The Felicity LUX-X-48100LG01-US is a Battery unit covered by a shared firmware family that includes 10 variants. The error codes listed below apply to every variant in this family — LUX-X-48100LG01-US, LUX-X-48100LCG01-US, LUX-X-48100LMG01-US, LUX-X-48100LG01-USM2 and 6 others. If your unit's exact model number isn't shown in the title but is listed in the "also covers" tags, this is the correct reference page.
Each row below shows an error code, its severity, and a brief description. Click any row to expand the full cause and the recommended fix. The severity dot tells you whether the unit will keep operating (warning), derate (fault), or trip offline (critical). For codes that require an authorized service partner, the recommended-fix block says so explicitly.
Total battery pack voltage has exceeded the upper protection threshold.
Restart the unit, if the error persists, contact the repair center.
358-S010024-03LUX-X-48100LG01-User-manual_compressed.pdf · page 23Total battery pack voltage has dropped below the lower protection threshold.
Restart the unit, if the error persists, contact the repair center.
358-S010024-03LUX-X-48100LG01-User-manual_compressed.pdf · page 23An individual cell voltage has exceeded its upper protection threshold.
Restart the unit, if the error persists, contact the repair center.
358-S010024-03LUX-X-48100LG01-User-manual_compressed.pdf · page 23An individual cell voltage has dropped below its lower protection threshold.
Restart the unit, if the error persists, contact the repair center.
358-S010024-03LUX-X-48100LG01-User-manual_compressed.pdf · page 23Charging current has exceeded the protection limit.
Restart the unit, if the error persists, contact the repair center.
358-S010024-03LUX-X-48100LG01-User-manual_compressed.pdf · page 23Discharging current has exceeded the protection limit.
Restart the unit, if the error persists, contact the repair center.
358-S010024-03LUX-X-48100LG01-User-manual_compressed.pdf · page 23MOSFET (power switch) temperature has exceeded the upper protection limit. Note: this code is listed twice in the manual's fault table.
1. The inner temperature is over the limitation. 2. Check whether the ambient temperature is too high.
Reduce ambient temperature and improve ventilation; if the error persists, return to repair center.
358-S010024-03LUX-X-48100LG01-User-manual_compressed.pdf · page 23MOSFET (power switch) temperature is below the lower protection limit.
1. The internal temperature is lower than the limit range. 2. Check whether the ambient temperature is too low.
Raise ambient temperature above the operating minimum; if the error persists, return to repair center.
358-S010024-03LUX-X-48100LG01-User-manual_compressed.pdf · page 23A battery cell temperature has exceeded the upper protection limit.
Restart the unit, if the error persists, contact the repair center.
358-S010024-03LUX-X-48100LG01-User-manual_compressed.pdf · page 23A battery cell temperature has dropped below the lower protection limit.
Restart the unit, if the error persists, contact the repair center.
358-S010024-03LUX-X-48100LG01-User-manual_compressed.pdf · page 23Internal current sensor / sampling circuit returned an abnormal reading.
Restart the unit, if the error persists, contact the repair center.
358-S010024-03LUX-X-48100LG01-User-manual_compressed.pdf · page 23Detected 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 23Parallel-mode handshake/operation between battery packs failed.
Either a single unit is wrongly configured for parallel operation, or wires are misconnected during parallel installation.
1. Please check if single unit is installed to parallel system. 2. if this error happens during parallel installation, please check wires connection. if they are connected correctly, please finish parallel installation first, and then restart the unit. 3. if the problem remains, please contact your installer.
358-S010024-03LUX-X-48100LG01-User-manual_compressed.pdf · page 23Battery pack has lost its output (no DC output detected at the terminals).
Open circuit breaker, blown fuse or other output-path interruption.
1. Please check whether the circuit breaker is closed; 2. Please check whether the fuse is normal; 3. Restart the unit, if the error persists, contact the repair center.
358-S010024-03LUX-X-48100LG01-User-manual_compressed.pdf · page 23FAULT mode signalled by RED LED ON with LED1 ON, LED2 ON, LED3 ON, LED4 OFF: BMS PCB / MOSFET temperature above safe limit.
Inner BMS temperature exceeds limitation; ambient too hot or excessive current.
Reduce ambient temperature, ensure clearance for heat dissipation, reduce current; allow to cool.
358-S010024-03LUX-X-48100LG01-User-manual_compressed.pdf · page 21FAULT mode signalled by RED LED ON with LED1 OFF, LED2 OFF, LED3 OFF, LED4 ON: BMS PCB temperature below safe limit.
BMS internal temperature below operating range; ambient too cold.
Move battery to environment within operating temperature range (above 0 degC).
358-S010024-03LUX-X-48100LG01-User-manual_compressed.pdf · page 21FAULT mode signalled by RED LED ON, GREEN LED OFF, with LED1 ON, LED2 OFF, LED3 OFF, LED4 OFF: total battery voltage above safe threshold.
Battery pack voltage above safe threshold.
Stop charging and check charger/inverter charge-voltage settings; allow voltage to recover.
358-S010024-03LUX-X-48100LG01-User-manual_compressed.pdf · page 21FAULT mode signalled by RED LED ON with LED1 OFF, LED2 ON, LED3 OFF, LED4 OFF: total battery voltage below safe threshold.
Battery pack voltage below safe threshold (deeply discharged).
Recharge the battery promptly using AC or PV; do not leave the pack idle in low-power state.
358-S010024-03LUX-X-48100LG01-User-manual_compressed.pdf · page 21FAULT mode signalled by RED LED ON with LED1 ON, LED2 OFF, LED3 ON, LED4 OFF: charging current above protection limit.
Charger / inverter requesting current above pack limit.
Reduce charge current setting on the inverter/charger to within the pack rating.
358-S010024-03LUX-X-48100LG01-User-manual_compressed.pdf · page 21FAULT mode signalled by RED LED ON with LED1 ON, LED2 ON, LED3 OFF, LED4 ON: internal current sensor reports abnormal reading.
Faulty current sampling circuit / sensor inside BMS.
Restart the unit; if the error persists, return to repair center.
358-S010024-03LUX-X-48100LG01-User-manual_compressed.pdf · page 21FAULT mode signalled by RED LED ON with LED1 ON, LED2 OFF, LED3 OFF, LED4 ON: a cell temperature is above safe limit.
Cell temperature exceeds protection threshold.
Stop charging/discharging, allow battery to cool; check ambient temperature and ventilation.
358-S010024-03LUX-X-48100LG01-User-manual_compressed.pdf · page 21FAULT mode signalled by RED LED ON with LED1 OFF, LED2 ON, LED3 OFF, LED4 ON: a cell temperature is below safe limit.
Cell temperature below operating range.
Warm the battery to above 0 degC before charging/discharging.
358-S010024-03LUX-X-48100LG01-User-manual_compressed.pdf · page 21FAULT mode signalled by RED LED ON with LED1 ON, LED2 ON, LED3 OFF, LED4 OFF: an individual cell voltage exceeds the safe upper limit.
One or more cells over-voltage; possible cell imbalance or charger overvoltage.
Stop charging; verify charger/inverter max charge voltage; allow BMS to balance and recover.
358-S010024-03LUX-X-48100LG01-User-manual_compressed.pdf · page 21FAULT mode signalled by RED LED ON with LED1 OFF, LED2 OFF, LED3 ON, LED4 OFF: an individual cell voltage is below the safe lower limit.
Cell undervoltage / over-discharge.
Recharge promptly; if cells fail to recover, return battery to repair center.
358-S010024-03LUX-X-48100LG01-User-manual_compressed.pdf · page 21FAULT mode signalled by RED LED ON with LED1 OFF, LED2 ON, LED3 ON, LED4 OFF: discharge current above protection limit.
Load / inverter draws current above pack limit; possible short circuit.
Reduce load; check for short-circuit on output; verify inverter sizing matches battery count.
358-S010024-03LUX-X-48100LG01-User-manual_compressed.pdf · page 21Write down the exact code shown on the display, what the unit was doing when it appeared (charging, discharging, idle, grid-tied), and any LEDs or audible alarms. The same code can have different fixes depending on context.
Find the code in the list below and read the cause + recommended fix. Most warning-level codes can be cleared by following the listed action — usually reducing load, checking wiring, or restarting the unit.
Each code shows the source manual filename and page number. Open that exact page in the official manual to verify model-specific notes (firmware version, parallel-config notes, regional variants) before acting.
If a fix requires opening the enclosure or accessing terminals, disconnect AC input, DC PV, and battery in that order. Wait at least 60 seconds for capacitors to discharge before touching any conductors.
Critical codes (short-circuit, IGBT failure, BMS hardware error) should not be cleared by end users. Note the code, model number, and source manual page, then contact an authorized service partner.
Compiled from official Felicity user manuals. Always consult your device manual and a qualified technician before performing repairs.