This is the complete fault table for the Felicity LUX-Y-48100HG01MN Battery — all 18 codes from the official manual on one page. 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.
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-48100HG01MN User manual 358-S010025-03 0325(V2.0).pdf· page 27
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-48100HG01MN User manual 358-S010025-03 0325(V2.0).pdf· page 27
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-48100HG01MN User manual 358-S010025-03 0325(V2.0).pdf· page 27
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-48100HG01MN User manual 358-S010025-03 0325(V2.0).pdf· page 27
CauseExcessive charging current from the inverter or charger.
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-48100HG01MN User manual 358-S010025-03 0325(V2.0).pdf· page 27
CauseExcessive load current draw from the battery.
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-48100HG01MN User manual 358-S010025-03 0325(V2.0).pdf· page 27
CauseBMS overheating due to high ambient temperature, poor ventilation, or high-current operation.
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-48100HG01MN User manual 358-S010025-03 0325(V2.0).pdf· page 27
CauseBMS too cold — ambient temperature below the operating 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-48100HG01MN User manual 358-S010025-03 0325(V2.0).pdf· page 27
CauseCell overheating due to high ambient temperature or high-current operation.
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-48100HG01MN User manual 358-S010025-03 0325(V2.0).pdf· page 27
CauseCell too cold — ambient temperature below the charge/discharge 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-48100HG01MN User manual 358-S010025-03 0325(V2.0).pdf· page 27
AFE (Analog Front End) fault.
CauseInternal BMS measurement IC (AFE) malfunction.
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-48100HG01MN User manual 358-S010025-03 0325(V2.0).pdf· page 27
CausePre-charge circuit failure, excessive inverter capacitance, or an external short on 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-48100HG01MN User manual 358-S010025-03 0325(V2.0).pdf· page 27
CauseCommunication has been lost between the inverter and a peripheral device — typically a battery BMS, smart meter, or external monitoring dongle.
Recommended fixVerify the communication cable (CAN/RS485/Modbus) is correctly seated and the right pinout is used. Check baud rate and protocol settings in both devices match. Reseat the dongle/comms module. For BMS comms, confirm the battery is powered on and not in deep-discharge protection.
Source:LUX-Y-48100HG01MN User manual 358-S010025-03 0325(V2.0).pdf· page 27
CauseSuspected short circuit on the output bus or a pre-charge 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-Y-48100HG01MN User manual 358-S010025-03 0325(V2.0).pdf· page 27
CauseSlave module firmware incompatible with the master controller.
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-48100HG01MN User manual 358-S010025-03 0325(V2.0).pdf· page 27
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 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-48100HG01MN User manual 358-S010025-03 0325(V2.0).pdf· page 27
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 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-48100HG01MN User manual 358-S010025-03 0325(V2.0).pdf· page 27
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 fixThis requires service — the relay assembly is not user-replaceable. Record the exact fault code and contact your installer or the manufacturer's service line. Do not bypass any safety interlock.
Source:LUX-Y-48100HG01MN User manual 358-S010025-03 0325(V2.0).pdf· page 27
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.