The water will not pump out on rinse cycle.
Answer Gardner, The discharge housing is not the issue. It produces pressure to the wash arms in the wash cycle. Apparently this is a Mayatg dishwasher and it probaly has a two direction motor, so do you hear the motor reverse and the pump attempt to drain ? Try disconnecting the drain hose from the displosal or air gap and see if it will drain, you may have an obstruction in the line. Thanks and Good Luck