There are two possible reasons:
1. The wash program has already started. Once the Start / Pause button has been pressed, the settings are ‘locked’ until the end of the program. To change you have to end the program and start again.
2. Check the child or display lock has not been activated. If it has a child’s head icon will be displayed. Refer to the User Manual for instructions on how to set and remove the child / display lock function.