I have a spindle that has been working until today. The spindle will start when I hit the spindle control in Mach3 and then (not immediately) shut down. I get an HoC code on the front of the VFD. I removed the wire connection to the top of the spindle and ran the spindle with Mach3 again. I can get it up to 400 and back down without any code. I assume this means that my spindle is bad but why would it startup in the first place.

Can anyone tell me if the spindle is truly bad and if I need to replace or is it something else?

I tried everything to post the video but I was unable. So here is a link to the video

https://drive.google.com/file/d/1_V9...ew?usp=sharing