As the topic says i have an F4 (4 flashes) problem with my dishwasher. After reseting the machine and started the wash program it runs fine for about 10 minutes then drains water and then the beeping and flashing starts. When i open the hatch there is only little water left just under the sensor with black grid and rubber membrane inside så the draining pump works. I think that the problem might be another sensor (OWL) that sticks up below the filter inside the washer and is about 4cm long but i am not sure and i would really appreciate some help 
(Please excuse my bad english, i hope you will understand my writing!)
I know what the error code means (drain pump failure etc.) and i have tried the following things to fix the machine:
# Clean all filters
# Removed the drain pump and clean it and the impeller
# Removed and clean the sensor with the rubber membran and also tried it with measure tool and it works fine both with the membran pressed down and unpressed
# reset machine
# pour boiling water in draining tube
(Please excuse my bad english, i hope you will understand my writing!)
I know what the error code means (drain pump failure etc.) and i have tried the following things to fix the machine:
# Clean all filters
# Removed the drain pump and clean it and the impeller
# Removed and clean the sensor with the rubber membran and also tried it with measure tool and it works fine both with the membran pressed down and unpressed
# reset machine
# pour boiling water in draining tube