Ive got this machine,and it seems to be stuck in a sort of Demo mode.
Whatever you select it just lights up all the function lights one after the other and also the time left display changes with the different wash modes…
Not sure if this works for the 520, its from a later one, hope it helps.
Accessing Demo Mode
1. Press and hold the Start Button while switching the unit on with
the On/Off Button.
2. As soon as the Start LED lights up, release the Start Button.
3. Immediately press and hold the Start Button, until the Start
LED turns off.
Deactivation
Repeat the accessing procedure.