Skip to content

Partner Academy · EcoBSS / FLEX

Fault 3P LV F21

Tz_HV_OverCurr_Fault

DC bus / HV overcurrent fault

EcoBSS service: BUS / HV overcurrent.

Register map

Family
Three-phase LV (FLEX 3L)
Register
556
Bit
4

Field checks

  1. Check PV input current and energy-storage charge/discharge current settings.
  2. Restart the system 2–3 times.
  3. If the fault persists, contact Inversol.

FAQ

What does EcoBSS F21 mean?
DC bus / HV overcurrent fault
What should I check for EcoBSS F21?
  1. Check PV input current and energy-storage charge/discharge current settings.
  2. Restart the system 2–3 times.
  3. If the fault persists, contact Inversol.
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).

All EcoBSS codes All brands INVERSOL FLEX briefing WhatsApp support