I have a Paragon kiln that belonged to my mom. When trying to operate it I do all the steps required to start the firing process and when I start it I got the number 20 on the screen. Every few minutes the number would go down until it got to 17 and then I got an ERR1 message. The kiln never started heating up. Just wanted to know if anyone knows what the problem may be and a possible fix? The kiln is probably pushing 20+ years in age and none of the internal parts have been replaced.