grblHAL Alarm 6

grblHALAlarmPosition isn't set yet: home first

Homing was interrupted by a reset before it finished.

Position isn't set yet: home first. Homing didn't finish, so the machine doesn't know where it is yet. (Hamrun's reading)
What to do
  1. Run homing again ($H) and let it finish.
Official grblHAL message: “Homing fail. The active homing cycle was reset.” source

Got a different message?

Paste it into the decoder. Hamrun's editor checks your G-code before you run it, so a toolpath that leaves the machine's travel or a missing feed rate is caught before the machine stops.

Related codes

  • GRBL 1.1 Alarm 6: Homing was interrupted by a reset before it finished.
  • FluidNC Alarm 6: Homing was interrupted by a reset before it finished.
  • grblHAL Alarm 7: The safety door was opened during homing.
  • grblHAL Alarm 8: After touching a limit switch, the machine backed off but the switch still read as pressed.
  • grblHAL Alarm 9: During homing an axis travelled as far as it's allowed to and never found its limit switch.
  • grblHAL Alarm 11: The controller is set to require homing before anything else.
  • grblHAL Alarm 15: On a machine with two motors on one axis, the second limit switch wasn't found when squaring.
  • grblHAL Alarm 18: Homing is set up in a way the controller can't run.

Official text copied from the grblHAL source on 2026-11-01. Steps and the position answer are Hamrun's reading unless marked “firmware says”. User reports are labelled CLAIMED.