Huawei · PV inverters · Huawei SUN2000-KTL-M1 (three-phase inverter, 3–10 kW, battery-ready)
Alarm 2072Transient AC overvoltage
Name in the manufacturer's documentation (fault list): Transient AC overvoltage
[1]
In plain words (editorial)
A phase voltage exceeded the transient AC overvoltage protection threshold.
When to call a service technician: If it happens frequently, contact your installer – the grid values may need to be checked with the local power operator; protection thresholds may only be changed with the operator's consent.
✎ editorial – written from the cited sources, not a manufacturer statement. Status: draft.
For technicians
Possible causes (source text)
- The device detects that the phase voltage exceeds the transient ac overvoltage protection threshold.[2]
Steps given by the manufacturer (source text)
- Check whether the voltage at the grid connection point exceeds the upper threshold. if yes, contact the local power operator.[3]
- If you have confirmed that the voltage at the grid connection point exceeds the upper threshold, modify the overvoltage protection threshold after obtaining the consent of the local power operator.[4]
- Check whether the peak grid voltage exceeds the upper threshold.[5]
⚠ 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. 66 official manufacturer document quote verified
2072 Transient AC overvoltage
- [2] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 66 official manufacturer document quote verified
the device detects that the phase voltage exceeds the transient ac overvoltage protection threshold.
- [3] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 66 official manufacturer document quote verified
check whether the voltage at the grid connection point exceeds the upper threshold. if yes, contact the local power operator.
- [4] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 66 official manufacturer document quote verified
if you have confirmed that the voltage at the grid connection point exceeds the upper threshold, modify the overvoltage protection threshold after obtaining the consent of the local power operator.
- [5] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 66 official manufacturer document quote verified
check whether the peak grid voltage exceeds the upper threshold.