Failure of trapping in toilet or terrace on Mi Robot Vacuum Mop Pro

1) Check whether the equipment is blocked by door sill or step, and isolate it with virtual wall and then try again.
2) Check whether tank and mopping board is installed properly, and remove the board and mop and then try again.
3) The equipment cannot climb over any obstacle higher than 20mm, so user can isolate it with virtual wall and then try again.