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

Alarm 2102Protection upon Communication Failure

Name in the manufacturer's documentation (fault list): Protection upon Communication Failure[1]

In plain words (editorial)

Protection upon communication failure: communication was lost longer than the set threshold, so the inverter shut down. After communication is restored, it recovers when it receives a scheduling command.

When to call a service technician: Have your installer check the communication cable (or disable the function if it is not required).

✎ 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. 96 official manufacturer document quote verified 2102 Protection upon Communication Failure
  2. [2] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 96 official manufacturer document quote verified when the disconnection of communication exceeds the specified time threshold, the device starts the protection function.
  3. [3] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 96 official manufacturer document quote verified check whether the communications cable is connected properly.
  4. [4] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 96 official manufacturer document quote verified if the protection upon communication failure function is not required, disable it.
  5. [5] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 96 official manufacturer document quote verified the device is shut down.
  6. [6] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 96 official manufacturer document quote verified after communication is restored, the device will recover upon receiving a scheduling command.