At the very least you have a partially or fully plugged up heat exchanger, and at the worst the secondary is also in the beginning stages of plugging.
The yellow flame means there is not enough combustion air mixing with the fuel to burn correctly. Yellow flame equals excess carbon which is what is plugging up the heat exchanger blocking yet more airflow creating more and more excess carbon. Left unchecked this thing will plug totally or hopefully open the pressure differential switch and shut the system down and lock it out.
You must get a qualified service tech on this issue as soon as you can, it may not be too late to have a reasonable repair cost...but trying to operate it much longer and you can kiss goodbye just about any money the high efficiency has saved you for the last couple of years !!!!!!
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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