Tecnik built in dishwasher

These arms spin based on water pressure generated from the washer itself.

Run the washer. As soon as the washer is full of water and the wash cycle starts, open the door and verify that you have at least a couple inches of water in the machine. If there is not enough water in the machine, the pump will not be able to provide pressure. If this is the case, the filling sensor is malfunctioning and will need to be checked.

There's a pump that provides water pressure. It's at the bottom of the machine beneath the lower rotating arm, probably beneath additional plastics. Remove these two items and verify that there is no debris blocking water from reaching the pump as if this is the case, water pressure cannot be generated.

Good luck... let me know what happens, and please rate accordingly.