2021

AFCI self-check failure

Huawei · SUN2000 Solar Inverter

What does 2021 mean?

The Arc-Fault Circuit Interrupter (AFCI) self-check function within the solar inverter has failed. This indicates a potential issue with the arc detection capabilities of the device, which are critical for safety in PV systems.

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.

  2. 2

    Turn on the AC output switch and DC input switch after 5 minutes.

Browse all codes in this manual (33)
Verified technical data. Last updated: March 2026

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Source: Huawei SUN2000 Solar Inverter