# GSender Z-probe goes up to endstop instead of probing downward

**URL:** <https://forum.sienci.com/t/gsender-z-probe-goes-up-to-endstop-instead-of-probing-downward/26459>\
**Category:** ❓ Something's Up\
**Created:** [May 25, 2026, 6:21pm UTC](https://forum.sienci.com/t/gsender-z-probe-goes-up-to-endstop-instead-of-probing-downward/26459 "2026-05-25T18:21:11Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Fonzie](https://forum.sienci.com/letter_avatar_proxy/v4/letter/f/47e85d/32.png) [@Fonzie](https://forum.sienci.com/u/Fonzie)\
**Post date:** [May 25, 2026, 6:21pm UTC](https://forum.sienci.com/t/gsender-z-probe-goes-up-to-endstop-instead-of-probing-downward/26459/1 "2026-05-25T18:21:12Z")

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Good day,

I’m trying to switch from UGS to GSender, but I’m having an issue with the Z-probe function. When I initiate probing in GSender, the Z-axis moves **upward** until it hits the endstop and then stops, instead of moving down toward the probe block.

In UGS I use the following G-code for probing, which works correctly:

```auto
G21 G91 G38.2 Z-30 F100
G0 Z1
G38.2 Z-2 F10
G0 Z10 F20
G92 Z30.4

```

**My setup:**

- Machine: X6-1500 router

- Controller: FluidNC controller board

Greetings Fonzie

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**Author:** ![StephenCampbell](https://forum.sienci.com/user_avatar/forum.sienci.com/stephencampbell/32/6018_2.png) [@StephenCampbell](https://forum.sienci.com/u/StephenCampbell)\
**Post date:** [May 26, 2026, 12:24pm UTC](https://forum.sienci.com/t/gsender-z-probe-goes-up-to-endstop-instead-of-probing-downward/26459/2 "2026-05-26T12:24:12Z")

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Welcome aboard @Fonzie,

Great question! If you head into the Config tab in gSender, then select the probe section, you will find that you can invert your probe direction with a toggle switch.

 ![invert probe](https://forum.sienci.com/uploads/default/original/2X/b/b3088b930f593fc1251f883b06f1a85f73e9de91.jpeg)

Try to flip that setting, then hit the “Apply Settings” button in the bottom right to save your new setting. To see more details on how you can use the probe function in gSender, head over to [Probing](https://resources.sienci.com/view/gs-using-gsender/#probing)

Cheers,  
Stephen

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**Author:** ![Fonzie](https://forum.sienci.com/letter_avatar_proxy/v4/letter/f/47e85d/32.png) [@Fonzie](https://forum.sienci.com/u/Fonzie)\
**Post date:** [May 27, 2026, 1:14pm UTC](https://forum.sienci.com/t/gsender-z-probe-goes-up-to-endstop-instead-of-probing-downward/26459/3 "2026-05-27T13:14:06Z")

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Thank you Stehan, that fixed it!

Greetings Fonzie

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**Author:** ![gwilki](https://forum.sienci.com/user_avatar/forum.sienci.com/gwilki/32/366_2.png) [@gwilki](https://forum.sienci.com/u/gwilki)\
**Post date:** [May 27, 2026, 3:57pm UTC](https://forum.sienci.com/t/gsender-z-probe-goes-up-to-endstop-instead-of-probing-downward/26459/4 "2026-05-27T15:57:02Z")

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