Bus voltage too high
Also displayed as F31 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
Bus voltage too high — Bus voltage is too high.
Cause: The internal DC bus voltage exceeded its safe limit: an AC surge on the input, or failed internal components.
Source: ICM.pdf, p.14
Also applies to:IVGM6KL-P1G1IVGM7K6L-P1G1IVGM8KL-P1G1
LLC over Current fault of hardware — LLC converter hardware over current fault.
Cause: The hardware protection on the LLC converter stage (the isolated DC link inside the inverter) tripped on overcurrent.
Source: Felicitysolar IVGM Series Hybrid inverter Instruction Manual.pdf, p.53
Also applies to:T-REX-3K6LP1G01T-REX-4KLP1G01T-REX-4K6LP1G01T-REX-5KLP1G01T-REX-6KLP1G01
Bus voltage is too high — AC Surge or internal components failed. Bus voltage is too high.
Cause: An AC surge or failed internal components pushed the internal DC bus above its protection ceiling.
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:IVEM6048IVEM8048-IIIVEM12048-IIIVEM 8K-12K Series IIIVEM8048-LVIVEM8048
Over temperature happen at convert H circuit
Cause: The temperature of internal convert H component is over the limitation.
Check whether the air flow of the unit is blocked or whether the ambient temperature is too high.
Source: felicitysolar IVEM 6048 Solar Inverter User Guide.pdf, p.38 · IVEM8K-12K-II_compressed.pdf, p.44 · FelicitySolar IVEM8048-LV Single Phase Hybrid Inverter User Guide.pdf, p.39
Bus voltage is too high — DC bus voltage exceeds permitted level.
Cause: AC Surge or internal components failed.
Restart the unit, if the error persists, contact the repair center.
Source: T-REX-10KHP3G01-Inverter-User-Guide.pdf, p.29
Also applies to:Apollo-5KLP1G01-MXApollo-5KLP1G01-M1Apollo-5KLP1G01-M2Apollo-4K6LP1G01-MXApollo-4K6LP1G01-M1Apollo-4K6LP1G01-M2
Bus voltage is too high
Cause: AC Surge or 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 2 soft start fault — Battery 2 fails to raise the input voltage normally, shutdown and restart.
Cause: Battery 2's input stage failed to raise its voltage to the working point during the soft-start ramp — an internal converter fault on that channel.
Source: T-REX-50KHP3G01-user-manual-.pdf, p.46
All IVEM 6048 codes All IVEM8048-II codes All IVEM8048-LV codes
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.