If the first and second additional function buttons blink three times when you rotate the programme selection knob, then the child lock is activated. You can’t make any changes to programmes, temperature, speed or additional functions while the lock is active.
To deactivate the child lock, press the first and second additional function buttons simultaneously for three seconds while any programme is running. The lights on the buttons will flash while you do so.
You can also switch the programme selection knob to the On/Off position when no programme is running to deactivate the lock.
Activating and deactivating the child lock might change depending on your model. If the above button configurations do not work, consult your user manual. If you’re having trouble finding your manual, download it here using your product’s model number.