Partner Academy · EcoBSS / FLEX
Fault
3P HV
F12
AC_SlaveContactor_Failure
AC auxiliary contactor failure
Academy field checklist (AC_SlaveContactor_Failure) — no EcoBSS service-table row for this bit.
Register map
- Family
- Three-phase HV
- Register
- 555
- Bit
- 11
Field checks
- Check auxiliary / bypass contactor wiring and feedback the same way as the main contactor.
- Confirm the control sequence is not commanding an impossible state.
- Contact Inversol if the fault returns after a clean power cycle.
FAQ
What does EcoBSS F12 mean?
AC auxiliary contactor failure
What should I check for EcoBSS F12?
- Check auxiliary / bypass contactor wiring and feedback the same way as the main contactor.
- Confirm the control sequence is not commanding an impossible state.
- 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).