FluidNC Alarm 11
FluidNCAlarmPosition isn't set yet: home first
A control or limit input was already on when FluidNC started.
Position isn't set yet: home first. Nothing has been homed yet. (Hamrun's reading)
What to do
- Check nothing is pressing a limit switch, the door switch or a control button.
- Check the pin's inverted setting (:low / :high) in the config file.
What users reported CLAIMED · forum and issue reports, not official
- First-run alarm stops on a Genmitsu 4040: the machine wasn't homed, or was parked against a limit switch. Home first, unlock, then check the job. It was the alarm state, not a dead board. r/hobbycnc thread, Jan 2026 (the thread doesn't name the alarm number)
Official FluidNC message: “Input Pin Initially On” 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 FluidNC source on 2026-11-01. Steps and the position answer are Hamrun's reading unless marked “firmware says”. User reports are labelled CLAIMED.