F55 is a rare fault condition that is usually attributed to a sudden loss of DC, i.e. tripping the DC breaker.
Another known cause is AC interference caused by routing Xanbus cables near AC conductors. Make sure all equipment is properly grounded
and route the Xanbus cables thru the shielded raceway at the bottom of the conduit box. F55 indicates a data corruption in the user configuration that has caused the inverter to return to factory defaults.
Check and restore your configuration in the inverter. If the error persists, contact Schneider Electric for additional support: 866-519-1470