Also applies to:FLA48200
What it means
Cell overtemperature
Cause: Inverter internal temperature has exceeded the safe operating threshold. Causes include high ambient temperature, blocked cooling vents, failed cooling fan, or installation in direct sunlight.
How to fix it
- 1Restart the unit.
- 2If the error persists, contact the repair center.
Source: Felicitysolar FLA12100 12.5Kwh Battery Energy Storage System User Manual.pdf, p.1 · Felicitysolar FLA48200 48V 200Ah 10kWh Lithium Phosphate Battery User Manual.pdf, p.13
What it means
Cell overtemperature — Battery cell temperature has exceeded its upper protection threshold.
Cause: Inverter internal temperature has exceeded the safe operating threshold. Causes include high ambient temperature, blocked cooling vents, failed cooling fan, or installation in direct sunlight.
How to fix it
- 1Restart the unit.
- 2If the error persists, contact the repair center.
Source: 6peluqppy_66a93554057c8.pdf, p.13
What it means
C09 — Cell overtemperature.
Cause: Inverter internal temperature has exceeded the safe operating threshold. Causes include high ambient temperature, blocked cooling vents, failed cooling fan, or installation in direct sunlight.
How to fix it
- 1Restart the unit.
- 2If the error persists, contact the repair center.
Source: FLA48250-EU_Manual.pdf, p.8
Also applies to:HE-GF-FLA-48500
What it means
Cell overtemperature — Battery cell over-temperature protection triggered.
Cause: Cell temperature exceeded upper limit (charging temperature range 0-55°C, discharging -20-55°C).
How to fix it
- 1Restart the unit.
- 2If the error persists, contact the repair center.
Source: felicitysolar FLA48500 LiFePO4 Battery System for Households User Guide.pdf · HE-GF-FLA-48500 Manual_20250327_EN.pdf
What it means
Cell overtemperature — Cell overtemperature. Temperature of a battery cell exceeded the upper protection limit.
Cause: Cell temperature above limit. Possibly excessive ambient temperature, high current, or impaired ventilation.
How to fix it
- 1Restart the unit.
- 2If the error persists, return to repair centre.
- 3Verify ambient temperature and ventilation.
Source: Benutzerhandbuch - Felicity FLS48100SG2.pdf
What it means
Single cell overtemperature — Individual-cell over-temperature fault displayed on the LCD BMS fault code / flag screen (section 4.4). Example screen on page 7 shows '52.0V / C09 / 70%' with the fault icon constant.
Cause: Cells heated above the safe operating temperature. Per section 2.3 the discharging temperature range is -20 to +60 degC and the charging temperature range is 0 to +55 degC.
How to fix it
Restart the unit, if the error persists, contact the repair center.
Source: 358-010291-07.pdf, p.9
Also applies to:LPBF48100-H
What it means
Single cell overtemperature — An individual cell temperature has exceeded the operating limit.
Cause: Cell temperature above safe upper threshold (likely high ambient temperature or excessive current).
How to fix it
Restart the unit; if the error persists, contact the repair center.
Source: Manual-LPBF48200-H.pdf, p.10
What it means
C09
Cause: Cell overtemperature — a battery cell exceeded the upper temperature protection limit, possibly from excessive ambient temperature, high current, or impaired ventilation.
How to fix it
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
Also applies to:LUX-Y-48280LG01LUX-Y-48300LG01
What it means
Cell overtemperature
Cause: An individual cell temperature exceeded the upper protection threshold.
How to fix it
- 1Restart the unit.
- 2If the error persists, contact the repair center.
Source: LUX-E-48100LG03-Lithium-Battery-User-Guide.pdf, p.13 · LUX-Y-4828048300LG01-Lithium-Battery-User-Guide.pdf, p.8
Also applies to:LUX-E-48230LG03LUX-E-48250LG03
What it means
C09
Cause: Cell overtemperature — a battery cell exceeded the upper temperature protection limit, possibly from excessive ambient temperature, high current, or impaired ventilation.
How to fix it
- 1Restart the unit.
- 2If the error persists, contact the repair center.
Source: LUX-E-48200LG03-Lithium-Battery-User-Guide.pdf, p.13 · LUX-E-48230.250LG03-Lithium-Battery-User-Guide.pdf
Also applies to:LUX-X-48050LCG01LUX-X-48050LMG01LUX-X-48050LG01M2LUX-X-48050LG01M3LUX-X-48050LG01M4
What it means
C09 — Cell overtemperature.
Cause: Inverter internal temperature has exceeded the safe operating threshold. Causes include high ambient temperature, blocked cooling vents, failed cooling fan, or installation in direct sunlight.
How to fix it
Restart the unit, if the error persists, contact the repair center.
Source: LUX-X-48050LG01-low-voltage-battery-user-guide.pdf, p.17
Also applies to:LUX-X-48100LCG01LUX-X-48100LMG01
What it means
Cell overtemperature — A battery cell temperature has exceeded the upper protection limit.
Cause: Inverter internal temperature has exceeded the safe operating threshold. Causes include high ambient temperature, blocked cooling vents, failed cooling fan, or installation in direct sunlight.
How to fix it
Restart the unit; if the error persists, contact the repair center.
Source: LUX-X-48100LG01-Litium-Battery-User-Guide.pdf, p.17
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
Cell overtemperature — A battery cell temperature has exceeded the upper protection limit.
Cause: Inverter internal temperature has exceeded the safe operating threshold. Causes include high ambient temperature, blocked cooling vents, failed cooling fan, or installation in direct sunlight.
How to fix it
Restart the unit, if the error persists, contact the repair center.
Source: 358-S010024-03LUX-X-48100LG01-User-manual_compressed.pdf, p.23