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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.

505

Firmware Upgrade Failed

Huawei · SUN2000 8-28KTL Solar Inverter

What does 505 mean?

A major fault indicating that a firmware upgrade process was incomplete, which can leave the SUN2000 in an inoperable state. The inverter cannot function correctly without a complete and valid firmware.

Common Causes

  • The upgrade process is incomplete.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Perform the firmware upgrade again.

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