Overload
Also displayed as F10 on some models.
Fault — the inverter cuts its output and the red LED stays solid until the fault is cleared.
Severity differs by model — check your model below.
The exact meaning depends on your model:
Also applies to:IVCM2024 PROIVCM3024 PRO
Overload
Cause: The connected load is drawing more power than the inverter's rated output capacity.
Source: ICM.pdf, p.13
Also applies to:T-REX-3K6LP1G01T-REX-4KLP1G01T-REX-4K6LP1G01T-REX-5KLP1G01T-REX-6KLP1G01
Abnormal LLC
Cause: The LLC resonant converter (the isolated DC link inside the unit) is operating outside its normal envelope — an internal converter fault rather than a wiring issue.
Restart the unit, if the error persists, contact the repair center.
Source: T-REX-3_3.6_4_4.6_5_6KLP1G01-hybrid-inverter-user-guide-English.pdf, p.37
Also applies to:IVEM6048
Overload time out
Cause: Sustained overload condition.
Reduce the connected load by switching off some equipment.
Source: felicitysolar IVEM 6048 Solar Inverter User Guide.pdf, p.37
Also applies to:IVEM12048-IIIVEM 8K-12K Series II
Overload time out
Cause: Connected load has exceeded the inverter's overload capacity for too long.
Reduce the connected load by switching off some equipment.
Source: IVEM8K-12K-II_compressed.pdf, p.43
Also applies to:IVEM8048
Overload time out
Cause: Connected load exceeds inverter capacity for an extended time.
Reduce the connected load by switching off some equipment.
Source: FelicitySolar IVEM8048-LV Single Phase Hybrid Inverter User Guide.pdf, p.38
PV2 reverse connection fault — Pv2 string positive and negative connection, check the string wiring.
Cause: The PV2 string is connected with positive and negative reversed, so the input stage blocks it until the string wiring is corrected.
Source: T-REX-50KHP3G01-user-manual-.pdf, p.45
Also applies to:Apollo-5KLP1G01-M1Apollo-5KLP1G01-M2Apollo-4K6LP1G01-MXApollo-4K6LP1G01-M1Apollo-4K6LP1G01-M2
Abnormal LLC — Abnormal LLC converter operation.
Cause: The internal LLC DC-DC converter stage is operating abnormally. This is an internal power-conversion fault, not something caused by wiring or settings.
Restart the unit, if the error persists, contact the repair center.
Source: Apollo-5KLP1G01-All-in-one-ESS-User-Guide.pdf, p.42
Cell temperature is too low — Fault event: battery cell temperature fell below its low threshold.
Cause: A battery cell temperature fell below the lower protection limit — the ambient temperature is too low.
Source: LUX-S-1600LG01.pdf, p.22
Also applies to:LUX-X-96050HMG01LUX-X-96050HCG01
Low Cell Temperature — Battery cell temperature is below safe operating limit.
Cause: Cell too cold (ambient temperature below charge/discharge range).
Wait for temperature rise.
Source: LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf, p.21
Also applies to:LUX-Y-48100HCG01LUX-Y-48100HMG01LUX-Y-48100HR13G01LUX-Y-48100HR9G01
Low Cell Temperature — Cell temperature is too low.
Cause: Cell too cold — ambient temperature below the charge/discharge range.
Wait for temperature rise.
Source: LUX-Y-48100HG01-Lithium-Battery-User-Guide.pdf, p.20
Low Cell Temperature
Cause: Cell too cold — ambient temperature below the charge/discharge range.
Source: LUX-Y-48100HG01MN User manual 358-S010025-03 0325(V2.0).pdf, p.27
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.