Hi , I am Tech Michael an expert in this field and I will be assisting you today. I am a Master Technician that's dedicated to giving you the best Answer possible.
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Usually this problem is a bad connection to the ovens main connection point on the back of the oven. But it could also be a bad heating element or temp problem. Please let me know if they glow red when you try to use that oven, so I can narrow this down for you;-)