One of the most common reasons your dishwasher refuses to drain well is because of a obstruction in the drain tube. 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. Get in touch with the Service Experts Heating & Air Conditioning pros at 303-647-5853 for plumbing services in Denver.