One of the most common reasons your dishwasher won’t drain correctly is on account of a blockage in the drain line. This drain line, or drain hose, flows water out of the dishwasher tub at the end of a cycle. If the drain line is obstructed, water isn’t able to flow out of the tub. Reach the Service Experts Heating & Air Conditioning pros at (713) 352-7887 for plumbing services in Houston.