On the HE3, and other models there is a plastic ball in the rubber drain line which leads to the pump assembly. The purpose of this ball is to detect suds. Typically the ball will be in a down position when the pump is running and in an up position when the machine is filled with water. Normally when the pump finishes draining the water, the position of the ball is "down" however, if there is an over abundance of suds then the ball floats "up". In essence, if the pump is running and the ball is "up" you got suds! A circuit "knows" this and puts the cycle on pause. This is also why the "SUDS" function kicks in when you have a pump problem. It's simple technology and it works great most of the time.
However, some folks like to use too much sticky stuff like fabric softener and the ball gets "glued" in the "up" position.
With the bottom cover removed and machine un-plugged you can reach in behind the pump and feel the ball which is inside its rubber boot. If you suspect that it's "stuck with guck" it can be massaged - Then dump in a good amount of bleach into the washer and run an empty cycle (no clothes). This will help clean out the drain line and free the little ball.