Abnormal output impedance.
C12 on a Felicity unit indicates: Abnormal output impedance.. It is a fault-severity event that can appear on 17 different devices in the Felicity catalog. The same code may have slightly different recommended fixes depending on the device — the per-device sections below show the exact wording from each device's official manual.
Fault codes stop normal operation but the unit may attempt to recover. Common causes are out-of-range conditions (voltage, current, temperature) that require checking inputs and outputs before restart.
C12 is triggered when the unit's protection or monitoring logic detects the specific condition described above. The exact trigger depends on the device — see the per-device sections for the official manual entry for each.
Abnormal output impedance fault. LED pattern: LED1 OFF, LED2 OFF, LED3 ON, LED4 ON.
Restart the unit. if the error persists, contact the repair center.
Felicitysolar FLA12100 12.5Kwh Battery Energy Storage System User Manual.pdf · page 1Battery output impedance is abnormal.
Restart the unit. if the error persists, contact the repair center.
Felicitysolar FLA48200 48V 200Ah 10kWh Lithium Phosphate Battery User Manual.pdf · page 13BMS detected abnormal output impedance on the DC output path.
Restart the unit. if the error persists, contact the repair center.
6peluqppy_66a93554057c8.pdf · page 13Abnormal output impedance.
Restart the unit. if the error persists, contact the repair center.
FLA48250-EU_Manual.pdf · page 8Output impedance abnormal.
Abnormal impedance detected on output (possible bad connection, contactor or wiring issue).
Restart the unit. if the error persists, contact the repair center.
felicitysolar FLA48500 LiFePO4 Battery System for Households User Guide.pdfAbnormal output impedance. The output-side impedance measurement is outside the normal range, suggesting a wiring, contact, or load anomaly.
Output impedance abnormal (Ausgangsimpedanz anormal). Possible loose connection, oxidised terminal, or unusual load.
Restart the unit. if the error persists, return to repair centre. Inspect output cabling and terminations.
Benutzerhandbuch - Felicity FLS48100SG2.pdfOutput impedance abnormal.
Abnormal impedance detected on output (possible bad connection, contactor or wiring issue).
Restart the unit. if the error persists, contact the repair center.
HE-GF-FLA-48500 Manual_20250327_EN.pdfOutput-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.
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.
358-010291-07.pdf · page 9Output impedance is outside expected range.
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.
Manual-LPBF48200-H.pdf · page 10Restart the unit, if the error persists, contact the repair center.
Felicitysolar LPBF48350 17.5kWh 48V Solar Battery Pack with BMS User Guide.pdfBMS detected abnormal output impedance (e.g. loose/poor connection at output terminals).
Restart the unit. if the error persists, contact the repair center.
LUX-E-48100LG03-Lithium-Battery-User-Guide.pdf · page 13Restart the unit. if the error persists, contact the repair center.
LUX-E-48200LG03-Lithium-Battery-User-Guide.pdf · page 13Restart the unit. if the error persists, contact the repair center.
LUX-E-48230.250LG03-Lithium-Battery-User-Guide.pdfAbnormal output impedance.
Restart the unit, if the error persists, contact the repair center.
LUX-X-48050LG01-low-voltage-battery-user-guide.pdf · page 17Detected abnormal output-side impedance (e.g. faulty contactor, bad connection or load anomaly).
Restart the unit; if the error persists, contact the repair center.
LUX-X-48100LG01-Litium-Battery-User-Guide.pdf · page 17Detected abnormal output-side impedance (e.g. faulty contactor, bad connection or load anomaly).
Restart the unit, if the error persists, contact the repair center.
358-S010024-03LUX-X-48100LG01-User-manual_compressed.pdf · page 23BMS detected abnormal output impedance (e.g. loose/poor connection at output terminals).
Restart the unit. if the error persists, contact the repair center.
LUX-Y-4828048300LG01-Lithium-Battery-User-Guide.pdf · page 8Compiled from official Felicity user manuals. Always consult your device manual and a qualified technician before performing repairs.