SolarEdge · PV inverters · SolarEdge SE3K–SE10K (three-phase inverter with power optimizers, SetApp)
Error 3x9EThe device is locked, due to either human intervention, or automatically due to one or more safety features.
Name in the manufacturer's documentation (fault list): The device is locked, due to either human intervention, or automatically due to one or more safety features.
[1]
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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] SolarEdge Inverters Error Codes and Troubleshooting – User Guide (Version 1.2, 2026-09) (se-inverter-installation-guide-error-codes (v1.2)) , p. 8 official manufacturer document quote verified
3x9E The device is locked, due to either
- [2] SolarEdge Inverters Error Codes and Troubleshooting – User Guide (Version 1.2, 2026-09) (se-inverter-installation-guide-error-codes (v1.2)) , p. 8 official manufacturer document quote verified
Need to know why the system locked in the first place
- [3] SolarEdge Inverters Error Codes and Troubleshooting – User Guide (Version 1.2, 2026-09) (se-inverter-installation-guide-error-codes (v1.2)) , p. 8 official manufacturer document quote verified
OFF/ON to Reconnect
- [4] SolarEdge Inverters Error Codes and Troubleshooting – User Guide (Version 1.2, 2026-09) (se-inverter-installation-guide-error-codes (v1.2)) , p. 8 official manufacturer document quote verified
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