Initialization error

Hi I just assembled my Shapeoko XXL with the Z + attachment. When I connected to the machine in carbide motion the only thing that happens is the router drops DOWN on the z axis then stops and gives me an error saying : GRBL Error: Homing Failed, couldn’t find limit switch. The router drops down stops and gives the error code.I have checked the proxy switched and they illuminate the correct lamp on the circuit board. I have checked all connections. I have tried loosening the offset wheels to allow free travel one the x and y axis. Any idea what I my be doing wrong? One question I’d ask is this; when initializing to home position, shouldn’t the router move UPWARD on the Z axis? Mine move DOWNWARD only. Again, this downward movement and the error code is the only motion the unit attempts. Thanks


Make sure you’ve sent the machine configuration:

There is a basic page on troubleshooting the homing switches at: ​ There is also a Carbide 3D Answer video:​

Please check that the switches are plugged in correctly, and work properly — when the machine powers up the homing indicator lights should flicker on/off, then once the controller is booted up you can test the switches by pressing them — the matching light should light while the switch is pressed (closed), and should go off when the switch is released (open). ​ Check that the wiring is connected properly and that all the wiring extensions and connectors are consistent. color-ordering should be consistent and all wiring extensions should be straight through.

​Please make sure that the machine can mechanically/electrically close the appropriate homing switch on an axis before reaching the limit of travel along that axis — if it can’t, it should be possible to adjust a problematic switch’s placement by loosening the hardware in question, pulling it into a better alignment and then tightening it. Note that it may be necessary to lower the Z-axis switch on a Z-Plus upon arrival (it may have been installed at the highest point to prevent damage when shipping). The machine being out of square can also affect this, squaring up the machine, or more expediently, securing a small block or plate for the homing switches to contact may be necessary.

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