Provided is a method for controlling the operation of a cooking appliance, such as an oven range. The cooking appliance includes a door with multiple spaced apart glass panels. The method uses an interlocking mechanism that interferes with the installation of at least one of the plurality of glass panels in the door if at least one of the glass panels is not installed properly. The method further uses a switch with a plunger can be installed in the door, which allows the appliance to operate only when a failsafe electrical circuit is closed corresponding to a selected position of the plunger when the door is closed. The plunger is prevented from retaining that selected position if at least one of the glass panels is improperly installed or if a top cap is not properly seated or installed above the glass panels.