 4, 2009. The best solution for a questionable CO dectector is a replacement.

A Carbon Monoxide Detector is the only thing that will read, detect and sound an alert when reads dangerous levels of CO levels in your house. A defective carbon monoxide detector will give you and your family a false sense of security and will give you no protection.

Whenever in doubt, always err on the safe side and replace Carbon Monoxide Dectectors, your life depends on it.

View my website for related information and compare brands and models of Carbon Monoxide Detectors available for sale online.

Oct 04, 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...

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Lost manual for the nighthawk carbon monoxide detector, model no.900-0082-00 made in 11/1996. hasnt been used for several years.DON'T KNOW HOW TO SET IT.


Hold on!

All carbon monoxide detectors have to be replaced after 5 years of manufacture date. The sensors are not reliable after that time and may give false readings.

A carbon monoxide detector is your only defense against the hazards of Carbon Monoxide Poisoning. I would never recommend installing a used Detector. Ask your local fire department for more professional advice on how and where you should install carbon monoxide detectors.

Visit my website for more information. Buy your next Carbon Monoxide Detector here.

Aug 13, 2009 | Kidde Low-Profile Digital AC Wire-In...

1 Answer

Carbon monoxide is on


When a Carbon Monoxide Detector alarm goes off, you should follow the procedures that came with the manufacturer manual. Even when the alarm sounds, you cannot smell, taste, or see this dangerous silent killer known as Carbon Monoxide.

Have your house checked by your local fire department for possible levels of CO gas readings. If this all checks out, you can go online to Kidde Nighthawk website and find the manual for your Carbon Monoxide detector model.

Hopefully, you found your solution since you posted this question back in Dec, 2008. Go to my website to read industry information and to view most Brands and Models of Carbon Monoxide Detectors.

Dec 16, 2008 | Kidde Nighthawk Combo Gas/co Detector

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