SOFAR (Shenzhen SOFARSOLAR) · PV inverters · SOFAR 3.3–12KTLX-G3 (three-phase grid inverter)
ID42Low isolation faulty
Name in the manufacturer's documentation (user manual): Low isolation faulty
[1]
In plain words (editorial)
Low insulation (isolation) fault: the resistance of the PV strings to ground is too low, or the PV cable insulation may be damaged.
When to call a service technician: Have your installer check the PV strings and cables; if it is not resolved, contact Sofar customer service.
✎ editorial – written from the cited sources, not a manufacturer statement. Status: draft.
For technicians
Steps given by the manufacturer (source text)
⚠ 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] SOFAR 3.3~12KTLX-G3 – User Manual (2024-10) , p. 70 official manufacturer document quote verified
ID42 IsoFault Low isolation faulty
- [2] SOFAR 3.3~12KTLX-G3 – User Manual (2024-10) , p. 70 official manufacturer document quote verified
Please check whether the resistance to ground of PV string is too low and whether the insulation of
- [3] SOFAR 3.3~12KTLX-G3 – User Manual (2024-10) , p. 71 official manufacturer document quote verified
PV cable is damaged. If the use method is not ruled out, please contact the customer service of