When it comes to built-in ovens, here are common issues you might encounter and how to troubleshoot them:

1. Uneven Cooking: If your oven is cooking food unevenly, check the positioning of the racks. Adjust them to ensure proper air circulation for even cooking.

2. Oven Not Heating: If your oven isn't heating up, first check the power source. If the power is fine, the issue might be with the heating elements. Inspect and replace them if needed. For a gas oven not heating, first check the gas supply, then inspect and replace the heating elements or igniter if needed.

3. Temperature Inaccuracy: If you suspect temperature issues, use an oven thermometer to verify the accuracy. If there's a discrepancy, recalibrate the oven according to the manual.

4. Faulty Door Seal: A damaged door seal can lead to heat loss. Inspect the seal for any cracks or gaps and replace it if necessary to maintain proper insulation.

5. Self-Cleaning Problems: If your oven has self-cleaning features that aren't working, ensure the oven is cool, and the door is locked properly during the self-cleaning cycle.