Critical

F26

Invert soft start failed.

7 Devices that report this code

What does the F26 error code mean?

F26 on a Felicity unit indicates: Invert soft start failed.. It is a critical-severity event that can appear on 7 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 critical-severity code

Critical codes trip the unit offline immediately. They typically indicate hardware failure (short-circuit, IGBT, BMS) or an unsafe operating condition. Do not bypass the fault — note the code and contact authorized service.

What triggers this code

F26 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.

Apollo-5KLP1G01-MXEnergy storage system↗ view on device
F26Invert soft start failed.Critical
Description

Invert soft start failed; internal components failed.

Cause

Internal components failed.

Recommended fix

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

Source:Apollo-5KLP1G01-All-in-one-ESS-User-Guide.pdf · page 43
IVEM 6048Inverter↗ view on device
F26Sharing current sensor failed.Fault
Description

Fault: Sharing current sensor failed.

Cause

Sharing current sensor hardware failure (parallel operation).

Recommended fix

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

Source:felicitysolar IVEM 6048 Solar Inverter User Guide.pdf · page 37
IVEM8048-IIInverter↗ view on device
F26Sharing current sensor failed.Fault
Description

Fault: Sharing current sensor failed.

Cause

Current-sharing sensor failure (parallel system).

Recommended fix

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

Source:IVEM8K-12K-II_compressed.pdf · page 44
IVEM8048-LVInverter↗ view on device
F26Sharing current sensor failed.Fault
Description

Sharing current sensor 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 38
T-REX-10KHP3G01Inverter↗ view on device
F26Invert soft start failed.Fault
Description

Inverter soft start procedure failed.

Cause

Internal components failed.

Recommended fix

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

Source:T-REX-10KHP3G01-Inverter-User-Guide.pdf · page 28
T-REX-10KLP3G01Inverter↗ view on device
F26Invert soft start failed.Critical
Description

Inverter soft start failed.

Cause

Internal components failed.

Recommended fix

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

Source:T-REX-10KLP3G01-Inverter-User-Guide.pdf · page 28
T-REX-50KHP3G01Inverter↗ view on device
F26Battery 1 relay open circuit fault.Fault
Description

Battery 1 relay not closing properly causing open circuit, shutdown and restart.

Source:T-REX-50KHP3G01-user-manual-.pdf · page 46

Frequently asked about F26

What is the F26 error on Felicity?
F26 on a Felicity unit means: Invert soft start failed.. It can appear on 7 different devices in the Felicity catalog. The cause and recommended fix are listed for each device on this page.
Can I clear the F26 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 F26 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.