What happened?

The printer is showing the message "Power panic situation detected".

Most likely, the error is not caused by a hardware fault in the AC controller box, but by a firmware issue. 

Error name: AC controller fault

Error code: #35333

How to fix it?

Perform a Hard reset (USB with FW needed) from the Factory reset (CORE One L, CORE One, MK4/S, MK3.9/S, MK3.5/S, MINI/+, XL) article, with the latest firmware on the root folder of the USB drive. 

If the issue persists, contact our Customer support.