This is the complete fault table for the Felicity FLS-ES232LC-S Energy storage system — all 140 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.
CauseVsum > 3.8V × N (N = number of battery strings).
Recommended fixSend faults externally, limit power, request lower high voltage; if command not received within 5s, cut off the main circuit relay. Recovers when Vsum < 3.7V × N.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseVsum < 2.30V × N (N = number of battery strings).
Recommended fixSend faults externally, limit power, request lower high voltage; if command not received within 5s, cut off the main circuit relay. Recovers when Vsum > 2.40V × N.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseInsulation resistance ≤ 100 Ω/V.
Recommended fixSend faults to EMS, limit power, request lower high voltage; if command not received within 5s, cut off the main circuit relay.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseCell temperature spread > 15°C.
Recommended fixSend faults externally, limit power, request lower high voltage; if command not received within 5s, cut off the main circuit relay. Recovers when < 13°C.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseCell voltage spread > 4000 mV.
Recommended fixSend faults externally, limit power, request lower high voltage; if command not received within 5s, cut off the main circuit relay. Recovers when < 3600 mV.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseInvalid internal bus voltage sampling.
Recommended fixSend faults externally, cluster disables insulation detection function with high voltage prohibited. Recovers on normal sampling.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseInvalid external bus voltage sampling.
Recommended fixSend faults externally, limit power and request to lower high voltage; if command not received within 5s, cut off the main circuit relay.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseInvalid insulation sampling partial voltage value.
Recommended fixSend faults externally, cluster disables insulation detection function with high voltage prohibited. Recovers on normal sampling.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseCurrent sampling value reading fails.
Recommended fixSend faults externally, limit power, request lower high voltage; if command not received within 5s, cut off the main circuit relay. Recovers on successful current sampling read.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseSticking failure - main positive relay cannot open.
Recommended fixSend faults externally, limit power, request lower high voltage; if command not received within 5s, cut off the main circuit relay.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseTemp21 or Temp22 on any BMU as judged by SBCU: T > 90°C.
Recommended fixSend faults to EMS, limit power, request lower high voltage; if command not received within 5s, cut off the main circuit relay. Latch - manual troubleshooting is required.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseCell maximum temperature > 60°C.
Recommended fixSend faults externally, limit power and request to lower high voltage; if command not received within 5s, cut off the main circuit relay. Recovers when Temp_max < 55°C.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseCell minimum temperature < -30°C.
Recommended fixSend faults externally, limit power and request to lower high voltage; if command not received within 5s, cut off the main circuit relay. Recovers when Temp_min > 0°C.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseCell voltage > 3,800 mV.
Recommended fixSend faults externally, limit power and request lower high voltage; immediately cut off the main circuit relay. Recovers when < 3,700 mV.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseCell voltage < 2,300 mV.
Recommended fixSend faults externally, limit power and request lower high voltage; immediately cut off the main circuit relay. Recovers when > 2,400 mV.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseCharging current > 130% × allowable current.
Recommended fixSend faults externally, limit power and request lower high voltage; if command not received within 5s, cut off the main circuit relay.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseDischarging current > 130% × allowable current.
Recommended fixSend faults externally, limit power and request lower high voltage; if command not received within 5s, cut off the main circuit relay.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
Cause|Slave plate voltage sum - internal bus voltage| > 40V.
Recommended fixSend faults externally, limit power, request lower high voltage; if command not received within 5s, cut off the main circuit relay.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseBattery cluster SOH < 60%.
Recommended fixSend faults externally, limit power, request lower high voltage; if command not received within 5s, cut off the main circuit relay. Latch - Administrator permissions are required to troubleshoot.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseNo signal received or life signal unchanged.
Recommended fixSend faults externally, limit power and request to lower high voltage; if command not received within 5s, cut off the main circuit relay. Recovers when life signal changed.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseNo signal received or life signal unchanged.
Recommended fixSend faults externally, limit power and request to lower high voltage; if command not received within 5s, cut off the main circuit relay. Recovers when life signal changed.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseNo signal received or life signal unchanged from fire system.
Recommended fixSend faults to EMS, limit power, request lower high voltage; if command not received within 5s, cut off the main circuit relay.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseNo signal received or life signal unchanged.
Recommended fixSend faults to EMS, limit power, request lower high voltage; if command not received within 5s, cut off the main circuit relay.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseNo signal received or life signal unchanged from PCS.
Recommended fixSend faults to EMS, limit power, request lower high voltage; if command not received within 5s, cut off the main circuit relay.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseUnsuccessful reboot of 33772 chip 10 times within 1s.
Recommended fixSend faults to EMS, limit power, request lower high voltage; if command not received within 5s, cut off the main circuit relay. Recovers on communication recovered.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseOpen-circuit fault detected on main positive relay.
Recommended fixSend faults externally, limit power, request lower high voltage; if command not received within 5s, cut off the main circuit relay.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseAfter low voltage applied without enabling relay: DO4 input voltage not 20-32V or DI1/2 feedback state is 0; after enabling relay: DO4 input voltage not 20-32V or DI1/2 feedback state is 1.
Recommended fixSend faults externally, limit power, request lower high voltage; if command not received within 5s, cut off the main circuit relay.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseAnomalous high-voltage state (wakeup loss & EMS communication loss); cut-off with 5s delay and dormant. Trigger: < 9V.
Recommended fixSend faults externally. (1) Non-high-voltage state dormant; (2) Normal high-voltage state hold; (3) Anomalous high-voltage state cut-off. Recovers when ≥ 9V.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseActual voltage quantity does not match software configuration.
Recommended fixSend faults externally, limit power, request lower high voltage; if command not received within 5s, cut off the main circuit relay. Detection starts 10s after Device powered on.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseThermal runaway detected by any of: 1) Vmin<0.5V & Tmax>65°C; 2) Vmin<0.5V & Tmax-Tmin>30°C; 3) Vmin<0.5V & dT/dt>1°C/s; 4) Voltage sampling disconnection fault & Tmax>65°C; 5) Voltage sampling disconnection fault & Tmax-Tmin>30°C; 6) Voltage sampling disconnection fault & dT/dt>1°C/s; Vmin<0.5V & NTC sampling break or short circuit; Aerosol operation (AI1>9V on any BMU as judged by SBCU) & Tmax>65°C; Any BMU air pressure change rate ≥ 0.1 kPa/s.
Recommended fixSend faults externally, limit power, request lower high voltage; if command not received within 5s, cut off the main circuit relay. Latch - manual troubleshooting is required.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseAerosol operation (AI1 > 9V on any BMU as judged by SBCU).
Recommended fixSend faults externally, limit power, request lower high voltage; if command not received within 5s, cut off the main circuit relay.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseQS feedback signal anomaly detected inside SBCU (judgment made only after receiving applying high voltage command).
Recommended fixSend faults externally, limit power, request lower high voltage; if command not received within 5s, cut off the main circuit relay.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseFU1 feedback signal anomaly detected inside SBCU.
Recommended fixSend faults externally, limit power, request lower high voltage; if command not received within 5s, cut off the main circuit relay.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseSBCU detects BJB_NTC > 60°C.
Recommended fixSend faults externally, limit power, request lower high voltage; if command not received within 5s, cut off the main circuit relay. Recovers when BJB_NTC < 50°C.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseRelay drive supply voltage < 22V.
Recommended fixSend faults externally, limit power, request lower high voltage; if command not received within 5s, cut off the main circuit relay. Recovers at ≥ 22V.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseBMS battery alarm received.
Recommended fixAlarm only, the device does not stop.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseVsum > 3.7V × N (N = number of battery strings).
Recommended fixSend faults externally and limit power. Recovers when Vsum < 3.65V × N.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseVsum < 2.40V × N (N = number of battery strings).
Recommended fixSend faults externally and limit power. Recovers when Vsum > 2.50V × N.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseInsulation resistance ≤ 500 Ω/V.
Recommended fixSend faults to EMS and limit power. Recovers when > 600 Ω/V.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseCell temperature spread > 13°C.
Recommended fixSend faults externally and limit power. Recovers when < 8°C.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseCell voltage spread > 3600 mV.
Recommended fixSend faults externally and limit power. Recovers when < 500 mV.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseCell maximum temperature > 55°C.
Recommended fixSend faults externally and limit power. Recovers when Temp_max < 50°C.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseCell minimum temperature < 0°C.
Recommended fixSend faults externally and limit power. Recovers when Temp_min > 5°C.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseCell voltage > 3,700 mV.
Recommended fixSend faults externally and limit power. Recovers when < 3,650 mV.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseCell voltage < 2,400 mV.
Recommended fixSend faults externally and limit power. Recovers when > 2,500 mV.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseCharging current > 110% × allowable current.
Recommended fixSend faults externally and limit power. Recovers when < 105% allowable current.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseDischarging current > 110% × allowable current.
Recommended fixSend faults externally and limit power. Recovers when < 105% allowable current.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CausePower off, loose circuit connection, or compressor damaged.
Recommended fixCheck main power switch and operation display screen; tighten circuit connector; check compressor and replace if damaged.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseWater temperature set too high (no cooling required) or shutdown delay (compressor minimum shutdown time).
Recommended fixCheck inlet/outlet temperature display and reset control temperature. The compressor will restart with delay if temperature rises again.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseInsufficient refrigerant; insufficient water flow; serious dust accumulation in condenser; refrigeration system clogged.
Recommended fixReplenish refrigerant; clean water filter and check water pump; clean condenser; check or replace filter drier.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseWorn fan bearings or fan blades scrape against other objects.
Recommended fixReplace the fan. Check whether any cables interfere with the fan blades.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseFan failure or fan stuck.
Recommended fixCheck the motor and replace it immediately if defects are found. Check whether any foreign matters are stuck in the fan.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseWater temperature set too low (no heating required), loose circuit connection, or electric heating tube burnout.
Recommended fixCheck outlet temperature and heating set point; tighten circuit connector; replace burnt-out heating tube.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseCondenser dirty plugging or external circulation fan does not operate.
Recommended fixClean the condenser. Check the fan.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseLeakage of fluorine or insufficient refrigerant; filter drier clogging; thermal expansion valve failure; water flow rate too low.
Recommended fixLeak check and replenish refrigerant; replace filter drier; check expansion valve and temperature sensing package; fix water system.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CausePower off, loose circuit connection, damaged water pump, or air in cooling medium / no cooling medium.
Recommended fixCheck main power switch; tighten circuit connector; replace damaged water pump; evacuate air or replenish cooling medium.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CausePhase A output overcurrent.
Recommended fixReset to restart. Manual intervention required if fault cannot be rectified. More than 3 faults in one day require manual intervention to confirm grid quality on site.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CausePhase A output quick disconnection.
Recommended fixReset to restart. Manual intervention required if fault cannot be rectified.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CausePhase B output overcurrent.
Recommended fixReset to restart. Manual intervention required if fault cannot be rectified.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CausePhase B output quick disconnection.
Recommended fixReset to restart. Manual intervention required if fault cannot be rectified.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CausePhase C output overcurrent.
Recommended fixReset to restart. Manual intervention required if fault cannot be rectified.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CausePhase C output quick disconnection.
Recommended fixReset to restart. Manual intervention required if fault cannot be rectified.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CausePhase N output quick disconnection.
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:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CausePhase N output quick disconnection (duplicate entry).
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:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseGrid frequency too high.
Recommended fixReset to restart. Check whether grid frequency is beyond range of frequency protection action. Check for AC disconnection or islanding.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseGrid frequency too low.
Recommended fixReset to restart. Check whether grid frequency is beyond range of frequency protection action. Check for AC disconnection or islanding.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseDC charging current exceeded threshold.
Recommended fixReset to restart. Check system power settings do not exceed rated capacity; check actual battery voltage range. More than 3 faults in one day require manual intervention.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseDC discharging current exceeded threshold.
Recommended fixReset to restart. Check system power settings do not exceed rated capacity; check actual battery voltage range. More than 3 faults in one day require manual intervention.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseIslanding condition detected.
Recommended fixReset to restart. Where an islanding is detected, the device is shut down from the on-grid state.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseAC main contactor failed to close.
Recommended fixReset to restart. Does not occur on domestic version. if foreign version reports during startup three consecutive times, contact manufacturer to confirm insulation detection logic and contactor sticking.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseAC main contactor failed to open.
Recommended fixNo alarm is generated for the current device.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseAC soft start failed to close.
Recommended fixNo alarm is generated for the current device.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseAC soft start failed to open.
Recommended fixNo alarm is generated for the current device.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseDC main contactor failed to close.
Recommended fixReset to restart. Does not occur on device adopting 'One Cluster, One Management' approach.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseDC main contactor failed to open.
Recommended fixReset to restart. Does not occur on device adopting 'One Cluster, One Management' approach.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseDC soft start failed to open.
Recommended fixNo alarm is generated for the current device.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseReserved code position in the PCS ARM fault list — not assigned to any protection on this device; no alarm is generated for it.
Recommended fixNo alarm is generated for the current device.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseReserved code position in the PCS ARM fault list — not assigned to any protection on this device; no alarm is generated for it.
Recommended fixNo alarm is generated for the current device.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseStart-up preconditions failed.
Recommended fixReset to restart. Check whether off-grid and on-grid setting matches actual wiring; after disconnecting from grid with no load, wait for AC terminal voltage to drop to near 0 before starting again.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseSwitch fault during operation.
Recommended fixNo alarm is generated for the current device.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseInverter did not start within timeout.
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:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseParameter setting error.
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:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseCommunication with BMS lost.
Recommended fixReset to restart. Automatic reset after communication is restored.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseBMS reported abnormal temperature.
Recommended fixNo alarm is generated for the current device.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseCommunication with DCDC lost.
Recommended fixPCS and DCDC communication timeout.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseReserved code position in the PCS ARM fault list — not assigned to any protection on this device.
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:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseReserved code position in the PCS ARM fault list — not assigned to any protection on this device.
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:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseDCDC did not start within timeout.
Recommended fixReset to restart. Check communication cables between PCS and DCDC and the baud rate.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CausePhase A hardware overcurrent detected by FPGA.
Recommended fixReset to restart. More than 3 faults in one day require manual intervention to confirm the grid quality on site.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CausePhase B hardware overcurrent detected by FPGA.
Recommended fixReset to restart. More than 3 faults in one day require manual intervention to confirm the grid quality on site.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CausePhase C hardware overcurrent detected by FPGA.
Recommended fixReset to restart. More than 3 faults in one day require manual intervention to confirm the grid quality on site.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CausePhase N hardware overcurrent detected by FPGA.
Recommended fixReset to restart. More than 3 faults in one day require manual intervention to confirm the grid quality on site.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseReserved code position in the PCS FPGA fault list — not assigned to any protection on this device.
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:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseReserved code position in the PCS FPGA fault list — not assigned to any protection on this device.
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:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseReserved code position in the PCS FPGA fault list — not assigned to any protection on this device.
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:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseReserved code position in the PCS FPGA fault list — not assigned to any protection on this device.
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:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CausePhase A IGBT failure.
Recommended fixNo alarm is generated for the current device.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CausePhase B IGBT failure.
Recommended fixNo alarm is generated for the current device.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CausePhase C IGBT failure.
Recommended fixNo alarm is generated for the current device.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CausePhase N IGBT failure.
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:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseReserved code position in the PCS FPGA fault list — not assigned to any protection on this device.
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:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseVsum > 3.65V × N (N = number of battery strings).
Recommended fixSend faults externally. Recovers when Vsum < 3.6V × N.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseVsum < 2.50V × N (N = number of battery strings).
Recommended fixSend faults externally. Recovers when Vsum > 2.60V × N.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseInsulation resistance ≤ 1000 Ω/V.
Recommended fixSend faults to EMS. Recovers when > 1100 Ω/V.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseCell temperature spread > 8°C.
Recommended fixSend faults externally. Recovers when < 6°C.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseCell voltage spread > 500 mV.
Recommended fixSend faults externally. Recovers when < 300 mV.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseBattery cluster SOC < 3% (threshold subject to actual operating conditions).
Recommended fixSend faults externally. Recovers when SOC > 5% (threshold subject to actual operating conditions).
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseInvalid internal bus voltage sampling.
Recommended fixSend faults externally, cluster disables insulation detection function. Recovers on normal sampling.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseCommunication of EE fails while reading or writing.
Recommended fixSend faults externally. Recovers when EE communication succeeds.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseSBCU detects BJB_NTC sampling value as invalid.
Recommended fixSend faults externally. Recovers when BJB_NTC sampling value valid.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseCell maximum temperature > 50°C.
Recommended fixSend faults externally. Recovers when Temp_max < 45°C.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseCell minimum temperature < 5°C.
Recommended fixSend faults externally. Recovers when Temp_min > 10°C.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseCell voltage > 3,650 mV.
Recommended fixSend faults externally. Recovers when < 3,600 mV.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseCell voltage < 2,500 mV.
Recommended fixSend faults externally. Recovers when > 2,600 mV.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseCharging current > 105% × allowable current.
Recommended fixSend faults externally. Recovers when < 100% allowable current.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseDischarging current > 105% × allowable current.
Recommended fixSend faults externally. Recovers when < 100% allowable current.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseAC bus overvoltage.
Recommended fixReset to restart. When AC undervoltage cannot be recovered: 1) Check whether AC switch is disconnected or grid is blacked out; 2) Where there is no disconnection, confirm whether the AC insurance is blown.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseAC bus undervoltage.
Recommended fixReset to restart. Check AC switch and AC fuse.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseOutput side overvoltage (off-grid).
Recommended fixCannot reset to restart. Off-grid output AC overvoltage. Check whether the Device can work with no load.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseOutput side undervoltage (off-grid).
Recommended fixReset to restart. Off-grid output AC undervoltage. Check whether the device is in an overload state.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseVoltage total harmonic distortion exceeds limit.
Recommended fixReset to restart. Check whether THDU of the power grid exceeds 15%; confirm instantaneous power of load is within design range of system distribution.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseLoss of one or more grid phases.
Recommended fixPCS shall be automatically reset and restarted after the fault is rectified on the site. Check whether the wiring misses a phase.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CausePhase sequence reversed/incorrect.
Recommended fixPCS shall be automatically reset and restarted after the fault is rectified on the site. Check correspondence between ABCN phase sequence and the modules.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseDC terminals connected with reversed polarity.
Recommended fixPCS shall be automatically reset and restarted after the fault is rectified on the site. Check the voltage polarity of the PCS DC terminal.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseDC bus overvoltage detected by software.
Recommended fixReset to restart. Measure battery voltage of PCS DC terminal within allowable range; check contactor of high-voltage box, DC fuse, DC soft start. More than 3 faults in one day require manual intervention.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseDC busbar undervoltage detected by software.
Recommended fixReset to restart. Measure battery voltage; check contactor and DC fuse. More than 3 faults in one day require manual intervention.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseDC component exceeds limit.
Recommended fixReset to restart. 1) Report fault to manufacturer. 2) Contact manufacturer if it occurs 2 times in one day.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseDC soft start failed to close.
Recommended fixCannot reset to restart, manual confirmation required. 1) Check DC voltage sampling and calibration deviation. 2) Check whether DC soft start resistance is damaged.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseFerroelectric memory parameter storage error.
Recommended fixCannot reset to restart. Where PCS internal memory is faulty, contact the manufacturer.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseDC soft start failure (general).
Recommended fixReset to restart. Report to manufacturer if it occurs three consecutive times during startup. 1) DC contactor switching-on under judgment, DC voltage difference too large. 2) When running with DCDC, DCDC startup not correct.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseBMS abort signal received.
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:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseCommunication with EMS lost.
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:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseExternal emergency stop signal or internal core failure.
Recommended fixReset to restart, external dry node signal shall disappear.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseBattery overvoltage detected by software.
Recommended fixReset to restart. Measure battery voltage; check contactor of high-voltage box, DC fuse. More than 3 faults in one day require manual intervention.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseBattery undervoltage detected by software.
Recommended fixReset to restart. Measure battery voltage; check contactor of high-voltage box, DC fuse. More than 3 faults in one day require manual intervention.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseBus imbalance detected.
Recommended fixReset to restart. 1) Fault elimination lasts about 1h after DC cut off. 2) if cannot be reset, contact manufacturer for voltage sampling and capacitor aging issues. 3) if reset works but repeatedly reports after startup, contact manufacturer.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseHalf-bus voltage overvoltage.
Recommended fixReset to restart. Measure battery voltage; check contactor and DC fuse. More than 3 faults in one day require manual intervention.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseUnit DC voltage abnormal.
Recommended fixReset to restart. Check whether the contactor of the high-voltage box has been disconnected. if the device fails to start after reset, manual intervention is required to check whether the DC fuse is blown.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseSwitching power supply undervoltage.
Recommended fixReset to restart. Check whether the contactor of the high-voltage box has been disconnected.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.pdf
CauseInternal overtemperature.
Recommended fixReset to restart. if over-temperature persists, consider derating depending on ambient temperature: derate 6kW per degree for ambient temperature over 45 degrees. Check fan operation, over-temperature protection threshold, and whether the container is exposed to sunlight without shade.
Source:fls-es232lc-g-2-fls-es232lc-s-user-guide-en.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.