# Redline CNC Controller Error

**URL:** <https://forum.onefinitycnc.com/t/redline-cnc-controller-error/40387>\
**Category:** Gen 2 Elite Series\
**Created:** [October 17, 2026, 4:16pm UTC](https://forum.onefinitycnc.com/t/redline-cnc-controller-error/40387 "2026-10-17T16:16:18Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![light50cal1219](https://avatars.discourse-cdn.com/v4/letter/l/958977/32.png) [@light50cal1219](https://forum.onefinitycnc.com/u/light50cal1219)\
**Post date:** [October 17, 2026, 4:16pm UTC](https://forum.onefinitycnc.com/t/redline-cnc-controller-error/40387/1 "2026-10-17T16:16:18Z")

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I keep getting “Communication has been lost with the controller” message.

Steps Ive already taken:

-Restarted/reboot

-removed/cleaned/reseated all connectors

-Checked for update

Has anyone else ran into this problem?

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<div class="post-metadata">

**Author:** ![TMToronto](https://avatars.discourse-cdn.com/v4/letter/t/7ea924/32.png) [@TMToronto](https://forum.onefinitycnc.com/u/TMToronto)\
**Post date:** [October 17, 2026, 4:19pm UTC](https://forum.onefinitycnc.com/t/redline-cnc-controller-error/40387/2 "2026-10-17T16:19:56Z")

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Please confirm firmware version you are currently using.  
Also try a new USB cable in each of the available USB ports.

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<div class="post-metadata">

**Author:** ![OnefinityCNC](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/onefinitycnc/32/7_2.png) [@OnefinityCNC](https://forum.onefinitycnc.com/u/OnefinityCNC)\
**Post date:** [October 17, 2026, 5:16pm UTC](https://forum.onefinitycnc.com/t/redline-cnc-controller-error/40387/3 "2026-10-17T17:16:28Z")

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This is typically a emi/static issue, most commonly from your dust collection.

See: [Redline Controller Grounding FAQ](https://forum.onefinitycnc.com/t/redline-controller-grounding-faq/36045)