Our upstairs washing machine was flashing the error code "ND" for No Drain. I cleaned out the filter on the front but it still wasn't working. Greg pulled open the back at 11 p.m. after he got home from his game. He got a lot of water to drain out of the back. An hour later, and we concluded that we needed to call in an expert on Monday. Good thing we have another washer and dryer in the basement!