# Z-min Switch Error

The Z-min switch is used orient the probe in 3D space, and is an important and required part of setting up a successful print.

`Unable to move to`` ``z``-switch (``z``-``min``), switch did not trigger`\
\
`Unable to measure at z-switch (z-min), switch did not trigger during initial approach`\
\
`Unable to home z-axis, could not measurez-switch (z-min)`\
\
`Unable to retract from`` ``z``-switch (``z``-``min``), switch did not release during retract movement`

If you've received any of the above errors mentioning the Z-min switch, the first step is to test the actuation of the switch itself. 

Using the eraser end of a pencil, or your finger, check the movement by actuating it and verifying that it can move up and down.

<figure><img src="/files/IKnYZ4rAWxyF6r1hZ8fe" alt=""><figcaption></figcaption></figure>

{% hint style="warning" %}
If the Z-min switch appears to be sticking, or has visible ink, paste or debris on or around it, try cleaning it using isopropyl alcohol and a cotton swab (Q-tip).
{% endhint %}

Next, with the printer connected and probe mounted, use `ALT+C` or `~` in the software to open the console. Use the `D2` command to check the status of all of the switches on the machine. Your output should look like the screenshot below.

<figure><img src="/files/m38DXTYiFJv4tiJVvVw5" alt=""><figcaption></figcaption></figure>

Finally, hold down the Z-min switch with your pencil or finger, and while it's depressed, run the `D2` command once again. Your output should now show the z-switch is triggered.

<figure><img src="/files/3H3JQfypRMO7c3bzpdHs" alt=""><figcaption></figcaption></figure>

If these tests are all as expected and you continue to receive errors while using the printer, please take a screenshot of the `D2` test and reach out to our [support team](mailto:support@voltera.io).


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