whirlpool accubake oven

My oven started beeping and turning off. Finally I saw a code e2f6 and took the panel apart to check all the connections. It worked sporadically. I replaced the panel and it worked fine for about 2 weeks. Then the same thing started happening. Contol panels bite! I want to check the ground before I order the control board, but am unsure how to do that. Does this type of oven have a plug like a dryer? Any help would be appreciated. Thank you.

Lisa Slusher