I had the same thing happening. I removed the bottom tray, and used a flashlight to look around.... sure enough, i found a piece of the kids "baby sippy cup straw" lodged in the bottom of the machine under the plastic fingers. Some fiddling, and i got it out. Reinstalled the bottow drawer, and presto- it works again. Bottom line: Check the simplest things first. LOL!
Dishwasher Heavy Error Code Repair Samsung - YouTube
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https://www.youtube.com/watch?v=uLoj9TpqVRM
Aug 14, 2014 - Uploaded by JoeBrownToolGuy
Dishwasher error code "Heavy" flashing light. Samsung Model DMT400. Video shows what you need to do ...
4,745 views
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