Robert M South Amboy , NJ July 26, 2016 Appliance: Samsung Dishwasher DMT800RHS/XAA Samsung Dishwasher Dmt800rhs/Xaa: I was getting a s5 error on my samsung dishwasher. How to replace Assy-Case Sensor;Dmt800,. This happens now about every 2 1/2 years. The S5 error is a drain restriction error of some sort. The first time, I cleaned everything in the drain base and checked the tube to the drain pipe but it still came up S5 half way through the cycle.. While searching the web I read someone changed the water level sensor. It's an easy part to change. It has taken care of my problem twice now. I guess the contacts corrode because they are in contact with water. I also make sure to clean out the drain screen and base of all the goop that gathers. Also pull the turbine wheel out, there is a screen under there that really clogs up which sends water to the upper trays. 2 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes