I have a Duncan es820-2 kiln, I am new to ceramics and tried my first firing over the weekend. I had bisque ware I set the safety timer to 8 hours and set the firing switches to High. I put a pyrometric bar 05 in the kiln sitter . The kiln shut off after 3 hours , the bar did melt , but the cones that I set on the top shelve (04*05*06) also melted strangely. The 05 bent over correctly but the 06 bent completely over?? So. I tried again the next day, only I set the switches to medium low and timer for 8 hrs. Again the kiln shut off after three hours. I haven't opened it yet but I am not hopeful . Any suggestions ? What am I doing wrong?? Besides Paragon does anyone else sell replacement parts for these kilns. Thanks