I own a natural gas Geil 16F reduction kiln which I’ve been firing on the same program for years. During the past 5 or so firings, the left front quadrant was slowly oxidizing after each firing. Thinking it might be the burners I cleaned all of them, loaded my kiln as usual, set the same program and found that the kiln shut itself off at about 1900 degrees - twice .
My kiln is enclosed in a shed designed to keep wind out, my stack has no variables and Im pretty sure the thermocouples haven’t died. Can anyone help me here?