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  • 4 Signs Your Faulty Boiler Could be Dangerous

    Jan 28, 2016 · As the boiler could not draw fresh air to burn and draft up the chimney, the boiler started burning a wavy yellow flame instead of blue and spilling carbon monoxide into the room. The yellow flame was wavering under the boiler, and the fumes passing up the casing caused sooty marks.Learn More

  • What causes the pilot flame to be yellow instead of blue

    Apr 23, 2012 · I put the gas valve back on the boiler and I had a normal blue flame for about 4 seconds then it went back to large yellow all the while holding the pilot button down of course. I checked all the wire connections andall are tight.Learn More

  • Four warning signs that your boiler could be about to kill

    Nov 29, 2017 · "What's more concerning, however, is a pilot light that goes from being a bright blue or bluish-green with a small yellow spot at the tip to being yellow with a weak-looking flame.Learn More

  • What causes the pilot flame to be yellow instead of blue

    Apr 23, 2012 · I put the gas valve back on the boiler and I had a normal blue flame for about 4 seconds then it went back to large yellow all the while holding the pilot button down of course. I checked all the wire connections andall are tight.Learn More

  • My boiler pilot light is yellow instead of clear blue! - Why?

    Jan 27, 2017 · The pilot light in your boiler should always be a clear, crisp blue colour. A blue flame means the system is running at its most energy efficient. A yellow pilot light, or one that even has a slight tint of orange or yellow, not only means wasted energy, it could also be producing carbon monoxide (CO).Learn More

  • Why does my propane burner burn yellow? - AskingLot.com

    May 19, 2012 · Fired boiler and noticed flames were very yellow and burning very poorly. The burner tubes seemed to be clear, and I didnt suspect an isuue from them because pilot tubing was burning yellow as well. I asssumed gas valve was bad so I changed it. The problem is the exact same. My next thought would be to check the boiler sections for carbon buildup and also check the chimney. Not sure what else I should be looking for. In terms of gas sizing Boilers …Learn More

  • Why would a gas boiler make soot? - Google Groups

    Apr 16, 2011 · So a faulty one of these would cause your boiler to soot up for sure(I think your engineer fixed the problem) Last but not least, if the flame is blue, I doubt you're still sooting. However the boiler more than likely modulates and the flame could be blue at %75 but yellow at %10 so you really need to check the flame in %10 incrementsLearn More

  • What It Means When a Pilot Light Doesn't Burn Blue

    Dec 13, 2015 · But if you have a furnace or boiler that still has a pilot light, you should inspect it a few times during the winter to make sure the pilot light's flame is burning a steady blue. If it isn't, you should call for a repair technician. What the pilot light color meansLearn More

  • Weil Mclain CG Boiler flames to big — Heating Help: The Wall

    Dec 31, 2015 · A few weeks ago I got a slight smell of gas, checked on the boiler, flames were erratic and yellow. Pulled the burners, kinda rusty and the pilot burner bracket was on its last leg so I replaced all the burners. I also found the boiler sooted up from the bad flames so I cleaned it well. Put it back together and the flames are still big and yellow.Learn More

  • My gas fired steam boiler is showing a yellow flame, is

    Jan 02, 2010 · My gas fired steam boiler is showing a yellow flame, is this safe or is it a sign of a problem. When a flame changes colors, it is caused by some form of contamination. That's not nearly as bad as it sounds. For example, if you hold a piece of copper (e.g. a penny) in a flame, it will turn green. It's completely natural.Learn More