GRBL Error List

Code	Message	Description
1	Expected command letter	G-code words consist of a letter and a value. Letter was not found.
2	Bad number format	Missing the expected G-code word value or numeric value format is not valid.
3	Invalid statement	Grbl '$' system command was not recognized or supported.
4	Value < 0	Negative value received for an expected positive value.
5	Setting disabled	Homing cycle failure. Homing is not enabled via settings.
6	Value < 3 usec	Minimum step pulse time must be greater than 3usec.
7	EEPROM read fail. Using defaults	An EEPROM read failed. Auto-restoring affected EEPROM to default values.
8	Not idle	Grbl '$' command cannot be used unless Grbl is IDLE. Ensures smooth operation during a job.
9	G-code lock	G-code commands are locked out during alarm or jog state.
10	Homing not enabled	Soft limits cannot be enabled without homing also enabled.
11	Line overflow	Max characters per line exceeded. Received command line was not executed.
12	Step rate > 30kHz	Grbl '$' setting value cause the step rate to exceed the maximum supported.
13	Check Door	Safety door detected as opened and door state initiated.
14	Line length exceeded	Build info or startup line exceeded EEPROM line length limit. Line not stored.
15	Travel exceeded	Jog target exceeds machine travel. Jog command has been ignored.
16	Invalid jog command	Jog command has no '=' or contains prohibited g-code.
17	Setting disabled	Laser mode requires PWM output.
20	Unsupported command	Unsupported or invalid g-code command found in block.
21	Modal group violation	More than one g-code command from same modal group found in block.
22	Undefined feed rate	Feed rate has not yet been set or is undefined.
23	Invalid gcode ID:23	G-code command in block requires an integer value.
24	Invalid gcode ID:24	More than one g-code command that requires axis words found in block.
25	Invalid gcode ID:25	Repeated g-code word found in block.
26	Invalid gcode ID:26	No axis words found in block for g-code command or current modal state which requires them.
27	Invalid gcode ID:27	Line number value is invalid.
28	Invalid gcode ID:28	G-code command is missing a required value word.
29	Invalid gcode ID:29	G59.x work coordinate systems are not supported.
30	Invalid gcode ID:30	G53 only allowed with G0 and G1 motion modes.
31	Invalid gcode ID:31	Axis words found in block when no command or current modal state uses them.
32	Invalid gcode ID:32	G2 and G3 arcs require at least one in-plane axis word.
33	Invalid gcode ID:33	Motion command target is invalid.
34	Invalid gcode ID:34	Arc radius value is invalid.
35	Invalid gcode ID:35	G2 and G3 arcs require at least one in-plane offset word.
36	Invalid gcode ID:36	Unused value words found in block.
37	Invalid gcode ID:37	G43.1 dynamic tool length offset is not assigned to configured tool length axis.
38	Invalid gcode ID:38	Tool number greater than max supported value.