What could be the possible reasons for the "left suction nozzle" of a vacuum suction machine to be abnormal, as indicated by the error code [Rear section] M7057-The left suction nozzle is abnormal in vacuum suction machine code of KM-
M7057 error in vacuum suction indicates abnormal behavior in the left suction nozzle of the rear section. To fix the error, inspect and clean or replace the nozzle as required.