Fault

LED1=OFF, LED2=ON, LED3=OFF, LED4=OFF

Battery Voltage Low.

2 Devices that report this code
FLB48314TG1Battery↗ view on device
LED1=OFF, LED2=ON, LED3=OFF, LED4=OFFBattery Voltage Low.Fault
Description

Total battery pack voltage fell below the rated/protection value. Over-discharge protection activated; system stops supplying power externally.

Source:Felicity-FLB48314TG1-Manual.pdf
LPBF24200-MBattery↗ view on device
LED1=OFF, LED2=ON, LED3=OFF, LED4=OFFBattery Voltage Low.Warning
Description

Pack-level battery voltage is below the lower threshold (under-voltage / low-pack warning).

Cause

Excessive discharge or extended period without charging; pack approaching the cut-off voltage (24 V / 48 V).

Recommended fix

Charge the battery as soon as possible from mains or PV. The manual warns repeatedly that an over-discharged pack may fail to be re-activated by normal AC/PV wake-up.

Source:Felicitysolar LPBF24200-M LiFePO4 Battery System for Households User Guide.pdf · page 9

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