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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.

504

Version Mismatch

Huawei · SUN2000 8-28KTL Solar Inverter

What does 504 mean?

A minor fault indicating that the software version loaded during a software upgrade is incorrect. This can lead to improper inverter operation or functionality issues, but the SUN2000 may still feed electricity.

Common Causes

  • The version of the software loaded during a software upgrade is incorrect.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check whether a recent software upgrade has been performed.

  2. 2

    Upgrade the software again to the correct version.

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