This is the complete fault table for the Felicity FLA48250-EU 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.
CauseThe total battery pack voltage rose above its rated protection value during charging, so the BMS stopped charging. The protection releases once the pack voltage returns to the rated range.
Recommended fixRestart the unit. if the error persists, contact the repair center.
Source:FLA48250-EU_Manual.pdf· page 8
Battery undervoltage.
CauseThe total pack voltage fell below its rated protection value during discharging (over-discharge), so the BMS stopped supplying power. The protection releases once the voltage returns to the rated range.
Recommended fixRestart the unit. if the error persists, contact the repair center.
Source:FLA48250-EU_Manual.pdf· page 8
Cell overvoltage.
CauseAn individual cell reached its over-voltage protection value during charging, typically from cell imbalance letting one cell run ahead of the pack, so the BMS stopped charging.
Recommended fixRestart the unit. if the error persists, contact the repair center.
Source:FLA48250-EU_Manual.pdf· page 8
Cell undervoltage.
CauseAn individual cell fell below its under-voltage protection value during discharging, usually deep discharge or a weak, imbalanced cell, so the BMS stopped supplying power.
Recommended fixRestart the unit. if the error persists, contact the repair center.
Source:FLA48250-EU_Manual.pdf· page 8
Charge overcurrent.
CauseThe charging current reached the BMS trigger value and stayed there for 15 seconds, activating charge overcurrent protection: the charger or inverter is pushing more current than the pack accepts. The battery disables both charging input and discharging output while in fault mode.
Recommended fixRestart the unit. if the error persists, contact the repair center. When the charging current reaches the trigger value and lasts for 15 seconds, charging overcurrent protection is activated, entering fault mode. The battery disables both charging input and discharging output. The fault is automatically cleared after 1 minute. After 10 occurrences, the fault can no longer clear automatically, requiring a manual battery restart.
Source:FLA48250-EU_Manual.pdf
Discharge overcurrent.
CauseThe discharging current reached the BMS trigger value and stayed there for 15 seconds, activating discharge overcurrent protection: the load or inverter is drawing more current than the pack's discharge limit. The battery disables both charging input and discharging output while in fault mode.
Recommended fixRestart the unit. if the error persists, contact the repair center. When the discharging current reaches the trigger value and lasts for 15 seconds, discharging overcurrent protection is activated, entering fault mode. The battery disables both charging input and discharging output. The fault is automatically cleared after 1 minute. After 10 occurrences, the fault can no longer clear automatically, requiring a manual battery restart.
Source:FLA48250-EU_Manual.pdf
MOS overtemperature.
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 fix1. The inner temperature is over the limitation. 2. Check whether the ambient temperature is too high.
Source:FLA48250-EU_Manual.pdf· page 8
MOS undertemperature.
CauseInverter ambient temperature is below the minimum operating range. Most common in unheated outdoor installs in winter.
Recommended fix1. The internal temperature is lower than the limit range. 2. Check whether the ambient temperature is too low.
Source:FLA48250-EU_Manual.pdf· page 8
Cell overtemperature.
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:FLA48250-EU_Manual.pdf· page 8
Cell undertemperature.
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:FLA48250-EU_Manual.pdf· page 8
Abnormal current sampling.
CauseThe BMS current sensor or its sampling circuit returned an abnormal reading. This is an internal hardware fault in the current-measurement path, not an installation issue.
Recommended fixRestart the unit. if the error persists, contact the repair center.
Source:FLA48250-EU_Manual.pdf· page 8
Abnormal output impedance.
CauseThe BMS measured abnormal impedance on the battery's output path, commonly a loose or corroded output terminal connection, or a contactor or wiring issue.
Recommended fixRestart the unit. if the error persists, contact the repair center.
Source:FLA48250-EU_Manual.pdf· page 8
Parallel failed.
CauseA single unit may be installed to a parallel system, or the wiring connection between parallel units is incorrect or incomplete.
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:FLA48250-EU_Manual.pdf· page 8
Output loss.
CauseThe battery's output path is interrupted: the circuit breaker is open or the fuse has blown.
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:FLA48250-EU_Manual.pdf· page 8
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.