I've only had this dishwasher for two years. All of a sudden, I started getting an overfill error (the Heavy and Smart Auto lights flash). I have tried cleaning the drain, and still cannot figure out what is wrong. Sometimes, it will stop at the beginning of the cycle, sometimes in the middle, then sometimes it will make it through an entire cycle without stopping. We pulled the DW out of the cabinet, and drained the water in the air brake. I ran it for about three cycles before I started having trouble again. The pump seems to be working fine... Any ideas on what the problem might be?

https://www.repairclinic.com/RepairHelp/How-To-Fix-A-Dishwasher/36-160--/Samsung-Dishwasher-Overflowing

Water level error. Most likely brake case assy.

A Samsung Dishwasher flashing the Smart Auto light indicates a Water Supply Error (Not Enough Water) has been detected by the internal electronic diagnostics.
You can find more info here
https://appliancerepairinfo.com/samsung-dishwasher-smart-auto-light-flashing/

http://www.appliancepartspros.com/diy-story-error-code-over-fill-flashing-smart-auto-diy916377.html

This may help its a PDF, right click and open however, tells what the lights are and possible problems/solutions. Good Luck tim


http://www.applianceblog.com/mainforums/attachment.php?s=5c81371564d95e9ddfea98fd85bf5680&attachmentid=17263&d=1402739707

The flashing lights are error codes. I need the model number of the unit to make a more accurate diagnosis--usually, each light will blink a certain number of times telling you what the error code number is. You will either have to post that number on this site or look up your model number, and the error codes list.

Hello. The lights you describe are an error code that means over-level filling (overflow condition) and/or the leakage sensor underneath has detected water. You need to check underneath the unit for any moisture. There is a leakage sensor located at the center of the base, underneath the unit. If it detects water, it will notify the main board which will stop the unit until the condition is cleared.

That's a High-temp Heating Error. It's usually caused by a bad ECS sensor. You will need to call a professional repairman to replace it. (I recommend Sears).

If you need further help, reach me via phone at https://www.6ya.com/expert/ronald_e6b9572cebe3ad27

It means "over-level water error". Usually caused by a bad case-brake assembly.

If you need further help, reach me via phone at https://www.6ya.com/expert/ronald_e6b9572cebe3ad27

I have a Samsung DMT400RHS and I started getting the low water level error ('Normal'+Heavy'+Smart Auto' LED blinking). The error started intermittently a few weeks ago, but the the last day or two the problem was solid, and simply restarting the cycle no longer worked.
I looked of the code in the dishwasher user guide and it said 'low water level.' Searched the internet and located the repair manual at tradebit.com for $15. The manual was well worth the $15.
The manual suggested: 1) loose level sensor connector 2) Faulty Assy case sensor or stuck floater aka 'remove foreign matter' 3) Bad Main PBA assy.
Since we do 10+ loads a week for the last 18 months the stuck floater seemed to be the most likely cause.
Go to Samsung DMT400RHS Low Water Level Error ('Normal'+Heavy'+Smart Auto' LED) (new link is https://photos.google.com/album/AF1QipNtp1neOR7icVG8cSs71bLpxQD5k_xljiWcJD2P click the i on each picture to see the caption - DM 04/17/2016) to see the pictures and read the captions documenting what I did. Do this at your own risk. You must turn off and disconnect the electric power and turn off the water supply before you begin.