Partner Academy · EcoBSS / FLEX
Fault
3P LV
F37
AC_Volt_Unbalance_Fault
AC voltage unbalance
Academy field checklist (AC_Volt_Unbalance_Fault) — no EcoBSS service-table row for this bit.
Register map
- Family
- Three-phase LV (FLEX 3L)
- Register
- 557
- Bit
- 4
Field checks
- Measure phase-to-phase and phase-to-neutral voltages; look for a lost phase or heavy single-phase load.
- Correct site imbalance before blaming the inverter.
- Contact Inversol if the fault returns after a clean power cycle.
FAQ
What does EcoBSS F37 mean?
AC voltage unbalance
What should I check for EcoBSS F37?
- Measure phase-to-phase and phase-to-neutral voltages; look for a lost phase or heavy single-phase load.
- Correct site imbalance before blaming the inverter.
- 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).