Kenneth E Arnold , MD January 12, 2016 Appliance: Samsung Dishwasher DMT400RHS/XAA Samsung Dishwasher Dmt400rhs/Xaa / : Over water level error. How to replace Assy-Case Sensor;Dmt800,. Replaced the float assembly case and have had 4 successful runs without the error code. Before was getting the error at various times of the wash cycle. The repair job was easy and requires a screw driver and pair of pliers to squeeze the hose clamps. If you are comfortable with pulling out the dishwasher, turning off the power to it and unplugging some hoses and connectors and unscrewing a few things, the job is a pretty easy one. I would also mention that I had a big retailer service department (starts with SEA) come out and quote me on the main PCB board and a few other things that would have totaled hundreds of dollars when all that was really needed was this part. I am thankfully I have found this website as it has the parts and information that I needed to do the job and saved me serious cash! 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes