Hard Limit and Re-homing

Busyone · October 20, 2026, 10:17pm

Hello,

I am getting the following message: Hard limit triggered. Machine position is likely lost due to sudden and immediate halt. Re-homing is highly recommended.

I had this message on my previous laser, which I gave up on and bought a new one. This one is a Sculpfun S40 Max.

Can someone tell me how to re-home?

Thanks,

Keith

parsec · October 20, 2026, 11:11pm

Hi Keith read the Alarm 1 doc:

For rehoming click the house icon in the middle of the buttons on the Move Window.

Busyone · October 20, 2026, 11:28pm

Thanks for that, Is the House in the Move window the same as the Home button in the Laser widow?

MikeyH · October 20, 2026, 11:35pm

48w laser, 830mm x 800mm work area, Homes front left corner.

Two things can cause the Alarm 1 on a new laser:

You told Lightburn the work area is bigger than it actually is. Using 820mm x 790mm may compensate for the module not stopping in time at a boundary.
You are not using Absolute Coords in the Laser window. Using Current Position or User Origin requires a complete understanding of the coordinate system and how new positions are computed.

Re-Homing the laser will not fix either of these issues. It only reestablishes a known reference position to the laser and Lightburn.

Busyone · October 20, 2026, 11:48pm

I am not sure where to begin getting back going. I have already trashed a good xTool laser thinking it was the laser. I bought a new laser and got the same Error message. Forgive me, but the only thing I can do as this point is to insert the messages in the console for review. I used the laser earlier today without an issue.

Waiting for connection…

\x05ok

[MSG:Machine tilt sensor initialization successful!]

ok

[VER:1.3a.20250326:]

[OPT:MPHB]

[MSG:Using machine:Sculpfun S70MAX]

[MSG:No BT]

ok

[G54:0.000,0.000,0.000]

[G55:0.000,0.000,0.000]

[G56:0.000,0.000,0.000]

[G57:0.000,0.000,0.000]

[G58:0.000,0.000,0.000]

[G59:0.000,0.000,0.000]

[G28:0.000,0.000,0.000]

[G30:0.000,0.000,0.000]

[G92:0.000,0.000,0.000]

[TLO:0.000]

[PRB:0.000,0.000,0.000:0]

ok

<Idle|MPos:0.000,0.000,0.000|FS:0,0|LI:-1.00>

[MSG:Bluetooth Module initialization successful!]

<Idle|MPos:0.000,0.000,0.000|FS:0,0|Ov:100,100,100|LI:-1.00>

Project loaded in 37 milliseconds

<Idle|MPos:0.000,0.000,0.000|FS:0,0|LI:-1.00>

ok

<Idle|MPos:0.000,0.000,0.000|FS:0,0|LI:-1.00>

ok

<Idle|MPos:0.000,0.000,0.000|FS:0,0|LI:-1.00>

Starting stream

Stream completed in 0:00

[MSG:Y Limit switch triggered]

ALARM:1

Hard limit triggered. Machine position is likely lost due to sudden and immediate halt. Re-homing is highly recommended.

[MSG:Hard Limit]

[MSG:Reset to continue]

Grbl 1.3a [‘$’ for help]

[MSG:Y Limit triggered]

[MSG:Check limits]

[MSG:‘$H’|‘$X’ to unlock]

Grbl 1.3a [‘$’ for help]

[MSG:Y Limit triggered]

[MSG:Check limits]

[MSG:‘$H’|‘$X’ to unlock]

[MSG:Caution: Unlocked]

ok

<Idle|MPos:-0.570,-5.070,0.000|FS:0,0|Pn:Y|LI:-1.00>

[MSG:Laser lens contamination detection initialization successful!]

<Idle|MPos:-0.570,-5.070,0.000|FS:0,0|Pn:Y|LI:-1.00>

[MSG:Square wave pump]

[MSG:BT Started with S70MAX_3604546]

Grbl 1.3a [‘$’ for help]

[MSG:Y Limit triggered]

[MSG:Check limits]

[MSG:‘$H’|‘$X’ to unlock]

<Alarm|MPos:0.000,0.000,0.000|FS:0,0|Pn:Y|LI:-1.00>

ok

Error:9

G-code locked out during alarm or jog state.

[MSG:Caution: Unlocked]

ok

[VER:1.3a.20250326:]

[OPT:MPHB]

[MSG:Using machine:Sculpfun S70MAX]

[MSG:No BT]

ok

[G54:0.000,0.000,0.000]

[G55:0.000,0.000,0.000]

[G56:0.000,0.000,0.000]

[G57:0.000,0.000,0.000]

[G58:0.000,0.000,0.000]

[G59:0.000,0.000,0.000]

[G28:0.000,0.000,0.000]

[G30:0.000,0.000,0.000]

[G92:0.000,0.000,0.000]

[TLO:0.000]

[PRB:0.000,0.000,0.000:0]

ok

<Idle|MPos:0.000,0.000,0.000|FS:0,0|Pn:Y|LI:-1.00>

[MSG:Machine tilt sensor initialization successful!]

<Idle|MPos:0.000,0.000,0.000|FS:0,0|Pn:Y|LI:-1.00>

\x88n\xFFW\x8CBB4\x92\x89 F:\x85\xAD\x13\xB7?\x95\xCF\xE6\xFF<Alarm|MPos:0.000,0.000,0.000|FS:0,0|Pn:Y|WCO:0.000,0.000,0.000|LI:-1.00>

ok

[VER:1.3a.20250326:]

<Alarm|MPos:0.000,0.000,0.000|FS:0,0|Pn:Y|Ov:100,100,100|LI:-1.00>

ok

[G54:0.000,0.000,0.000]

[G55:0.000,0.000,0.000]

[G56:0.000,0.000,0.000]

[G57:0.000,0.000,0.000]

[G58:0.000,0.000,0.000]

[G59:0.000,0.000,0.000]

[G28:0.000,0.000,0.000]

[G30:0.000,0.000,0.000]

[G92:0.000,0.000,0.000]

[TLO:0.000]

[PRB:0.000,0.000,0.000:0]

ok

<Alarm|MPos:0.000,0.000,0.000|FS:0,0|Pn:Y|LI:-1.00>

ok

Starting stream

Error:9

G-code locked out during alarm or jog state.

On or near line 1:

Error:9

G-code locked out during alarm or jog state.

On or near line 1:

Error:9

G-code locked out during alarm or jog state.

On or near line 1:

Job halted

Stream completed in 0:00

Error:9

G-code locked out during alarm or jog state.

<Alarm|MPos:0.000,0.000,0.000|FS:0,0|Pn:Y|LI:-1.00>

ok

<Idle|MPos:0.000,0.000,0.000|FS:0,0|LI:-1.00>

[MSG:Bluetooth Module initialization successful!]

<Idle|MPos:0.000,0.000,0.000|FS:0,0|Ov:100,100,100|LI:-1.00>

ok

<Idle|MPos:0.000,0.000,0.000|FS:0,0|LI:-1.00>

Starting stream

Stream completed in 0:00

[MSG:Y Limit switch triggered]

ALARM:1

Hard limit triggered. Machine position is likely lost due to sudden and immediate halt. Re-homing is highly recommended.

[MSG:Hard Limit]

[MSG:Reset to continue]

Grbl 1.3a [‘$’ for help]

[MSG:Y Limit triggered]

[MSG:Check limits]

[MSG:‘$H’|‘$X’ to unlock]

Grbl 1.3a [‘$’ for help]

[MSG:Y Limit triggered]

[MSG:Check limits]

[MSG:‘$H’|‘$X’ to unlock]

[MSG:Caution: Unlocked]

ok

<Idle|MPos:-0.560,-5.000,0.000|FS:0,0|Pn:Y|LI:-1.00>

[MSG:Laser lens contamination detection initialization successful!]

<Idle|MPos:-0.560,-5.000,0.000|FS:0,0|Pn:Y|LI:-1.00>

ok

<Alarm|MPos:0.000,0.000,0.000|FS:0,0|Pn:Y|WCO:0.000,0.000,0.000|LI:-1.00>

ok

[VER:1.3a.20250326:]

<Alarm|MPos:0.000,0.000,0.000|FS:0,0|Pn:Y|Ov:100,100,100|LI:-1.00>

ok

[G54:0.000,0.000,0.000]

[G55:0.000,0.000,0.000]

[G56:0.000,0.000,0.000]

[G57:0.000,0.000,0.000]

[G58:0.000,0.000,0.000]

[G59:0.000,0.000,0.000]

[G28:0.000,0.000,0.000]

[G30:0.000,0.000,0.000]

[G92:0.000,0.000,0.000]

[TLO:0.000]

[PRB:0.000,0.000,0.000:0]

ok

<Alarm|MPos:0.000,0.000,0.000|FS:0,0|Pn:Y|LI:-1.00>

[MSG:Machine tilt sensor initialization successful!]

<Alarm|MPos:0.000,0.000,0.000|FS:0,0|Pn:Y|LI:-1.00>

Starting stream

Error:9

G-code locked out during alarm or jog state.

On or near line 1:

Error:9

G-code locked out during alarm or jog state.

On or near line 1:

Error:9

G-code locked out during alarm or jog state.

On or near line 1:

Stream completed in 0:00

Error:9

G-code locked out during alarm or jog state.

Error:9

G-code locked out during alarm or jog state.

<Alarm|MPos:0.000,0.000,0.000|FS:0,0|Pn:Y|WCO:0.000,0.000,0.000|LI:-1.00>

Starting stream

Error:9

G-code locked out during alarm or jog state.

On or near line 1:

Error:9

G-code locked out during alarm or jog state.

On or near line 1:

Error:9

G-code locked out during alarm or jog state.

On or near line 1:

Stream completed in 0:00

Error:9

G-code locked out during alarm or jog state.

Error:9

G-code locked out during alarm or jog state.

[MSG:Bluetooth Module initialization successful!]

<Alarm|MPos:0.000,0.000,0.000|FS:0,0|Pn:Y|Ov:100,100,100|LI:-1.00>

Starting stream

Error:9

G-code locked out during alarm or jog state.

On or near line 1:

Error:9

G-code locked out during alarm or jog state.

On or near line 1:

Error:9

G-code locked out during alarm or jog state.

On or near line 1:

Stream completed in 0:00

Error:9

G-code locked out during alarm or jog state.

<Alarm|MPos:0.000,0.000,0.000|FS:0,0|LI:-1.00>

ok

<Idle|MPos:0.000,0.000,0.000|FS:0,0|LI:-1.00>

ok

Starting stream

Stream completed in 0:00

[MSG:Y Limit switch triggered]

ALARM:1

Hard limit triggered. Machine position is likely lost due to sudden and immediate halt. Re-homing is highly recommended.

[MSG:Hard Limit]

[MSG:Reset to continue]

Grbl 1.3a [‘$’ for help]

[MSG:Y Limit triggered]

[MSG:Check limits]

[MSG:‘$H’|‘$X’ to unlock]

Grbl 1.3a [‘$’ for help]

[MSG:Y Limit triggered]

[MSG:Check limits]

[MSG:‘$H’|‘$X’ to unlock]

[MSG:Caution: Unlocked]

ok

<Idle|MPos:-0.570,-5.080,0.000|FS:0,0|Pn:Y|LI:-1.00>

ok

<Idle|MPos:-0.570,-5.080,0.000|FS:0,0|Pn:Y|LI:-1.00>

Dskall · October 20, 2026, 11:56pm

Have you rehomed it? Do you move it or change any settings since then?

Busyone · October 21, 2026, 12:11am

I rehomed it and it seems to be working again. I had another query about the small green square and discovered I had switched Absolute Coordinates off.

I tried and my first attempt worked for a minute, then I got Alarm 9.

Tring a second attempt.

Thanks for now, If I have any further issues, I come back to this string.

Keith

MikeyH · October 21, 2026, 1:13am

Can you upload your Lightburn (.lbrn2) design file? It looks like whatever your is doing is exceeding a Yaxis limit.