Heating Help

glass like soot

What causes soot to turn into a glass like coating?  I've seen it once before and it seemed to be caused by a failed nozzle.  Anyone else seen this happen before, this is only the second time I've seen it and in two different locations.  

Thanks,
Mike

where at?

John, where are you seeing this?  On the burner head/end cone? Or somewhere else?  If you're finding it on the end cone, could be the nozzle assembly it out of adjustment, not letting the proper amount of air get down and through.  You could make sure its at the manufacturers recommendation.  Then start the usual troubleshooting---motor, blower wheel, pump coupling all working properly, then complete combustion testing.  Also make sure the nozzle wasn't changed to a different type, size shape, from the correct one.

glass like soot

sounds like creosote to me.  Low pump pressure or poorly atomizing of the oil whether it be too much air, bad nozzle, too small nozzle, lack of chamber or lining just to start with. Have fun scraping that stuff off, and post some equipment brand /type /test results