I do not know the m/c, but from what you say, UE is load imbalance, drum not spinning should not stop water going out, load imbalance, the m/c usually tries to rectify it itself, by back/forth movement, water would settle in the outer drum, the waterproof one around where the clothes go, which would then balance the load, does water pump out. I would think that sensors for imbalance would be located, depending on m/c on or around the dampers/springs for the drum, could be top or bottom. Dampers look like the tubes each side of the hatch of a hatchback car, springs, like springs, just a bit bigger than in your biro.
SD, October 2011