Also applies to:FLA48200
What it means
Battery undervoltage
Cause: The 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.
How to fix it
- 1Restart the unit.
- 2If the error persists, contact the repair center.
Source: Felicitysolar FLA12100 12.5Kwh Battery Energy Storage System User Manual.pdf, p.1 · Felicitysolar FLA48200 48V 200Ah 10kWh Lithium Phosphate Battery User Manual.pdf, p.12
What it means
Battery undervoltage — BMS reports total battery pack voltage below the lower protection threshold.
Cause: The 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.
How to fix it
- 1Restart the unit.
- 2If the error persists, contact the repair center.
Source: 6peluqppy_66a93554057c8.pdf, p.12
What it means
C02 — Battery undervoltage.
Cause: The 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.
How to fix it
- 1Restart the unit.
- 2If the error persists, contact the repair center.
Source: FLA48250-EU_Manual.pdf, p.8
Also applies to:HE-GF-FLA-48500
What it means
Battery undervoltage — Battery undervoltage protection triggered (pack-level voltage below threshold).
Cause: Battery pack voltage below cut-off (cut-off voltage 48V); over-discharge condition.
How to fix it
- 1Restart the unit.
- 2If the error persists, contact the repair center.
Source: felicitysolar FLA48500 LiFePO4 Battery System for Households User Guide.pdf · HE-GF-FLA-48500 Manual_20250327_EN.pdf
What it means
Batterie-Unterspannung — Battery undervoltage. Total pack voltage fell below the rated lower protection threshold during discharging.
Cause: Over-discharge protection triggered when total voltage or any cell fell below rated range.
How to fix it
- 1Restart the unit.
- 2If the error persists, return to repair centre.
- 3Recharge within 18 hours after over-discharge protection.
Source: Benutzerhandbuch - Felicity FLS48100SG2.pdf
What it means
Battery undervoltage — Pack-level under-voltage fault displayed on the LCD BMS fault code / flag screen (section 4.4).
Cause: Pack voltage fell below the BMS under-voltage threshold during discharge, typically near the 48 V cut-off voltage (section 2.4). The Special Attention note on page 1 warns that an over-discharged pack cannot be repeatedly activated and may fail to be activated by the AC or PV activation cable.
How to fix it
- 1Restart the unit, if the error persists, contact the repair center.
- 2Stop the load and recharge from mains or PV as soon as possible (page 1 Special Attention).
Source: 358-010291-07.pdf, p.8
Also applies to:LPBF48100-H
What it means
Battery undervoltage — Battery pack overall voltage below protection threshold (BMS protection).
Cause: Total battery voltage has fallen below the BMS lower voltage limit (over-discharge).
How to fix it
Restart the unit; if the error persists, contact the repair center.
Source: Manual-LPBF48200-H.pdf, p.10
What it means
C02
Cause: Battery undervoltage — total pack voltage fell below the lower protection threshold (over-discharge).
How to fix it
Restart the unit, if the error persists, contact the repair center.
Source: Felicitysolar LPBF48350 17.5kWh 48V Solar Battery Pack with BMS User Guide.pdf
Also applies to:LUX-Y-48280LG01LUX-Y-48300LG01
What it means
Battery undervoltage
Cause: Battery pack voltage fell below the lower protection threshold.
How to fix it
- 1Restart the unit.
- 2If the error persists, contact the repair center.
Source: LUX-E-48100LG03-Lithium-Battery-User-Guide.pdf, p.12 · LUX-Y-4828048300LG01-Lithium-Battery-User-Guide.pdf, p.8
Also applies to:LUX-E-48230LG03LUX-E-48250LG03
What it means
C02
Cause: Battery undervoltage — total pack voltage fell below the lower protection threshold (over-discharge).
How to fix it
- 1Restart the unit.
- 2If the error persists, contact the repair center.
Source: LUX-E-48200LG03-Lithium-Battery-User-Guide.pdf, p.12 · LUX-E-48230.250LG03-Lithium-Battery-User-Guide.pdf
Also applies to:LUX-X-48050LCG01LUX-X-48050LMG01LUX-X-48050LG01M2LUX-X-48050LG01M3LUX-X-48050LG01M4
What it means
C02 — Battery undervoltage.
Cause: Total battery pack voltage fell below the lower protection threshold — an over-discharge condition.
How to fix it
Restart the unit, if the error persists, contact the repair center.
Source: LUX-X-48050LG01-low-voltage-battery-user-guide.pdf, p.17
Also applies to:LUX-X-48100LCG01LUX-X-48100LMG01
What it means
Battery undervoltage — Total battery pack voltage has dropped below the lower protection threshold.
Cause: Total battery pack voltage fell below the lower protection threshold — an over-discharge condition.
How to fix it
Restart the unit; if the error persists, contact the repair center.
Source: LUX-X-48100LG01-Litium-Battery-User-Guide.pdf, p.17
Also applies to:LUX-X-48100LCG01-USLUX-X-48100LMG01-USLUX-X-48100LG01-USM2LUX-X-48100LG01-USM3LUX-X-48100LG01-USM4LUX-X-48100LG01-USM5LUX-X-48100LG01-USM6LUX-X-48100LG01-USM7+1
What it means
Battery undervoltage — Total battery pack voltage has dropped below the lower protection threshold.
Cause: Total battery pack voltage fell below the lower protection threshold — an over-discharge condition.
How to fix it
Restart the unit, if the error persists, contact the repair center.
Source: 358-S010024-03LUX-X-48100LG01-User-manual_compressed.pdf, p.23