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Huawei · PV inverters · Huawei SUN2000-KTL-M1 (three-phase inverter, 3–10 kW, battery-ready)

Alarm 2003DC Arc Fault

Name in the manufacturer's documentation (fault list): DC Arc Fault[1]

In plain words (editorial)

The inverter detected an electric arc on the DC side – the manual names arcing or poor contact in the PV string cables. The alarm ID identifies the affected string; burn marks, loose or badly crimped terminals and damaged cables are what to look for.

When to call a service technician: Do not touch the DC cabling yourself – have an installer inspect it. If the alarm persists, the manual says to export the logs and contact technical support.

✎ editorial – written from the cited sources, not a manufacturer statement. Status: draft.

The Polish page has more detail (plain-language explanation, safe checks, guides): Read in Polish →

Sources

Every statement has a footnote to the document and PDF page. “Quote verified” means the quote was found automatically in the text of that page.

  1. [1] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 17 official manufacturer document quote verified 2003 DC Arc Fault
  2. [2] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 17 official manufacturer document quote verified the pv string cables generate arcs or are in poor contact
  3. [3] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 17 official manufacturer document quote verified identify the abnormal pv string based on the alarm id
  4. [4] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 17 official manufacturer document quote verified traces of ignition, poor contact of terminals, poor crimping of cables, and cable damage
  5. [5] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 17 official manufacturer document quote verified if the alarm persists after troubleshooting, manually clear the alarm
  6. [6] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 17 official manufacturer document quote verified if the alarm persists, export logs and contact technical support