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Partner Academy · EcoBSS / FLEX

Fault 3P HV F26

BusUnbalance_Fault

DC bus unbalance fault

EcoBSS service: unbalanced DC BUS voltage.

Register map

Family
Three-phase HV
Register
556
Bit
9

Field checks

  1. Wait a short time and check whether values return to normal.
  2. Large inter-phase load imbalance can trigger F26.
  3. DC leakage current can also trigger F26.
  4. Restart the system 2–3 times.
  5. Contact Inversol if the fault does not clear.

FAQ

What does EcoBSS F26 mean?
DC bus unbalance fault
What should I check for EcoBSS F26?
  1. Wait a short time and check whether values return to normal.
  2. Large inter-phase load imbalance can trigger F26.
  3. DC leakage current can also trigger F26.
  4. Restart the system 2–3 times.
  5. Contact Inversol if the fault does not clear.
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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