We have a Kitchen Aid double oven that is nearly a year old (builder installed.) We ran the self cleaning option on both ovens (top first) for the first time and now the lower oven no longer works. The upper oven works just fine. Any ideas?

First, I would not delay in notifying your builder by phone and then follow up in writing so that you have a record that you have told him about the problem. Your stove may still be under warranty. He should be able to direct you to filing a claim. One question though, does your oven have a "Sabbath Mode" setting? If so, that could interfere with the regular operation of the oven. What style and model number is the oven?