Last night I was running a large batch of 155gr .40 cal. I was putting some finished .380 in the sizer when inside the control panel, the production side board of my MKIV started making a wierd sound from the relay. (the little blue one on the board itself.) It was like a rapid fire relay. i am assuming the temp sensors are working but it wont cut the element on by itself due to rapid fire. It makes the element switch do the same rapid fire. You can turn temp dial down and close the relay switch that turns the actual element on and element works. You just have to hold it. I was able to finish the batch by regulating the temp by hand. Is it the board itself? Thermocouple? Any ideas? I am putting a call into magma when they open I just figured someone on here might have an idea. It is a MKIV. i realized it after I wrote. can't edit title.