Robot vacuum reports C16 and stops; may say 'Please check the water tank' on mopping models.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Water tank not fully inserted, Water tank sensor switch dirty, Pump connector loose, Water level sensor fault

Safety first: Turn the robot OFF and remove the water tank.

Inspect water tank: Check for cracks, leaks, or damaged seals. Ensure the tank cap is closed properly.
Clean contacts/switch: Wipe any electrical contacts or mechanical tabs that signal tank presence.
Reinstall tank: Slide the tank back in firmly until it clicks.
Test mopping: Power on the robot and start a mopping mode to see if the error clears.

If C16 persists: The water tank sensor or pump wiring may be faulty. Replacement of the water tank assembly or internal sensor is required.

Medium 3/5

Water Tank Assembly

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