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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.

400

System Fault

Huawei · SUN2000 8-28KTL Solar Inverter

What does 400 mean?

A major, unrecoverable fault has occurred on an internal circuit within the SUN2000. This indicates a serious internal hardware or software issue that prevents normal operation.

Common Causes

  • An unrecoverable fault on an internal circuit inside the SUN2000.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Flip the DC SWITCH on the SUN2000 to OFF.

  2. 2

    Wait for 5 minutes.

  3. 3

    Flip the DC SWITCH to ON and check if the fault is rectified.

Browse all codes in this manual (26)
Verified technical data. Last updated: April 2026

Related Faults

103DC Over Voltage106String 1 Abnormal107String 2 Abnormal
Source: Huawei SUN2000 8-28KTL Solar Inverter
Open Manual (Page 125)Search more codes in this manual