Fault

F03

Bus soft start fail.

4 Devices that report this code

What does the F03 error code mean?

F03 on a Felicity unit indicates: Bus soft start fail.. It is a fault-severity event that can appear on 4 different devices in the Felicity catalog. The same code may have slightly different recommended fixes depending on the device — the per-device sections below show the exact wording from each device's official manual.

This is a fault-severity code

Fault codes stop normal operation but the unit may attempt to recover. Common causes are out-of-range conditions (voltage, current, temperature) that require checking inputs and outputs before restart.

What triggers this code

F03 is triggered when the unit's protection or monitoring logic detects the specific condition described above. The exact trigger depends on the device — see the per-device sections for the official manual entry for each.

IVEM 6048Inverter↗ view on device
F03Bus soft start fail.Fault
Description

Fault: Bus soft start fail.

Cause

Internal components failed.

Recommended fix

Restart the unit, if the error persists, contact the repair center.

Source:felicitysolar IVEM 6048 Solar Inverter User Guide.pdf · page 36
IVEM8048-IIInverter↗ view on device
F03Bus soft start fail.Fault
Description

Fault: Bus soft start fail.

Cause

Internal components failed.

Recommended fix

Restart the unit, if the error persists, contact the repair center.

Source:IVEM8K-12K-II_compressed.pdf · page 43
IVEM8048-LVInverter↗ view on device
F03Bus soft start fail.Fault
Description

Bus soft start fail.

Cause

Internal components failed.

Recommended fix

Restart the unit, if the error persists, contact the repair center.

Source:FelicitySolar IVEM8048-LV Single Phase Hybrid Inverter User Guide.pdf · page 37
T-REX-50KHP3G01Inverter↗ view on device
F03PV3 overvoltage fault.Fault
Description

The voltage of the PV3 is too high, check the voltage of the string.

Source:T-REX-50KHP3G01-user-manual-.pdf · page 45

Frequently asked about F03

What is the F03 error on Felicity?
F03 on a Felicity unit means: Bus soft start fail.. It can appear on 4 different devices in the Felicity catalog. The cause and recommended fix are listed for each device on this page.
Can I clear the F03 code myself?
It depends on the severity. Warning-level codes can usually be cleared by following the recommended fix. Fault and critical codes often require checking the source condition first; if the code returns immediately after restart, escalate to authorized service.
Is the F03 fix the same on every device?
The cause is consistent — it's the same protection logic. The exact fix wording can differ per device because each official manual addresses model-specific context (input ranges, parallel-config notes, firmware revisions). Use the per-device section that matches your unit.
Where does this information come from?
Every entry is sourced directly from the official Felicity user manual for the affected device. The "Source" line at the bottom of each device's section shows the manual filename and page number.

Compiled from official Felicity user manuals. Always consult your device manual and a qualified technician before performing repairs.