The error message M-FCT 3 is an error message generated by the spindle control.

It is usually triggered by the temperature monitoring.

If this error occurs, the spindle temperature should first be checked. If the spindle is not unusually hot, the possible reason is that a cable break has occurred.

Restarting the machine resets the error and you can continue to work for the time being; if it occurs again, contact Support.

The error can be narrowed down more precisely via remote maintenance and then remedied by taking the appropriate measures.