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

STATE 520No energy fed into the grid by MPPT1 in the past 24 hours

Name in the manufacturer's documentation (service manual): No energy fed into the grid by MPPT1 in the past 24 hours[1]

In plain words (editorial)

MPP tracker 1 has not fed any energy into the grid in the past 24 hours – a warning on the display. The manual says to acknowledge the code and check whether all conditions for feeding energy are met (e.g. whether the solar modules are covered with snow).

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. 49 manufacturer document – copy from a distributor quote verified 520 No energy fed into the grid by
  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. 5 official manufacturer document quote verified Acknowledge status code; check whether all the conditions for the problem-free feeding of energy into the grid have been met (e.g. are the solar modules covered with snow?)
  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. 5 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. 5 official manufacturer document quote verified Warning message is shown on the display