Adam N Katy , TX June 01, 2015 Appliance: Samsung Washer WF218ANW/XAA-0000 Samsung Washer Wf218anw/Xaa-0000 / : "nd" error shows in the screen panel. How to replace Drain Pump Assembly. After cleaning the black rubber drain hoses it still showed "nd" Thinking it was the drain pump motor I ordered and installed the drain pump but same error "nd". I had to pay $95 for an expert to diagnose the problem; he just advised me to buy the whole assembly drain pump which I did. Upon examining the old assembly I discovered the most common culprit of this problem-- a quarter coin was stucked in the white pvc drain inlet causing almost complete obstruction of the drain system. After installing the new whole assembly my washer was back to business. Thanks to your return policy I was able to return the first drain pump although I still have to see the refund reflected in my next credit card statement, excluding of course the shipping cost. If I was just diligent and patient enough to DIY I could have discovered the coin, cleaned the drainage system and reinstalled the original assembly and saved some money. Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes