Robot reports E13; water tank model may stop mopping function.

Safety first: Turn off the robot and remove the water tank. Do not operate the robot with leaks present.

Check tank installation:

• Inspect the water tank for cracks or deformation.
• Ensure the tank slides fully into place until it clicks and that the locking tabs engage.

Clean contacts and valves:

• Wipe the electrical contacts on the tank and robot with a dry cloth.
• Check the outlet valve and filter on the tank for blockages; rinse if allowed by the manual and dry thoroughly.

Test mopping:

• Refill the tank with clean water, reinstall it, and start a mopping cycle.

If E13 persists: The tank detection switch, water level sensor, or pump may be faulty. Replacement of the water tank assembly or internal pump module may be required. Because water and electronics are involved, professional service is recommended.