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

Alarm 2064Device Abnormal

Name in the manufacturer's documentation (fault list): Device Abnormal[1]

In plain words (editorial)

A major internal fault of the inverter, or a protective shutdown caused by external factors such as the grid. The inverter shuts down. The manual gives strict instructions: if the DC switch is off, do not turn the AC or DC switch on; do not issue a reset command; do not stand in front of the inverter during maintenance.

When to call a service technician: Contact your vendor or Huawei technical support.

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

For technicians

Possible causes (source text)

A major fault has occurred on the internal circuit of the device.[2]
The device is faulty or protected due to external factors such as the power grid.[3]

Steps given by the manufacturer (source text)

If dc switch is off, do not turn on the ac or dc switch. (if the 20 device appearance is abnormal, remove the dc terminals after the pv string current decreases to below 0.01 a.) contact your vendor or technical support.[4]
If dc switch is on, wait until the dc current has decreased to less than 0.01 a on the same day, turn off the ac and dc switches, disconnect the dc side, and contact your vendor or technical support. do not turn on the dc switch or issue a reset command.[5]
Turn off the ac and dc switches, and check whether the 13-19 harmonics from the power grid and the insulation of input and output power cables are normal.[6]
If the power grid and cable insulation are normal, turn on the ac and dc switches 5 minutes later. if the fault persists, contact your vendor or technical support.[7]
If the device appearance is abnormal, turn off the ac and dc switches, wait until the pv string current decreases to below 0.01 a, and remove the dc terminals.[8]
If dc switch is off, do not turn on the ac or dc switch. (if the device appearance is abnormal, remove the dc terminals after the pv string current decreases to below 0.01 a.) contact your vendor or technical support.[9]
Wait until the dc current has decreased to less than 0.01 a on the same day, turn off the ac and dc switches, disconnect the dc side, and contact your vendor or technical support. do not turn on the dc switch or issue a reset command.[10]
Turn off the ac and dc switches, and check whether the harmonics from the power grid and the insulation of input and output power cables are normal.[11]

What the device does (source text)

The device is shut down.[12]

Notes from the documentation

Do not stand in front of the inverter during maintenance. if an emergency such as fault spreading occurs, handle it by referring to the smart pv plant emergency plan.[13]

⚠ Work on refrigerant circuits, mains electricity and PV DC wiring is for qualified technicians only.

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] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 56 official manufacturer document quote verified 2064 Device Abnormal
[2] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 56 official manufacturer document quote verified a major fault has occurred on the internal circuit of the device.
[3] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 56 official manufacturer document quote verified the device is faulty or protected due to external factors such as the power grid.
[4] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 57 official manufacturer document quote verified if dc switch is off, do not turn on the ac or
[5] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 57 official manufacturer document quote verified if dc switch is on, wait until the dc current has decreased to less than 0.01 a on the same day, turn off the ac and dc switches, disconnect the dc side, and contact your vendor or technical support. do not turn on the d…
[6] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 57 official manufacturer document quote verified turn off the ac and dc switches, and check whether the 13-19 harmonics from the power grid and the insulation of input and output power cables are normal.
[7] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 57 official manufacturer document quote verified if the power grid and cable insulation are normal, turn on the ac and dc switches 5 minutes later. if the fault persists, contact your vendor or technical support.
[8] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 57 official manufacturer document quote verified if the device appearance is abnormal, turn off the ac and dc switches, wait until the pv string current decreases to below 0.01 a, and remove the dc terminals.
[9] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 57 official manufacturer document quote verified if dc switch is off, do not turn on the ac or dc switch. (if the device appearance is abnormal, remove the dc terminals after the pv string current decreases to below 0.01 a.) contact your vendor or technical support.
[10] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 57 official manufacturer document quote verified wait until the dc current has decreased to less than 0.01 a on the same day, turn off the ac and dc switches, disconnect the dc side, and contact your vendor or technical support. do not turn on the dc switch or issue a …
[11] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 57 official manufacturer document quote verified turn off the ac and dc switches, and check whether the harmonics from the power grid and the insulation of input and output power cables are normal.
[12] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 56 official manufacturer document quote verified the device is shut down.
[13] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 57 official manufacturer document quote verified do not stand in front of the inverter during maintenance. if an emergency such as fault spreading occurs, handle it by referring to the smart pv plant emergency plan.