John B Altoona , PA May 16, 2021 Appliance: Samsung Dishwasher DMT400RHS/XAA Samsung Dishwasher Dmt400rhs/Xaa / : Error code on Samsung dishwasher high level. How to replace Assy-Case Sensor;Dmt800,. Needed to fix this machine in the past with similar issue. Replaced the part and had service from the washer for maybe 6 months. Watched video and found the connected component was the likely next problem. Ordered the part per Appliance Parts Pros, it arrived as promised and it was reasonably easy to install. Never buy a Samsung Appliance is my advice. Have issues with the fridge too but if you need to do a repair, these people are great. $100 and 45 mins saved me $1000. Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes