The top section of my 3-zone kiln is 200 degrees F hotter than the middle and bottom. I am firing at a FULL rate with the Sentry 12-key controller. Why is there such a large difference in temperature?
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At FULL rate, the zone control system is turned off. This is because the controller assumes that when you program a FULL rate, you want to fire as fast as possible without slowing down the kiln to even out the temperature in 3-zone mode. Fire at a slower rate to turn the zone control back on.
By the way, a difference of 200 degrees F between the zones of a kiln is normal below around 1100 degrees F. As the temperature rises, the heat distribution will become much more even.
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