Before Using The First Time; Setting The Water Softener; Filling With Salt; To Select A Different Level, Proceed As Follows - Zanussi ZDT 6252 Instruction Book

SR06
Only for dishwasher models with salt refill
indicator light:
if the water softener has been adjusted on level 1 without use of
salt, the salt refill indicator light on the control panel will always
remain illuminated when the machine is switched on.