JiyaiFora

Hi. First time posting. Hope someone can give me some insight into a question I've been struggling with. My Ceramics class creates a large scale project using black clay, with no glazes. We first bisque the pieces at Cone 06, sand them, and then fire them again at Cone 5 (Cone 6 is stated on the box and produces a nicer black colour, but also lots of bloating). The last time I fired at Cone 5, I used a slow bisque setting. I came back to find an error code on the kiln which basically stated that I'd overheated the control panel. Luckily everything still came out fine, but I want to avoid this happening again because I'm afraid of damaging the electronics. I'm wondering if the length of the bisque fire caused this, and if a slow glaze fire setting would be preferable. Does it matter, considering these pieces have already been bisque fired once? Any other tips on how to avoid the panel overheating? Thanks!