Nathan J Parker , CO November 23, 2014 Appliance: Samsung Dishwasher DMT400RHS/XAA Samsung Dishwasher Dmt400rhs/Xaa / : Over water level error. How to replace Assy-Case Sensor;Dmt800,. I replaced the water level sensor on the side of the dishwasher. Had to completely take out dishwasher and set on its side. Removed three hose clamps and three electrical disconnects. I have hard water and it looked like the float inside of the sensor wasn't moving properly. 23 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours