Fronius · Primo GEN24 Operating Instructions
This code indicates a complete absence of an AC grid connection, preventing the inverter from feeding energy. The inverter will automatically attempt to connect again once an AC grid is detected.
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Check the AC voltage on the inverter connection sockets; it must be 220/230 V (+10% / -5%) or 380/400 V (+10% / -5%).
Verify that all AC circuit breakers leading to the inverter are closed and functional.
Inspect all AC cable connections for integrity and secure termination.