Display shows E7; unit stops and beeps when dirty water tank is not visibly full.

Safety first: Unplug the unit and remove the dirty water tank.

• Clean the tank and float: Empty the dirty water tank completely. Rinse with warm water and mild detergent. Ensure the internal float moves freely and is not coated with foam or residue.
• Inspect level sensor: Depending on model, check the reed switch or electrode contacts in the tank or tank housing. Clean any scale or detergent buildup.
• Check seating: Reinstall the tank, ensuring it is fully pushed into place and the lid is correctly closed. Misalignment can trigger a false full-tank signal.
• Inspect wiring: If accessible, follow the level sensor wires to the control PCB. Look for pinched or broken wires and repair as needed.
• Test operation: Run the unit with clean water to confirm the error is cleared. If E7 persists, the level sensor assembly may require replacement.