Dishwasher shows E12, often associated with water softener or regeneration problems.

Safety: Disconnect power and close the water tap before accessing side panels.

• Check salt level: Open the salt reservoir cap in the tub bottom and ensure it is filled with dishwasher salt. Top up if empty and run a regeneration cycle if available.
• Inspect for salt bridges: Break up any hardened salt at the top of the reservoir with a spoon handle and add fresh salt.
• Access regeneration valve: Remove the side panel to locate the water softener and its small solenoid valve. Check for blockages in the hoses connected to the softener.
• Electrical test: Measure the coil resistance of the regeneration valve and check for 230V during regeneration (qualified persons only). Replace the valve if open or not actuating.