Internal fault (e.g. startup)

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The Fronius Primo GEN24 208-240 inverter has detected an internal fault during its startup sequence. This means the inverter is unable to complete its initialization process and begin normal operation.

• Internal fault (e.g. startup).

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1. 1

   Perform a complete power cycle of the Fronius Primo GEN24 208-240 inverter: Open the AC circuit breaker, then the DC disconnector, wait for at least 5 minutes, and then reclose them in reverse order (DC first, then AC).

2. 2

   Ensure that both AC grid voltage and DC PV voltage are stable and within their specified operating ranges upon inverter startup.

3. 3

   Check for any external communication cables (e.g., Smart Meter, battery) that might be miswired or causing conflicts during startup; temporarily disconnect non-essential comms if possible.

4. 4

   Review the inverter's event log for any other transient errors that might have occurred just before or during the startup failure.

5. 5

   If the fault persists after multiple power cycles and external checks, this indicates a serious internal hardware or software issue preventing startup; contact Fronius service.