Not being model specific, You should have a filter for the pump, located at the front of most machines, Might have a pull off panel at base of machine, or an access plate. When you find it, get a tray as deep as you can, and undo the filter cover, water will come out, you can always put the drain plug back in to stop the flow, you will probably get a bit of wet floor, Last time this happened on my wifes machine, filter was full of bits of tissues, (left in pockets and sleeves). Clean out the filter, (which you are supposed to do now and again) try that.
MJK, March 2011
