Can I clear the C10 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 C10 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.

Fault

C10

Q: What does C10 mean on FLA48250-EU?

Cell undertemperature. Recommended fix: Restart the unit. if the error persists, contact the repair center.

Q: What does C10 mean on FLA48500?

Battery cell under-temperature protection triggered. Cause: Cell temperature below lower limit. Recommended fix: Restart the unit. if the error persists, contact the repair center.

Cell undertemperature.

17 Devices that report this code

What does the C10 error code mean?

C10 on a Felicity unit indicates: Cell undertemperature.. 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

C10 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

C10Cell 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 1

FLA48200Battery↗ view on device

C10Cell undertemperature.Fault— high

Description

Cell temperature 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 13

FLA48250Battery↗ view on device

C10Cell undertemperature.Critical

Description

Battery cell temperature has fallen below its lower protection threshold.

Recommended fix

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

Source:6peluqppy_66a93554057c8.pdf · page 13

FLA48250-EUBattery↗ view on device

C10C10Fault

Description

Cell undertemperature.

Recommended fix

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

Source:FLA48250-EU_Manual.pdf · page 8

FLA48500Battery↗ view on device

C10Cell undertemperature.Fault

Description

Battery cell under-temperature protection triggered.

Cause

Cell temperature below lower limit.

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

C10Zell-Untertemperatur.Fault

Description

Cell undertemperature. Temperature of a battery cell is below the lower protection limit.

Cause

Cell temperature below limit (Zellentemperatur unter der Schutzgrenze). Possibly insufficient ambient temperature.

Recommended fix

Restart the unit. if the error persists, return to repair centre. Charge in an environment within the operating temperature range.

Source:Benutzerhandbuch - Felicity FLS48100SG2.pdf

HE-GF-FLA-48500Battery↗ view on device

C10Cell undertemperature.Fault

Description

Battery cell under-temperature protection triggered.

Cause

Cell temperature below lower limit.

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

C10Single cell undertemperature.Fault

Description

Individual-cell under-temperature fault displayed on the LCD BMS fault code / flag screen (section 4.4).

Cause

Cell temperature below the allowed range. Per section 2.3 charging is permitted only between 0 and +55 degC, discharging between -20 and +60 degC.

Recommended fix

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

Source:358-010291-07.pdf · page 9

LPBF48200-HBattery↗ view on device

C10Single cell undertemperature.Fault

Description

An individual cell temperature is below the operating limit.

Cause

Cell temperature below safe lower threshold (likely cold ambient, charging blocked below 0 deg C).

Recommended fix

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

Source:Manual-LPBF48200-H.pdf · page 10

LPBF48350Battery↗ view on device

C10C10Fault

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

C10Cell undertemperature.Fault

Cause

An individual cell temperature 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 13

LUX-E-48200LG03Battery↗ view on device

C10C10Fault

Recommended fix

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

Source:LUX-E-48200LG03-Lithium-Battery-User-Guide.pdf · page 13

LUX-E-48230LG03Battery↗ view on device

C10C10Fault

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

C10C10Fault

Description

Cell undertemperature.

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

C10Cell undertemperature.Critical

Description

A battery cell temperature has dropped below the lower protection limit.

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

C10Cell undertemperature.Critical

Description

A battery cell temperature has dropped below the lower protection limit.

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

C10Cell undertemperature.Fault

Cause

An individual cell temperature 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 C10

What is the C10 error on Felicity?: C10 on a Felicity unit means: Cell undertemperature.. 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 C10 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 C10 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.