About the Felicity FLA12100
The Felicity FLA12100 is a Battery unit. The 14 error codes listed below are the complete fault catalog for this device, compiled from the official Felicity user manual.
FLA12100
Battery14 codes 14 Fault
How to use this page
Each row below shows an error code, its severity, and a brief description. Click any row to expand the full cause and the recommended fix. The severity dot tells you whether the unit will keep operating (warning), derate (fault), or trip offline (critical). For codes that require an authorized service partner, the recommended-fix block says so explicitly.
C01Battery overvoltage.Fault
Description
Battery overvoltage fault. LED pattern: LED1 FLASH, LED2 OFF, LED3 OFF, LED4 OFF (with FAULT mode: GREEN OFF, RED ON).
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 1C02Battery 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 1C03Cell overvoltage.Fault
Description
Cell overvoltage fault. LED pattern: LED1 ON, 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 1C04Cell undervoltage.Fault
Description
Cell undervoltage fault. LED pattern: LED1 OFF, LED2 OFF, LED3 ON, 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 1C05Charge overcurrent.Fault
Description
Charge overcurrent fault. LED pattern: LED1 ON, LED2 OFF, LED3 ON, 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 1C06Discharge overcurrent.Fault
Description
Discharge overcurrent fault. LED pattern: LED1 OFF, LED2 ON, LED3 ON, 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 1C07MOS overtemperature.Fault
Description
MOSFET over-temperature fault. LED pattern: LED1 ON, LED2 ON, LED3 ON, LED4 OFF.
Cause
1. The inner temperature is over the limitation. 2. The ambient temperature may be too high.
Recommended fix
Check whether the ambient temperature is too high.
Source:
Felicitysolar FLA12100 12.5Kwh Battery Energy Storage System User Manual.pdf · page 1C08MOS undertemperature.Fault
Description
MOSFET under-temperature fault. LED pattern: LED1 OFF, LED2 OFF, LED3 OFF, LED4 ON.
Cause
1. The internal temperature is lower than the limit range. 2. The ambient temperature may be too low.
Recommended fix
Check whether the ambient temperature is too low.
Source:
Felicitysolar FLA12100 12.5Kwh Battery Energy Storage System User Manual.pdf · page 1C09Cell overtemperature.Fault
Description
Cell over-temperature fault. LED pattern: LED1 ON, LED2 OFF, LED3 OFF, LED4 ON.
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 1C10Cell undertemperature.Fault
Description
Cell under-temperature fault. LED pattern: LED1 OFF, LED2 ON, LED3 OFF, LED4 ON.
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 1C11Abnormal current sampling.Fault
Description
Abnormal current sampling fault. LED pattern: LED1 ON, LED2 ON, LED3 OFF, LED4 ON.
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 1C12Abnormal output impedance.Fault
Description
Abnormal output impedance fault. LED pattern: LED1 OFF, LED2 OFF, LED3 ON, LED4 ON.
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 1C13Parallel failed.Fault
Description
Parallel connection failure between battery units. LED pattern: LED1 ON, LED2 OFF, LED3 ON, LED4 ON.
Cause
Single unit may be installed to a parallel system, or wiring connection between parallel units is incorrect/incomplete.
Recommended fix
1. Check if a single unit is installed to a parallel system. 2. if this error happens during parallel installation, check wire connections; if connected correctly, finish parallel installation first and then restart the unit. 3. if the problem remains, contact your installer.
Source:
Felicitysolar FLA12100 12.5Kwh Battery Energy Storage System User Manual.pdf · page 1C14Output loss.Fault
Description
Output loss fault. LED pattern: LED1 OFF, LED2 ON, LED3 ON, LED4 ON.
Recommended fix
1. Check whether the circuit breaker is closed. 2. Check whether the fuse is normal. 3. Restart the unit. if the error persists, contact the repair center.
Source:
Felicitysolar FLA12100 12.5Kwh Battery Energy Storage System User Manual.pdf · page 1Step-by-step troubleshooting checklist
- 1.Note the exact code and timing
Write down the exact code shown on the display, what the unit was doing when it appeared (charging, discharging, idle, grid-tied), and any LEDs or audible alarms. The same code can have different fixes depending on context.
- 2.Check the recommended fix on this page
Find the code in the list below and read the cause + recommended fix. Most warning-level codes can be cleared by following the listed action — usually reducing load, checking wiring, or restarting the unit.
- 3.Verify the source manual page
Each code shows the source manual filename and page number. Open that exact page in the official manual to verify model-specific notes (firmware version, parallel-config notes, regional variants) before acting.
- 4.Disconnect AC, DC, and battery before opening
If a fix requires opening the enclosure or accessing terminals, disconnect AC input, DC PV, and battery in that order. Wait at least 60 seconds for capacitors to discharge before touching any conductors.
- 5.Escalate critical codes to authorized service
Critical codes (short-circuit, IGBT failure, BMS hardware error) should not be cleared by end users. Note the code, model number, and source manual page, then contact an authorized service partner.
Common questions about FLA12100 error codes
- Where can I find the official Felicity FLA12100 error code manual?
- Each code on this page lists the official source manual filename and page number at the bottom. The manuals are published by Felicity on their website; we compile the codes here so you can search across all of them at once instead of opening each PDF.
- Is the FLA12100 the same as other Felicity models?
- Some Felicity units share firmware across a family of variants — the same fault codes apply to multiple model numbers. Look at the "also covers" chips below the title to see which other model numbers this page applies to.
- What's the most critical code on a Felicity FLA12100?
- Critical-severity codes (red dot) are the ones that trip the unit offline immediately — typically short-circuit, IGBT, or BMS hardware failures. These are listed first when you filter by severity. Do not bypass them; they indicate a hardware or safety condition that requires service.
Compiled from official Felicity user manuals. Always consult your device manual and a qualified technician before performing repairs.