One of the most common reasons your dishwasher won’t drain properly is due to a obstruction in the drain tube. This drain line, or drain hose, flows water out of the dishwasher tub after a cycle is completed. If the drain line is clogged, water can’t flow out of the tub. Reach the Service Experts Heating & Air Conditioning pros at 305-440-1505 for plumbing services in Miami.