This is the complete fault table for the Felicity LUX-X-48100LG01 Battery family — 25 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.
Last checked against the official manuals on July 10, 2026.
Total battery pack voltage has exceeded the upper protection threshold.
CauseTotal battery pack voltage exceeded the upper protection threshold — charging continued past the over-voltage protection point.
Recommended fixRestart the unit; if the error persists, contact the repair center.
Source:LUX-X-48100LG01-Litium-Battery-User-Guide.pdf· page 17
Total battery pack voltage has dropped below the lower protection threshold.
CauseTotal battery pack voltage fell below the lower protection threshold — an over-discharge condition.
Recommended fixRestart the unit; if the error persists, contact the repair center.
Source:LUX-X-48100LG01-Litium-Battery-User-Guide.pdf· page 17
An individual cell voltage has exceeded its upper protection threshold.
CauseA single cell voltage reached the protection value during charging — typically cell imbalance letting one cell drift above its safe ceiling.
Recommended fixRestart the unit; if the error persists, contact the repair center.
Source:LUX-X-48100LG01-Litium-Battery-User-Guide.pdf· page 17
An individual cell voltage has dropped below its lower protection threshold.
CauseA single cell voltage fell below the protection value during discharge — deep discharge or a weak, aged cell pulling below the limit.
Recommended fixRestart the unit; if the error persists, contact the repair center.
Source:LUX-X-48100LG01-Litium-Battery-User-Guide.pdf· page 17
Charging current has exceeded the protection limit.
CauseCharging current exceeded the protection trigger value — the inverter or charger charge-current setting is too high for this pack.
Recommended fixRestart the unit; if the error persists, contact the repair center.
Source:LUX-X-48100LG01-Litium-Battery-User-Guide.pdf· page 17
Discharging current has exceeded the protection limit.
CauseDischarging current exceeded the protection trigger value — the connected load or inverter discharge current is too high.
Recommended fixRestart the unit; if the error persists, contact the repair center.
Source:LUX-X-48100LG01-Litium-Battery-User-Guide.pdf· page 17
MOSFET (power switch) temperature has exceeded the upper protection limit.
Cause1. The inner temperature is over the limitation. 2. Check whether the ambient temperature is too high.
Recommended fixReduce ambient temperature and improve ventilation; if the error persists, return to repair center.
Source:LUX-X-48100LG01-Litium-Battery-User-Guide.pdf· page 17
MOSFET (power switch) temperature is below the lower protection limit.
Cause1. The internal temperature is lower than the limit range. 2. Check whether the ambient temperature is too low.
Recommended fixRaise ambient temperature above the operating minimum; if the error persists, return to repair center.
Source:LUX-X-48100LG01-Litium-Battery-User-Guide.pdf· page 17
A battery cell temperature has exceeded the upper protection limit.
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 fixRestart the unit; if the error persists, contact the repair center.
Source:LUX-X-48100LG01-Litium-Battery-User-Guide.pdf· page 17
A battery cell temperature has dropped below the lower protection limit.
CauseInverter ambient temperature is below the minimum operating range. Most common in unheated outdoor installs in winter.
Recommended fixRestart the unit; if the error persists, contact the repair center.
Source:LUX-X-48100LG01-Litium-Battery-User-Guide.pdf· page 17
Battery pack has lost its output (no DC output detected at the terminals).
CauseOpen circuit breaker, blown fuse or other output-path interruption.
Recommended fix1. 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.
Source:LUX-X-48100LG01-Litium-Battery-User-Guide.pdf· page 17
FAULT mode indicated by RED LED ON with LED1 ON, LED2 ON, LED3 ON, LED4 OFF: BMS PCB / MOSFET temperature above safe limit.
CauseInner BMS temperature exceeds limitation; ambient too hot or excessive current.
Recommended fixReduce ambient temperature, ensure clearance for heat dissipation, reduce current; allow to cool.
Source:LUX-X-48100LG01-Litium-Battery-User-Guide.pdf· page 15
FAULT mode indicated by RED LED ON with LED1 OFF, LED2 OFF, LED3 OFF, LED4 ON: BMS PCB temperature below safe limit.
CauseBMS internal temperature below operating range; ambient too cold.
Recommended fixMove battery to environment within operating temperature range (above 0 degC).
Source:LUX-X-48100LG01-Litium-Battery-User-Guide.pdf· page 15
FAULT mode indicated by RED LED ON, GREEN LED OFF, with LED1 ON, LED2 OFF, LED3 OFF, LED4 OFF: total battery voltage above safe threshold.
CauseBattery pack voltage above safe threshold.
Recommended fixStop charging and check charger/inverter charge-voltage settings; allow voltage to recover.
Source:LUX-X-48100LG01-Litium-Battery-User-Guide.pdf· page 15
FAULT mode indicated by RED LED ON with LED1 OFF, LED2 ON, LED3 OFF, LED4 OFF: total battery voltage below safe threshold.
CauseBattery pack voltage below safe threshold (deeply discharged).
Recommended fixRecharge the battery promptly using AC or PV; do not leave the pack idle in low-power state.
Source:LUX-X-48100LG01-Litium-Battery-User-Guide.pdf· page 15
FAULT mode indicated by RED LED ON with LED1 ON, LED2 OFF, LED3 ON, LED4 OFF: charging current above protection limit.
CauseCharger / inverter requesting current above pack limit.
Recommended fixReduce charge current setting on the inverter/charger to within the pack rating.
Source:LUX-X-48100LG01-Litium-Battery-User-Guide.pdf· page 15
FAULT mode indicated by RED LED ON with LED1 ON, LED2 OFF, LED3 OFF, LED4 ON: a cell temperature is above safe limit.
CauseCell temperature exceeds protection threshold.
Recommended fixStop charging/discharging, allow battery to cool; check ambient temperature and ventilation.
Source:LUX-X-48100LG01-Litium-Battery-User-Guide.pdf· page 15
FAULT mode indicated by RED LED ON with LED1 OFF, LED2 ON, LED3 OFF, LED4 ON: a cell temperature is below safe limit.
CauseCell temperature below operating range.
Recommended fixWarm the battery to above 0 degC before charging/discharging.
Source:LUX-X-48100LG01-Litium-Battery-User-Guide.pdf· page 15
FAULT mode indicated by RED LED ON with LED1 ON, LED2 ON, LED3 OFF, LED4 OFF: an individual cell voltage exceeds the safe upper limit.
CauseOne or more cells over-voltage; possible cell imbalance or charger overvoltage.
Recommended fixStop charging; verify charger/inverter max charge voltage; allow BMS to balance and recover.
Source:LUX-X-48100LG01-Litium-Battery-User-Guide.pdf· page 15
FAULT mode indicated by RED LED ON with LED1 OFF, LED2 OFF, LED3 ON, LED4 OFF: an individual cell voltage is below the safe lower limit.
CauseCell undervoltage / over-discharge.
Recommended fixRecharge promptly; if cells fail to recover, return battery to repair center.
Source:LUX-X-48100LG01-Litium-Battery-User-Guide.pdf· page 15
FAULT mode indicated by RED LED ON with LED1 OFF, LED2 ON, LED3 ON, LED4 OFF: discharge current above protection limit.
CauseLoad / inverter draws current above pack limit; possible short circuit.
Recommended fixReduce load; check for short-circuit on output; verify inverter sizing matches battery count.
Source:LUX-X-48100LG01-Litium-Battery-User-Guide.pdf· page 15
Internal current sensor / sampling circuit returned an abnormal reading.
CauseThe internal current sensor or sampling circuit reported abnormal values — an internal BMS hardware fault.
Recommended fixRestart the unit; if the error persists, contact the repair center.
Source:LUX-X-48100LG01-Litium-Battery-User-Guide.pdf· page 17
Detected abnormal output-side impedance (e.g. faulty contactor, bad connection or load anomaly).
CauseOutput impedance is outside the normal range — possibly a loose connection, oxidised terminal, or unusual load.
Recommended fixRestart the unit; if the error persists, contact the repair center.
Source:LUX-X-48100LG01-Litium-Battery-User-Guide.pdf· page 17
Parallel-mode handshake/operation between battery packs failed.
Cause1. Check whether a single unit is wrongly installed into a parallel system. 2. if error happens during parallel installation, wires may be misconnected.
Recommended fix1. 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.
Source:LUX-X-48100LG01-Litium-Battery-User-Guide.pdf· page 17
FAULT mode indicated by RED LED ON with LED1 ON, LED2 ON, LED3 OFF, LED4 ON: internal current sensor reports abnormal reading.
CauseFaulty current sampling circuit / sensor inside BMS.
Recommended fixRestart the unit; if the error persists, return to repair center.
Source:LUX-X-48100LG01-Litium-Battery-User-Guide.pdf· page 15
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.