The actual car speed (measured by the governor or encoder) exceeds the commanded speed from the VFD by more than 15% for more than 100 milliseconds.
If the elevator is stuck, a Single Reset (pressing the reset button on the GCIOCF PCBA once) or a Double Reset (waiting for the red LED to go out before pressing again) is often the first step in clearing non-fatal errors. schindler 5500 error codes top
Unlike older hydraulic units, the 5500 hates "dirty" power. vanish after verifying the grounding on the controller cabinet and checking the phase monitor relay. The actual car speed (measured by the governor