bosch d/washer pumping out constantly

[keith8b]

hi i've a bosch SGSE0245GB/56 dishwasher pumping out constantly i've checked the base no water in there float switch not stuck the impellor jug i've replaced & still it pumps out the only way i've found to stop it is to hit the front of the m/c to the left of the display with the palm of my hand sharply ( causing no damage to me or the m/c ) & it stops for a while opr until the drain pumpkicks in again then i hit again if its pumping out as it fills

 

[gromitsmate]

Check the pressure chamber on the lefthand side is not jammed as there is a float switch in there.