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Furnace flame has alot of yellow - Air Conditioners

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Yellow flame is an indication of poor air flow into or out of the unit/burners and can result in dangerous combustion gases forming - the safe thing to do is turn the unit off and call your gas supplier to evaluate the safety of the unit

Posted on May 03, 2008

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12 year old HE York diamond 90 furnace burners ignite for a few seconds but won't remain lit. Hot surface igniter then glows and burners again light momentarily. Cycle repeats several times before blo


The flame sensor can still be faulty, replacing that is the cheapest. Other issues could be a faulty control board (if available), a faulty gas valve, thermostat lossing call, or a safety/pressure switch problem. There are alot of variables and it really helps to have a meter to check voltage and continuity through-out the system.

Dec 07, 2013 | Air Conditioners

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Why heater coils glow?


It sounds like you're describing one of two things. The hot surface ignitor in a gas-fired furnace, or the resistive heat strips in an electric furnace.

The hot surface ignitor in a gas-fired furnace lights the burners. This ignitor in modern furnaces serves the same purpose as the standing pilot flame did in older furnaces. It provides the required heat to ignite the gas at the burners. Without an ignition source, a gas-fired furnace cannot provide heat. When the ignitor is activated it will glow bright orange or yellow.

The resistive heat strips in an electric furnace actually provide the heat to a home or building. When the furnace turns on, the heat strips are activated and usually glow orange when they reach peak temperature. In almost all cases, the heat strips are not easily seen or accessed without removing covers or panels inside the furnace.

Feb 28, 2011 | Air Conditioners

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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

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OUR FURNACE IS DGAA077BDT AND IT IS PROPANE WITH ELECTRIC . IT WON'T STAY LIT. WE TURN IT ON. WE SEE THE YELLOW AND BLUE FLAMES AND THEN IT SHUTS OFF AND ONLY THE FAN WORKS. WHATS WRONG WITH IT?


sounds like a bad flame sensor try cleaning or replace if necessary it looks like a small metal tube on the side of the burner with 1 wire going to it .

Nov 16, 2010 | Coleman Air Conditioners

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Flame sensor oxidation problem?????


make sure you have good contact at ignition control module. if wire comes off easy crimp wire terminal with pliers until its hard to pull off. also make sure green ground wire is tight. make sure sensor is with in 1/8 in of flame. If unit is being used alot your doing the correct thing by cleaning.

Jan 24, 2010 | Air Conditioners

1 Answer

Intertherm propane furnace makes popping sound when running


It sounds like you have a possible hole in the heat exchanger. Turn the heat off and turn the fan on. If you feel any air coming back out of the heat exchanger, you have a hole. A yellow flame is not a good sign. I would even consider having a service professional come out and take a look.

Apr 05, 2009 | Intertherm P3RA-048K Air Conditioner

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Furnace shutting off


Thanks for you question,
It will be one of two things, either you have a bad flame sensor, or a bad pressure switch, , the flame sensor is located infront of the burners, its a little rod that the flame impinges on when its lit, you may need to take it out, and clean it, use some emery cloth to clean it then reinstall it, give it a try and if your furance runs, then great, your pressure switch isnt to bad either, you will see one or two small pieces of tubing coming out of it, two possible three wires on the front of it, remove the switch, and take it to your local heating and a/c shop to get a replacement, there is no working on these, hopefully its the flame sensor, alot less trouble ! Hope that was helpful, thanks again for your question, please let us know how we did,
mr.grzz

Jan 21, 2009 | Air Conditioners

1 Answer

Weak flame in intertherm furnace


Ok, so we can rule out the ignitor. (standing pilot systems can develop problems that will cause such symptoms.)

Check the gas pressure, make sure you are getting 11 to 14 PSI.

You need that after the regulator all the way to the manifold.

Also check for cracks in the heat exchanger, causing the wind from the blower to distort the flame pattern enough to cause improper contact with the flame sensor.

Make sure the burners and flame channels are clean of rust, and dibri build up, allowing the flame to properly contact the sensors.

Jan 18, 2009 | Intertherm P3RA-048K Air Conditioner

1 Answer

The burners go out before the fan starts


Replace the flame sensor, clean the burners to ensure you have a good clean burn pattern and the flame is properly reaching the flame sensor.

Look for a flashing LED and determine what the failure code is.

Dec 05, 2008 | Air Conditioners

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