Hi There
I had the same issue on a Ducato 2.8 JTD, ....several times. I traced the fuses, relay boc behind the Glove box to no avail.
I ended up removing the interior door panel and actually the problen was that the motor shaft in the winding gear box was stuck. By removing the two screws that hold the motor to the winding box and removint the motor and replacing it the window opned and closed fine.
Rgds
Dom