Steve D Cumberland , RI January 02, 2017 Appliance: Samsung Washer WF448AAP/XAA-0000 Samsung Washer Wf448aap/Xaa-0000 / : Cycle would not start "water left in from last run would not drai humming noise. How to replace Washer Drain Pump. Thought the hum might be main motor, so disconnected that in back via its wire harness clips. Still hearing hum, removed front panel, found hum to be drain pump - felt it while hearing the noise. Took drain pump off, found broken impeller. Ordered new drain pump, installed it, all is well now and working normally again. 7 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours