Dirty water tank full error even when tank is empty or partially filled

Safety: Unplug before handling tanks.

• Empty and clean tank: Remove the dirty water tank, empty it completely, and rinse with warm water. Clean any foam or residue from the float chamber.
• Check float operation: Move the float up and down to ensure it is not stuck. Remove hair or debris that may cause it to jam in the upper position.
• Inspect tank seating: Reinstall the tank, ensuring it is fully pushed into place and the lid is correctly latched. Misalignment can falsely trigger the full sensor.
• Clean air path: Check the suction inlet and air channels from the tank to the motor for blockages. Restricted airflow can cause the float to rise prematurely.
• If error persists: The tank full sensor (reed switch or microswitch) may be faulty and require replacement.