Manual says to call a service person.
You are correct, the HEAVY light blinking indicates a leakage problem. Remember that the Samsung DW's (dishwashers) have a base that holds the water so it doesn't run out on your floor. You will have to pull your DW out so you can remove the right-side metal panel. Pull the insulation up so you can look inside. You will see the floor of the plastic base has a low spot in it, and the water sensor is located over that area. That area must be completely dry (1/8" of water will trigger the error). Once you sop up and dry all the water there, you can start up the dishwasher and watch for leaks. The most common places are the drain pump (also visible on the right-hand side) or the drain hose. And sometimes, there is no leak, but water got in there because you used too much detergent (or the wrong detergent), and it caused it to overflow into the base.
If you need further help, reach me via phone at https://www.6ya.com/expert/ronald_e6b9572cebe3ad27
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