One of the most common reasons your dishwasher refuses to drain correctly is due to a obstruction in the drain path. This drain line, or drain hose, sends water out of the dishwasher tub after a cycle is completed. If the drain line is obstructed, water won’t flow out of the tub. Contact the R & M Climate Control Service Experts pros at 865-229-6176 for plumbing services in Knoxville.