FLA48200/FLA48300/FLA48500 and LUX-Y low-voltage LiFePO4 batteries (BMS fault code list)
Felicity C11 error code
Abnormal current sampling: the BMS current measurement is implausible.
Likely causes
- BMS current sensor fault
- Damaged sensor harness inside the pack
- Control-board fault
Checks to run, in order
- 1Restart the unit and see whether the code clears
- 2Clamp the battery cable and compare with the BMS current reading
- 3Check for recent cable or terminal work on the battery
Fixes
- Restart the unit; if the error persists, contact the repair centre
- Do not rely on the BMS current reading until it is repaired
When to escalate
C11 is an internal BMS measurement fault - escalate to the distributor or repair centre.
Fix it with the right tools
Check the system around the fault before replacing parts: load, battery bank, PV string and commissioning settings. If you need a second opinion, send the code and your inverter model to our team.
Before you open the inverter
- Isolate both the AC and DC sides, then confirm the display is dead before touching terminals.
- Use insulated tools and one hand where possible. DC arcs do not self-extinguish like AC.
- If you see burnt terminals, swollen cells, leaking electrolyte or a burning smell, stop and escalate instead of resetting the fault.
Questions installers ask
What does Felicity C11 mean?
Abnormal current sampling: the BMS current measurement is implausible.
How do I fix Felicity C11?
Restart the unit; if the error persists, contact the repair centre Do not rely on the BMS current reading until it is repaired
When should I escalate Felicity C11?
C11 is an internal BMS measurement fault - escalate to the distributor or repair centre.
Can I reset Felicity C11 myself?
Only after isolating the AC and DC sides and running the checks above. If Felicity C11 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Felicity C11?
Felicity C11 is documented for FLA48200/FLA48300/FLA48500 and LUX-Y low-voltage LiFePO4 batteries (BMS fault code list). Confirm the code on your own unit's display or manual before ordering parts.
More Felicity error codes
- Felicity 04Low cell voltage / over-discharge protection.
- Felicity 05PV over-current fault: the PV input current exceeded the inverter's PV input limit.
- Felicity 18PV short-circuit fault on the PV input; in the warning list the same number means battery under-voltage alarm.
- Felicity 19Battery open-circuit alarm: the inverter no longer detects a battery on its terminals.
- Felicity 20Battery SOC low alarm: the battery's state of charge has fallen to the low-SOC warning threshold.
- Felicity 21BMS communication alarm: abnormal communication between battery and inverter in non-SOC mode.
Guidance reviewed 17 October 2026 by the Mishka Energy installer team. Error codes vary by brand, model family and firmware; confirm against the manufacturer manual.
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