If the machine drains into your sink waste system , the w/m pipe will be pushed onto a graded pipe sticking out from the side. There will be a plastic nut, which should only be hand tight. Undo this and you should find a plastic disc(about the size of a 10p piece). If your system is grey plastic, the disc will probably be orange. Remove this, make sure to replace any washers etc in the correct order and your problem should be solved.
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