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

STATE 103AC voltage too low

Name in the manufacturer's documentation (service manual): AC voltage too low[1]

In plain words (editorial)

The grid voltage is too low for the inverter. The inverter stops feeding energy into the grid and resumes on its own once the grid conditions are back within the permissible range. The manual says to check the grid connections.

When to call a service technician: If the code keeps recurring, contact your system installer.

✎ 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. 45 manufacturer document – copy from a distributor quote verified 103 AC voltage too low
  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. 2 official manufacturer document quote verified Check grid connections; if this status code keeps recurring, contact your system fitter
  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. 2 official manufacturer document quote verified Following careful testing and when the grid conditions are within the permissible range again, the inverter will resume feeding energy into the grid.