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I have a Gibson gas furnace model gl1ra072c12a, the middle two burners flame are blue both end burners are yellow . All were cleaned. as well as jets what could be the problem?

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If the flames are yellow AND lazy, not acting like the two blue flames are, the problem sounds like excess carbon build up within the heat exchanger ABOVE the two yellow burning burners. If that is the case, the yellow burning flames are contributing additionally to the carbon already in there. Eventually, the lazy flames will roll out into the furnace vistibule and possibly burn wiring creating a major problem. There are looooong wire handled bristle brushes 30" long that must be used to thoroughly clean the heat exchanger after the burners have been removed. A shop vac will help greatly in reducing the nasty carbon mess.

Usually, the vent collector hood and flue is removed to brush down from the top and up from the bottom alternately. If there are air shutters on the burners, make sure they haven't been throttled too far down limiting the combustion air causing the original problem.

You need a certified HVAC service tech to look at this issue.

Posted on Dec 10, 2014

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Posted on Jan 02, 2017

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  • 41 Answers

SOURCE: yellow pilot on heater

Best Solution posted on May 06, 2008 4%20stars.png
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soleman13au
Rank:master_s.gif Master
Rating: 90%, 19 votes
Hi mitalee1
All it needs is a good blow out with compressed air. They tend to carbon up in the pilot light area. You will probably also find it is very dusty inside. Easiest way to clean the carbon out is to remove the hose at the heater and with compressed air blow through the fitting where you have removed the hose. Make sure you hold down the start button so the air can get through to the pilot light and jets. Don't connect the electricity for the fan when you do this. If you can get to the top of the pilot light it may help to give that a blow out too.
To clean it out internally you only need to remove the front panelling. Just follow the screw configurations *** you go. I asm not familiar with that type of heater so thats about the best I can do. Regards Bryan

Posted on May 07, 2008

  • 9 Answers

SOURCE: furnace flame goes low fan stays on

if the gas pressure is good on inlet and outlet of valve u might wanna chk the burner trays and manifold for flakes, dirt, spider webs ect... once u kno the passages are clear from obstruction you can focus on the mechanical. (sounds like gas valve may be getting weak and not able to open fully)

Posted on Mar 22, 2009

  • 189 Answers

SOURCE: Burner flame going out on windy days on Coleman Evcon LP furnace

This sounds like a bad heat exchanger. It is possible that you do not see the crack because the crack is closed when the heat exchanger is cold (or room temp). Allow the furnace to heat up, this will allow the expansion of the crack. Turn the power off and examine the heat exchanger while it is still hot.

Posted on Apr 10, 2009

co7196
  • 3433 Answers

SOURCE: I have a Goodman GMPN120-5 furnace that has flame

I hope this helps you_Ned

http://www.fsti.com/rollout.htmd

Explains flame roll out. :)

Posted on Oct 07, 2009

  • 221 Answers

SOURCE: furnace howls when burner lights for 30 or so

Hi, the howling you describe is pretty common as gas heaters first come on. NG or LP gas is delivered at a pressure much higher than appliances actually use, step down regulators lower the pressure as the gas flows. So, when you first turn your heater on, the pressure is a little high until the flow causes an equalization of pressure. You could contact your gas supplier and ask them to check your pressure and tell them you suspect a building regulator. If the pressure were to build too high it could cause leaks or damage the appliance controls.  Good luck.

Posted on Jan 10, 2010

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Depending on the age of the unit the gas pressures should be fine. The first thing I would do is to give the burners a thorough cleaning and make sure pilot is clean if so equipped. I would shut furnace off and remove the burners for easier and better cleaning. Use a wire brush to lightly clean openings on the burners,and gently tap inlet end of burners on soft wood block or thick cardboard pad to clean soot and rust from inside the burners. Also blow out with air if you can.
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This applies to stoves, oven, furnaces, water heaters

I did a google search for: clean burners on gas stove.
There was more information and helpful tips on those links than I can honestly repeat here, including how-to videos.

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, fixya expert speaks with you over phone while you work on appliance.

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Lighting the pilot light


The steps involved can vary slightly depending on your furnace model and pilot valve type, so if possible try and find the instructions inside the furnace door cover or in the instruction manual. This is for a gas fired furnace, but applies to any gas-fueled appliance including water heater. Two of the most common types of pilot valve body assemblies either have a red reset button and a gas valve or no reset button and a valve knob that can be depressed. But whichever type you've got, if you have an older model furnace with a standing pilot (flame is lit all the time) then this is the basic procedure.
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  • Place the lit match or ignited lighter tip at the pilot and depress and hold the button or depress the knob as appropriate. Depress the button or knob for about 30 seconds. This maintains gas flow to the pilot until the thermocouple gets hot enough to open the main gas valve.
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  • If the burners fail to ignite then it may be because the thermocouple did not get hot enough to open the gas valve. Wait a few minutes and then repeat the above procedure. This time hold the red reset button or depress the knob for about 45-60 seconds.
  • Once the main furnace burners ignite, adjust the thermostat to the desired setting.
  • If you've followed the previous steps on lighting the pilot and it still does not light after, or will not stay lit, then you probably have a problem with the thermocouple or an adjustment needs to be made to the pilot. You'll need a furnace service technician to replace or repair these parts. You may find that the pilot lights, but it is an anemic looking flame. That's a different problem we'll look at in the next section.
  • If the pilot lights but the flame is a weak yellow flame, it will not get hot enough to heat the thermocouple to its set point allowing the gas valve to open.
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