Why does my thermador double oven cannot use lower oven

There could be several reasons why your Thermador double oven is unable to use the lower oven: 1. Power Supply Issue: Check if the oven is receiving adequate power. A faulty power supply, such as a tripped circuit breaker or a blown fuse, can prevent the lower oven from working. 2. Temperature Sensor Problem: If the temperature sensor in the lower oven is malfunctioning, it may not accurately read the oven's temperature, leading to issues with heating and operation. 3. Faulty Heating Element: A faulty heating element in the lower oven can result in uneven or no heating, causing the oven not to function correctly. 4. Control Board Malfunction: A malfunctioning control board can disrupt the oven's operation and prevent the lower oven from working as intended. 5. Door Lock Issue: If your oven has a self-cleaning feature, the lower oven door may have a lock that engages during the cleaning process. If the lock is stuck or not disengaging properly, it can prevent the oven from functioning. 6. Timer or Delay Start: Check if the oven has a timer or delay start feature. If the timer is set or the delay start is active, it could be causing the lower oven not to turn on until the set time is reached. 7. Child Lock Engaged: Some ovens have a child lock feature that can disable certain oven functions. Ensure the child lock is not engaged if your oven has this feature. To resolve the issue, try troubleshooting the potential causes mentioned above. If you are unable to identify or fix the problem, it is advisable to contact Thermador customer support or a qualified appliance technician for further diagnosis and repair.