What is the F28 error on Felicity?

F28 on a Felicity unit means: The DC component of the inverter current is abnormal.. 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 F28 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 F28 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.

Critical

F28

Q: What does F28 mean on Apollo-5KLP1G01-MX?

The DC component of the inverter current is abnormal. Cause: The DC component of the inverter current is abnormal. Recommended fix: Restart the unit, if the error persists, contact the repair center.

Q: What does F28 mean on IVEM 6048?

Fault: Single unit is installed to parallel system. Cause: A single unit configuration was installed where parallel was expected. Recommended fix: 1. Please check if single unit is installed to parallel system. 2. if this error happens during parallel installation, please check wires connectiotn. if they are connected correctly, please funish parallel installation first, and then restart inverters. 3. if the problem remains, please contact your installer.

Q: What does F28 mean on IVEM8048-II?

Fault: Single unit is installed to parallel system. Cause: A single unit is detected as installed in a parallel system. Recommended fix: 1. Please check if single unit is installed to parallel system. 2. if this error happens during parallel installation, please check wires connectiotn. if they are connected correctly, please funish parallel installation first, and then restart inverters. 3. if the problem remains, please contact your installer.

Q: What does F28 mean on IVEM8048-LV?

Single unit is installed to parallel system. Cause: Single unit configured into a parallel system, or wiring problem during parallel installation. Recommended fix: 1. Please check if single unit is installed to parallel system. 2. if this error happens during parallel installation, please check wires connection. if they are connected correctly, please funish parallel installation first, and then restart inverters. 3. if the problem remains, please contact your installer.

The DC component of the inverter current is abnormal.

7 Devices that report this code

What does the F28 error code mean?

F28 on a Felicity unit indicates: The DC component of the inverter current is abnormal.. 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

F28 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

F28The DC component of the inverter current is abnormal.Critical

Description

The DC component of the inverter current is abnormal.

Cause

The DC component of the inverter current is abnormal.

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

F28Single unit is installed to parallel system.Fault

Description

Fault: Single unit is installed to parallel system.

Cause

A single unit configuration was installed where parallel was expected.

Recommended fix

1. Please check if single unit is installed to parallel system. 2. if this error happens during parallel installation, please check wires connectiotn. if they are connected correctly, please funish parallel installation first, and then restart inverters. 3. if the problem remains, please contact your installer.

Source:felicitysolar IVEM 6048 Solar Inverter User Guide.pdf · page 38

IVEM8048-IIInverter↗ view on device

F28Single unit is installed to parallel system.Fault

Description

Fault: Single unit is installed to parallel system.

Cause

A single unit is detected as installed in a parallel system.

Recommended fix

Source:IVEM8K-12K-II_compressed.pdf · page 44

IVEM8048-LVInverter↗ view on device

F28Single unit is installed to parallel system.Fault

Description

Single unit is installed to parallel system.

Cause

Single unit configured into a parallel system, or wiring problem during parallel installation.

Recommended fix

1. Please check if single unit is installed to parallel system. 2. if this error happens during parallel installation, please check wires connection. if they are connected correctly, please funish parallel installation first, and then restart inverters. 3. if the problem remains, please contact your installer.

Source:FelicitySolar IVEM8048-LV Single Phase Hybrid Inverter User Guide.pdf · page 39

T-REX-10KHP3G01Inverter↗ view on device

F28The DC component of the inverter current is abnormal.Fault

Description

Abnormal DC component detected in inverter current.

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

F28The DC component of the inverter current is abnormal.Fault

Description

The DC component of the inverter current is abnormal.

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

F28Battery 1 relay short circuit fault.Fault

Description

Battery 1 relay not properly disconnected causing short circuit, shutdown and restart.

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

Frequently asked about F28

What is the F28 error on Felicity?: F28 on a Felicity unit means: The DC component of the inverter current is abnormal.. 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 F28 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 F28 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.