Analog Front End (AFE) fault detected by the BMS.
CauseInternal BMS measurement IC (AFE) malfunction.
Recommended fixRestart, if the fault still exists, contact our engineer.
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 21
Felicity LUX-X-96050HG01 Error Codes: Causes & Fixes (33 codes)
This is the complete fault table for the Felicity LUX-X-96050HG01 Battery family — 33 codes shared by 3 model numbers, transcribed from the official manual. On this Felicity device, a fault code means the unit has entered protection and stopped normal operation; a warning leaves it running. The exact indication (LED pattern or display code) is listed per code below.
Also coversLUX-X-96050HMG01LUX-X-96050HCG01
Last checked against the official manuals on July 10, 2026.
How to read the severity labels
- Critical(19)— unit trips offline — do not restart before checking
- Warning(11)— unit keeps running · needs attention
- Info(3)— status message · no action forced
Critical codes (19)unit trips offline — do not restart before checking
Pre-charge / soft-start sequence failed during system power-up.
CausePre-charge circuit failure, excessive inverter capacitance, or external short on output.
Recommended fixRestart, if the fault still exists, contact our engineer.
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 21
Communication failure between the master controller and one or more slave battery modules.
CausePoor contact / loose or damaged inter-module communication cable.
Recommended fixCheck for poor contact of the communication line.
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 21
Output impedance is too low (possible short-circuit or bus fault detected).
CauseSuspected short-circuit on output bus or precharge fault.
Recommended fixRestart, if the fault still exists, contact our engineer.
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 21
Firmware version mismatch on one or more slave battery modules.
CauseSlave module firmware incompatible with the master controller.
Recommended fixContact our engineer to upgrade the program.
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 21
PROT_BAT_INTERNAL_SHORTCritical
Battery Internal Short Circuit Protection.
CriticalInternal short circuit detected within the battery pack.
CauseInternal cell or busbar short within the battery module.
Recommended fixStop using the battery immediately and contact FelicityESS service; do not charge or discharge a damaged battery.
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 7
PROT_BAT_OVERCURRENTCritical
Battery Over Current Protection.
CriticalBattery over-current protection trip.
CauseCharge or discharge current exceeded battery limit (max continuous 50A, peak 60A/15s).
Recommended fixReduce current; verify inverter is configured within recommended 25A continuous (max 50A) range.
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 7
PROT_BAT_OVERTEMPCritical
Battery Over Temperature Protection.
CriticalBattery over-temperature protection trip.
CauseCell or pack temperature exceeded safe operating limit.
Recommended fixStop charging/discharging, allow battery to cool, ensure ambient is within Charge 0~+55C / Discharge -20C~+55C.
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 7
PROT_BAT_OVERVOLTAGECritical
Battery Over Voltage Protection.
CriticalBattery overall over-voltage protection trip.
CauseBattery pack voltage exceeded safe maximum (overcharge).
Recommended fixStop charging; check inverter charge voltage settings (target 113.6V x N).
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 7
PROT_BAT_UNDERVOLTAGECritical
Battery Under Voltage Protection.
CriticalBattery overall under-voltage protection trip.
CauseBattery pack voltage dropped below safe minimum (over-discharge).
Recommended fixStop discharging; recharge battery promptly. Battery should be charged within 3 months of storage to avoid deep discharge.
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 7
PROT_INV_EXT_SHORT_CIRCUITCritical
External Short Circuit Protection.
CriticalExternal short-circuit detected at the inverter interface.
CauseShort circuit on the DC power cabling between battery and inverter.
Recommended fixPower off system and inspect DC wiring and inverter for short circuit before re-energising.
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 7
PROT_INV_INRUSH_CURRENTCritical
Inrush Current Protection.
CriticalInrush current protection trip when battery output is connected to inverter.
CauseExcessive inrush current to inverter capacitors at startup (precharge issue).
Recommended fixRestart the battery and inverter following correct power-on sequence; if persistent, contact service engineer.
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 7
PROT_INV_OVERCURRENTCritical
Inverter Interface Over Current Protection.
CriticalInverter-side over-current protection trip on the battery interface.
CauseCharge or discharge current at inverter interface exceeds limit.
Recommended fixReduce inverter charge/discharge current setpoint; verify cabling and load conditions.
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 7
PROT_INV_OVERTEMPCritical
Inverter Interface Over Temperature Protection.
CriticalOver-temperature protection at the inverter interface.
CauseBattery interface / contactor temperature exceeded safe limit.
Recommended fixAllow system to cool; verify ventilation and ambient temperature within specification (Charge 0~+55C / Discharge -20C~+55C).
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 7
PROT_INV_OVERVOLTAGECritical
Inverter Interface Over Voltage Protection.
CriticalInverter-side over-voltage protection trip on the battery inverter interface.
CauseInverter or DC bus voltage exceeds safe value at the battery interface.
Recommended fixCheck inverter charge voltage settings and DC bus; ensure inverter compatibility and correct configuration.
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 7
PROT_INV_REVERSE_POLARITY_GNDCritical
Reverse Polarity Ground Fault.
CriticalReverse polarity / ground fault detected on the inverter interface.
CauseBattery (+) and (-) cables connected with reversed polarity to the inverter, or ground fault.
Recommended fixPower off and verify polarity of DC cabling between battery and inverter; correct wiring before re-energising.
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 7
TS_ALARM_ON_LCD_AND_INVERTERCritical
Alarm information shown on both LCD and inverter screen after power-on.
CriticalAfter the battery system is powered on, alarm information appears simultaneously on the LCD and inverter display screen.
CauseActive fault in the battery system requiring service intervention.
Recommended fixContact the local distributor.
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 22
TS_LCD_NO_LIGHTCritical
LCD does not light up or flash on power-on.
CriticalAfter DC switch on and POWER on, the LCD does not light up or flash; battery system cannot work.
CauseBattery system internal fault preventing power-up.
Recommended fixContact the local distributor.
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 22
TS_NO_SOC_AT_INVERTERCritical
LCD normal but cannot charge/discharge (no SOC at inverter).
CriticalLCD display of LUX-X-96050HCG01 is normal but battery cannot charge or discharge; inverter screen shows no SOC.
CauseCAN communication failure between LUX-X-96050HCG01 and inverter.
Recommended fixCheck CAN communication between LUX-X-96050HCG01 and inverter; if connection is good, replace the CAN communication cable. if SOC is still not visible, contact the local distributor.
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 22
Warning codes (11)unit keeps running · needs attention
Battery pack voltage exceeds the upper threshold.
CauseBattery pack overall voltage too high (overcharge condition).
Recommended fixPower down the inverter, wait 5 minutes for capacitors to discharge, then restart. If the fault recurs immediately or repeatedly, record the exact code and contact your installer or the manufacturer's service line.
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 21
Battery pack voltage below the lower threshold.
CauseBattery pack overall voltage too low (over-discharge condition).
Recommended fixPower down the inverter, wait 5 minutes for capacitors to discharge, then restart. If the fault recurs immediately or repeatedly, record the exact code and contact your installer or the manufacturer's service line.
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 21
Individual cell voltage exceeds maximum allowed value.
CauseCell-level overvoltage (imbalance or overcharge of a single cell).
Recommended fixPower down the inverter, wait 5 minutes for capacitors to discharge, then restart. If the fault recurs immediately or repeatedly, record the exact code and contact your installer or the manufacturer's service line.
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 21
Individual cell voltage below minimum allowed value.
CauseCell-level undervoltage (imbalance or deep discharge of a single cell).
Recommended fixPower down the inverter, wait 5 minutes for capacitors to discharge, then restart. If the fault recurs immediately or repeatedly, record the exact code and contact your installer or the manufacturer's service line.
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 21
Charging current above safe limit.
CauseExcessive charging current from inverter/charger.
Recommended fixReduce charging current.
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 21
Discharging current above safe limit.
CauseExcessive load current draw from the battery.
Recommended fixReduce discharging current.
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 21
BMS internal temperature has exceeded safe operating limit.
CauseBMS overheating due to high ambient temperature, poor ventilation, or high current operation.
Recommended fixStop charging and discharging, wait for the temperature to drop.
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 21
BMS internal temperature is below safe operating limit.
CauseBMS too cold (ambient temperature below operating range).
Recommended fixWait for temperature rise.
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 21
Battery cell temperature has exceeded safe operating limit.
CauseCell overheating due to high ambient temperature or high current operation.
Recommended fixStop charging and discharging, wait for the temperature to drop.
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 21
Battery cell temperature is below safe operating limit.
CauseCell too cold (ambient temperature below charge/discharge range).
Recommended fixWait for temperature rise.
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 21
ALARM_LEDWarning
Alarm LED.
WarningIndicates the fault status of the battery; lights up when a fault occurs.
CauseAny active BMS fault condition (see fault codes 01-15).
Recommended fixCheck LCD fault message for detailed fault definition before troubleshooting; the alarm clears automatically once the triggering condition is removed.
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 19
Info codes (3)status message · no action forced
CHARGING_LEDInfo
Charging LED.
InfoIndicates the charging status of the battery; flashing indicates charging.
CauseThe battery is charging — a flashing charging LED is the normal charge-status indication, not a fault.
Recommended fixPower down the inverter, wait 5 minutes for capacitors to discharge, then restart. If the fault recurs immediately or repeatedly, record the exact code and contact your installer or the manufacturer's service line.
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 19
STATUS_LEDInfo
Status LED.
InfoIndicates the operating status of the battery; always on when running normally.
CauseNormal operation — the status LED stays on while the battery is running normally; it does not signal a fault.
Recommended fixPower down the inverter, wait 5 minutes for capacitors to discharge, then restart. If the fault recurs immediately or repeatedly, record the exact code and contact your installer or the manufacturer's service line.
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 19
WAITING_TO_CONNECTInfo
Waiting to Connect (LCD icon).
InfoLCD icon lights up to indicate that the battery is waiting to be connected and there is no output at this time. After entering normal working mode, this icon disappears.
CauseBattery has not yet established connection / handshake with the inverter.
Recommended fixWait for the battery to enter normal working mode; if it persists, check CAN/RS485 communication wiring to the inverter.
Source:LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf· page 20
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Common questions about LUX-X-96050HG01 error codes
- What is the difference between a fault and a warning on the LUX-X-96050HG01?
- A fault puts the unit into protection and stops normal operation — this page lists 19 of them for the LUX-X-96050HG01. A warning leaves the unit running; there are 11 warning codes here. Resolve the cause of a fault before restarting; warnings can usually be cleared while the unit runs.
- Which model numbers does this page cover?
- The LUX-X-96050HG01 shares its firmware and fault table with 2 other model numbers: LUX-X-96050HMG01, LUX-X-96050HCG01. If your unit is any of these, every code on this page applies to it.
- Where do these codes come from?
- Every entry was transcribed from LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf — Felicity's official documentation. Each row cites its source manual (and page where printed), so you can verify the wording before acting on it.
Compiled from official Felicity user manuals. Always consult your device manual and a qualified technician before performing repairs.