I don’t have a kiln wiring diagram. How important is it?
A kiln's wiring diagram is invaluable when you are having electrical problems with the kiln. It takes little skill to compare the kiln's wiring to the diagram.
Unplug the kiln. Remove the screws fastening the switch box to the kiln. With the help of the diagram, identify each electrical device in the switch box. You will find, on a digital kiln, a transformer, relay(s), fuse, and controller. A manual kiln uses switches.
Once you have identified the parts, use the diagram to trace the wiring, one wire at a time.
A customer called me a few years ago with continuous, baffling problems with her kiln. After several calls, I finally suggested that she check the wiring diagram. She did, and sure enough, someone had mis-wired the kiln. She fixed it in minutes, and the kiln fired to her complete satisfaction. That's when I realized the importance of the kiln’s wiring diagram in solving kiln problems.
I might add that it is possible to get the wrong diagram, even in the packet that came with the kiln. Check the voltage listed on the diagram.