Getting an error not had before

Seems will engrave good part then all of a sudden just stops ive checked the wiring nothing wrong only thing ive done is moved the laser to a more ventilated bit of the room this is an ortur 2 system 15w
It will burn the noard itbsits on no problem but if i put another board under it will not fully burn

Here is the warning bit
can someone give me some idea why im getting a failed engrave
heres the fail bit ive checked every thing looks ok
seems only since i moved the laser to another part of the room where its more vented
Homing
ALARM:8
Homing fail. Cycle failed to clear limit switch when pulling off. Try increasing pull-off setting or check wiring.
ok
Ortur Laser Master 2 Ready!
OLF 137.
Grbl 1.1f [’$’ for help]
[MSG:Check Limits]
[MSG:’$H’|’$X’ to unlock]
[MSG:Caution: Unlocked]
ok

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