What does error 64 mean on a Voltronic inverter?

64 means: R Inv Cur HW Over. Surge.

Voltronic inverter error 64

R Inv Cur HW Over

Fault — the inverter cuts its output and the red LED stays solid until the fault is cleared.

InverterFault

R Inv Cur HW Over — Fault code 64 shown on the display with the fault icon on: R Inv Cur HW Over.

Cause: Surge.

Source: InfiniSolar-TX-PA_manual.pdf, p.52

What does error 64 mean on a Voltronic inverter?: 64 means: R Inv Cur HW Over. Surge.
Is error 64 a fault or a warning?: 64 is a fault code: the inverter cuts its output and the red LED stays solid until it is cleared.
How do I clear or fix error 64?: 1. Restart the inverter.

Compiled from official Voltronic user manuals. Always consult your device manual and a qualified technician before performing repairs.