Stephen L Stuart , FL February 03, 2017 Appliance: Samsung Washer WF338AAW/XAA Samsung Washer Wf338aaw/Xaa / : Drain and fill error codes also main control board appeared to be malfunctioning. How to replace Drain Pump Assembly. I FIRST REPLACED THE MAIN CONTROL BOARD FOLLOWED BY THE DRAIN ASSEMBLY. I ALSO CLEANED THE HOSE AND ASSEMBLY LEADING TO THE PRESSURE SWITCH WHICH, O UPOIN INSPECTION, SEEMED TO BE BLOCKED. Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours