On the Roomba 800 and 900 Series named by iRobot, operating Error 11 means the vacuum in the bin is not functioning properly. The 900 Series and Wi-Fi-connected 800 Series may include an instruction to open the iRobot app; other 800 Series robots may speak only “Error eleven (11).”
Do not confuse it with Charging Error 11
The operating Error 11 page concerns the vacuum in the bin. The separate iRobot charging chart labels “Charging Error Eleven (11)” as a battery hardware fault while charging. Record the full message and what the robot was doing before choosing a support page.
Use this page when the robot reports the alert during operation or its wording identifies the vacuum in the bin. If the robot is docked and the full message says “Charging Error,” follow the charging-error guidance instead; the same number does not identify the same condition. The operating alert does not by itself diagnose a failed bin, motor, or battery.
When the alert remains
iRobot says an AeroForce bin may need replacement and directs owners to its store, an authorized retailer, or Customer Care. The alert article does not provide a complete bin fitment table, so verify the exact 800/900 Series model before ordering. Do not treat Error 11 as authorization to open the robot or repair its motor.
Before contacting support, have the exact model and complete spoken or app wording ready, including whether the robot was cleaning or charging. The cited iRobot page gives no cleaning, reset, or motor-repair procedure for this operating alert. If the robot is unusually hot, smells burnt, or has liquid or electrical damage, stop using it and contact support rather than opening the bin or robot housing.