Andy O Myrtle Beach , SC November 03, 2015 Appliance: Samsung Dishwasher DMT400RHS/XAA Samsung Dishwasher Dmt400rhs/Xaa / : Heavy/smart auto lights flashing and water keeps flowing from inside seems like it's not draining. How to replace Dishwasher Water Valve. Replaced the water supply main valve. 3 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes