I bought a used genesis three burner. The outside burners burn with a nice blue flame, but the center burner burns tall and yellow. The center burner has been replaced, as it looks much newer than the outside burners. I purchased a new burner set, but I am not sure the burner is the problem. The center burner holes were on the bottom, so I turned it over so the holes were on top, and that didn't help. I tried adjusting the air intakes, and that made little difference. I suspect the previous owner had this problem and tried to fix it by replacing the middle burner. This apparently didn't fix it, so he gave it to the Salvation Army where I bought it. What should I do next? Do need a new manifold? Can a fix the center valve?
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Re: middle burner looks ok but has huge yellow flame
Sounds to me like the new burner that was put on, has the wrong gas orifice in it. Possibly a nat gas orifice instead of a propane orifice. If it's a propane grill, take it to your local propane co and have them look at it. Also, sometimes just a spiderweb or dirt dobber nest in the burner's venturi tube can cause that kind of problem. Blow it out with an air compressor and see if that's 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.
Look at the left burner, pipe,air hole adjustment,etc because it is operating good.
You will see a difference to it compared to the on the right.
The right pipe, air hole, or the length the pipe that are iserted in the gas control valve is different from the left.
The yellow flame indicates that not enough air is getting to the flame getting to the right flame ignition point.
The left flame is nice and blue...normal, the right is yellow indicating that not enough air is getting to the flame ignition point...look to see if the air hole adjustment is different than the one on the left...there is something open more or less, improperly adjusted.
Once you have it adjusted properly the right flame will burn bright blue just as it does on the left.
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The burner flame should be blue. If you have the spider air flow open to wide the flames will be yellow. This means the gas flow has to much oxygen.
Typically the air vent should nearly closed. You may not be able to remove all the yellow and have a few Yellow tips. This is ok, just try to adjust were you have the last amount of yellow in the flames.
Okay, what you are dealing with is called "vapor-lock". The way these grills need to be turned off is, close the tank valve first and after the burners go out, then turn the burners off. The way you are doing it is trapping the gas and you are getting a weak flame. Fortunately this is an easy fix. First, light the grill by turning the gas valve open, then turn the burners on to light the grill...as soon as that is done, close the gas valve on the tank then turn the burners off. Repeat this procedure until you get a good flame. If this procedure hasn't fixed the problem after the third time, you need a new regulator and regulators are easy to find in any home improvement store like Lowe's or Home Depot.