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Partner Academy · EcoBSS / FLEX

Fault 3P HV F48

AC_UnderFreq_Fault

AC under-frequency fault

EcoBSS service: AC under-frequency (grid out of range).

Register map

Family
Three-phase HV
Register
557
Bit
15

Field checks

  1. Check that grid frequency is within specification.
  2. Check AC cables and their connections.
  3. Contact Inversol if the problem repeats.

FAQ

What does EcoBSS F48 mean?
AC under-frequency fault
What should I check for EcoBSS F48?
  1. Check that grid frequency is within specification.
  2. Check AC cables and their connections.
  3. Contact Inversol if the problem repeats.
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).

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