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That is a LEAKAGE SENSOR ERROR, water has gotten into the bottom of the unit or the sensor is dirty, watch this video to repair it.
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Can you check the wiring from the SENSOR to the board, sometimes that can cause this issue and if that is ok the main control board has failed, which also is a common issue on that model.
It is likely a bad board these Samsung units have a class action lawsuit against them for this and other issues.
You cant the board has to see it to measure the resistance otherwise it will display that error. The board is bad if the sensor is new and the wiring is good to the board.