_gcode/M999.md


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---
tag: m0999
title: STOP Restart
brief: Return the machine to Running state
author: thinkyhead

group: control

codes: [ M999 ]

notes:

parameters:
  -
    tag: S
    description: Resume without flushing the command buffer. The default behavior is to flush the serial buffer and request a resend to the host starting on the last `N` line received.
    values:
      -
        type: bool

examples:
  -
    pre: Restart the machine
    code: M999

---

If a **STOP** occurs you can use [`M999`](/docs/gcode/M999.html) to restart the "stopped" machine after resolving the issue.

Marlin will call **STOP** if any error occurs that would make continuing the current process problematic. For example, if the probe fails to deploy, it will abort probing and STOP. Note that this disables all heaters.