Huawei · PV inverters · Huawei SUN2000-KTL-M1 (three-phase inverter, 3–10 kW, battery-ready)
Alarm 2088Abnormal DC protection unit
Name in the manufacturer's documentation (fault list): Abnormal DC protection unit
[1]
In plain words (editorial)
Fault of the DC protection unit – the manual names a missing or blown fuse, open relays on the breaking board, stuck DC switch contacts, or an abnormal DC switch temperature.
When to call a service technician: Turn off the AC and DC switches and contact your vendor or Huawei technical support – the unit or device needs replacing.
✎ 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)
- Turn off the ac and dc switches, and contact your vendor or technical support to replace the faulty unit.[6]
- If the dc indicator on the panel is off, contact your vendor or technical support to replace the device.[7]
- If the dc indicator on the panel is on, turn off the ac and dc switches, and contact your vendor or technical support.[8]
- 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]
⚠ 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. 80 official manufacturer document quote verified
2088 Abnormal DC protection unit
- [2] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 80 official manufacturer document quote verified
the fuse is not in position or is blown.
- [3] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 80 official manufacturer document quote verified
the two relays on the breaking board are open-circuited.
- [4] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 80 official manufacturer document quote verified
the contact points of the dc switches are stuck.
- [5] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 80 official manufacturer document quote verified
the dc switch temperature is abnormal.
- [6] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 80 official manufacturer document quote verified
turn off the ac and dc switches, and contact your vendor or technical support to replace the faulty unit.
- [7] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 80 official manufacturer document quote verified
if the dc indicator on the panel is off, contact your vendor or technical support to replace the device.
- [8] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 80 official manufacturer document quote verified
if the dc indicator on the panel is on, turn off the ac and dc switches, and contact your vendor or technical support.
- [9] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 80 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.