Fault

C02

Battery undervoltage.

17 Devices that report this code

What does the C02 error code mean?

C02 on a Felicity unit indicates: Battery undervoltage.. It is a fault-severity event that can appear on 17 different devices in the Felicity catalog. The same code may have slightly different recommended fixes depending on the device — the per-device sections below show the exact wording from each device's official manual.

This is a fault-severity code

Fault codes stop normal operation but the unit may attempt to recover. Common causes are out-of-range conditions (voltage, current, temperature) that require checking inputs and outputs before restart.

What triggers this code

C02 is triggered when the unit's protection or monitoring logic detects the specific condition described above. The exact trigger depends on the device — see the per-device sections for the official manual entry for each.

FLA12100Battery↗ view on device
C02Battery undervoltage.Fault
Description

Battery undervoltage fault. LED pattern: LED1 OFF, LED2 ON, LED3 OFF, LED4 OFF.

Recommended fix

Restart the unit. if the error persists, contact the repair center.

Source:Felicitysolar FLA12100 12.5Kwh Battery Energy Storage System User Manual.pdf · page 1
FLA48200Battery↗ view on device
C02Battery undervoltage.Fault— high
Description

Total battery pack voltage dropped below the lower limit.

Recommended fix

Restart the unit. if the error persists, contact the repair center.

Source:Felicitysolar FLA48200 48V 200Ah 10kWh Lithium Phosphate Battery User Manual.pdf · page 12
FLA48250Battery↗ view on device
C02Battery undervoltage.Critical
Description

BMS reports total battery pack voltage below the lower protection threshold.

Recommended fix

Restart the unit. if the error persists, contact the repair center.

Source:6peluqppy_66a93554057c8.pdf · page 12
FLA48250-EUBattery↗ view on device
C02C02Fault
Description

Battery undervoltage.

Recommended fix

Restart the unit. if the error persists, contact the repair center.

Source:FLA48250-EU_Manual.pdf · page 8
FLA48500Battery↗ view on device
C02Battery undervoltage.Fault
Description

Battery undervoltage protection triggered (pack-level voltage below threshold).

Cause

Battery pack voltage below cut-off (cut-off voltage 48V); over-discharge condition.

Recommended fix

Restart the unit. if the error persists, contact the repair center.

Source:felicitysolar FLA48500 LiFePO4 Battery System for Households User Guide.pdf
FLS48100SG2Battery↗ view on device
C02Batterie-Unterspannung.Fault
Description

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 (Tiefentladeschutz ausgelöst).

Recommended fix

Restart the unit. if the error persists, return to repair centre. (Gerät neu starten; bei Wiederauftreten zur Reparatur einsenden.) Recharge within 18 hours after over-discharge protection.

Source:Benutzerhandbuch - Felicity FLS48100SG2.pdf
HE-GF-FLA-48500Battery↗ view on device
C02Battery undervoltage.Fault
Description

Battery undervoltage protection triggered (pack-level voltage below threshold).

Cause

Battery pack voltage below cut-off (cut-off voltage 48V); over-discharge condition.

Recommended fix

Restart the unit. if the error persists, contact the repair center.

Source:HE-GF-FLA-48500 Manual_20250327_EN.pdf
LPBF48100-MBattery↗ view on device
C02Battery undervoltage.Fault
Description

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.

Recommended fix

Restart the unit, if the error persists, contact the repair center. Stop the load and recharge from mains or PV as soon as possible (page 1 Special Attention).

Source:358-010291-07.pdf · page 8
LPBF48200-HBattery↗ view on device
C02Battery undervoltage.Fault
Description

Battery pack overall voltage below protection threshold (BMS protection).

Cause

Total battery voltage has fallen below the BMS lower voltage limit (over-discharge).

Recommended fix

Restart the unit; if the error persists, contact the repair center.

Source:Manual-LPBF48200-H.pdf · page 10
LPBF48350Battery↗ view on device
C02C02Fault
Recommended fix

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
LUX-E-48100LG03Battery↗ view on device
C02Battery undervoltage.Fault
Cause

Battery pack voltage fell below the lower protection threshold.

Recommended fix

Restart the unit. if the error persists, contact the repair center.

Source:LUX-E-48100LG03-Lithium-Battery-User-Guide.pdf · page 12
LUX-E-48200LG03Battery↗ view on device
C02C02Fault
Recommended fix

Restart the unit. if the error persists, contact the repair center.

Source:LUX-E-48200LG03-Lithium-Battery-User-Guide.pdf · page 12
LUX-E-48230LG03Battery↗ view on device
C02C02Fault
Recommended fix

Restart the unit. if the error persists, contact the repair center.

Source:LUX-E-48230.250LG03-Lithium-Battery-User-Guide.pdf
LUX-X-48050LG01Battery↗ view on device
C02C02Fault
Description

Battery undervoltage.

Recommended fix

Restart the unit, if the error persists, contact the repair center.

Source:LUX-X-48050LG01-low-voltage-battery-user-guide.pdf · page 17
LUX-X-48100LG01Battery↗ view on device
C02Battery undervoltage.Critical
Description

Total battery pack voltage has dropped below the lower protection threshold.

Recommended fix

Restart the unit; if the error persists, contact the repair center.

Source:LUX-X-48100LG01-Litium-Battery-User-Guide.pdf · page 17
LUX-X-48100LG01-USBattery↗ view on device
C02Battery undervoltage.Critical
Description

Total battery pack voltage has dropped below the lower protection threshold.

Recommended fix

Restart the unit, if the error persists, contact the repair center.

Source:358-S010024-03LUX-X-48100LG01-User-manual_compressed.pdf · page 23
LUX-Y-48280LG01Battery↗ view on device
C02Battery undervoltage.Fault
Cause

Battery pack voltage fell below the lower protection threshold.

Recommended fix

Restart the unit. if the error persists, contact the repair center.

Source:LUX-Y-4828048300LG01-Lithium-Battery-User-Guide.pdf · page 8

Frequently asked about C02

What is the C02 error on Felicity?
C02 on a Felicity unit means: Battery undervoltage.. It can appear on 17 different devices in the Felicity catalog. The cause and recommended fix are listed for each device on this page.
Can I clear the C02 code myself?
It depends on the severity. Warning-level codes can usually be cleared by following the recommended fix. Fault and critical codes often require checking the source condition first; if the code returns immediately after restart, escalate to authorized service.
Is the C02 fix the same on every device?
The cause is consistent — it's the same protection logic. The exact fix wording can differ per device because each official manual addresses model-specific context (input ranges, parallel-config notes, firmware revisions). Use the per-device section that matches your unit.
Where does this information come from?
Every entry is sourced directly from the official Felicity user manual for the affected device. The "Source" line at the bottom of each device's section shows the manual filename and page number.

Compiled from official Felicity user manuals. Always consult your device manual and a qualified technician before performing repairs.