Possible Causes

Empty salt reservoir in the softener, incorrect water hardness setting, insufficient rinse aid, very hard local water supply.

How to Fix / Troubleshooting

Safety first: No electrical work is required for this procedure.

Check salt: Open the salt reservoir in the Fagor dishwasher and refill with dishwasher salt if empty. Wipe away any spilled salt.
Set hardness: Adjust the built-in water softener setting according to your local water hardness (see user manual).
Rinse aid: Ensure the rinse aid dispenser is filled and adjust the dosage to a higher setting if spotting persists.
Descale: Run an empty hot cycle with a dishwasher descaler to remove existing limescale from the tub and heater.