What does the error message "M113-Z axis is out of step when nozzle 1 is running" mean?

What is the origin return machine code for error id 44 on a KM-ASSYM5-10 machine?

What is the purpose of
The error M113-Z axis is out of step when nozzle 1 is running, indicating a problem with the Z-axis position of the printer. A possible solution is to perform an origin return, which involves resetting the