They will become discolored and possibly warped if left in through a cleaning cycle. If the range has a window in the door, it is sometimes necessary to slide the cover in place. Generally the thermostat is advanced to its clean position as well as the oven selector or function switch. Next the range STOP time is advanced anywhere from 2-4 hours, depending on how much cleaning is needed. Finally if the oven is equipped with a door latch, move it to the right side to begin the cycle.
Some ranges have an auto door latch that is locked by a motor.
Within a few minutes the oven should begin to heat. First the broil element or burner on a gas range comes on, and heats the oven to 500 degrees. At this point the latch is electrically locked into the closed position, the lock light comes on and the bake element or burner takes over. The oven temp will usually get to to 800 or 900 degrees for the amount of time selected. The door latch is locked into place to prevent opening the oven at these high temperatures.