how can i fix my Baumatic BDW13 Dishwasher?

Getting dreaded E4 Error code! Have tried the suggestion re taking panels off and drying base of pan ... but when trying to run cycle it gets almost to the end of the cycle then beeps about 30 times and E4 error code reappears. This machine is integrated into a kitchen unit and i am unable to take out of its housing due to fitted wooden floor so cannot see how i can 'tilt' it. Any suggestions welcome.