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

Alarm 61440Faulty monitoring unit

Name in the manufacturer's documentation (fault list): Faulty monitoring unit[1]

In plain words (editorial)

The monitoring unit is faulty – its flash memory is insufficient or has bad sectors, so data cannot be recorded. The manual says to turn off the AC and DC switches, wait 5 minutes and turn them back on.

When to call a service technician: If the fault persists, contact your vendor or Huawei 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. 108 official manufacturer document quote verified 61440 Faulty monitoring unit
  2. [2] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 108 official manufacturer document quote verified the flash memory is insufficient.
  3. [3] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 108 official manufacturer document quote verified the flash memory has bad sectors.
  4. [4] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 108 official manufacturer document quote verified turn off the ac switch and dc switch, wait for 5 minutes, and then turn on the ac switch and dc switch. if the fault persists, replace the monitoring board or contact your vendor or technical support.
  5. [5] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 108 official manufacturer document quote verified the flash memory of the monitoring system is unavailable, and data cannot be recorded.