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So these Jenn Air ovens are fairly well known for this issue unfortunately and when half the buttons stop working but the other have still work, it means that your touch control panel has failed and will need to be replaced. Unfortunately the entire touch control panel will need to be ordered and replaced which is about $300 or so normally depending on the model number but you'll need the model number to know what part number to order. The model is usually located on the bottom frame of the oven on the right side on a sticker. If you remove the bottom panel below the door, then you can look back with a flashlight to locate it but it's very difficult to see usually.
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That's up to you, but it would still definitely be much more expensive than $300 to exchange the entire oven rather than repair it.
Hello again. I'm just following up because I haven't heard back from you and I see this question is still open. Is there anything else I can help you with?