Inverter voltage soft start fail
Also displayed as F26 on some models.
Fault — the inverter cuts its output and the red LED stays solid until the fault is cleared.
The exact meaning depends on your model:
Also applies to:IVCM2024 PROIVCM3024 PRO
Inverter voltage soft start fail — The soft start of the inverter voltage fails.
Cause: The inverter output voltage failed to ramp up during its soft-start sequence. This is an internal component fault in the inverter stage.
Restart the unit, if the error persists, contact the repair center.
Source: ICM.pdf, p.14
Also applies to:T-REX-3K6LP1G01T-REX-4KLP1G01T-REX-4K6LP1G01T-REX-5KLP1G01T-REX-6KLP1G01
Invert soft start failed — Internal components failed. Invert soft start failed.
Cause: Internal components failed — the inverter stage could not complete its soft-start ramp to the working voltage.
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.38
Also applies to:IVEM6048
Sharing current sensor failed
Cause: Sharing current sensor hardware failure (parallel operation).
Restart the unit, if the error persists, contact the repair center.
Source: felicitysolar IVEM 6048 Solar Inverter User Guide.pdf, p.37
Also applies to:IVEM12048-IIIVEM 8K-12K Series II
Sharing current sensor failed
Cause: Current-sharing sensor failure (parallel system).
Restart the unit, if the error persists, contact the repair center.
Source: IVEM8K-12K-II_compressed.pdf, p.44
Also applies to:IVEM8048
Sharing current sensor failed
Cause: The current-sharing sensor used to balance paralleled units returned an out-of-range or implausible reading, so the inverter can no longer verify how load current is being shared.
Restart the unit, if the error persists, contact the repair center.
Source: FelicitySolar IVEM8048-LV Single Phase Hybrid Inverter User Guide.pdf, p.38
Invert soft start failed — Inverter soft start procedure failed.
Cause: Internal components failed.
Restart the unit, if the error persists, contact the repair center.
Source: T-REX-10KHP3G01-Inverter-User-Guide.pdf, p.28
Also applies to:Apollo-5KLP1G01-MXApollo-5KLP1G01-M1Apollo-5KLP1G01-M2Apollo-4K6LP1G01-MXApollo-4K6LP1G01-M1Apollo-4K6LP1G01-M2
Invert soft start failed
Cause: Internal components failed.
Restart the unit, if the error persists, contact the repair center.
Source: T-REX-10KLP3G01-Inverter-User-Guide.pdf, p.28 · Apollo-5KLP1G01-All-in-one-ESS-User-Guide.pdf, p.43
Battery 1 relay open circuit fault — Battery 1 relay not closing properly causing open circuit, shutdown and restart.
Cause: A safety relay inside the inverter has failed self-test or is stuck. The inverter is designed to refuse grid connection in this state, so this is not an issue you can clear with restart cycles.
Source: T-REX-50KHP3G01-user-manual-.pdf, p.46
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.