Bill R Austin , TX March 18, 2016 Appliance: Samsung Dishwasher DMT300RFB/XAA Samsung Dishwasher Dmt300rfb/Xaa / : Over level water error (heavy and quick lights blinking). How to replace Assy-Sensor Level;Dm1. The repair involved replacing the water level sensor assembly. The instructional video was very helpful, at least as far as it went. The twist-off screen inside the tub was a bit stubborn, but fortunately I have a pin spanner which removed it without damaging the plastic. The only other glitch was that the microswitch and the 2 blue wires and plug assembly -- which, in the parts diagram are pictured as part of the assembly that I ordered -- were not included with the "assembly" that I received and had to be transplanted from the old unit to the new one. The part supplied was not an OEM Samsung part but rather a cheap made-in-China knockoff, which probably explains the difference in the part. Customer service very kindly offered to provide the proper assembly, but at this point the job was completed and I really didn't feel like doing it a second time. Everything seems to work fine right now, but I would encourage you to check the part before beginning the repair process and make sure that you get everything that you ordered. Aside from this, the job was relatively easy and went smoothly. 9 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes