Standing water at the bottom of the tub means the drain system is blocked. First, check the filter/sump area for large food particles. Second, ensure the drain hose connecting the dishwasher to your sink’s plumbing or garbage disposal is not kinked. If your drain hose connects to a garbage disposal, run the disposal—sometimes a blockage here prevents draining. If these steps fail, the drain pump or the check valve is likely faulty and may need professional replacement.