When Roomba J7 Combo stops detecting water tank

 

1. Reboot the router (not sure if we need this step)
2. Remove the water tank
3. Move the Roomba off its base
4. Reboot the Roomba, using either the app or the button on the device
5. Return the watertank to the Roomba, click it in
6. Put the Roomba back on its base
7. Close the app and then open it again
8. You should see the sensor working properly, but test the Roomba