Huawei · PV inverters · Huawei SUN2000-KTL-M1 (three-phase inverter, 3–10 kW, battery-ready)
Alarm 4000Inverter Communication Error
Name in the manufacturer's documentation (fault list): Inverter Communication Error
[1]
In plain words (editorial)
Communication error with an inverter – the cable connection between the SmartAssistant and the inverter, or the device's communication cable, is abnormal. If the inverter was powered off, the alarm clears automatically once it is powered on.
When to call a service technician: Have your installer check the communication cables.
✎ 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)
- Access the device monitoring menu on the app and locate the inverter experiencing abnormal communication based on the device status indicator. in a parallel system, you can also use the connection test function to determine which inverter communicates abnormally.[4]
- Check whether the inverter is powered on. if it is powered off, the alarm will be automatically cleared after it is powered on. if it is powered on, check whether the cable connection between the inverter and the smartassistant is normal. if the fault persists, contact your vendor or technical support.[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. 109 official manufacturer document quote verified
4000 Inverter Communication Error
- [2] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 109 official manufacturer document quote verified
the cable connection between the smartassistant and inverter is abnormal.
- [3] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 109 official manufacturer document quote verified
the communications cable of the device is abnormal.
- [4] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 109 official manufacturer document quote verified
access the device monitoring menu on the app and locate the inverter experiencing abnormal communication based on the device status indicator. in a parallel system, you can also use the connection test function to determ…
- [5] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 109 official manufacturer document quote verified
check whether the inverter is powered on. if it is powered off, the alarm will be automatically cleared after it is powered on. if it is powered on, check whether the cable connection between the inverter and the smartas…