Dryer displays E12; often related to water tank full indication even when empty.

Safety first: Unplug the dryer before inspecting the tank system.

• Verify tank position: Remove and reinsert the water tank firmly until it clicks into place.
• Clean sensor area: Inspect the tank for a float or magnet and clean any scale or residue. Clean electrical contacts with a dry cloth.
• Check float movement: Ensure the float inside the tank moves freely and is not stuck by detergent residue.
• Inspect wiring: Access the area behind the tank housing and check the wiring to the level sensor or reed switch. Reseat connectors.
• Replace faulty sensor: If the sensor does not change state when the tank is full vs. empty (tested with a multimeter), replace the level sensor assembly.