grblHAL Alarm 17

grblHALAlarmPosition is lost: home again

A stepper or servo driver reported a fault.

Position is lost: home again. Hamrun's reading: a driver fault stops that motor, so position can't be trusted. (Hamrun's reading)
What to do
  1. Power down and check the motor and driver cables.
  2. Check the driver for overheating or an alarm light.
  3. Home the machine, then set your work zero again before restarting the job.
Official grblHAL message: “Motor fault.” 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.

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.