Huawei · PV inverters · Huawei SUN2000-KTL-M1 (three-phase inverter, 3–10 kW, battery-ready)
Alarm 2129No Power Output for an Extended Period
Name in the manufacturer's documentation (fault list): No Power Output for an Extended Period
[1]
In plain words (editorial)
No power output for an extended period. The manual names a DC switch that is not on, PV terminals not properly connected, or extreme weather (e.g. modules covered by snow). If the DC switch is stuck between ON and OFF, do not turn it on yourself.
When to call a service technician: Check whether snow covers the modules; otherwise contact your installer or Huawei technical support.
✎ editorial – written from the cited sources, not a manufacturer statement. Status: draft.
For technicians
Possible causes (source text)
Steps given by the manufacturer (source text)
- Check whether the dc switch of the device is on. if yes: 1) check whether pv terminals of the device are disconnected. if yes, reconnect the cables. 2) check whether pv modules are blocked by snow or other objects. if yes, remove the blockage in a timely manner. 3) check whether extreme weather, such as heavy rain or polar night, exists. if yes, no special handling is required. the alarm will be automatically cleared once the irradiance recovers.[5]
- If the dc switch is off, check that the dc side is correctly connected and then turn the dc switch to the on position.[6]
- If the dc switch is in the intermediate position between on and off, contact your vendor or technical support. do not turn on the switch by yourself.[7]
- If the fault persists, contact your vendor or technical support.[8]
⚠ 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. 105 official manufacturer document quote verified
2129 No Power Output for an Extended Period
- [2] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 105 official manufacturer document quote verified
the dc switch of the device is not turned on.
- [3] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 105 official manufacturer document quote verified
pv terminals are not properly connected.
- [4] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 105 official manufacturer document quote verified
extreme weather exists.
- [5] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 106 official manufacturer document quote verified
check whether the dc switch of the device is on. if yes: 1) check whether pv terminals of the device are disconnected. if yes, reconnect the cables. 2) check whether pv modules are blocked by snow or other objects. if ye…
- [6] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 106 official manufacturer document quote verified
if the dc switch is off, check that the dc side is correctly connected and then turn the dc switch to the on position.
- [7] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 106 official manufacturer document quote verified
if the dc switch is in the intermediate position between on and off, contact your vendor or technical support. do not turn on the switch by yourself.
- [8] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 106 official manufacturer document quote verified
if the fault persists, contact your vendor or technical support.