Whilst this is a photo copy, and some of the pages are a little askew, it was all readable and intact. A real bonus finding an old manual for a classic piece of kit that no other site had.
Text excerpt from page 7 (click to view)
The current level is indicated by the number of flashes made by the 70Â° 80â indicator light, that alternates 5 seconds off with a number of flashes, this for about 60 seconds. Example: 1 flash = 2 flashes = 3 flashes = 4 flashes = 5 flashes =
level 1 level 2 level 3 level 4 level 5
3. To change the level, press the 70Â° 80â programme push button. Each time the push button is pressed the level changes. Example: if the current level is 3, pressing only one time the 70Â° 80â programme push button, level 4 is selected. The 70Â° 80â indicator light remains off for about 5 seconds after which starts flashing indicating the new level selected.
4. To memorise the new level, switch off the dishwasher by pressing the ON-OFF push button.
If your water is level 1 it is already soft and therefore there is no need to use salt. With the setting of the water softener at level 1 the salt indicator light on the control panel will always remain off. Use salt from level 2 upwards. From level 2 upwards, if salt refilling is necessary, the salt indicator light will illuminate only in setting mode and at the end of the washing programme. During the run of the programme it will remain off.