Critical

F11

Over current happen at Buckboost.

7 Devices that report this code

What does the F11 error code mean?

F11 on a Felicity unit indicates: Over current happen at Buckboost.. 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

F11 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
F11Over current happen at Buckboost.Critical
Description

Over current detected at the Buckboost stage.

Cause

Over current at Buckboost.

Recommended fix

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

Source:Apollo-5KLP1G01-All-in-one-ESS-User-Guide.pdf · page 42
IVEM 6048Inverter↗ view on device
F11Battery voltage is too high.Fault
Description

Fault: Battery voltage is too high.

Cause

Battery spec/quantity does not meet inverter requirements.

Recommended fix

Check if spec and quantity of batteries are meet requirements.

Source:felicitysolar IVEM 6048 Solar Inverter User Guide.pdf · page 37
IVEM8048-IIInverter↗ view on device
F11Battery voltage is too high.Fault
Description

Fault: Battery voltage is too high.

Cause

Battery voltage exceeds the inverter's allowed maximum.

Recommended fix

Check if spec and quantity of batteries are meet requirements.

Source:IVEM8K-12K-II_compressed.pdf · page 43
IVEM8048-LVInverter↗ view on device
F11Battery voltage is too high.Fault
Description

Battery voltage is too high.

Cause

Battery spec or quantity does not meet requirements.

Recommended fix

Check if spec and quantity of batteries are meet requirements.

Source:FelicitySolar IVEM8048-LV Single Phase Hybrid Inverter User Guide.pdf · page 38
T-REX-10KHP3G01Inverter↗ view on device
F11Over current happen at Buckboost.Fault
Description

Over current detected at Buckboost stage.

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
F11Over current happen at Buckboost.Fault
Description

Over current happen at Buckboost.

Recommended fix

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

Source:T-REX-10KLP3G01-Inverter-User-Guide.pdf · page 27
T-REX-50KHP3G01Inverter↗ view on device
F11PV3 reverse connection fault.Fault
Description

Pv3 string positive and negative connection, check the string wiring.

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

Frequently asked about F11

What is the F11 error on Felicity?
F11 on a Felicity unit means: Over current happen at Buckboost.. 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 F11 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 F11 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.