This is the complete fault table for the Felicity LUX-Y-48100HG01 Battery family — 34 codes shared by 5 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.
Last checked against the official manuals on July 10, 2026.
Main relay contacts have welded/stuck (relay adhesion).
CauseA safety relay inside the inverter has failed self-test or is stuck. The inverter is designed to refuse grid connection in this state, so this is not an issue you can clear with restart cycles.
Recommended fixRestart, if the fault still exists, contact our engineer.
Source:LUX-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 20
Battery protection: Internal short circuit detected.
CauseThe BMS detected a short circuit inside the battery pack and disconnected the output.
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-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 7
Inverter interface protection: External short circuit detected.
CauseA short circuit was detected on the external, inverter-side wiring or connection.
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-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 7
Inverter interface protection: Reverse polarity ground fault detected.
CauseReverse polarity or a ground fault was detected on the inverter-side wiring.
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-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 7
Battery system cannot work; when DC switch on and POWER on, the LCD doesn't light up or flash.
CauseBattery system failure preventing power-up.
Recommended fixPlease consider contact the local distributor.
Source:LUX-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 21
Analog Front End (AFE) measurement fault detected by the BMS.
CauseInternal BMS measurement IC (AFE) malfunction.
Recommended fixRestart, if the fault still exists, contact our engineer.
Source:LUX-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 20
Pre-charge / soft-start sequence failed during power-up.
CausePre-charge circuit failure, excessive inverter capacitance, or an external short on the output.
Recommended fixRestart, if the fault still exists, contact our engineer.
Source:LUX-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 20
Master-to-slave communication failure between BMS units.
CauseCommunication has been lost between the inverter and a peripheral device — typically a battery BMS, smart meter, or external monitoring dongle.
Recommended fixCheck for poor contact of the communication line.
Source:LUX-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 20
Output impedance below the expected threshold.
CauseSuspected short circuit on the output bus or a pre-charge fault.
Recommended fixRestart, if the fault still exists, contact our engineer.
Source:LUX-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 20
Slave BMS firmware version mismatch.
CauseSlave module firmware incompatible with the master controller.
Recommended fixContact our engineer to upgrade the program.
Source:LUX-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 20
Slave device version fault.
CauseA slave device's firmware or protocol version does not match the master controller — the program must be upgraded before the system can run.
Recommended fixContact our engineer to upgrade the program.
Source:LUX-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 20
Fault in parallel battery configuration.
CauseA single unit is installed to a parallel system, the number of parallel battery slave controls does not match, or the wiring between paralleled units is incorrect.
Recommended fix1. Please check if the number of parallel battery slave controls is the same. 2. Please check if a single unit is installed in a parallel system. 3. if this error occurs during parallel installation, please check the wiring. if they are connected correctly, please install them in parallel first and then restart the device. 4. if the problem persists, please contact the installation personnel.
Source:LUX-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 20
Alarm LED indicates the fault status of the battery, which lights up when the fault occurs.
CauseA fault condition has been detected by the BMS (refer to Fault Code Table for specific code).
Recommended fixCheck LCD touch screen for the specific fault code and follow the corresponding treatment measure.
Source:LUX-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 18
After the battery system is powered on, alarm information is displayed on the LCD and inverter display screen at the same time.
CauseAn active fault in the battery system that requires service intervention.
Recommended fixPlease contact the local distributor.
Source:LUX-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 21
The LCD display of LUX-Y-48100HG01 is normal, but it cannot charge and discharge. Inverter display screen shows no SOC.
CauseCAN communication between LUX-Y-48100HG01 and inverter is not connected or cable is faulty.
Recommended fixCheck whether the CAN communication between LUX-Y-48100HG01 to inverter is well connected. if the connection is good, please replace a CAN communication cable. if the SOC is still not visible on the inverter display screen, please contact the local distributor.
Source:LUX-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 21
Battery pack voltage exceeded the upper threshold.
CauseBattery pack overall voltage too high — an 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-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 20
Battery pack voltage fell below the lower threshold.
CauseBattery pack overall voltage too low — an 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-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 20
Individual cell voltage exceeded the upper threshold.
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-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 20
Individual cell voltage fell below the lower threshold.
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-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 20
Charging current exceeded the upper threshold.
CauseExcessive charging current from the inverter or charger.
Recommended fixReduce charging current.
Source:LUX-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 20
Discharging current exceeded the upper threshold.
CauseExcessive load current draw from the battery.
Recommended fixReduce discharging current.
Source:LUX-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 20
BMS temperature is too high.
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-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 20
BMS temperature is too low.
CauseBMS too cold — ambient temperature below the operating range.
Recommended fixWait for temperature rise.
Source:LUX-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 20
Cell temperature is too high.
CauseCell overheating due to high ambient temperature or high-current operation.
Recommended fixStop charging and discharging, wait for the temperature to drop.
Source:LUX-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 20
Cell temperature is too low.
CauseCell too cold — ambient temperature below the charge/discharge range.
Recommended fixWait for temperature rise.
Source:LUX-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 20
Battery protection: Over current condition detected.
CauseCharge or discharge current exceeded the battery's protection limit, tripping the BMS over-current protection.
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-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 7
Battery protection: Over temperature condition detected.
CauseInverter internal temperature has exceeded the safe operating threshold. Causes include high ambient temperature, blocked cooling vents, failed cooling fan, or installation in direct sunlight.
Recommended fixPower down the inverter and let it cool. Inspect cooling vents and fan inlets for dust, leaves, or insect nests — clean with compressed air. Confirm the inverter is installed in a shaded, ventilated location with the manufacturer's required clearances on all sides. If the fan does not spin on restart, fan replacement is required.
Source:LUX-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 7
Battery protection: Over voltage condition detected.
CauseThe BMS detected battery voltage above its protection limit (overcharge) and disconnected to protect the cells.
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-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 7
Battery protection: Under voltage condition detected.
CauseThe BMS detected battery voltage below its protection limit (over-discharge) and disconnected to protect the cells.
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-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 7
Inverter interface protection: In rush current condition detected.
CauseA large inrush current was detected at the inverter interface — typically the surge when a connected inverter's input capacitors charge at connection.
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-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 7
Inverter interface protection: Over current condition detected at inverter interface.
CauseCurrent at the inverter interface exceeded the protection limit — the inverter is drawing or feeding more current than the battery allows.
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-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 7
Inverter interface protection: Over temperature detected.
CauseInverter internal temperature has exceeded the safe operating threshold. Causes include high ambient temperature, blocked cooling vents, failed cooling fan, or installation in direct sunlight.
Recommended fixPower down the inverter and let it cool. Inspect cooling vents and fan inlets for dust, leaves, or insect nests — clean with compressed air. Confirm the inverter is installed in a shaded, ventilated location with the manufacturer's required clearances on all sides. If the fan does not spin on restart, fan replacement is required.
Source:LUX-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 7
Inverter interface protection: Over voltage condition detected at inverter interface.
CauseVoltage at the inverter interface exceeded the protection limit — usually a connected inverter or charger applying a voltage above the battery's allowed range.
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-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 7
Status LED indicates the operating status of the battery, which is always on when running normally. if not on, battery is not running normally.
CauseBattery system is not in normal running state.
Recommended fixCheck power switch, breaker, and review LCD for fault information.
Source:LUX-Y-48100HG01-Lithium-Battery-User-Guide.pdf· page 18
Send us the code on your screen and a Felicity technician will reply with the exact steps for your unit. Support is free for life — a first diagnosis never needs a callout.
Compiled from official Felicity user manuals. Always consult your device manual and a qualified technician before performing repairs.