BOSCH WFL2260?

Here are the symptoms: -
Wash cycle seems ok but can not be sure.
When complete the rinse commences but am unaware what happens next. This is what I have done
Started washing clothes and waited for cycle to end(!) or problems start. Switched off and set program knob to rinse.
As water enters the system it flows for a few seconds and stops. The activity light goes out. The activity light comes on and water again starts to fill the drum. This sequence continues until I need to intervene because the water level in the drum has reached half way up the glass door.

At this point I select spin and after a while the water starts to empty. When a sufficient amount has emptied I stop the spin (no spinning has began), and set the knob to wash again. This now allows clean water to rinse the clothes and when I think it has rinsed enough I set the knob to off then spin again until all the water has emptied. When the drum is empty the spin cycle should continue but does not. What happens is there is a clunking sound and the activity light goes out again, when it comes back on the machine tries to start the spin again and the sequence is repeated.