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: March 2026

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Source: Huawei SUN2000-(3KTL-10KTL)-M1 Solar Inverter