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

Alarm 4001App Communication Certificate Expired

Name in the manufacturer's documentation (fault list): App Communication Certificate Expired[1]

In plain words (editorial)

The app communication certificate has expired. The manual says to check whether the device time is set incorrectly (reset or synchronise it) and, if needed, apply for and load a new certificate via the vendor or technical support.

When to call a service technician: Contact your installer or vendor.

✎ 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. 111 official manufacturer document quote verified 4001 App Communication Certificate Expired
  2. [2] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 111 official manufacturer document quote verified the device time is incorrectly set.
  3. [3] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 111 official manufacturer document quote verified the certificate has expired.
  4. [4] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 111 official manufacturer document quote verified check whether the device time is incorrectly set. if yes, reset or synchronize the system time.
  5. [5] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 111 official manufacturer document quote verified contact your vendor or technical support to apply for a new certificate file and load it.