Abnormal output impedance
Fault — the battery enters fault protection and stops normal operation until the fault is cleared — how it is shown (LED pattern or display code) depends on the model.
Severity differs by model — check your model below.
The exact meaning depends on your model:
Abnormal output impedance — Abnormal output impedance fault. LED pattern: LED1 OFF, LED2 OFF, LED3 ON, LED4 ON.
Cause: The BMS measured abnormal impedance on the battery's output path, commonly a loose or corroded output terminal connection, or a contactor or wiring issue.
Source: Felicitysolar FLA12100 12.5Kwh Battery Energy Storage System User Manual.pdf, p.1
Abnormal output impedance — Battery output impedance is abnormal.
Cause: The BMS measured abnormal impedance on the battery's output path, commonly a loose or corroded output terminal connection, or a contactor or wiring issue.
Source: Felicitysolar FLA48200 48V 200Ah 10kWh Lithium Phosphate Battery User Manual.pdf, p.13
Abnormal output impedance — BMS detected abnormal output impedance on the DC output path.
Cause: The BMS measured abnormal impedance on the battery's output path, commonly a loose or corroded output terminal connection, or a contactor or wiring issue.
Source: 6peluqppy_66a93554057c8.pdf, p.13
C12 — Abnormal output impedance.
Cause: The BMS measured abnormal impedance on the battery's output path, commonly a loose or corroded output terminal connection, or a contactor or wiring issue.
Source: FLA48250-EU_Manual.pdf, p.8
Also applies to:HE-GF-FLA-48500
Abnormal output impedance — Output impedance abnormal.
Cause: Abnormal impedance detected on output (possible bad connection, contactor or wiring issue).
Source: felicitysolar FLA48500 LiFePO4 Battery System for Households User Guide.pdf · HE-GF-FLA-48500 Manual_20250327_EN.pdf
Anomale Ausgangsimpedanz — Abnormal output impedance. The output-side impedance measurement is outside the normal range, suggesting a wiring, contact, or load anomaly.
Cause: Output impedance abnormal. Possible loose connection, oxidised terminal, or unusual load.
Source: Benutzerhandbuch - Felicity FLS48100SG2.pdf
Abnormal output impedance — Output-impedance diagnostic failure displayed on the LCD BMS fault code / flag screen (section 4.4); BMS detected an out-of-spec impedance on the output path.
Cause: Loose or corroded output terminal connections, undersized cabling, or internal MOSFET / fuse degradation. Per section 1.3 only qualified service persons may service the device.
Restart the unit, if the error persists, contact the repair center.
Source: 358-010291-07.pdf, p.9
Also applies to:LPBF48100-H
Abnormal output impedance — Output impedance is outside expected range.
Cause: Loose terminal connection, internal MOS/wiring fault, or external short/open condition affecting impedance.
Restart the unit; if the error persists, contact the repair center.
Source: Manual-LPBF48200-H.pdf, p.10
C12
Cause: Abnormal output impedance — the output impedance is outside the normal range, possibly a loose connection, oxidised terminal, or unusual load.
Restart the unit, if the error persists, contact the repair center.
Source: Felicitysolar LPBF48350 17.5kWh 48V Solar Battery Pack with BMS User Guide.pdf
Also applies to:LUX-Y-48280LG01LUX-Y-48300LG01
Abnormal output impedance
Cause: BMS detected abnormal output impedance (e.g. loose/poor connection at output terminals).
Source: LUX-E-48100LG03-Lithium-Battery-User-Guide.pdf, p.13 · LUX-Y-4828048300LG01-Lithium-Battery-User-Guide.pdf, p.8
Also applies to:LUX-E-48230LG03LUX-E-48250LG03
C12
Cause: Abnormal output impedance — the output impedance is outside the normal range, possibly a loose connection, oxidised terminal, or unusual load.
Source: LUX-E-48200LG03-Lithium-Battery-User-Guide.pdf, p.13 · LUX-E-48230.250LG03-Lithium-Battery-User-Guide.pdf
Also applies to:LUX-X-48050LCG01LUX-X-48050LMG01LUX-X-48050LG01M2LUX-X-48050LG01M3LUX-X-48050LG01M4
C12 — Abnormal output impedance.
Cause: Output impedance is outside the normal range — possibly a loose connection, oxidised terminal, or unusual load.
Restart the unit, if the error persists, contact the repair center.
Source: LUX-X-48050LG01-low-voltage-battery-user-guide.pdf, p.17
Also applies to:LUX-X-48100LCG01LUX-X-48100LMG01
Abnormal output impedance — Detected abnormal output-side impedance (e.g. faulty contactor, bad connection or load anomaly).
Cause: Output impedance is outside the normal range — possibly a loose connection, oxidised terminal, or unusual load.
Restart the unit; if the error persists, contact the repair center.
Source: LUX-X-48100LG01-Litium-Battery-User-Guide.pdf, p.17
Also applies to:LUX-X-48100LCG01-USLUX-X-48100LMG01-USLUX-X-48100LG01-USM2LUX-X-48100LG01-USM3LUX-X-48100LG01-USM4LUX-X-48100LG01-USM5LUX-X-48100LG01-USM6LUX-X-48100LG01-USM7+1
Abnormal output impedance — Detected abnormal output-side impedance (e.g. faulty contactor, bad connection or load anomaly).
Cause: Output impedance is outside the normal range — possibly a loose connection, oxidised terminal, or unusual load.
Restart the unit, if the error persists, contact the repair center.
Source: 358-S010024-03LUX-X-48100LG01-User-manual_compressed.pdf, p.23
Prefer the full written guide? Read the complete Felicity inverter error-code guide
Compiled from official Felicity user manuals. Always consult your device manual and a qualified technician before performing repairs.