Minecraft wiki entry for Combination_locks, associated text: When constructing, you will probably first want to place the levers and put them into the desired positions. Next, you should place the redstone torches and repeaters. Torches go behind levers that are down and repeaters go behind levers that are up. When you are done, all of the torches and repeaters should be turned off. If not, double check any components that are turned on.