GoodWe · PV inverters · GoodWe ET 5–10 kW (three-phase hybrid inverter)
FAC FailureGrid frequency is not within permissible range
Name in the manufacturer's documentation (user manual): Grid frequency is not within permissible range
[1]
In plain words (editorial)
The grid frequency is outside the range required by the inverter's safety country setting. If it appears only a few times and resolves quickly, the manual attributes it to occasional grid frequency instability.
When to call a service technician: If it persists, ask your installer to check the safety country setting and the grid.
✎ editorial – written from the cited sources, not a manufacturer statement. Status: draft.
For technicians
Detection conditions (source text)
- Inverter detects that the grid frequency is beyond the normal range required by the safety country[2]
Steps given by the manufacturer (source text)
- Make sure the safety country of the inverter is set right[3]
- If safety country is right, then please check on the inverter display if AC frequency (Fac) is within a normal range[4]
- If FAC failure only appears a few times and is resolved soon, it should be caused by occasional grid frequency unstability[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] GoodWe Hybrid Inverter ET Series | ET Plus Series – User Manual V1.1 (2021-02-10) (V1.1-2021-02-10) , p. 35 official manufacturer document quote verified
FAC Failure
- [2] GoodWe Hybrid Inverter ET Series | ET Plus Series – User Manual V1.1 (2021-02-10) (V1.1-2021-02-10) , p. 35 official manufacturer document quote verified
frequency is
- [3] GoodWe Hybrid Inverter ET Series | ET Plus Series – User Manual V1.1 (2021-02-10) (V1.1-2021-02-10) , p. 35 official manufacturer document quote verified
make sure the safety country of
- [4] GoodWe Hybrid Inverter ET Series | ET Plus Series – User Manual V1.1 (2021-02-10) (V1.1-2021-02-10) , p. 35 official manufacturer document quote verified
if safety country is right, then
- [5] GoodWe Hybrid Inverter ET Series | ET Plus Series – User Manual V1.1 (2021-02-10) (V1.1-2021-02-10) , p. 35 official manufacturer document quote verified
if fac failure only appears a