Question about Kidde Nighthawk Combo Gas/co Detector

2 Answers

Alarm went off

The alarm went off and the digital reading said GAS-then flashed a code: 226. Any idea what that refers to? The gas company came over and got zero redings for explosive gas.

Posted by Peter1515 on

  • 16 more comments 
  • m n Nov 20, 2007

    Keep getting code "216" for gas level!

  • m n Nov 20, 2007

    ALARM keeps going off ... GAS level....
    CODE 216!

    Please tell me what this means!

  • Anonymous Jun 01, 2008

    Our combo gas detector has gone of with readings of 297 or similar from time to time. Also had gas company check for leaks and found no problem. Are there other smells or things that can trigger the gas alarm?

  • Anonymous Jun 04, 2008

    Alarm goes off without any CO or Gas present

  • napmac Aug 04, 2008

    I experienced similar problems. The GAS alarm would go off with a reading in the 214 range, but when I pressed reset, it stopped and went back to 0. I called the gas company and they did not detect ANY gas leak. Since then I have noticed that if I spray any aerosol products in my house, the GAS alarm goes off within 15 minutes, even if the aerosol is 30 feet away. PAM spray in the kitchen, cleaning products in the bathroom, hairspray, air freshener. Apparently it is the aerosol propellant setting it off. 

  • jeffstenger Aug 04, 2008

    I have same problem. alarm goes off, display says "GAS" 227

    this is a false alarm, there is no gas in house. I replaced battery and also plugged in the garage and an outlet outside and GAS alarm still goes off!

  • kayaye33 Sep 23, 2008

    Ours went off tonight with a reading of 220 and keeps going off. The fire dept. came out and tested and said it was fine. It still is going off - I had to take the battery out to get it to stop

  • Anonymous Dec 27, 2008

    My detector is going off. Flashing GAS and numbers like 248 and 242.
    I don't believe there is any gas in the house, but I can't be too sure.

  • Anonymous Jan 18, 2009

    The damn thing goes off every now and then in the 200-280 range for GAS. GAS has distinct odor and none can be detected. The furnace burns hot and bright with the hot water heater.

  • dsracic Feb 08, 2009

    My detector goes off at 247 ... have HAD Gas company here, and had my gas stove/oven checked...nothing can be there anything for me to be concerned about or should I proceed with caution?

  • Anonymous Feb 15, 2009

    Mine has gone off 2 times in the last 4 hrs at 222 ppm. This is crazy am I tired from lack of sleep or is the CO taking me down? From the other posts I am assuming no danger just a common thing.

  • Anonymous Feb 21, 2009

    After I push the reset button, it doesn't alarm but indicates there was gas. It then gives a number in the mid-low 200s. Not sure what the problem is. Is this the level of Co2 that it's detected, as well as the fact that it's detected gas? Or is this the maximum level of gas it detected?

  • Anonymous Mar 04, 2009

    Happened to me. I threw it away thinking it was broken. Bought another one and same thing happened after a number of months. Will buy a different brand this time!

  • Anonymous Mar 10, 2009

    every time i spray any type of aerosol (pam, hairspray, renuzit etc) my alarm goes off, now it didn't stop so I put it inside a ziplock bag and it keeps going off non stop, I'm tired of the thing, good only for a couple months but now I hate it

  • Anonymous Mar 15, 2009

    I had the same thing. Gas alarm went off and then it showed a number of 220. I reset it and it went off again 15 minutes later. After the 3rd time it went off I called the gas company who came out and did not find any gas leaks.

  • Anonymous Apr 14, 2009

    I have had the same problem also. Keeps going off, reads 211, 212 and gas company cannot find any gas or CO. Very annoying. Anybody know of a better CO detector?

  • Anonymous Apr 21, 2009

    Occasionally gas monitor screeches and will read around 240. This usually happens after some sprays or cleaning substances have been used. My question: can these low readings under 300 be ignored, even if you can't determine use of possible causes? If someone has resolved these problems or has a solution other than tossing out my $60.00 Nighthawk combo unit please email me: [email protected]

  • Anonymous May 25, 2009

    My nighthawk first went off in February because of gas although no gas was dettected. its been fine since and then a few nights ago it started going off again reading gas and then a number in the 200s.

    This company should be out of business considering its co and or gas.



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I just had the same problem (second time in about two months this has happened). I went to the manual, as recommended, and they had this helpful bit of information:

Q. What do the numbers mean on the digital display when
I press the “Test/Reset” button?
A. The numbers you see when you press the Test/Reset button
are NOT a CO reading or a Gas alarm. This is a simulated reading
the alarm displays as it tests its electronics. The numbers displayed
when the Test/Reset button is pushed should be between
100 to 400 (usually around 200). These numbers are shown after
the “Gas” test is complete.

Then later, they give another helpful tip...if the system does not work as described, replace it immediately. Good advice. I wonder what manufacturer I'll try this time. Repeated false alarms render these things utterly useless.

Posted on Jun 22, 2009


Jeffrey Pemberton

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You can vheck the Kidde site:,8060,pageId%3D794%26siteId%3D384,00.html

Click on customer service link and you can find manuals if you don't have one. Type in model in upper right and click thr arrow. This will give you a link to your manual. If not found in the manual you can call them. Number is on site.

Posted on Mar 13, 2008


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