FluidNC Alarm 8

FluidNCAlarmPosition isn't set yet: home first

After touching a limit switch, the machine backed off but the switch still read as pressed.

Position isn't set yet: home first. Homing didn't finish. (Hamrun's reading)
What to do
  1. Increase the pull-off distance ($27, try 2–3 mm).
  2. Check the switch isn't stuck or wired so it always reads as pressed (in your sender, the pin state shows as Pn: in the status line).
Official FluidNC message: “Homing Fail Pulloff” 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 8: After touching a limit switch, the machine backed off but the switch still read as pressed.
  • grblHAL Alarm 8: After touching a limit switch, the machine backed off but the switch still read as pressed.
  • FluidNC Alarm 6: Homing was interrupted by a reset before it finished.
  • FluidNC Alarm 7: The safety door was opened during homing.
  • FluidNC Alarm 9: During homing an axis travelled as far as it's allowed to and never found its limit switch.
  • FluidNC Alarm 14: The controller is set to require homing before anything else.

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