Roborock robot vacuum reports “Error 9” / “Main unit is stuck” and cannot free itself.

Safety first: Gently lift the robot away from the obstacle and power it off if it continues to struggle.

Step-by-step:

• Inspect the area: Look at where the robot got stuck (door thresholds, cables, vents). Remove or tidy cables and small objects.
• Use no-go zones: In the Roborock app, set virtual walls or no-go zones around problem areas such as high thresholds or floor vents.
• Check bottom shell: Inspect the underside for any loose parts or hanging components that might catch on obstacles.
• Test in open area: Place the robot in a clear space and start a cleaning cycle to confirm it moves normally.

If the robot frequently reports this error on flat floors: There may be an issue with the bumper, wheel suspension, or chassis alignment that requires professional inspection.