Roborock robot vacuum reports “Error 28” / “Water level sensor error” on models with integrated water tanks.
Safety Warning
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
How to Fix / Troubleshooting
Safety first: Remove the water tank from the robot and keep electronics away from water.
Step-by-step:
- Empty and rinse tank: Pour out remaining water and rinse the tank with clean water to remove debris.
- Check float (if visible): Some tanks have a visible float. Ensure it moves freely and is not stuck.
- Dry contacts: Wipe any external electrical contacts dry.
- Reinstall and test: Refill to the recommended level, reinstall the tank, and start a mopping task.
If the error continues: The water level sensor inside the tank or robot may be defective. Replacing the tank assembly or sensor is required.
Repair Difficulty
Required Part
We may earn a commission from links on this page.