I've had the same problem with my W828 since I bought it.
He's my suggestion. The W828 expects water to be fed in at a certain pressure. You water should flow at 5 litres per 15 seconds (according to the user manual). Mine only flows at about 2.5 litres every 15 seconds. The result is that the machine thinks the inlet is blocked because it isn't getting water fast enough.
As the W828 is computer controlled then this can be reprogrammed to let the machine to wait longer for the incoming water to arrive before deciding there's a blockage. These are the steps you need to take to make this change;
With an empty machine
1. Turn the machine off
2. Move the selector knob to the 'Finish' position
3. Whislt pressing the 'Short' and 'Water Plus' buttons, turn the machine on
4. The 'main wash' indicator should flash
5. Turn the selector to 'Drain'
6. Press the start button. The rinse light should come on.
This indicates that you have changed the fill time from approx 60 seconds to 155 seconds.
7. Turn the machine off
Woodyrvf750, February 2010