The dE error code on the Samsung washing machine display is an indication of the DOOR IS NOT PROPERLY LOCKED OR CLOSED issue. The issues that may cause this fault code is the washer door is NOT CLOSED, a clogged or wrongly positioned drain hose, the drain hose may not be submerged in water and therefore causing the error, or the Door Lock and Switch Assembly is faulty. All these issues can cause your Samsung washer to display the error code dE.