Remove the soap dispenser drawer and make sure the interior of the dispenser box is clean as sometimes a soap build up causes water to run out of the vent, refit the soap dispenser drawer.
Whilst you're at it, put a mug full of WASHING soda (not CAUSTIC soda!) crystals directly into the drum and let the machine run right through a 95 degree programme (without prewash). It'll help to clean out any soap muck that may be fouling the water level sensor system. Good luck. :-)
Hefhoover., December 2007