Display shows E7, water level indicator flashing even with full clean water tank

Safety first: Unplug the machine before removing tanks or covers.

• Reseat clean water tank: Remove the clean water/solution tank and check the bottom valve and seals. Refit firmly until it locks into place. Ensure no plastic film or packaging remains on the tank base.
• Check tank float: If the tank has an internal float, inspect it for free movement. Rinse the tank with warm water to free any detergent residue that may be sticking the float.
• Clean sensor area: On models with an external sensor window, wipe the area on the base and the corresponding area on the tank to remove dirt or limescale.
• Inspect wiring: If accessible, locate the level sensor (often a reed switch or small PCB near the tank base). Check for loose connectors or damaged wires. Reseat connectors.
• Replace sensor if needed: If the sensor does not change state when the tank is removed/refitted (tested with a multimeter by a competent person), replace the water level sensor assembly.