Homing Error (GRBL ERROR 9)

We have an official page on troubleshooting the homing switches here:

As @neilferreri noted, Grbl error 9 is:

9 G-code lock G-code commands are locked out during alarm or jog state.

It might be that the machine is starting up on a switch, or a switch is (hopefully temporarily) stuck closed, or faulty. Let us know what you find out and if you need anything, contact us at support@carbide3d.com

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