Question about Kidde Nighthawk Combo Gas/co Detector

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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.

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Re: 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.

Posted on Jun 22, 2009

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Re: Alarm went off

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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I have model 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

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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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...

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?

Nov 10, 2010 | Kidde Nighthawk Combo Gas/co Detector

1 Answer

Code 266 and 263, alarm sounding

This is urgent to check immediately - From what I can tell in the manual you are having high levels of CO detected. This is the parts per million reading in your home. See page 6-3 in manual - this the link - -

On page 4-2 it says:
If the alarm sounds for carbon monoxide:
1) Operate test/reset button;
2) Call your emergency services ( fire dept. or 911);
3) Immediately move to fresh air - outdoors or by an open
door/window. Do a head count to check that all persons are accounted for. Do not reenter the premises nor
move away from the open door/window until the emergency services responders have arrived, the premises
have been aired out, and your CO and Gas alarm remains in its normal condition.
4) After following steps 1-3, if your alarm reactivates within a 24 hour period, repeat steps 1-3 and call a qualified
technician to investigate for sources of CO from fuel burning equipment and appliances, and inspect for
proper operation of this equipment. If
problems are identified during this inspection
have the equipment serviced immediately.
Note any combustion equipment not inspected by the technician and consult the manufacturer's instructions,
or contact the manufacturer's directly, for more information about CO safety and this equipment. Make sure
that motor vehicles are not, and have not been, operating in an attached garage or adjacent to the residence.
Actuation of your CO and Gas alarm indicates the presence of
Carbon Monoxide (CO) or explosive Gas which can KILL YOU.
When the CO and Gas alarm senses a dangerous level of CO, the unit will emit a loud alarm pattern and display the concentration
of CO in parts per million (PPM). The alarm pattern is 4 short beeps - followed by 5 seconds of silence - followed by 4 short
beeps repeating. (Note: When the unit is disconnected from the 120V power supply and is on battery backup, the alarm pattern will
continue for the first 4 minutes after detecting CO and then the cycle will repeat every one minute). Know how to respond to a CO
or Gas emergency. Periodically review this user's guide and discuss with all members of your family.

Oct 03, 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

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

Error code with a beeping-- reading 172 flashes

Call Kidde during business hours at the following number. I took the next paragraph off their website.
"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 18, 2009 | 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.

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I have been following your case for a while now and start to think that you should switch to another alarm company, I mean if they can't fix such a simple problem with a tech (!?!?) to me, as an alarm installer, it is unacceptable!, in Canada we had the same problem and did the change and life went on..sorry for my typo mistakes it is because i have a french accident (i am from Quebec, Canada).


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