Huawei · PV inverters · Huawei SUN2000-KTL-M1 (three-phase inverter, 3–10 kW, battery-ready)
Alarm 2033Grid Undervoltage
Name in the manufacturer's documentation (fault list): Grid Undervoltage
[1]
In plain words (editorial)
The grid voltage is below the lower threshold, or low voltage has lasted longer than the ride-through (LVRT) time. The inverter shuts down and recovers automatically when the grid returns to normal; occasional alarms are a temporary grid issue.
When to call a service technician: If it happens often, the manual says to check the grid voltage and contact 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 grid voltage is below the lower threshold or the low voltage duration has lasted for more than the value specified by lvrt.[2]
Steps given by the manufacturer (source text)
- If the alarm occurs occasionally, the power grid may be abnormal temporarily. the device automatically recovers after detecting that the power grid becomes normal.[3]
- If the alarm occurs frequently, check whether the power grid voltage is within the allowed range. if not, contact the local power operator. if yes, modify the power grid undervoltage protection threshold after obtaining the consent of the local power operator.[4]
- If the fault persists for a long time, check the connection between the ac switch and power cables.[5]
What the device does (source text)
- The device is shut down.[6]
⚠ 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. 40 official manufacturer document quote verified
2033 Grid Undervoltage
- [2] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 40 official manufacturer document quote verified
the grid voltage is below the lower threshold or the low voltage duration has lasted for more than the value specified by lvrt.
- [3] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 40 official manufacturer document quote verified
if the alarm occurs occasionally, the power grid may be abnormal temporarily. the device automatically recovers after detecting that the power grid becomes normal.
- [4] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 40 official manufacturer document quote verified
if the alarm occurs frequently, check whether the power grid voltage is within the allowed range. if not, contact the local power operator. if yes, modify the power grid undervoltage protection threshold after obtaining …
- [5] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 40 official manufacturer document quote verified
if the fault persists for a long time, check the connection between the ac switch and power cables.
- [6] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 39 official manufacturer document quote verified
the device is shut down.