Question about Kidde Nighthawk Combo Gas/co Detector

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Gas alarm keeps going off. No smell of natural gas in the house. It has happened 3 times before in the last month. It then shows number 210. What does this mean?

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  • 36 Answers

Depending where it was installed your sensor in the unit may be dirty. Try to vacume or blow air into the sensor this may help. If it dosen't toss it and buy a new one. please check your instructions carefully as to where it should be installed.

Posted on Sep 06, 2009

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Posted on Jan 02, 2017

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Why does my Kozy World natural gas wall heater set off fire alarm system?


Most new heaters give off a smell or some light smoke which needs to be burnt off the first time it is used it may smoke , this may be why your alarm is going off , run it with a window open to remove smell etc .

Feb 12, 2013 | Heating & Cooling

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We get a horrible smell occasionally with our Rinnai Avenger 25 nat.gas heater when alight. The filters are clean & was serivced last winter. It was making the smell at times even after the service. It...


From what you have described, it sounds like a case of delayed ignition or as the Owner's Manual calls it a "Combustion Control Fault"or "Incomplete Combustion". This can be caused by several things: A change in the gas pressure; dirty or clogged burner, electronic fault in the combustion controls.

Despite having it cleaned an services last Winter, 12 months have elapsed, with the unit just sitting and collecting dust and spiders. Portable Heating units should be serviced annually. Usually in the early Fall, before firing it up for the heating season.

Hope this helped you ... Cheers.

Jul 06, 2011 | Rinnai RHFE-1004FA 38,400 BTU Energy Saver...

1 Answer

I have two Mr. Heater 20,000 BTU natural gas units. The first unit was purchased last Christmas and installed in February and works well. Very little smell, etc. The second unit (Model MHVFB20TB...


it is possible that the units are different gas in use
one is LPG and the other is natural gas
A mistake from the suppliers warehouse
as gas is a very dangerous product , I strongly suggest that you get in an accredited gas fitter to properly diagnose the problem for your family safety

Oct 11, 2017 | Mr. Heater H25N

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My combination CO/GAS detector keeps sounding the alarm. It happened 1 week ago and I reset it. It went off one more time immediately after it was reset. I smelled no gas anywhere in the house so I assumed...


If the display shows "Lb", the battery is probably low; replace it. Make sure you are buying brand-name batteries, EverReady, DuraCell, etc. not some cheap knock-off brand you may never have heard of. There is absolutely no quality control or minimum performance specifications for batteries that are marketed in the US and there is some REAL trash out there. If the display shows "Err", push and hold the Peak Level button. Does the display change to "E09"? If so, then you have just been "had" by the grossly under-documented "planned obsolescence feature" called, rather matter-of-factly, "End of Life". This means that ~7 years after first being powered up, the unit will, BY DESIGN, cease to function, forcing you to buy a replacement. Would have been nice of Kidde to include THAT warning on the OUTSIDE of the package. Call their "Hotline" at 1-800-880-6788 and tell them what you think of that policy. If it is still under warranty (5 or 7 years depending on date of manufacture) they should replace it. In any event, buy another one; if they replace your first one you will have twice the protection. Not a bad thing. *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

Dec 09, 2010 | Kidde Nighthawk Combo Gas/co Detector

2 Answers

When I come to a stop the cabin fills up with fumes that smell just like natural gas. This happens 100% of the time and is very strong at times. Any suggestions?


Your vehicle is brand new and that is your exhaust converter
It will eventually go away. If you go up hills,it gets real bad, as it heats up more.
If it continues for 6 months, have the dealer check it out,under warrantee

Nov 29, 2010 | 2011 Chevrolet Traverse

1 Answer

In the last month car has had three occurances where it runs rough and rumbles. When it happens the car smells like maybe something burning or rotten egg. The temp gauge has been fluctuating at 150,...


Is it a sweet smell or a burnt oil smell? If you are having fluctuation water temps then I would look into the cooling system. That would not explain running rough though. Check your plugs, wires coil pack and fuel pressure.

Nov 20, 2010 | 2002 Chevrolet TrailBlazer

1 Answer

Just purchased house one month ago. Alarm went off, but stopped when reset button was pushed. House is only 5years old. Should we call 911? No symptoms, furnace off.


if it went off intermittantly ..as beep beep beep every few seconds then it just needs a new backup battery ...if it was a steady alarm then there are things that can cause it to go off .. like pulling the car into an attached garage .. or running an attic or ventalation fan that can draw fumes back out of your furnace or hot water heater.(if gas). if you reset it and the problem is still there then it will just trigger again and again as long as the problem is still there.. so when you reset it and it stayed off thats a good sign ... cooking in the oven can produce sparks as spattered grease hits a burner. that will often set it off ... if you unplug the unit or if you have a power failure the unit may go off under battery power to warn you that its not powered .properly ... if it triggers and comes back on after a reset then it would be a good idea to ventilate the area .. open windows and doors ... until you can locate what triggered it ... you can call the gas company. you usually can smell natural gas easily .. but you cant smell carbon monoxide.(they can test for both). CO is only generated when something is burning without complete combustion .. a burning fire place with the flue set improperly will set if off .... if the sink drains havent been used for a long time ..then the traps can dry out .. water in the trap is what keeps sewer gasses out of your house ... just running water in each drain once in a while will keep that from happening ... if they dry out then sewer gas will set off your detector (thats all the drains)...if the hot water tank has been turned on but not used for a long time then hydrogen gas is produced in the tank ..thats the sputtering sound you hear when the hot water is first turned on ... hydrogen is flamable but othewise not dangerous and not usualy a problem . just run hot water for awhile to clear the system of that gas ...that gas can set off the detector and you cant smell it . so if you get a lot of sputtering then open wiindows while purging the gas.to prevent a trigger .it will likely take a few days of normal use to completely eliminate the gas but the volume should drop to low enough levels to not trip the detector in an hour or so

.. so on a new house do the following: :
1. purge the hot water tank of hydrogen gas (sputter)
2. dont use ventilation (attic) fans without opening air intakes (windows)
3. make sure chimneys are not blocked (bird nest)
4. make sure all drains are filled with water (trap)
5. dont run car in attached garage longer than needed .. make sure there is no cold air retturn in a heated garage .
6. expect triggers when broiling (move detector to another room or open windows when broiling)
.7. understand the operation of the damper before using the fire place

hopefully one of these things was your culpret and you can rest easy...

Apr 11, 2010 | Kidde Nighthawk Combo Gas/co Detector

12 Answers

Ventless gas heater smells like kerosene


It is posible that your heater is burning fumes from paint, varnish or stain and some times carpet cleaners or other household cleaners. I work for a utility company. We get called to homes for a lighter fluid/kerosene smell quit often. Most of the time it is from the fumes burning off on a standing pilot gas oven. The odor collects in the oven and is released in the customers face when they open the oven door. This will happen with any open flame appliance when exposed to these fumes.

Feb 05, 2009 | Procom 10K BTU, Vent Free, 2 Plaque...

1 Answer

Alarm keeps beeping, reads 0


Try testing it first. Press the test/reset button. If it's operating properly on the display:
"GAS" - and it should beep 3 times. Then a number should appear on the display. It should be arround 200. Then it should beep 4 quick times, then nothing for 5 seconds, then 4 quick beeps that keep repeating. It will then show 3 numbers again for a few seconds. When they're gone it will be done resetting. It should show a flashing red light and a 0 or whatever the reading might be. Try this and let me know what happens. If this fixes the problem please rate as fixed. If not, please don't rate yet. Let me know what's going on and I'll be more than happy to help. Thanks.

Apr 15, 2008 | Kidde Nighthawk Combo Gas/co Detector

2 Answers

Dryer smells of natural gas


Of course, this applies to gas dryers only. If you smell natural gas near your gas dryer, do not light matches or a lighter and don't operate electrical switches or anything that might spark, igniting an explosion. Immediately shut off the gas valve that serves the dryer. If the smell is mild, ventilate the area, wait until the air is clear, and re-light your pilot light. If the smell is strong, move everyone outside, leaving the doors open to ventilate the house. Turn off the gas supply valve --located by the gas meter on the gas inlet pipe-- by rotating the valve one quarter turn with an adjustable wrench. The valve's oblong stem should be perpendicular (at a right angle) to the inlet pipe to stop the flow of gas. Call your gas supplier (or the fire department) from a neighbor's phone or a cellular phone outside the house.

Jan 18, 2006 | AEG T57800 Electric Dryer

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