
Universal Robots C163A4
Wrist 2 joint. Something is wrong in the application. Recurring protective stops should be resolved, ignoring it can void warranty.
Cause, as the directory gives them
- Frequent protective stops is an indication of either an error in the application, or a hardware failure in a joint.
From Universal Robots’s own error code directory. The steps to fix it are the maker’s and are on the page linked above, not copied here.