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Fronius · PV inverters · Fronius Symo 3.0–20.0 (three-phase grid inverter, SnapINverter)

STATE 445Compatibility error / invalid power stage set configuration

Name in the manufacturer's documentation (fault list): Compatibility error / invalid power stage set configuration[1]

In plain words (editorial)

Compatibility error or invalid configuration of the power stage set. The inverter is not feeding any energy into the grid. The manual recommends updating the inverter firmware.

When to call a service technician: If the code is displayed all the time, notify a Fronius-trained service technician.

✎ editorial – written from the cited sources, not a manufacturer statement. Status: draft.

The Polish page has more detail (plain-language explanation, safe checks, guides): Read in Polish →

Sources

Every statement has a footnote to the document and PDF page. “Quote verified” means the quote was found automatically in the text of that page.

  1. [1] Fronius Symo 3.0-3 – 20.0-3, Fronius Eco 25.0-3 – 27.0-3 – Operating Instructions (42,0410,2028, ed. 016-24082016) – distributor copy (42,0410,2028 (016-24082016)) , p. 47 manufacturer document – copy from a distributor quote verified Compatibility error (e.g. due to re
  2. [2] Fronius Symo / Fronius Eco – Operating Instructions (e-Manual HTML), Version 044-17072025 – chapter “Status diagnostics and troubleshooting” (text capture) (e-Manual 4204101909, 044-17072025) , p. 4 official manufacturer document quote verified Update inverter firmware
  3. [3] Fronius Symo / Fronius Eco – Operating Instructions (e-Manual HTML), Version 044-17072025 – chapter “Status diagnostics and troubleshooting” (text capture) (e-Manual 4204101909, 044-17072025) , p. 4 official manufacturer document quote verified If the status code is displayed all the time: notify a Fronius-trained service technician
  4. [4] Fronius Symo / Fronius Eco – Operating Instructions (e-Manual HTML), Version 044-17072025 – chapter “Status diagnostics and troubleshooting” (text capture) (e-Manual 4204101909, 044-17072025) , p. 4 official manufacturer document quote verified The inverter is not feeding any energy into the grid.