Roborock Robot Vacuum Error Code 21: How to Fix It

Q: How often should I clean my Roborock laser sensor?

Clean the laser sensor weekly or bi-weekly, depending on your home's dust levels and pet hair. Homes with pets or high dust may require more frequent cleaning.

Q: Can I use water to clean the Roborock laser sensor?

No, never use water or liquid cleaners on the laser sensor. Use only dry microfiber cloths and dry brushes to avoid damaging the electronic components.

Q: Why does my Roborock keep getting Error 21 even after cleaning?

Persistent Error 21 may indicate a damaged sensor cover, internal sensor malfunction, or debris stuck inside the mechanism. Try cleaning more thoroughly or contact Roborock support for hardware issues.

Q: Will Error 21 damage my Roborock if I ignore it?

While Error 21 won't cause immediate damage, ignoring it will prevent proper navigation and mapping, leading to poor cleaning performance and potential collisions with furniture.

Q: Can I prevent Roborock Error 21 from happening?

Yes, prevent Error 21 by regular maintenance including weekly sensor cleaning, keeping your floors clear of small debris, and ensuring proper ventilation to reduce dust accumulation on the vacuum.

Abstract

Error 21 on your Roborock robot vacuum means the laser distance sensor (LiDAR) is blocked and needs cleaning. This sensor is crucial for navigation and mapping, so when it's obstructed by dust, pet hair, or debris, your vacuum can't properly navigate your home.