There are several potential faults that can occur when making bread, as outlined in the document. Bread can be over or under proofed, have too much or too little yeast, or be baked at temperatures that are too high or too low. These issues can result in bread having a hard or thick crust, poor taste, cracking, holes and tunnels, small volume, poor shape, or texture issues. Care must be taken to properly mix ingredients, knead the dough, proof it for the correct time, and bake at the right temperature to avoid these faults.