Partner Academy · EcoBSS / FLEX
Fault
3P HV
F35
AC_NoUtility_Fault
No utility / grid voltage at AC terminals
Academy field checklist (AC_NoUtility_Fault) — no EcoBSS service-table row for this bit.
Register map
- Family
- Three-phase HV
- Register
- 557
- Bit
- 2
Field checks
- Measure GRID terminal voltage; confirm upstream breaker / isolator is closed.
- If off-grid is intentional, check mode settings so the unit is not waiting for utility.
- Contact Inversol if the fault returns after a clean power cycle.
FAQ
What does EcoBSS F35 mean?
No utility / grid voltage at AC terminals
What should I check for EcoBSS F35?
- Measure GRID terminal voltage; confirm upstream breaker / isolator is closed.
- If off-grid is intentional, check mode settings so the unit is not waiting for utility.
- Contact Inversol if the fault returns after a clean power cycle.
When should I contact Inversol?
Confirm LV vs HV family on the nameplate, complete the field checks, then contact Inversol with model, SN, family, and a photo if the code returns after a clean power cycle.
Partner lookup from EcoBSS Flex register map V1.2 — not a substitute for the official service manual or live measurements. Always match the inverter family (3P LV / FLEX 3L vs 3P HV).