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ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

601

Grid fault

SMA · Sunny Boy Solar Inverter

What does 601 mean?

The inverter has detected an excessively high proportion of direct current (DC) in the grid current. This can indicate an issue with grid quality or external DC sources influencing the AC grid, potentially harming connected equipment.

Common Causes

  • Excessively high proportion of direct current in the grid current.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the grid connection for the presence of direct current.

  2. 2

    If this message displays frequently, contact the grid operator to check if the inverter's monitoring threshold can be raised.

Browse all codes in this manual (23)
Verified technical data. Last updated: April 2026

Related Faults

101Grid fault10252[Interface]: communication disrupted10253[Interface]: connection speed goes to [100 Mbit / 10 Mbit]
Source: SMA Sunny Boy Solar Inverter
Open Manual (Page 65)Search more codes in this manual