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SolarEdge · PV inverters · SolarEdge SE3K–SE10K (three-phase inverter with power optimizers, SetApp)

Error 18x3BIf the error flags on all three phases at the same time, there is most likely a DC related issue on site.

Name in the manufacturer's documentation (fault list): If the error flags on all three phases at the same time, there is most likely a DC related issue on site.[1]

In plain words (editorial)

If this error shows on all three phases at the same time, the manual says it is most likely a DC-related issue on site; the installer can connect one string at a time to find out whether the problem follows the strings or stays with the inverter.

When to call a service technician: Contact your installer or SolarEdge support.

✎ 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] SolarEdge Inverters Error Codes and Troubleshooting – User Guide (Version 1.2, 2026-09) (se-inverter-installation-guide-error-codes (v1.2)) , p. 24 official manufacturer document quote verified 18x3B If the error flags on all three phases at
  2. [2] SolarEdge Inverters Error Codes and Troubleshooting – User Guide (Version 1.2, 2026-09) (se-inverter-installation-guide-error-codes (v1.2)) , p. 24 official manufacturer document quote verified Try landing one string at a time to the inverter, as well as swap strings between inverters (if there are multiple inverters), to see if the issue stays with the inverter or moved with the strings
  3. [3] SolarEdge Inverters Error Codes and Troubleshooting – User Guide (Version 1.2, 2026-09) (se-inverter-installation-guide-error-codes (v1.2)) , p. 24 official manufacturer document quote verified Contact Support