Your dishwasher may fail to start for a variety of reasons. Its water supply may be shut off, the door latch assembly may not be engaging correctly, or the control board could be malfunctioning. Additionally, certain components like hoses, pumps, and valves may require replacement due to wear and tear or could get clogged with food particles and other debris that prevents them from doing their jobs properly. Even electrical issues such as faulty wiring or tripped breakers could prevent your dishwasher from running correctly.