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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.

2021

AFCI self-check failure

Huawei · SUN2000-(3KTL-10KTL)-M1 Solar Inverter

What does 2021 mean?

The Arc Fault Circuit Interrupter (AFCI) self-check function fails. This indicates a potential malfunction of a critical safety feature designed to detect and mitigate electrical arcs.

Common Causes

  • The AFCI self-check fails.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn off the AC output switch and DC input switch, then turn them on after 5 minutes.

Browse all codes in this manual (24)
Verified technical data. Last updated: April 2026

Related Faults

2001High string input voltage2002DC arc fault2003DC arc fault
Source: Huawei SUN2000-(3KTL-10KTL)-M1 Solar Inverter
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