C13Fault

Felicity battery error C13

Parallel failed

Fault — the battery enters fault protection and stops normal operation until the fault is cleared — how it is shown (LED pattern or display code) depends on the model.

Severity differs by model — check your model below.

The exact meaning depends on your model:

FLA12100

BatteryFault

What it means

Parallel failed — 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.

How to fix it

  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, p.1

FLA48200

BatteryFault

What it means

Parallel failed — Parallel installation failed; battery cannot establish parallel communication or balance with other packs.

Cause: Improper parallel installation or incorrect wire connections between the battery packs in parallel.

How to fix it

  1. Please check if single unit is installed to parallel system
  2. If this error happens during parallel installation, please check wires connection. if they are connected correctly, please finish parallel installation first, and then restart the unit
  3. If the problem remains, please contact your installer.

Source: Felicitysolar FLA48200 48V 200Ah 10kWh Lithium Phosphate Battery User Manual.pdf, p.13

FLA48250

BatteryCritical

What it means

Parallel failed — Battery pack failed to establish or maintain parallel operation with other packs.

Cause: Single unit may be incorrectly set to parallel system; or wiring between parallel-connected battery packs is incorrect/incomplete.

How to fix it

  1. Please check if a single unit is installed to the parallel system
  2. If this error happens during parallel installation, please check wires connection. if they are connected correctly, please finish parallel installation first, and then restart the unit
  3. If the problem remains, please contact your installer.

Source: 6peluqppy_66a93554057c8.pdf, p.13

FLA48250-EU

BatteryFault

What it means

C13 — Parallel failed.

Cause: A single unit may be installed to a parallel system, or the wiring connection between parallel units is incorrect or incomplete.

How to fix it

  1. Please check if single unit is installed to parallel system
  2. If this error happens during parallel installation, please check wires connection. if they are connected correctly, please finish parallel installation first, and then restart the unit
  3. If the problem remains, please contact your installer.

Source: FLA48250-EU_Manual.pdf, p.8

FLA48500

BatteryFault

Also applies to:HE-GF-FLA-48500

What it means

Parallel failed — Parallel connection / parallel-mode start-up failed.

Cause: Parallel condition not satisfied (e.g. pack-to-pack voltage difference ≥3V, or wiring issue between paralleled units).

How to fix it

  1. Please check if single unit is installed in parallel system
  2. If this error happens during parallel installation, please check wires connection. if they are connected correctly, please finish parallel installation first, and then Restart the unit
  3. If the problem remains, please contact your installer.

Source: felicitysolar FLA48500 LiFePO4 Battery System for Households User Guide.pdf · HE-GF-FLA-48500 Manual_20250327_EN.pdf

FLS48100SG2

BatteryFault

What it means

Parallelbetrieb fehlgeschlagen — Parallel failed. The battery could not establish a valid parallel configuration with other units.

Cause: Parallel-installation error: single unit reporting parallel state, mis-wired parallel cabling, or incorrect DIP-switch IDs.

How to fix it

  1. Check whether a single unit was incorrectly installed in a parallel system
  2. If the error happens during parallel installation, check wire connections; if connected correctly, finish parallel installation first then restart
  3. If the problem remains, contact your installer. Verify DIP-switch addresses per the DIP code table.

Source: Benutzerhandbuch - Felicity FLS48100SG2.pdf

LPBF48100-M

BatteryFault

What it means

Parallel failed — Parallel-mode communication / configuration failure displayed on the LCD BMS fault code / flag screen (section 4.4). Applies when the LPBF48100-M is operated in parallel (up to 6 units / 30 kWh per section 2.3).

Cause: Single unit installed but the system is configured for parallel operation; or a wiring fault between parallel-connected packs (parallel cable / communication cable / DIP-switch address mis-set per section 4.5). Section 4.5 notes that for parallel operation, battery pack IDs must be set to 1-15 via DIP switches SW1-SW4 and SW5 must be ON for termination on the end pack(s).

How to fix it

  1. Please check if single unit is installed to parallel system
  2. If this error happens during parallel installation, please check wires connection. if they are connected correctly, please finish parallel installation first, and then restart the unit
  3. If the problem remains, please contact your installer.

Source: 358-010291-07.pdf, p.9

LPBF48200-H

BatteryFault

Also applies to:LPBF48100-H

What it means

Parallel failed — Battery pack could not satisfy parallel-operation conditions (e.g. voltage difference between local and other packs >3V, or wiring issue).

Cause: Single unit configured as parallel slave, mis-wired parallel connection, or voltage mismatch (>3V) between paralleled packs.

How to fix it

  1. Please check if single unit is installed to parallel system
  2. If this error happens during parallel installation, please check wires connection. if they are connected correctly, please finish parallel installation first, and then restart the unit
  3. If the problem remains, please contact your installer.

Source: Manual-LPBF48200-H.pdf, p.10

LPBF48350

BatteryFault

What it means

C13

Cause: 1. Please check if single unit is installed to parallel system. 2. if this error happens during parallel installation, please check wires connection. if they are connected correctly, please finish parallel installation first, and t hen Restart the unit. 3. if the problem remains, please contact your installer.

How to fix it

Per the manual: verify whether a single unit is installed in a parallel system; if the error occurs during parallel installation, check wiring connections, complete parallel installation, then restart the unit; if the problem persists, contact your installer.

Source: Felicitysolar LPBF48350 17.5kWh 48V Solar Battery Pack with BMS User Guide.pdf

LUX-E-48100LG03

BatteryFault

What it means

Parallel failed

Cause: Parallel-connection condition not satisfied. Possible causes: (1) a single unit is configured as part of a parallel system; (2) wires are mis-connected during parallel installation.

How to fix it

  1. Check if a single unit is wrongly installed to a parallel system
  2. If the error happens during parallel installation, check wires connection. if they are connected correctly, finish parallel installation first, then restart the unit
  3. If the problem remains, please contact your installer.

Source: LUX-E-48100LG03-Lithium-Battery-User-Guide.pdf, p.13

LUX-E-48200LG03

BatteryFault

What it means

C13

Cause: Parallel failed — a single unit is installed to a parallel system, or the wiring between paralleled units is incorrect or incomplete.

How to fix it

  1. Please check if single unit is installed to parallel system
  2. If this error happens during parallel installation, please check wires connection. if they are connected correctly, please finish parallel installation first, and then restart the unit
  3. If the problem remains, please contact your installer.

Source: LUX-E-48200LG03-Lithium-Battery-User-Guide.pdf, p.13

LUX-E-48230LG03

BatteryFault

Also applies to:LUX-E-48250LG03

What it means

C13

Cause: Single unit may be installed to a parallel system, or wiring during parallel installation may be incorrect.

How to fix it

  1. Please check if single unit is installed to parallel system
  2. If this error happens during parallel installation, please check wires connection. if they are connected correctly, please finish parallel installation first, and then restart the unit
  3. If the problem remains, please contact your installer.

Source: LUX-E-48230.250LG03-Lithium-Battery-User-Guide.pdf

LUX-X-48100LG01

BatteryWarning

Also applies to:LUX-X-48100LCG01LUX-X-48100LMG01

What it means

Parallel failed — Parallel-mode handshake/operation between battery packs failed.

Cause: 1. Check whether a single unit is wrongly installed into a parallel system. 2. if error happens during parallel installation, wires may be misconnected.

How to fix it

  1. Please check if single unit is installed to parallel system
  2. If this error happens during parallel installation, please check wires connection. if they are connected correctly, please finish parallel installation first, and then restart the unit
  3. If the problem remains, please contact your installer.

Source: LUX-X-48100LG01-Litium-Battery-User-Guide.pdf, p.17

LUX-X-48100LG01-US

BatteryWarning

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

Parallel failed — Parallel-mode handshake/operation between battery packs failed.

Cause: Either a single unit is wrongly configured for parallel operation, or wires are misconnected during parallel installation.

How to fix it

  1. Please check if single unit is installed to parallel system
  2. If this error happens during parallel installation, please check wires connection. if they are connected correctly, please finish parallel installation first, and then restart the unit
  3. If the problem remains, please contact your installer.

Source: 358-S010024-03LUX-X-48100LG01-User-manual_compressed.pdf, p.23

LUX-Y-48280LG01

BatteryFault

Also applies to:LUX-Y-48300LG01

What it means

Parallel failed

Cause: Parallel-connection condition not satisfied. Possible causes: (1) a single unit is configured as part of a parallel system; (2) wires are mis-connected during parallel installation.

How to fix it

  1. Please check if single unit is installed in parallel system
  2. If this error happens during parallel installation, please check wires connection. if they are connected correctly, please finish parallel installation first, and then restart the unit
  3. If the problem remains, please contact your installer.

Source: LUX-Y-4828048300LG01-Lithium-Battery-User-Guide.pdf, p.8

Frequently asked questions

What does error C13 mean on a Felicity battery?
It depends on the model — 16 devices use code C13. On the FLA12100 it means: Parallel failed. The card for each model on this page gives its exact meaning and fix.
Is error C13 a fault or a warning?
It depends on the model: on some models C13 is a fault (the unit stops until it is cleared), on others a warning (the unit keeps running). Check the card for your model on this page.
How do I clear or fix error C13?
1. Check if a single unit is installed to a parallel system. The exact steps for each affected model are listed on this page.

Related error codes

Other codes on the FLA12100

All FLA12100 codes

Other codes on the FLA48200

All FLA48200 codes

Other codes on the FLA48250

All FLA48250 codes

Other codes on the FLA48250-EU

All FLA48250-EU codes

Other codes on the FLA48500

All FLA48500 codes All HE-GF-FLA-48500 codes

Other codes on the FLS48100SG2

All FLS48100SG2 codes

Prefer the full written guide? Read the complete Felicity inverter error-code guide

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