Range Diagnostics Oven is locked and can't be opened.
Locked ovens occur for a variety of reasons, the most common of which is a bent latch mechanism.
Many latches are only sheet metal and easily damaged. The latch assembly includes up to three switches that monitor the latch arm position. Access to the latch usually requires removal of the oven from the cabinet. In a few cases, it can be accessed through the front grill or console. Many GE latches are mounted on the back of the oven and operated by long lever arms.