Question about Kidde Nighthawk Combo Gas/co Detector

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I have a Kidde combo CO / Gas monitor. The last two mornings at almost the same time (7:00 AM) the alarm sounded with the word GAS displayed. The condition went away in about 30 seconds each time and the alarm was no longer present. The alarm was just recently moved into the bathroom. It had never gone off in its orginal location, the living room.

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Besides the obvious jokes about gas in the bathroom, I would advise you move it out of the bath room. It is being affected by excessive moisture causing errors in the sensors. The same can happen for smoke alarms with condensation or other moisture sources. It should be located relatively close to a possible source of problem, but not right on top of it.

Is the shower in use at around 7 am every AM?

Posted on Nov 10, 2010


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I have kidde night hawk carbon alarm what does the numbers 888 mean

When you first power up the unit, you should see three eights (888) on the digital display, indicating the alarm is in the start-up mode and is warming up. The three eights will remain for approximately 20 seconds.

Aug 02, 2012 | Kidde Nighthawk Combo Gas/co Detector

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My kidde carbon alarm chirp every 30 seconds and shows L6 on the dispaly, also the red light goes off and on

"L6" display & chirping sound, indicates you need to change the 9 volt battery in the detector.

If you have misplaced your User Guide, I have included a link to it, that you can download and print for future reference.

Hope this helps you solve your alarming situation. :)

Mar 02, 2011 | Kidde Nighthawk Combo Gas/co Detector

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Gas alarm on Nighthawke combo has gone off with error code 229

According to the Kidde Company. If any Error Code appears on the screen and that Code is not listed in the Owners Manual, you should return the unit to Kidde for repair or replacement. However, you must contact them first and have your Proof of Purchase available.

Hope this helps you.

Feb 18, 2011 | Kidde Nighthawk Combo Gas/co Detector

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Kidde nighthawk carbon monoxide detector started beeping every 30 sec.pressed reset button on front beeping continued louder, put unit ouside in fresh air for few secs beeping stopped. I opened the...

Golding93, you could very well have elevated levels of CO in your home. You should leave your house immediately and call the fire department. However, if your CO alarm is 7 years old, it could also be the alarm's end-of-life warning. Regardless, you should definitely call the fire department to have everything checked out. If you need additional assistance with your CO alarm, please call our customer service line at 1-800-880-6788. Thanks for being a Kidde customer. We appreciate your business!

Crystal Robinson
PR Coordinator

Dec 20, 2010 | Kidde Nighthawk Combo Gas/co Detector

1 Answer

What does code 222 and 224 mean on the kidde nighthawk combo gas/co detector?


was there also an alarm with that reading? Normally it would suggest gas leak.

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Apr 03, 2010 | Kidde Nighthawk Combo Gas/co Detector

1 Answer

Manual for Co/Gas combo - the gas meter went off on Thanksgiving, showing 217, but we open all the windows and could not find gas leak anywhere. Today- doesn't even show 0

Hmm, it seems like a lot of us are having problems. My Kidde CO dectector is less than a year old and it's already showing an error. Call Kidde at the following number, Mon-Fri, 8am-5pm, EST.
"The next time your carbon monoxide alarm has ERR on the display, push and hold the Peak Level button.You will see an E and an O followed by a number.Contact our hotline at 1-800-880-6788 and provide us the error code, along with the model number, assembly number and date of manufacture from the back of your unit.If your unit is under warranty, a replacement will be mailed to you."

Nov 27, 2009 | Kidde Nighthawk Combo Gas/co Detector

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

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

1 Answer

Gas code 210

Does the co alarm sound and display show 210? This means you have 210ppm co. This is not good. Are both the gas and co alarms goig off? Try resetting but if it's working properly you've got a pronlem. Check this link for further info:

Mar 12, 2008 | Kidde Nighthawk Combo Gas/co Detector

2 Answers

Alarm went off

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.

Oct 17, 2007 | Kidde Nighthawk Combo Gas/co Detector

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