Question about Air Conditioners

1 Answer

The furnace burners won't stay lit

The furnace ignites, the burners light and then they turn off after about 10 seconds. The process repeats. What can we do to get the burners to stay lit?

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert who has answered 20 questions.


    An expert that hasĀ over 10 points.


    An expert whose answer gotĀ voted for 2 times.

  • Contributor
  • 25 Answers
Re: The furnace burners won't stay lit

Could be a couple things. First and easiest is to check your intake combustion air supply. If it is blocked by anything or just not enough flow, it will put out the flame. Next would be the flame sensor, usually a temperature probe near the flame front. If it's not reading an increase in temp within a pre-programmed time, it will kill the flame. It can be checked with a multimeter.

Good luck!

Posted on Jan 25, 2008

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer

Burners kick on for 10 seconds then kicks off will keep repeating this

Hello, sounds like the flame sensor needs to be cleaned with steel wool. The flame sensor is a metal rod located on the opposite side of the igniter that senses the burner flame and will keep the Furnace running, what happens is the rod builds up oxidation and then cannot sense the burner flame and will shut the burners down and keep repeating. Just remove the sensor and clean with steel wool and reinstall.

Dec 08, 2011 | Weather King 10AJA3001AH Air Conditioner

1 Answer

America standard freedom 90 furnace. when the thermostat call for heat the ignitor glows then burner lights but only stays on for 1-2 seconds if i shut off the furnace power for a few minutes then turn...


Check the flame sensor and/or the grounding from the burner ot the ignition is not sensing the flame...

Here is a tip that will help you try to figure out why your furnace is not working.

Basic Furnace or Heating System Troubleshooting


Feb 25, 2011 | Air Conditioners

1 Answer

The furnace will light up and the fan will blow but the flames cut out before my house reaches temp. i have the thermostat set at 70 and the house will not get above 55. i have tried turning the propane...

First, for those of you who might not know, "What is a flame sensor?" A flame sensor is a safety device. When your furnace's main burners ignite (light Up) the flame sensor picks up the heat from the furnace's main burning and says, "YES," and sends a signal back to the main furnace control board saying that it is OK to let the main burner stay on. Or if the main burners do not ignite, the flame sensor does not pick up the heat and says, "NO" to the main control board, Shut That Gas Valve and Main Burners Down! Thank God we have safety controls like the flame sensor. Most of the time, after turning your furnace's power off, you may clean the flame sensors with light sand cloth, emery cloth or steel wool. Reinstall the flame sensor and you are back in business! Over the years flame sensors can build up a light coating of burned-in dust and dirt. This insulates the flame sensor so that it doesn't sense the heat of the flame well enough, so by cleaning it you have almost restored it to its new condition. Seldom, but sometimes they do go out completely.

Dec 08, 2010 | Coleman Air Conditioners

1 Answer

Hello, I have a Amana Air Command 80 model #GHI90A50, 22 years old. This furnace is on its third ingnition module (last one two yeras ago). The symptom I am trying to diagnose has been ongioing since this...

If your furnace lights and the gas stays on for 8 to 10 seconds, then shuts right back off, then you need to clean your flame sensor with light sand paper or steel wool. You might need a new flame sensor, but most of the time they can be cleaned an will work well after cleaning.

Dec 05, 2010 | Air Conditioners

1 Answer

Air pro gas furnace model #g8c07512mub11a The combustion fan comes on the igniter glows red the gas fires in the burners for 5 seconds the it shuts down. Any suggestions would be helpful.

I would suggest you change the flame sensor. It will be a small diameter probe extending into burner compartment,usually over or inbetween burners. If your furnace is lighting the burners but they won't stay lit That Is what I would do first.. I also would turn thermostat to fan on to make sure you don't have a problem with the fan. Hope this helps you. Thanks

Nov 17, 2010 | Air Conditioners

2 Answers

Ruud Silhouette II Fails to Ignite

sounds like you have bad flame sensor or the sensor is in a bad postition. To get eliminate the lockout turn the power off to the unit and back on again. Look at the circuit board light and see what the troubleshooting code is.

Jan 13, 2009 | Air Conditioners

1 Answer

Rheem gas furnace pilot lights, but no burners or fan

If the burners do not fully ignite, the sensor will shut the furnace down. The lack of sufficient burner flame is a gas valve or gas pressure problem within the valve.
Replacing the gas valve with the original one may get you going. I surely suggest a professional service company for safety reasons and a thorough inspection. A 20 year old furnace is past it's normal life span.

Jan 06, 2009 | Air Conditioners

1 Answer

Rheem Furnace sometimes takes a couple of ignition cycles before

Try cleaning the flame sensor. It is located right besides the last burner. Looks like a thick piece of wire. Take steel wool and gently remove the carbon that has built up. Should only take 4 or 5 strokes. Let me know how it goes after that. ken

Dec 23, 2008 | Air Conditioners

1 Answer

The burners go out before the fan comes on

Replace your flame sensor, but before you do that, see if you can clean it with light wool, or emery cloth, or light sand paper. It's a metal rod that points in the current of your flame.

Dec 05, 2008 | Air Conditioners

Not finding what you are looking for?
Air Conditioners Logo

Related Topics:

2,774 people viewed this question

Ask a Question

Usually answered in minutes!

Top Air Conditioners Experts

Mike Butler
Mike Butler

Level 3 Expert

6674 Answers


Level 3 Expert

1033 Answers

Dan Webster
Dan Webster

Level 3 Expert

8147 Answers

Are you an Air Conditioner Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides