GoodWe · PV inverters · GoodWe ET G2 6–15 kW (three-phase hybrid inverter)
F28Parallel I/O Self-Check Abnormal
Name in the manufacturer's documentation (user manual): Parallel I/O Self-Check Abnormal
[1]
In plain words (editorial)
Parallel system I/O self-check failed – the parallel communication cable is not securely connected, or the parallel I/O chip is damaged.
When to call a service technician: Have your installer check the parallel communication cable.
✎ editorial – written from the cited sources, not a manufacturer statement. Status: draft.
For technicians
Possible causes (source text)
- Parallel communication cable is not securely connected or the parallelIOchip is damaged[2]
Steps given by the manufacturer (source text)
- Check whether the parallel communication cable is securely connected, then check whether theIOchip is damaged; if so, replace theIOchip[3]
⚠ 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] GoodWe Residential Smart Inverter Solutions – ET G2 6-15K (+ LX F / LX D) – User Manual V2.2 (2026-09-30) (V2.2-2026-09-30) , p. 201 official manufacturer document quote verified
- [2] GoodWe Residential Smart Inverter Solutions – ET G2 6-15K (+ LX F / LX D) – User Manual V2.2 (2026-09-30) (V2.2-2026-09-30) , p. 201 official manufacturer document quote verified
Parallel communication cable is not securely connected or the parallelIOchip is damaged
- [3] GoodWe Residential Smart Inverter Solutions – ET G2 6-15K (+ LX F / LX D) – User Manual V2.2 (2026-09-30) (V2.2-2026-09-30) , p. 201 official manufacturer document quote verified
Check whether the parallel communication cable is securely connected, then check whether theIOchip is damaged; if so, replace theIOchip