How do I set the water softener level?
Press and hold the 'PROGRAMME SELECTION' button while turning on the dishwasher. Keep holding for at least 5 seconds until a brief audible signal sounds, then press again to cycle through the water softener settings from d0 to d7 (d4 is factory default). Turn off the dishwasher to confirm the new setting.
From the official Hoover H Wash 500 Washing Machine Instructions manual, page 5
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