MOS undertemperature
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.
The exact meaning depends on your model:
MOS undertemperature — 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.
Check whether the ambient temperature is too low.
Source: Felicitysolar FLA12100 12.5Kwh Battery Energy Storage System User Manual.pdf, p.1
MOS undertemperature — MOSFET temperature is too low.
Cause: 1. The internal temperature is lower than the limit range. 2. Ambient temperature is too low.
Check whether the ambient temperature is too low.
Source: Felicitysolar FLA48200 48V 200Ah 10kWh Lithium Phosphate Battery User Manual.pdf, p.12
MOS undertemperature — MOSFET (power switch) temperature is below the protection limit.
Cause: 1. The internal temperature is lower than the limit range. 2. Check whether the ambient temperature is too low.
Raise ambient/inner temperature; verify ambient temperature is within the operating range.
Source: 6peluqppy_66a93554057c8.pdf, p.12
Also applies to:LUX-X-48050LG01LUX-X-48050LCG01LUX-X-48050LMG01LUX-X-48050LG01M2LUX-X-48050LG01M3LUX-X-48050LG01M4
C08 — MOS undertemperature.
Cause: Inverter ambient temperature is below the minimum operating range. Most common in unheated outdoor installs in winter.
Source: FLA48250-EU_Manual.pdf, p.8 · LUX-X-48050LG01-low-voltage-battery-user-guide.pdf, p.17
Also applies to:HE-GF-FLA-48500
MOS undertemperature — MOSFET (BMS power switch) under-temperature protection.
Cause: 1. The internal temperature is lower than the limit range. 2. Check whether the ambient temperature is too low.
Source: felicitysolar FLA48500 LiFePO4 Battery System for Households User Guide.pdf · HE-GF-FLA-48500 Manual_20250327_EN.pdf
MOS-Untertemperatur — MOS (MOSFET) undertemperature. Internal MOSFET temperature is below the lower limit.
Cause: 1. The internal temperature is lower than the limit range. 2. Ambient temperature may be too low.
Source: Benutzerhandbuch - Felicity FLS48100SG2.pdf
MOS tube undertemperature — MOSFET / BMS power-stage under-temperature fault displayed on the LCD BMS fault code / flag screen (section 4.4).
Cause: 1. The internal temperature is lower than the limit range. 2. Check whether the ambient temperature is too low. (Per section 1.3 item 13 the unit must not be installed below 0 degC; charging range per section 2.3 is 0-55 degC.).
Source: 358-010291-07.pdf, p.8
Also applies to:LPBF48100-H
MOS tube undertemperature — MOSFET (power switch) temperature is below the operating limit.
Cause: Internal temperature is lower than the limit range; ambient temperature may be too low.
Source: Manual-LPBF48200-H.pdf, p.10
C08
Cause: MOS undertemperature — the internal (MOSFET) temperature is lower than the limit range; the ambient temperature may be too low.
Source: Felicitysolar LPBF48350 17.5kWh 48V Solar Battery Pack with BMS User Guide.pdf
Also applies to:LUX-Y-48280LG01LUX-Y-48300LG01
MOS undertemperature
Cause: The internal temperature is lower than the limit range. Check whether the ambient temperature is too low.
Source: LUX-E-48100LG03-Lithium-Battery-User-Guide.pdf, p.12 · LUX-Y-4828048300LG01-Lithium-Battery-User-Guide.pdf, p.8
C08
Cause: 1. The internal temperature is lower than the limit range. 2. Check whether the ambient temperature is too low.
Source: LUX-E-48200LG03-Lithium-Battery-User-Guide.pdf, p.12
Also applies to:LUX-E-48250LG03
C08
Cause: 1. The internal temperature is lower than the limit range. 2. Ambient temperature may be too low.
Check whether the ambient temperature is too low.
Source: LUX-E-48230.250LG03-Lithium-Battery-User-Guide.pdf
Also applies to:LUX-X-48100LCG01LUX-X-48100LMG01LUX-X-48100LG01-USLUX-X-48100LCG01-USLUX-X-48100LMG01-USLUX-X-48100LG01-USM2LUX-X-48100LG01-USM3LUX-X-48100LG01-USM4+4
MOS undertemperature — MOSFET (power switch) temperature is below the lower protection limit.
Cause: 1. The internal temperature is lower than the limit range. 2. Check whether the ambient temperature is too low.
Raise ambient temperature above the operating minimum; if the error persists, return to repair center.
Source: LUX-X-48100LG01-Litium-Battery-User-Guide.pdf, p.17 · 358-S010024-03LUX-X-48100LG01-User-manual_compressed.pdf, p.23
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.