Partner Academy · EcoBSS / FLEX
Fault
3P LV
F46
AC_VW_UnderVolt_Fault
AC V-W line undervoltage
Academy field checklist (AC_line_UnderVolt) — no EcoBSS service-table row for this bit.
Register map
- Family
- Three-phase LV (FLEX 3L)
- Register
- 557
- Bit
- 13
Field checks
- Line undervoltage (V–W on LV map / U–V on HV map): measure the reported pair, tighten AC joints, check cable section.
- Confirm family on the nameplate so you diagnose the correct pair.
- Contact Inversol if the fault returns after a clean power cycle.
FAQ
What does EcoBSS F46 mean?
AC V-W line undervoltage
What should I check for EcoBSS F46?
- Line undervoltage (V–W on LV map / U–V on HV map): measure the reported pair, tighten AC joints, check cable section.
- Confirm family on the nameplate so you diagnose the correct pair.
- 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).