Cannot get dishwasher to rinse. Drains fine. No lights flash, just keeps running (over 2 hours before we stopped it).
Here are your parts
Parts for Whirlpool DU1055XTPQ4 Dishwasher - AppliancePartsPros.com
See the attachment for the tech sheet.
Try rinse only.
If that works then it could be that the unit is stuck in a thermal hold re: it is waiting for the water temperature to rise to a certain level before continuing.
Remove power from he unit and check the heater (should be about 20 ohms) and the hi-limit thermostat (should be 0 ohms)