Sometimes food debris lemon pips and crud creep past the filters and get into the drain pump impeller making it stall.
It's right at the very bottom of the sump underneath a cover - one torx screw holds down the cover - tweezers will help remove any debris.
The impeller should spin freely but with a bit of magnetic resistance.
A five minute job that costs nothing.
Good luck...
Peccavi
January 2013