Luca92 try 21531.

To input the code, press ON. The unit will display ‘CODE * * * * ‘ The ‘C’ will be flashing.
Press [ + or – ] to increment/decrement the first digit of the code, then press [ M ] to select the second digit.
Repeat the procedure until all digits have been entered.
Upon entering the last digit press and hold the [ M ] key to accept the code.
The set will now turn on.

Please let know if this works.

Adrian