Cell undervoltage
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.
The exact meaning depends on your model:
Also applies to:FLA48200
Cell undervoltage
Cause: An individual cell fell below its under-voltage protection value during discharging, usually deep discharge or a weak, imbalanced cell, so the BMS stopped supplying power.
Source: Felicitysolar FLA12100 12.5Kwh Battery Energy Storage System User Manual.pdf, p.1 · Felicitysolar FLA48200 48V 200Ah 10kWh Lithium Phosphate Battery User Manual.pdf, p.12
Cell undervoltage — Individual cell voltage has fallen below its lower protection threshold.
Cause: An individual cell fell below its under-voltage protection value during discharging, usually deep discharge or a weak, imbalanced cell, so the BMS stopped supplying power.
Source: 6peluqppy_66a93554057c8.pdf, p.12
C04 — Cell undervoltage.
Cause: An individual cell fell below its under-voltage protection value during discharging, usually deep discharge or a weak, imbalanced cell, so the BMS stopped supplying power.
Source: FLA48250-EU_Manual.pdf, p.8
Also applies to:HE-GF-FLA-48500
Cell undervoltage — Individual cell undervoltage protection triggered.
Cause: One or more cells dropped below the per-cell lower voltage limit.
Source: felicitysolar FLA48500 LiFePO4 Battery System for Households User Guide.pdf · HE-GF-FLA-48500 Manual_20250327_EN.pdf
Zell-Unterspannung — Cell undervoltage. Voltage of a single cell fell below the rated lower protection threshold.
Cause: Cell voltage below protection value during discharge.
Source: Benutzerhandbuch - Felicity FLS48100SG2.pdf
Single cell undervoltage — Individual-cell under-voltage fault displayed on the LCD BMS fault code / flag screen (section 4.4); one or more cells fell below the lower cell-voltage limit.
Cause: Deep discharge or a weak / aged cell pulling below the under-voltage threshold.
Restart the unit, if the error persists, contact the repair center.
Source: 358-010291-07.pdf, p.8
Also applies to:LPBF48100-H
Single cell undervoltage — An individual cell voltage has dropped below the protection limit.
Cause: One cell voltage below safe lower threshold (cell imbalance or over-discharge).
Restart the unit; if the error persists, contact the repair center.
Source: Manual-LPBF48200-H.pdf, p.10
C04
Cause: Cell undervoltage — a single cell fell below the protection value during discharge, from deep discharge or a weak, aged cell.
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
Cell undervoltage
Cause: An individual cell voltage fell below the lower protection threshold.
Source: LUX-E-48100LG03-Lithium-Battery-User-Guide.pdf, p.12 · LUX-Y-4828048300LG01-Lithium-Battery-User-Guide.pdf, p.8
Also applies to:LUX-E-48230LG03LUX-E-48250LG03
C04
Cause: Cell undervoltage — a single cell fell below the protection value during discharge, from deep discharge or a weak, aged cell.
Source: LUX-E-48200LG03-Lithium-Battery-User-Guide.pdf, p.12 · LUX-E-48230.250LG03-Lithium-Battery-User-Guide.pdf
Also applies to:LUX-X-48050LCG01LUX-X-48050LMG01LUX-X-48050LG01M2LUX-X-48050LG01M3LUX-X-48050LG01M4
C04 — Cell undervoltage.
Cause: A single cell voltage fell below the protection value during discharge — deep discharge or a weak, aged cell pulling below the limit.
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
Cell undervoltage — An individual cell voltage has dropped below its lower protection threshold.
Cause: A single cell voltage fell below the protection value during discharge — deep discharge or a weak, aged cell pulling below the limit.
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
Cell undervoltage — An individual cell voltage has dropped below its lower protection threshold.
Cause: A single cell voltage fell below the protection value during discharge — deep discharge or a weak, aged cell pulling below the limit.
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.