Error 671 on the Roomba® Plus 400 or Plus 500 Series Combo robot means the AutoWash Dock’s Clean water tank is empty or missing. The robot will be unable to wash the pad. Please check that the dock’s fresh water tank is full and properly installed.
1. Completely remove the clean water tank from the dock.
2. Fill water to the maximum level.
3. Fully re-insert the tank back into the dock.
4. Ensure the robot is securely and properly placed on the dock, making contact with the charging ports.
5. Close and re-open the app. Then try refilling the robot again.
If the error persists, please reboot the robot through the app, or by removing the robot from the dock and holding down the power button on the robot for 10 seconds. Hold the button again for 3 seconds to turn it back on. Doing so should clear the error from the robot's memory.
Reboot the dock as well by unplugging it and plugging it back in. Then please try washing the pad again.
If you performed all troubleshooting steps, but your dock still does not work properly, please contact iRobot Customer Care.
For expedited service, please have the following ready:
