This is the complete fault table for the Felicity FLA48500 Battery — all 14 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.
Battery overvoltage protection triggered (pack-level voltage exceeded threshold).
CauseBattery pack voltage above operating limit (operating range 44.8-57.6V; max charging voltage 57.6V).
Recommended fixRestart the unit. if the error persists, contact the repair center.
Source:felicitysolar FLA48500 LiFePO4 Battery System for Households User Guide.pdf
Battery undervoltage protection triggered (pack-level voltage below threshold).
CauseBattery pack voltage below cut-off (cut-off voltage 48V); over-discharge condition.
Recommended fixRestart the unit. if the error persists, contact the repair center.
Source:felicitysolar FLA48500 LiFePO4 Battery System for Households User Guide.pdf
Individual cell overvoltage protection triggered.
CauseOne or more cells exceeded the per-cell upper voltage limit.
Recommended fixRestart the unit. if the error persists, contact the repair center.
Source:felicitysolar FLA48500 LiFePO4 Battery System for Households User Guide.pdf
Individual cell undervoltage protection triggered.
CauseOne or more cells dropped below the per-cell lower voltage limit.
Recommended fixRestart the unit. if the error persists, contact the repair center.
Source:felicitysolar FLA48500 LiFePO4 Battery System for Households User Guide.pdf
Charging current exceeded the allowable limit.
CauseCharge current above recommended (≤200A continuous, 300A 15s peak).
Recommended fixRestart the unit. if the error persists, contact the repair center.
Source:felicitysolar FLA48500 LiFePO4 Battery System for Households User Guide.pdf
Discharging current exceeded the allowable limit.
CauseDischarge current above recommended (≤200A continuous, 300A 15s peak).
Recommended fixRestart the unit. if the error persists, contact the repair center.
Source:felicitysolar FLA48500 LiFePO4 Battery System for Households User Guide.pdf
MOSFET (BMS power switch) over-temperature protection.
Cause1. The inner temperature is over the limitation. 2. Check whether the ambient temperature is too high.
Recommended fixReduce ambient temperature / improve ventilation; restart the unit. if the error persists, return to repair center.
Source:felicitysolar FLA48500 LiFePO4 Battery System for Households User Guide.pdf
MOSFET (BMS power switch) under-temperature protection.
Cause1. The internal temperature is lower than the limit range. 2. Check whether the ambient temperature is too low.
Recommended fixRaise ambient temperature into operating range (charging 0-55°C; discharging -20-55°C); restart the unit. if the error persists, return to repair center.
Source:felicitysolar FLA48500 LiFePO4 Battery System for Households User Guide.pdf
Battery cell over-temperature protection triggered.
CauseCell temperature exceeded upper limit (charging temperature range 0-55°C, discharging -20-55°C).
Recommended fixRestart the unit. if the error persists, contact the repair center.
Source:felicitysolar FLA48500 LiFePO4 Battery System for Households User Guide.pdf
Battery cell under-temperature protection triggered.
CauseCell temperature below lower limit.
Recommended fixRestart the unit. if the error persists, contact the repair center.
Source:felicitysolar FLA48500 LiFePO4 Battery System for Households User Guide.pdf
Internal current measurement / sampling circuit abnormal.
CauseHardware/sensor abnormality in current sampling path.
Recommended fixRestart the unit. if the error persists, contact the repair center.
Source:felicitysolar FLA48500 LiFePO4 Battery System for Households User Guide.pdf
Output impedance abnormal.
CauseAbnormal impedance detected on output (possible bad connection, contactor or wiring issue).
Recommended fixRestart the unit. if the error persists, contact the repair center.
Source:felicitysolar FLA48500 LiFePO4 Battery System for Households User Guide.pdf
Parallel connection / parallel-mode start-up failed.
CauseParallel condition not satisfied (e.g. pack-to-pack voltage difference ≥3V, or wiring issue between paralleled units).
Recommended fix1. Please check if single unit is installed in 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:felicitysolar FLA48500 LiFePO4 Battery System for Households User Guide.pdf
Output loss / no output detected.
CauseBreaker open, blown fuse, or output path interrupted.
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:felicitysolar FLA48500 LiFePO4 Battery System for Households User Guide.pdf
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.